Merge branch 'develop' into windows_ready

src/lasp/device/lasp_uldaq.cpp

@@ -67,10 +67,7 @@ void fillUlDaqDeviceInfo(DeviceInfoList &devinfolist) {
         DataTypeDescriptor::DataType::dtype_fl64);
     devinfo.prefDataTypeIndex = 0;
 
-    devinfo.availableSampleRates = {8000,  10000, 11025, 16000, 20000,
+    devinfo.availableSampleRates = ULDAQ_SAMPLERATES;
-                                    22050, 24000, 32000, 44056, 44100,
-                                    47250, 48000, 50000, 50400, 51000};
-
     devinfo.prefSampleRateIndex = 11;
 
     devinfo.availableFramesPerBlock = {512, 1024, 2048, 4096, 8192};

src/lasp/device/lasp_uldaq_impl.cpp

@@ -70,7 +70,7 @@ DT9837A::DT9837A(const DeviceInfo &devinfo, const DaqConfiguration &config)
     throw rte("Unsensible number of samples per block chosen");
   }
 
-  if (samplerate() < 10000 || samplerate() > 51000) {
+  if (samplerate() < ULDAQ_SAMPLERATES.at(0) || samplerate() > ULDAQ_SAMPLERATES.at(ULDAQ_SAMPLERATES.size()-1)) {
     throw rte("Invalid sample rate");
   }
 

src/lasp/device/lasp_uldaq_impl.h

@@ -14,6 +14,14 @@ using std::cerr;
 using std::endl;
 using rte = std::runtime_error;
 
+/**
+ * @brief List of available sampling frequencies for DT9837A
+ */
+const std::vector<d> ULDAQ_SAMPLERATES = {8000,  10000, 11025, 16000, 20000,
+                                    22050, 24000, 32000, 44056, 44100,
+                                    47250, 48000, 50000, 50400, 51000};
+
+
 /**
  * @brief UlDaq-specific device information. Adds a copy of the underlying
  * DaqDeDaqDeviceDescriptor.

src/lasp/filter/biquad.py

@@ -23,7 +23,8 @@ y[n] = 1/ba[3] * (  ba[0] * x[n]   + ba[1] * x[n-1] + ba[2] * x[n-2] +
 
 """
 __all__ = ['peaking', 'biquadTF', 'notch', 'lowpass', 'highpass',
-           'highshelf', 'lowshelf', 'LPcompensator', 'HPcompensator']
+           'highshelf', 'lowshelf', 'LP1compensator', 'LP2compensator',
+           'HP1compensator', 'HP2compensator']
 
 from numpy import array, cos, pi, sin, sqrt
 from scipy.interpolate import interp1d
@@ -157,7 +158,32 @@ def lowshelf(fs, f0, Q, gain):
     a2 = (A+1) + (A-1)*cos(w0) - 2*sqrt(A)*alpha
     return array([b0/a0, b1/a0, b2/a0, a0/a0, a1/a0, a2/a0])
 
-def LPcompensator(fs, f0o, Qo, f0n, Qn):
+def LP1compensator(fs, f0o, f0n):
+    """
+    Shelving type filter that, when multiplied with a first-order low-pass 
+    filter, alters the response of that filter to a different first-order
+    low-pass filter.
+
+    Args:
+        fs: Sampling frequency [Hz]
+        f0o: Cut-off frequency of the original filter [Hz]        
+        f0n: Desired cut-off frequency [Hz]
+    """
+    
+    omg0o = 2*pi*f0o
+    omg0n = 2*pi*f0n
+    
+    z = -omg0o
+    p = -omg0n
+    k = p/z
+    
+    zd, pd, kd = bilinear_zpk(z, p, k, fs)
+
+    sos = zpk2sos(zd,pd,kd)
+    
+    return sos[0]
+
+def LP2compensator(fs, f0o, Qo, f0n, Qn):
     """
     Shelving type filter that, when multiplied with a second-order low-pass 
     filter, alters the response of that filter to a different second-order
@@ -194,7 +220,32 @@ def LPcompensator(fs, f0o, Qo, f0n, Qn):
     
     return sos[0]
 
-def HPcompensator(fs, f0o, Qo, f0n, Qn):
+def HP1compensator(fs, f0o, f0n):
+    """
+    Shelving type filter that, when multiplied with a first-order high-pass 
+    filter, alters the response of that filter to a different first-order
+    high-pass filter.
+
+    Args:
+        fs: Sampling frequency [Hz]
+        f0o: Cut-on frequency of the original filter [Hz]        
+        f0n: Desired cut-on frequency [Hz]
+    """
+    
+    omg0o = 2*pi*f0o
+    omg0n = 2*pi*f0n
+    
+    z = -omg0o
+    p = -omg0n
+    k = 1
+    
+    zd, pd, kd = bilinear_zpk(z, p, k, fs)
+
+    sos = zpk2sos(zd,pd,kd)
+    
+    return sos[0]
+
+def HP2compensator(fs, f0o, Qo, f0n, Qn):
     """
     Shelving type filter that, when multiplied with a second-order high-pass
     filter, alters the response of that filter to a different second-order 

src/lasp/lasp_measurement.py

@@ -52,6 +52,7 @@ import os, time, wave, logging
 from .lasp_common import SIQtys, Qty, getFreq
 from .lasp_cpp import Window, DaqChannel, LASP_VERSION_MAJOR, AvPowerSpectra
 from typing import List
+from functools import lru_cache
 
 
 def getSampWidth(dtype):
@@ -248,6 +249,9 @@ class Measurement:
             except KeyError:
                 self._sens = np.ones(self.nchannels)
 
