Wrapper for midband frequency of standard filter

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lasprs"
-version = "0.6.1"
+version = "0.6.2"
 edition = "2021"
 authors = ["J.A. de Jong <j.a.dejong@ascee.nl>"]
 description = "Library for Acoustic Signal Processing (Rust edition, with optional Python bindings via pyo3)"

README.md

@@ -12,12 +12,17 @@ and processing of (multi) sensor data in real time on a PC and output results.
 
 Documentation is provided at [doc.rs](https://docs.rs/lasprs/latest/lasprs).
 
-
 ## Python bindings and examples
 
 The library has Python bindings (via [pyo3](https://pyo3.rs), which can be installed via:
 
 ```
-$ pip install git+https://code.ascee.nl/ascee/lasprs --install-option "python-bindings"
+$ pip install lasprs
 ```
 
+which pulls the library from [Pypi](https://pypi.org).
+
+Examples of how to use the library are provided in Jupyter Notebooks, which  can be found in the repository, see [lasprs/examples_py](https://code.ascee.nl/ASCEE/lasprs/src/branch/main/examples_py).
+
+More examples will follow in the near future.
+

examples_py/test_aps.ipynb

@@ -0,0 +1,146 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "6763c6d0-878f-4492-840e-40d11a52f91e",
+   "metadata": {},
+   "source": [
+    "# Test Welch method implementation Python wrappers"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "6c06a0c3-dcf7-4d21-b1f3-eced84e31218",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "🍹 Building a mixed python/rust project\n",
+      "🔗 Found pyo3 bindings\n",
+      "🐍 Found CPython 3.10 at /home/anne/.pyenv/versions/lasprs/bin/python\n",
+      "Requirement already satisfied: numpy in /home/anne/.pyenv/versions/lasprs/lib/python3.10/site-packages (1.26.4)\n",
+      "\u001b[1m\u001b[32m   Compiling\u001b[0m pyo3-build-config v0.21.2\n",
+      "\u001b[K\u001b[1m\u001b[32m   Compiling\u001b[0m pyo3-macros-backend v0.21.2 178/189: pyo3-build-config           \n",
+      "\u001b[K\u001b[1m\u001b[32m   Compiling\u001b[0m pyo3-ffi v0.21.2=======>  ] 178/189: pyo3-macros-backend, pyo3...\n",
+      "\u001b[1m\u001b[32m   Compiling\u001b[0m pyo3 v0.21.2\n",
+      "\u001b[K\u001b[1m\u001b[32m   Compiling\u001b[0m pyo3-macros v0.21.2=====> ] 183/189: pyo3-macros-backend, pyo3...\n",
+      "\u001b[K\u001b[1m\u001b[32m   Compiling\u001b[0m numpy v0.21.0===========> ] 186/189: pyo3                        \n",
+      "\u001b[K\u001b[1m\u001b[32m   Compiling\u001b[0m lasprs v0.6.1 (/home/anne/wip/mycode/lasprs)                     \n",
+      "\u001b[K\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: type alias `Vc` is never used\u001b[0m                     \n",
+      "\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/config.rs:63:10\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m63\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0mpub type Vc = Vec<Cflt>;\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m          \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mnote\u001b[0m\u001b[0m: `#[warn(dead_code)]` on by default\u001b[0m\n",
+      "\n",
+      "\u001b[K\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: type alias `Cmat` is never used\u001b[0m                   \n",
+      "\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/config.rs:75:10\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m75\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0mpub type Cmat = Array2<Cflt>;\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m          \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^\u001b[0m\n",
+      "\n",
+      "\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: methods `ninchannels` and `noutchannels` are never used\u001b[0m\n",
+      "\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/daq/api/mod.rs:25:8\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m20\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0mpub trait Stream {\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m           \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m------\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12mmethods in this trait\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m...\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m25\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m    fn ninchannels(&self) -> usize;\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m        \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m...\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m28\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m    fn noutchannels(&self) -> usize;\u001b[0m\n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m        \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^^\u001b[0m\n",
+      "\n",
+      "\u001b[K\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: method `setPreFilter` is never used\u001b[0m               \n",
+      "\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/siggen.rs:320:12\u001b[0m\n",
+      "\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m318\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0mimpl SiggenChannelConfig {\u001b[0m\n",
+      "\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m------------------------\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12mmethod in this implementation\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m319\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m    /// Set new pre-filter that filters the source signal\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[38;5;12m320\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m    pub fn setPreFilter(&mut self, pref: Option<Box<dyn Filter>>) {\u001b[0m\n",
+      "\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m            \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^^\u001b[0m\n",
+      "\n",
+      "\u001b[K\u001b[1m\u001b[33mwarning\u001b[0m\u001b[1m:\u001b[0m `lasprs` (lib) generated 4 warningssprs                      \n",
+      "\u001b[1m\u001b[32m    Finished\u001b[0m \u001b]8;;https://doc.rust-lang.org/cargo/reference/profiles.html#default-profiles\u001b\\`dev` profile [unoptimized + debuginfo]\u001b]8;;\u001b\\ target(s) in 6.04s\n",
+      "📦 Built wheel for CPython 3.10 to /tmp/.tmp03vGw7/lasprs-0.6.1-cp310-cp310-linux_x86_64.whl\n",
+      "✏️  Setting installed package as editable\n",
+      "🛠 Installed lasprs-0.6.1\n"
+     ]
+    }
+   ],
+   "source": [
+    "!cd .. && maturin develop -F python-bindings"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "3e651371-e7a5-4013-a265-ab80f8b1eb41",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from lasprs import WindowType"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "9d6bdf3b-40f8-4c3b-85ac-4ff8b8c7dcae",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "w = WindowType.all()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "3a31899d-37de-4653-9b6e-61dcf7c683f4",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[WindowType.Hann,\n",
+       " WindowType.Hamming,\n",
+       " WindowType.Rect,\n",
+       " WindowType.Bartlett,\n",
+       " WindowType.Blackman]"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "w"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.12"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}

