89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
// lasp_ppm.h
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//
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// Author: J.A. de Jong - ASCEE
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//
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// Description: Peak Programme Meter
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#pragma once
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#include <memory>
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#include "lasp_filter.h"
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#include "lasp_mathtypes.h"
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#include "lasp_threadedindatahandler.h"
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/**
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* \addtogroup dsp
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* @{
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*
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* \addtogroup rt
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* @{
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*/
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/**
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* @brief Digital Peak Programme Meter (PPM). Let the latest maximum flow away
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* with a certain amount of dB/s. If a new peak is found, it goes up again.
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* Also detects clipping.
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* */
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class PPMHandler: public ThreadedInDataHandler {
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/**
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* @brief Assuming full scale of a signal is +/- 1.0. If a value is found
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*/
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static inline const d clip_point = 0.98;
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/**
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* @brief How long it takes in [s] after a clip event has happened, that we
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* are actually still in 'clip' mode.
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*/
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static inline const d clip_indication_time = 3.0;
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const d _decay_dBps;
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/**
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* @brief Inverse of block sampling frequency [s]: (framesPerBlock/fs)
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*/
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d _dt;
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/**
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* @brief 1st order low_pass value of levels, based on _decay_dBps;
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*/
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d _alpha;
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mutable std::mutex _mtx;
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/**
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* @brief Current maximum values
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*/
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vd _cur_max;
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/**
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* @brief How long ago the last clip has happened. Negative in case no clip
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* has happened.
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*/
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vd _clip_time;
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public:
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/**
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* @brief Constructs Peak Programme Meter
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*
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* @param mgr Stream Mgr to operate on
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* @param decay_dBps The level decay in units dB/s, after a peak has been
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* hit.
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*/
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PPMHandler(StreamMgr& mgr,const d decay_dBps = 20.0);
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~PPMHandler();
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/**
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* @brief Get the current values of the PPM. Returns an array of levels in dB
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* and a vector of True's.
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*
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* @return Current levels in [dB], clipping indication
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*/
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std::tuple<vd,arma::uvec> getCurrentValue() const;
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bool inCallback_threaded(const DaqData& ) override final;
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void reset(const Daq*) override final;
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};
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/** @} */
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/** @} */
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