+            # The time is cached AND ALWAYS ASSUMED TO BE AN IMMUTABLE OBJECT.
+            # It is also cached. Changing the measurement timestamp should not
+            # be done.
             self._time = f.attrs['time']
 
             # Quantity stored as channel.
@@ -270,7 +274,6 @@ class Measurement:
                 self._qtys = [SIQtys.default() for i in range(self.nchannels)]
                 logging.debug(f'Physical quantity data not available in measurement file. Assuming {SIQtys.default}')
 
-
     def setAttribute(self, atrname, value):
         """
         Set an attribute in the measurement file, and keep a local copy in
@@ -375,6 +378,7 @@ class Measurement:
             self._comment = cmt
 
     @property
+    @lru_cache()
     def recTime(self):
         """Returns the total recording time of the measurement, in float
         seconds."""
@@ -385,6 +389,19 @@ class Measurement:
         """Returns the measurement time in seconds since the epoch."""
         return self._time
 
+    @property
+    @lru_cache()
+    def timestr(self):
+        """
+        Return a properly formatted string of the measurement time, in order of
+
+        year-month-day hour etc.
+
+        """
+        time_struct = time.localtime(self.time)
+        time_string = time.strftime('%Y-%m-%d %H:%M:%S', time_struct)
+        return time_string
+
     def rms(self, channels=None, substract_average=False):
         """Returns the root mean square values for each channel
 
@@ -614,8 +631,8 @@ class Measurement:
             return False
 
 
-    def exportAsWave(self, fn=None, force=False, newsampwidth=None,
+    def exportAsWave(self, fn=None, force=False, dtype=None,
-                     normalize=True, **kwargs):
+                     normalize=False, **kwargs):
         """Export measurement file as wave. In case the measurement data is
         stored as floats, the values are scaled to the proper integer (PCM)
         data format.
@@ -627,9 +644,8 @@ class Measurement:
             force: If True, overwrites any existing files with the given name
             , otherwise a RuntimeError is raised.
 
-            newsampwidth: sample width in bytes with which to export the data.
+            dtype: if not None, convert data to this data type.
-            This should only be given in case the measurement data is stored as
+            Options are 'int16', 'int32', 'float32'.
-            floating point values, otherwise an error is thrown
 
             normalize: If set: normalize the level to something sensible.
         """
@@ -643,39 +659,49 @@ class Measurement:
         if os.path.exists(fn) and not force:
             raise RuntimeError(f'File already exists: {fn}')
 
-
         if not np.isclose(self.samplerate%1,0):
             raise RuntimeError(f'Sample rates should be approximately integer for exporting to Wave to work')
 
         # TODO: With VERY large measurment files, this is not possible! Is this
         # a theoretical case?
+        # TODO: add sensitivity? Then use self.data() instead of self.rawData()
         data = self.rawData(**kwargs)
-        if np.issubdtype(data.dtype, np.floating) and newsampwidth is None:
-            raise ValueError('Newsampwidth parameter should be given for floating point raw data')
 
         if normalize:
             # Scale back to maximum of absolute value
             maxabs = np.max(np.abs(data))
             data = data / maxabs  # "data /= maxabs" fails if dtpyes differ
 
-        if newsampwidth is not None:
+        if dtype==None:
-            # Convert to floats, then to new sample width
+            dtype = data.dtype  # keep existing
+            logging.debug(f"dtype not passed as arg; using dtype = {dtype}")
+
+        # dtype conversion
+        if dtype=='int16':
+            newtype = np.int16
+            newsampwidth = 2
+        elif dtype=='int32':
+            newtype = np.int32
+            newsampwidth = 4
+        elif dtype=='float32':
+            newtype = np.float32
+        elif dtype=='float64':
+            newtype = np.float64
+        else:
+            logging.debug(f"cannot handle this dtype {dtype}")
+            pass
+
+        # Convert range to [-1, 1]
+        # TODO: this is wrong for float data where full scale > 1
         sensone = np.ones_like(self.sensitivity)
         data = scaleBlockSens(data, sensone)
 
-            if newsampwidth == 2:
+        if dtype=='int16' or dtype=='int32':
-                newtype = np.int16
+            # Scale data to integer range and convert to integers
-            elif newsampwidth == 4:
-                newtype = np.int32
-            else:
-                raise ValueError('Invalid sample width, should be 2 or 4')
-
             scalefac = 2**(8*newsampwidth-1)-1
-
-            # Scale data to integer range, and then convert to integers
             data = (data*scalefac).astype(newtype)
 
-        wavfile.write(fn, int(self.samplerate), data)
+        wavfile.write(fn, int(self.samplerate), data.astype(newtype))
 
     @staticmethod
     def fromtxt(fn,