examples_py/test_filterbank.ipynb

@@ -41,8 +41,8 @@
    "source": [
     "import numpy as np\n",
     "import matplotlib.pyplot as plt\n",
-    "from numpy import log10, sqrt, exp, pi\n",
+    "from numpy import log10\n",
-    "from lasprs._lasprs import StandardFilterDescriptor, SLMSettings, FreqWeighting, TimeWeighting, SLM\n",
+    "from lasprs import StandardFilterDescriptor\n",
     "def level(a):\n",
     "    return 20*np.log10(np.abs(a))"
    ]

examples_py/test_freqweighting.ipynb

@@ -41,8 +41,8 @@
    "source": [
     "import numpy as np\n",
     "import matplotlib.pyplot as plt\n",
-    "from numpy import log10, sqrt, exp, pi\n",
+    "from numpy import log10\n",
-    "from lasprs._lasprs import ZPKModel, FreqWeighting\n",
+    "from lasprs import ZPKModel, FreqWeighting\n",
     "def level(a):\n",
     "    return 20*np.log10(np.abs(a))"
    ]

examples_py/test_slm1.ipynb

@@ -17,6 +17,7 @@
    "source": [
     "# Prerequisites, uncomment below in case of errors. Also for ipympl, restart Jupyter Lab if it was not installed\n",
     "\n",
+    "# Only do the following if you are in develop mode\n",
     "!cd .. && maturin develop -F python-bindings\n",
     "#!pip install ipympl scipy matplotlib"
    ]
@@ -41,7 +42,7 @@
    "source": [
     "import numpy as np\n",
     "import matplotlib.pyplot as plt\n",
-    "from numpy import log10, sqrt, exp, pi\n",
+    "from numpy import log10\n",
     "from lasprs._lasprs import StandardFilterDescriptor, SLMSettings, FreqWeighting, TimeWeighting, SLM\n",
     "def level(a):\n",
     "    return 20*np.log10(np.abs(a))"
@@ -105,27 +106,7 @@
    "outputs": [],
    "source": [
     "t = np.linspace(0, N/fs, N, endpoint=False)\n",
-    "out = slm.run(inp)"
+    "out = slm.run(inp, True)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "37af9b78-73b9-4228-a758-d9a5362f79f4",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "len(out[0])"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "4609a63f-e350-4b6b-b898-93c9e6fef804",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "# help(plt.legend)"
    ]
   },
   {
@@ -141,14 +122,6 @@
     "plt.ylim(-60, 0)\n",
     "plt.legend(names)"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "4303e20e-cc61-4d23-a5f0-cab683d55912",
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {

python/lasprs/filter/__init__.py

@@ -1 +0,0 @@
-from .._lasprs import (Biquad, BiquadBank, SeriesBiquad, ZPKModel, FilterSpec)

src/config.rs

@@ -11,7 +11,7 @@ cfg_if::cfg_if! {
         /// Ratio between circumference and diameter of a circle
         pub const pi: Flt = std::f64::consts::PI;
 
-        
+
     }
     else if #[cfg(feature="f32")] {
         /// Floating-point value, compile time option to make it either f32, or f64
@@ -26,7 +26,8 @@ cfg_if::cfg_if! {
 
 cfg_if::cfg_if! {
 if #[cfg(feature = "python-bindings")] {
-    pub use numpy::{IntoPyArray,PyArray, PyArray1, PyArrayDyn, PyArrayLike1, PyReadonlyArrayDyn};
+    pub use numpy::{IntoPyArray,PyArray, PyArray1, PyArray2, PyArray3, PyArrayDyn, PyArrayLike1,
+        PyArrayLike2,PyArrayLike3,PyReadonlyArrayDyn, convert::ToPyArray};
     pub use pyo3::prelude::*;
     pub use pyo3::exceptions::PyValueError;
     pub use pyo3::{pymodule, types::PyModule, PyResult};

src/filter/octave.rs

@@ -1,5 +1,5 @@
 use crate::{config::*, ZPKModel};
-use anyhow::{anyhow, bail, Result};
+use anyhow::{anyhow, bail, Error, Result};
 use num::{traits::float, Float};
 use rayon::iter::Filter;
 use softfloat::F64;
@@ -497,6 +497,38 @@ impl StandardFilterDescriptor {
         Ok(Self::genThirdOctaveFilterSet(fmin, fmax)?)
     }
 
+    #[staticmethod]
+    #[pyo3(name = "genFilterSetInRangeWithStartStopDescriptors")]
+    fn genFilterSet_range(
+        start: StandardFilterDescriptor,
+        stop: StandardFilterDescriptor,
+        include_overall: bool,
+    ) -> PyResult<Vec<StandardFilterDescriptor>> {
+        if start.b == 0 {
+            return Err(PyValueError::new_err(
+                "Overall band designator cannot be used to define range",
+            ));
+        }
+        if start.b != stop.b {
+            return Err(PyValueError::new_err(
+                "Start and stop filter are not of same type",
+            ));
+        }
+        if start.x > stop.x {
+            return Err(PyValueError::new_err(
+                "Start filter has higher midband frequency than stop frequency",
+            ));
+        }
+
+        let mut res = (start.x..=stop.x)
+            .map(|x| StandardFilterDescriptor { b: start.b, x: x })
+            .collect::<Vec<StandardFilterDescriptor>>();
+        if include_overall {
+            res.push(StandardFilterDescriptor::Overall().expect("Overall should not err"))
+        }
+        Ok(res)
+    }
+
     #[staticmethod]
     #[pyo3(name = "genOctaveFilterSet")]
     fn genOctaveFilterSetFromFreq(fmin: Flt, fmax: Flt) -> PyResult<Vec<StandardFilterDescriptor>> {
@@ -527,8 +559,18 @@ impl StandardFilterDescriptor {
         fmax: Flt,
         append_overall: bool,
     ) -> PyResult<Vec<StandardFilterDescriptor>> {
+        if b == 0 {
+            return Err(PyValueError::new_err(
+                "Overall band designator cannot be used to define range",
+            ));
+        }
         Ok(Self::genFilterSetForRange(b, fmin, fmax, append_overall)?)
     }
+
+    #[pyo3(name="fm")]
+    fn fm_py(&self) -> Option<Flt> {
+        self.fm()
+    }
 }
 
 #[cfg(test)]

src/filter/zpkmodel.rs

@@ -569,7 +569,6 @@ impl ZPKModel {
         let p2 = 2. * pi * f2;
         let p3 = 2. * pi * f3;
         let p4 = 2. * pi * f4;
-        println!("{b} {p1}, {p2}, {p3}, {p4}");
 
         let (zeros, poles) = match wt {
             FreqWeighting::Z => {
@@ -610,11 +609,21 @@ pub enum PoleOrZero {
 
 #[cfg(test)]
 mod test{
+    use approx::assert_abs_diff_eq;
+    use num::complex::ComplexFloat;
+
+    use crate::TransferFunction;
     use super::ZPKModel;
 
 
     #[test]
     fn test_A() {
         let Aw = ZPKModel::freqWeightingFilter(crate::FreqWeighting::A);
+        assert_abs_diff_eq!(Aw.tf(0., &[1000.])[0].abs(), 1.0);
+    }
+    #[test]
+    fn test_C() {
+        let Cw = ZPKModel::freqWeightingFilter(crate::FreqWeighting::C);
+        assert_abs_diff_eq!(Cw.tf(0., &[1000.])[0].abs(), 1.0);
     }
 }

src/lib.rs

@@ -62,6 +62,12 @@ fn lasprs(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_class::<ps::FreqWeighting>()?;
     m.add_class::<slm::SLMSettings>()?;
     m.add_class::<slm::SLM>()?;
+    m.add_class::<slm::TimeWeighting>()?;
+    m.add_class::<ps::WindowType>()?;
+    m.add_class::<ps::Overlap>()?;
+    m.add_class::<ps::ApsMode>()?;
+    m.add_class::<ps::ApsSettings>()?;
+    m.add_class::<ps::AvPowerSpectra>()?;
 
     Ok(())
 }

src/ps/aps.rs

@@ -1,214 +1,25 @@
-use super::timebuffer::TimeBuffer;
-use super::CrossPowerSpecra;
 use super::*;
-use crate::config::*;
+use super::{timebuffer::TimeBuffer, CrossPowerSpecra};
+use crate::{config::*, TransferFunction, ZPKModel};
 use anyhow::{bail, Error, Result};
-use derive_builder::Builder;
 use freqweighting::FreqWeighting;
 
-/// All settings used for computing averaged power spectra using Welch' method.
-#[derive(Builder, Clone)]
-#[builder(build_fn(validate = "Self::validate", error = "Error"))]
-pub struct ApsSettings {
-    /// Mode of computation, see [ApsMode].
-    #[builder(default)]
-    mode: ApsMode,
-    /// Overlap in time segments. See [Overlap].
-    #[builder(default)]
-    overlap: Overlap,
-    /// Window applied to time segments. See [WindowType].
-    #[builder(default)]
-    windowType: WindowType,
-    /// Kind of freqency weighting. Defaults to Z
-    #[builder(default)]
-    freqWeightingType: FreqWeighting,
-    /// FFT Length
-    nfft: usize,
-    /// Sampling frequency
-    fs: Flt,
-}
-
-impl ApsSettingsBuilder {
-    fn validate(&self) -> Result<()> {
-        if !self.fs.is_some() {
-            bail!("Sampling frequency not given");
-        }
-        let fs = self.fs.unwrap();
-
-        if !fs.is_normal() {
-            bail!("Sampling frequency not a normal number")
-        }
-        if fs <= 0.0 {
-            bail!("Invalid sampling frequency given as parameter");
-        }
-
-        if self.nfft.is_none() {
-            bail!("nfft not specified")
-        };
-        let nfft = self.nfft.unwrap();
-        if nfft % 2 != 0 {
-            bail!("NFFT should be even")
-        }
-        if nfft == 0 {
-            bail!("Invalid NFFT, should be > 0.")
-        }
-        // Perform some checks on ApsMode
-        if let Some(ApsMode::ExponentialWeighting { tau }) = self.mode {
-            if tau <= 0.0 {
-                bail!("Invalid time weighting constant [s]. Should be > 0 if given.");
-            }
-        }
-
-        Ok(())
-    }
-}
-impl ApsSettings {
-    /// Returns nfft
-    pub fn nfft(&self) -> usize {
-        self.nfft
-    }
-    fn get_overlap_keep(&self) -> usize {
-        self.validate_get_overlap_keep().unwrap()
-    }
-    /// Unpack all, returns parts in tuple
-    pub fn get(self) -> (ApsMode, Overlap, WindowType, FreqWeighting, usize, Flt) {
-        (
-            self.mode,
-            self.overlap,
-            self.windowType,
-            self.freqWeightingType,
-            self.nfft,
-            self.fs,
-        )
-    }
-    /// Returns the amount of samples to `keep` in the time buffer when
-    /// overlapping time segments using [TimeBuffer].
-    pub fn validate_get_overlap_keep(&self) -> Result<usize> {
-        let nfft = self.nfft;
-        let overlap_keep = match self.overlap {
-            Overlap::Number(i) if i >= nfft => {
-                bail!("Invalid overlap number of samples. Should be < nfft, which is {nfft}.")
-            }
-            // Keep 1 sample, if overlap is 1 sample etc.
-            Overlap::Number(i) if i < nfft => i,
-
-            // If overlap percentage is >= 100, or < 0.0 its an error
-            Overlap::Percentage(p) if !(0.0..100.).contains(&p) => {
-                bail!("Invalid overlap percentage. Should be >= 0. And < 100.")
-            }
-            // If overlap percentage is 0, this gives
-            Overlap::Percentage(p) => ((p * nfft as Flt) / 100.) as usize,
-            Overlap::NoOverlap => 0,
-            _ => unreachable!(),
-        };
-        if overlap_keep >= nfft {
-            bail!("Computed overlap results in invalid number of overlap samples. Please make sure the FFT length is large enough, when high overlap percentages are required.");
-        }
-        Ok(overlap_keep)
-    }
-
-    /// Return a reasonable acoustic default with a frequency resolution around
-    /// ~ 10 Hz, where nfft is still an integer power of 2.
-    ///
-    /// # Errors
-    ///
-    /// If `fs` is something odd, i.e. < 1 kHz, or higher than 1 MHz.
-    ///
-    pub fn reasonableAcousticDefault(fs: Flt, mode: ApsMode) -> Result<ApsSettings> {
-        if fs < 1e3 || fs > 1e6 {
-            bail!("Sampling frequency for reasonable acoustic data is >= 1 kHz and <= 1 MHz.");
-        }
-        let fs_div_10_rounded = (fs / 10.) as u32;
-
-        // 2^30 is about 1 million. We search for a two-power of an nfft that is
-        // the closest to fs/10. The frequency resolution is about fs/nfft.
-        let nfft = (0..30).map(|i| 2u32.pow(i) - fs_div_10_rounded).fold(
-            // Start wth a value that is always too large
-            fs as u32 * 10,
-            |cur, new| cur.min(new),
-        ) as usize;
-
-        Ok(ApsSettings {
-            mode,
-            fs,
-            nfft,
-            windowType: WindowType::default(),
-            overlap: Overlap::default(),
-            freqWeightingType: FreqWeighting::default(),
-        })
-    }
-
-    /// Return sampling frequency
-    pub fn fs(&self) -> Flt {
-        self.fs
-    }
-
-    /// Return Nyquist frequency
-    pub fn fnyq(&self) -> Flt {
-        self.fs() / 2.
-    }
-
-    /// Returns a single-sided frequency array corresponding to points in Power
-    /// spectra computation.
-    pub fn getFreq(&self) -> Array1<Flt> {
-        let df = self.fs / self.nfft as Flt;
-        let K = self.nfft / 2 + 1;
-        Array1::linspace(0., (K - 1) as Flt * df, K)
-    }
-}
-
-///  Provide the overlap of blocks for computing averaged (cross) power spectra.
-///  Can be provided as a percentage of the block size, or as a number of
-///  samples.
-#[derive(Clone, Debug)]
-pub enum Overlap {
-    /// Overlap specified as a percentage of the total FFT length. Value should
-    /// be 0<=pct<100.
-    Percentage(Flt),
-    /// Number of samples to overlap
-    Number(usize),
-    /// No overlap at all, which is the same as Overlap::Number(0)
-    NoOverlap,
-}
-impl Default for Overlap {
-    fn default() -> Self {
-        Overlap::Percentage(50.)
-    }
-}
-
-/// The 'mode' used in computing averaged power spectra. When providing data in
-/// blocks to the [AvPowerSpectra] the resulting 'current estimate' responds
-/// differently, depending on the model.
-#[derive(Default, Copy, Clone)]
-pub enum ApsMode {
-    /// Averaged over all data provided. New averages can be created by calling
-    /// `AvPowerSpectra::reset()`
-    #[default]
-    AllAveraging,
-    /// In this mode, the `AvPowerSpectra` works a bit like a sound level meter,
-    /// where new data is weighted with old data, and old data exponentially
-    /// backs off. This mode only makes sense when `tau >> nfft/fs`
-    ExponentialWeighting {
-        /// Time weighting constant, follows convention of Sound Level Meters.
-        /// Means the data is approximately low-pass filtered with a cut-off
-        /// frequency f_c of s/tau ≅ 1 → f_c = (2 * pi * tau)^-1.
-        tau: Flt,
-    },
-    /// Spectrogram mode. Only returns the latest estimate(s).
-    Spectrogram,
-}
-
 /// Averaged power spectra computing engine
 /// Used to compute power spectra estimations on
 /// long datasets, where nfft << length of data. This way, the variance of a
 /// single periodogram is suppressed with increasing number of averages.
 ///
 /// For more information, see the book on numerical recipes.
-///
+
+#[cfg(feature = "python-bindings")]
+#[cfg_attr(feature = "python-bindings", pyclass)]
+#[derive(Debug)]
+
 pub struct AvPowerSpectra {
     // Power spectra estimator for single block
     ps: PowerSpectra,
 
+    // Settings for computing power spectra, see [ApsSettings]
     settings: ApsSettings,
 
     // The number of samples to keep in the time buffer when overlapping time
@@ -221,6 +32,11 @@ pub struct AvPowerSpectra {
     /// Storage for sample data.
     timebuf: TimeBuffer,
 
+    /// Power scaling for of applied frequency weighting. Multiply each power
+    /// and cross-power value with these constants to apply the frequency
+    /// weighting.
+    freqWeighting_pwr: Option<Dcol>,
+
     // Current estimation of the power spectra
     cur_est: CPSResult,
 }
@@ -254,8 +70,7 @@ impl AvPowerSpectra {
     /// - When providing invalid sampling frequencies
     ///
     pub fn new_simple_all_averaging(fs: Flt, nfft: usize) -> AvPowerSpectra {
-        let mut settings =
+        let mut settings = ApsSettings::reasonableAcousticDefault(fs, ApsMode::default()).unwrap();
-            ApsSettings::reasonableAcousticDefault(fs, ApsMode::AllAveraging).unwrap();
         settings.nfft = nfft;
         AvPowerSpectra::new(settings)
     }
@@ -285,19 +100,51 @@ impl AvPowerSpectra {
 
         let ps = PowerSpectra::newFromWindow(window);
 
+        let freq = settings.getFreq();
+        let freqWeighting_pwr = match settings.freqWeightingType {
+            FreqWeighting::Z => None,
+            _ => {
+                let fw_pwr = ZPKModel::freqWeightingFilter(settings.freqWeightingType)
+                    .tf(0., &freq)
+                    .mapv(|a| a.abs() * a.abs());
+                Some(fw_pwr)
+            }
+        };
+
         AvPowerSpectra {
             ps,
             overlap_keep,
             settings,
             N: 0,
+            freqWeighting_pwr,
             cur_est: CPSResult::default((0, 0, 0)),
             timebuf: TimeBuffer::new(),
         }
     }
     // Update result for single block
     fn update_singleblock(&mut self, timedata: ArrayView2<Flt>) {
-        let Cpsnew = self.ps.compute(timedata);
+        // Compute updated block of cross-spectral density
-        // println!("Cpsnew: {:?}", Cpsnew[[0, 0, 0]]);
+        let Cpsnew = {
+            let mut Cpsnew = self.ps.compute(timedata);
+            let dim = Cpsnew.dim();
+            if let Some(fw_pwr) = &self.freqWeighting_pwr {
+                // Frequency weighting on power is available, multiply all values with frequency weighting
+
+                // Option 1: azip with indexing
+                // azip!((index (i,_,_), cps in &mut Cpsnew) {
+                //     *cps = Cflt::new(cps.re * fw_pwr[[i]], cps.im * fw_pwr[[i]]);
+                // });
+
+                // Option 2: broadcasting with an unwrap.
+                let dview_fw = fw_pwr.slice(s![..,NewAxis, NewAxis]);
+                azip!((c in &mut Cpsnew, f in dview_fw.broadcast(dim).expect("BUG: Cannot broadcast")) {
+                    // Scale with frequency weighting
+                    *c = Cflt::new(c.re * f, c.im * f);
+                });
+            }
+
+            Cpsnew
+        };
 
         // Initialize to zero
         if self.cur_est.is_empty() {
@@ -310,7 +157,7 @@ impl AvPowerSpectra {
 
         // Apply operation based on mode
         match self.settings.mode {
-            ApsMode::AllAveraging => {
+            ApsMode::AllAveraging {} => {
                 let Nf = Cflt {
                     re: self.N as Flt,
                     im: 0.,
@@ -359,7 +206,7 @@ impl AvPowerSpectra {
                 }
             }
 
-            ApsMode::Spectrogram => {
+            ApsMode::Spectrogram {} => {
                 self.cur_est = Cpsnew;
             }
         }
@@ -395,9 +242,10 @@ impl AvPowerSpectra {
             computed_single = true;
         }
         if computed_single {
-            return Some(&self.cur_est);
+            Some(&self.cur_est)
+        } else {
+            None
         }
-        None
     }
 
     /// Computes average (cross)power spectra, and returns all intermediate
@@ -435,6 +283,29 @@ impl AvPowerSpectra {
     }
 }
 
+#[cfg(feature = "python-bindings")]
+#[cfg_attr(feature = "python-bindings", pymethods)]
+impl AvPowerSpectra {
+    #[new]
+    fn new_py(s: ApsSettings) -> AvPowerSpectra {
+        AvPowerSpectra::new(s)
+    }
+
+    #[pyo3(name = "compute")]
+    fn compute_py<'py>(
+        &mut self,
+        py: Python<'py>,
+        dat: PyArrayLike2<Flt>,
+    ) -> Bound<'py, PyArray3<Cflt>> {
+        let dat = dat.as_array();
+        if let Some(res) = self.compute_last(dat) {
+            let res = res.clone();
+            return res.to_pyarray_bound(py);
+        }
+        let res: Bound<'py, PyArray3<Cflt>> = PyArray3::zeros_bound(py, [0, 0, 0], true);
+        res
+    }
+}
 #[cfg(test)]
 mod test {
     use approx::assert_abs_diff_eq;
@@ -450,11 +321,11 @@ mod test {
     #[test]
     fn test_overlap_keep() {
         let ol = [
-            Overlap::NoOverlap,
+            Overlap::NoOverlap {},
-            Percentage(50.),
+            Percentage { pct: 50. },
-            Percentage(50.),
+            Percentage { pct: 50. },
-            Percentage(25.),
+            Percentage { pct: 25. },
-            Overlap::Number(10),
+            Overlap::Number { N: 10 },
         ];
         let nffts = [10, 10, 1024, 10];
         let expected_keep = [0, 5, 512, 2, 10];
@@ -465,7 +336,7 @@ mod test {
                 .fs(1.)
                 .overlap(overlap.clone())
                 .build()
-                .unwrap();
+                .expect("BUG: Settings cannot be build.");
 
             assert_eq!(settings.get_overlap_keep(), *expected);
         }
@@ -481,15 +352,15 @@ mod test {
         let settings = ApsSettingsBuilder::default()
             .fs(fs)
             .nfft(nfft)
-            .overlap(Overlap::NoOverlap)
+            .overlap(Overlap::NoOverlap {})
             .mode(ApsMode::ExponentialWeighting { tau })
             .build()
-            .unwrap();
+            .expect("Settings cannot be empty");
         let overlap_keep = settings.get_overlap_keep();
         let mut aps = AvPowerSpectra::new(settings);
         assert_eq!(aps.overlap_keep, 0);
 
-        let distr = Normal::new(1.0, 1.0).unwrap();
+        let distr = Normal::new(1.0, 1.0).expect("Distribution cannot be built");
         let timedata_some = Dmat::random((nfft, 1), distr);
         let timedata_zeros = Dmat::zeros((nfft, 1));
 

src/ps/apsmode.rs

@@ -0,0 +1,35 @@
+use crate::config::*;
+/// The 'mode' used in computing averaged power spectra. When providing data in
+/// blocks to the [AvPowerSpectra] the resulting 'current estimate' responds
+/// differently, depending on the model.
+#[derive(Copy, Clone, PartialEq, Debug)]
+#[cfg_attr(feature = "python-bindings", pyclass)]
+pub enum ApsMode {
+    /// Averaged over all data provided. New averages can be created by calling
+    /// `AvPowerSpectra::reset()`
+    AllAveraging {},
+    /// In this mode, the `AvPowerSpectra` works a bit like a sound level meter,
+    /// where new data is weighted with old data, and old data exponentially
+    /// backs off. This mode only makes sense when `tau >> nfft/fs`
+    ExponentialWeighting {
+        /// Time weighting constant, follows convention of Sound Level Meters.
+        /// Means the data is approximately low-pass filtered with a cut-off
+        /// frequency f_c of s/tau ≅ 1 → f_c = (2 * pi * tau)^-1.
+        tau: Flt,
+    },
+    /// Spectrogram mode. Only returns the latest estimate(s).
+    Spectrogram {},
+}
+impl Default for ApsMode {
+    fn default() -> Self {
+        ApsMode::AllAveraging {}
+    }
+}
+#[cfg(feature = "python-bindings")]
+#[cfg_attr(feature = "python-bindings", pymethods)]
+impl ApsMode {
+    #[inline]
+    fn __eq__(&self, other: &Self) -> bool {
+        self == other
+    }
+}

src/ps/apssettings.rs

@@ -0,0 +1,168 @@
+use super::*;
+use crate::config::*;
+use anyhow::{bail, Error, Result};
+use derive_builder::Builder;
+
+/// All settings used for computing averaged power spectra using Welch' method.
+#[derive(Builder, Clone, Debug)]
+#[cfg_attr(feature = "python-bindings", pyclass)]
+#[builder(build_fn(validate = "Self::validate", error = "Error"))]
+pub struct ApsSettings {
+    /// Mode of computation, see [ApsMode].
+    #[builder(default)]
+    pub mode: ApsMode,
+    /// Overlap in time segments. See [Overlap].
+    #[builder(default)]
+    pub overlap: Overlap,
+    /// Window applied to time segments. See [WindowType].
+    #[builder(default)]
+    pub windowType: WindowType,
+    /// Kind of freqency weighting. Defaults to Z
+    #[builder(default)]
+    pub freqWeightingType: FreqWeighting,
+    /// FFT Length
+    pub nfft: usize,
+    /// Sampling frequency
+    pub fs: Flt,
+}
+
+impl ApsSettingsBuilder {
+    fn validate(&self) -> Result<()> {
+        if !self.fs.is_some() {
+            bail!("Sampling frequency not given");
+        }
+        let fs = self.fs.unwrap();
+
+        if !fs.is_normal() {
+            bail!("Sampling frequency not a normal number")
+        }
+        if fs <= 0.0 {
+            bail!("Invalid sampling frequency given as parameter");
+        }
+
+        if self.nfft.is_none() {
+            bail!("nfft not specified")
+        };
+        let nfft = self.nfft.unwrap();
+        if nfft % 2 != 0 {
+            bail!("NFFT should be even")
+        }
+        if nfft == 0 {
+            bail!("Invalid NFFT, should be > 0.")
+        }
+        // Perform some checks on ApsMode
+        if let Some(ApsMode::ExponentialWeighting { tau }) = self.mode {
+            if tau <= 0.0 {
+                bail!("Invalid time weighting constant [s]. Should be > 0 if given.");
+            }
+        }
+
+        Ok(())
+    }
+}
+
+#[cfg(feature = "python-bindings")]
+#[cfg_attr(feature = "python-bindings", pymethods)]
+impl ApsSettings {
+    #[new]
+    fn new(
+        mode: ApsMode,
+        overlap: Overlap,
+        windowType: WindowType,
+        freqWeightingType: FreqWeighting,
+        nfft: usize,
+        fs: Flt,
+    ) -> ApsSettings {
+        ApsSettings {
+            mode,
+            overlap,
+            windowType,
+            freqWeightingType,
+            nfft,
+            fs,
+        }
+    }
+}
+
+impl ApsSettings {
+    /// Returns the amount of samples to keep in overlapping blocks of power
+    /// spectra.
+    pub fn get_overlap_keep(&self) -> usize {
+        self.validate_get_overlap_keep().unwrap()
+    }
+
+    /// Returns the amount of samples to `keep` in the time buffer when
+    /// overlapping time segments using [TimeBuffer].
+    fn validate_get_overlap_keep(&self) -> Result<usize> {
+        let nfft = self.nfft;
+        let overlap_keep = match self.overlap {
+            Overlap::Number { N } if N >= nfft => {
+                bail!("Invalid overlap number of samples. Should be < nfft, which is {nfft}.")
+            }
+            // Keep 1 sample, if overlap is 1 sample etc.
+            Overlap::Number { N } if N < nfft => N,
+
+            // If overlap percentage is >= 100, or < 0.0 its an error
+            Overlap::Percentage { pct } if !(0.0..100.).contains(&pct) => {
+                bail!("Invalid overlap percentage. Should be >= 0. And < 100.")
+            }
+            // If overlap percentage is 0, this gives
+            Overlap::Percentage { pct } => ((pct * nfft as Flt) / 100.) as usize,
+            Overlap::NoOverlap {} => 0,
+            _ => unreachable!(),
+        };
+        if overlap_keep >= nfft {
+            bail!("Computed overlap results in invalid number of overlap samples. Please make sure the FFT length is large enough, when high overlap percentages are required.");
+        }
+        Ok(overlap_keep)
+    }
+
+    /// Return a reasonable acoustic default with a frequency resolution around
+    /// ~ 10 Hz, where nfft is still an integer power of 2.
+    ///
+    /// # Errors
+    ///
+    /// If `fs` is something odd, i.e. < 1 kHz, or higher than 1 MHz.
+    ///
+    pub fn reasonableAcousticDefault(fs: Flt, mode: ApsMode) -> Result<ApsSettings> {
+        if fs < 1e3 || fs > 1e6 {
+            bail!("Sampling frequency for reasonable acoustic data is >= 1 kHz and <= 1 MHz.");
+        }
+        let fs_div_10_rounded = (fs / 10.) as u32;
+
+        // 2^30 is about 1 million. We search for a two-power of an nfft that is
+        // the closest to fs/10. The frequency resolution is about fs/nfft.
+        let nfft = (0..30).map(|i| 2u32.pow(i) - fs_div_10_rounded).fold(
+            // Start wth a value that is always too large
+            fs as u32 * 10,
+            |cur, new| cur.min(new),
+        ) as usize;
+
+        Ok(ApsSettings {
+            mode,
+            fs,
+            nfft,
+            windowType: WindowType::default(),
+            overlap: Overlap::default(),
+            freqWeightingType: FreqWeighting::default(),
+        })
+    }
+
+    /// Return sampling frequency
+    pub fn fs(&self) -> Flt {
+        self.fs
+    }
+
+    /// Return Nyquist frequency
+    pub fn fnyq(&self) -> Flt {
+        self.fs / 2.
+    }
+
+    /// Returns a single-sided frequency array corresponding to points in Power
+    /// spectra computation.
+    pub fn getFreq(&self) -> Array1<Flt> {
+        let df = self.fs / self.nfft as Flt;
+        let K = self.nfft / 2 + 1;
+        Array1::linspace(0., (K - 1) as Flt * df, K)
+    }
+}

src/ps/fft.rs

@@ -1,7 +1,7 @@
 //! Compute forward single sided amplitude spectra
 use crate::config::*;
 use realfft::{RealFftPlanner, RealToComplex};
-use std::sync::Arc;
+use std::{fmt::Debug, sync::Arc};
 
 #[derive(Clone)]
 pub struct FFT {
@@ -14,6 +14,11 @@ pub struct FFT {
     // nfft stored as float, this is how it is required most often
     nfftF: Flt,
 }
+impl Debug for FFT {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Forward FFT engine, lenfth: {self.nfftF}").finish()
+    }
+}
 
 impl FFT {
     /// Create new FFT from given nfft

src/ps/freqweighting.rs

@@ -1,12 +1,13 @@
 use crate::config::*;
-use strum_macros::{Display, EnumMessage};
+use strum::IntoEnumIterator;
+use strum_macros::{Display, EnumIter, EnumMessage};
 /// Sound level frequency weighting type (A, C, Z)
 
 // Do the following when Pyo3 0.22 can finally be used combined with rust-numpy:
 // #[cfg_attr(feature = "python-bindings", pyclass(eq, eq_int))]
 // For now:
 #[cfg_attr(feature = "python-bindings", pyclass)]
-#[derive(Display, Debug, EnumMessage, Default, Clone, PartialEq)]
+#[derive(Copy, Display, Debug, EnumMessage, Default, Clone, PartialEq, EnumIter)]
 pub enum FreqWeighting {
     /// A-weighting
     A,
@@ -16,6 +17,27 @@ pub enum FreqWeighting {
     #[default]
     Z,
 }
+
+#[cfg(feature = "python-bindings")]
+#[cfg_attr(feature = "python-bindings", pymethods)]
+impl FreqWeighting {
+    #[staticmethod]
+    fn all() -> Vec<Self> {
+        Self::iter().collect()
+    }
+    fn __str__(&self) -> String {
+        format!("{self}-weighting")
+    }
+    fn letter(&self) -> String {
+        format!("{self}")
+    }
+    #[staticmethod]
+    #[pyo3(name = "default")]
+    fn default_py() -> Self {
+        Self::default()
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;

src/ps/mod.rs

@@ -10,10 +10,16 @@ mod ps;
 mod timebuffer;
 mod window;
 mod freqweighting;
+mod apssettings;
+mod overlap;
+mod apsmode;
 use crate::config::*;
 
 
 pub use freqweighting::FreqWeighting;
-pub use aps::{ApsSettings, ApsSettingsBuilder,ApsMode, AvPowerSpectra, Overlap};
+pub use overlap::Overlap;
+pub use apssettings::{ApsSettings, ApsSettingsBuilder};
+pub use apsmode::ApsMode;
+pub use aps::AvPowerSpectra;
 pub use ps::{CrossPowerSpecra, PowerSpectra, CPSResult};
 pub use window::{Window, WindowType};

src/ps/overlap.rs

@@ -0,0 +1,78 @@
+use crate::config::*;
+///  Provide the overlap of blocks for computing averaged (cross) power spectra.
+///  Can be provided as a percentage of the block size, or as a number of
+///  samples.
+#[cfg_attr(feature = "python-bindings", pyclass(frozen))]
+#[derive(Clone, Debug, PartialEq)]
+pub enum Overlap {
+    /// Overlap specified as a percentage of the total FFT length. Value should
+    /// be 0<=pct<100.
+    Percentage {
+        /// Percentage
+        pct: Flt,
+    },
+    /// Number of samples to overlap
+    Number {
+        /// N: Number of samples
+        N: usize,
+    },
+    /// No overlap at all, which is the same as Overlap::Number(0)
+    NoOverlap {},
+}
+impl Default for Overlap {
+    fn default() -> Self {
+        Overlap::Percentage { pct: 50. }
+    }
+}
+
+#[cfg(feature = "python-bindings")]
+#[cfg_attr(feature = "python-bindings", pymethods)]
+impl Overlap {
+    #[inline]
+    fn __eq__(&self, other: &Self) -> bool {
+        self == other
+    }
+
+    fn __str__(&self) -> String {
+        self.name()
+    }
+
+    #[staticmethod]
+    #[pyo3(name = "default")]
+    fn default_py() -> Self {
+        Self::default()
+    }
+
+    /// Export some typical settings to Python. Customs are also possible by
+    /// directly creating them. This is to fill up the list.
+    #[staticmethod]
+    fn some_settings() -> Vec<Overlap> {
+        use Overlap::*;
+        vec![
+            NoOverlap {},
+            Percentage { pct: 25. },
+            Percentage { pct: 50. },
+            Percentage { pct: 90. },
+        ]
+    }
+}
+impl Overlap {
+    fn name(&self) -> String {
+        use Overlap::*;
+        match &self {
+            NoOverlap {} => "No overlap".into(),
+            Percentage { pct } => format! {"{} %", pct},
+            Number { N } => format! {"{} samples", N},
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::ps::overlap::Overlap;
+
+    #[test]
+    fn test_overlap1() {
+        assert_eq!(Overlap::NoOverlap {}.name(), "No overlap");
+    }
+}

src/ps/ps.rs

@@ -85,6 +85,7 @@ impl CrossPowerSpecra for CPSResult {
 /// example the computations of spectrograms, or Welch' method of spectral
 /// estimation.
 ///
+#[derive(Debug)]
 pub struct PowerSpectra {
     /// Window used in estimator. The actual Window in here is normalized with
     /// the square root of the Window power. This safes one division when
@@ -140,13 +141,15 @@ impl PowerSpectra {
     /// Compute FFTs of input channel data. Stores the scaled FFT data in
     /// self.freqdata.
     fn compute_ffts(&mut self, timedata: ArrayView2<Flt>) -> ArrayView2<Cflt> {
+        assert!(timedata.nrows() > 0);
         let (n, nch) = timedata.dim();
         let nfft = self.nfft();
         assert!(n == nfft);
 
         // Make sure enough fft engines are available
         while nch > self.ffts.len() {
-            self.ffts.push(self.ffts.last().unwrap().clone());
+            self.ffts
+                .push(self.ffts.last().expect("FFT's should not be empty").clone());
             self.freqdata
                 .push_column(Ccol::from_vec(vec![Cflt::new(0., 0.); nfft / 2 + 1]).view())
                 .unwrap();

src/ps/timebuffer.rs

@@ -8,7 +8,7 @@ use std::collections::VecDeque;
 /// TimeBuffer, storage to add blocks of data in a ring buffer, that can be
 /// extracted by blocks of other size. Also, we can keep samples in a buffer to
 /// create, for example, overlapping windows of time data.
-#[derive(Default)]
+#[derive(Default, Debug)]
 pub struct TimeBuffer {
     data: Vec<VecDeque<Flt>>,
 }

src/ps/window.rs

@@ -1,7 +1,8 @@
 #![allow(non_snake_case)]
 use crate::config::*;
 
-use strum_macros::Display;
+use strum::IntoEnumIterator;
+use strum_macros::{Display, EnumMessage, EnumIter};
 
 /// Von Hann window, often misnamed as the 'Hanning' window.
 fn hann(nfft: usize) -> Dcol {
@@ -72,7 +73,11 @@ fn hamming(N: usize) -> Dcol {
 /// * Blackman
 /// 
 /// The [WindowType::default] is [WindowType::Hann].
-#[derive(Display,Default, Copy, Clone, Debug)]
+#[derive(Display, Default, Copy, Clone, Debug, PartialEq, EnumMessage, EnumIter)]
+// Do the following when Pyo3 0.22 can finally be used combined with rust-numpy:
+// #[cfg_attr(feature = "python-bindings", pyclass(eq))]
+// For now:
+#[cfg_attr(feature = "python-bindings", pyclass)]
 pub enum WindowType {
     /// Von Hann window
     #[default]
@@ -87,8 +92,23 @@ pub enum WindowType {
     Blackman = 4,
 }
 
+#[cfg(feature = "python-bindings")]
+#[cfg_attr(feature = "python-bindings", pymethods)]
+impl WindowType {
+    #[staticmethod]
+    fn all() -> Vec<WindowType> {
+       WindowType::iter().collect()
+    }
+    #[staticmethod]
+    #[pyo3(name="default")]
+    fn default_py() -> Self {
+       Self::default()
+    }
+}
+
+
 /// Window (taper) computed from specified window type.
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct Window {
     /// The enum from which it is generated
     pub w: WindowType,

src/slm/mod.rs

@@ -60,11 +60,11 @@
 //! 
 //! ```
 //! 
-mod settings;
+mod slmsettings;
 mod tw;
 mod slm;
 pub use slm::SLM;
-pub use settings::{SLMSettings, SLMSettingsBuilder};
+pub use slmsettings::{SLMSettings, SLMSettingsBuilder};
 pub use tw::TimeWeighting;
 pub use crate::ps::FreqWeighting;
 

src/slm/slm.rs

@@ -6,7 +6,7 @@ use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
 use rayon::prelude::*;
 use smallvec::SmallVec;
 
-use super::{settings::SLMSettings, SLM_MAX_CHANNELS};
+use super::{slmsettings::SLMSettings, SLM_MAX_CHANNELS};
 use crate::{config::*, filter::Filter};
 use crate::{Biquad, Dcol, Flt, FreqWeighting, PoleOrZero, SeriesBiquad, ZPKModel};
 #[derive(Debug, Clone)]
@@ -205,7 +205,7 @@ impl SLM {
     }
 }
 
-#[cfg(feature="python-bindings")]
+#[cfg(feature = "python-bindings")]
 #[cfg_attr(feature = "python-bindings", pymethods)]
 impl SLM {
     #[new]
@@ -214,8 +214,18 @@ impl SLM {
     }
 
     #[pyo3(name = "run", signature=(dat, provide_output=true))]
-    fn run_py(&mut self, dat: PyArrayLike1<Flt>, provide_output: bool) -> Option<Vec<Vec<Flt>>> {
+    fn run_py<'py>(
-        self.run(dat.as_array().as_slice()?, provide_output)
+        &mut self,
+        py: Python<'py>,
+        dat: PyArrayLike1<Flt>,
+        provide_output: bool,
+    ) -> Option<Vec<Bound<'py, PyArray1<Flt>>>> {
+        if let Some(res) = self.run(dat.as_array().as_slice()?, provide_output) {
+            let vec_py_iter = res.into_iter().map(|v| PyArray1::from_vec_bound(py, v));
+            let vec_py = vec_py_iter.collect::<Vec<Bound<'py, PyArray1<Flt>>>>();
+            return Some(vec_py);
+        }
+        None
     }
 
     #[pyo3(name = "Lmax")]

src/slm/tw.rs

@@ -1,11 +1,14 @@
 use crate::config::*;
+
+use strum::EnumMessage;
+use strum_macros::Display;
 /// Time weighting to use in level detection of Sound Level Meter.
-/// 
+///
 // Do the following when Pyo3 0.22 can finally be used combined with rust-numpy:
 // #[cfg_attr(feature = "python-bindings", pyclass(eq))]
 // For now:
 #[cfg_attr(feature = "python-bindings", pyclass)]
-#[derive(Clone, Copy, PartialEq)]
+#[derive(Clone, Copy, Debug, PartialEq, Display)]
 pub enum TimeWeighting {
     // I know that the curly braces here are not required and add some
     // boilerplate, but this is the only way Pyo3 swallows complex enums at the
@@ -21,7 +24,7 @@ pub enum TimeWeighting {
         /// Custom time constant [s]
         t: Flt,
     },
-    
+
     /// A custom symmetric time weighting
     CustomAsymmetric {
         /// Time weighting when level is increasing
@@ -30,6 +33,23 @@ pub enum TimeWeighting {
         tdown: Flt,
     },
 }
+
+#[cfg_attr(feature = "python-bindings", pymethods)]
+impl TimeWeighting {
+    // This method is still required in Pyo3 0.21, not anymore in 0.22
+    fn __eq__(&self, other: &Self) -> bool {
+        self == other
+    }
+    fn __str__(&self) -> String {
+        format!("{self}")
+    }
+    #[staticmethod]
+    fn all_standards() -> Vec<TimeWeighting> {
+        use TimeWeighting::*;
+        vec![Slow {}, Fast {}, Impulse {}]
+    }
+}
+
 impl Default for TimeWeighting {
     fn default() -> Self {
         TimeWeighting::Fast {}
@@ -75,3 +95,15 @@ impl TimeWeighting {
         }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use crate::slm::TimeWeighting;
+
+    #[test]
+    fn test_tw() {
+        println!("Impulse: {}", TimeWeighting::Impulse {});
+        println!("Fast   : {}", TimeWeighting::Fast {});
+        println!("Slow   : {}", TimeWeighting::Slow {});
+    }
+}