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bootloader
drivers
hardware_design
resources
__init__.py
audio_cv_meter.h
compressor.cc
compressor.h
cv_scaler.cc
cv_scaler.h
envelope.cc
envelope.h
filter_controller.h
follower.cc
follower.h
gain.h
lorenz_generator.cc
lorenz_generator.h
makefile
meta_parameters.h
processor.cc
processor.h
resources.cc
resources.h
streams.cc
svf.cc
svf.h
ui.cc
ui.h
vactrol.cc
vactrol.h
audio_cv_meter.h
// Copyright 2014 Olivier Gillet. // // Author: Olivier Gillet (ol.gillet@gmail.com) // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. // // See http://creativecommons.org/licenses/MIT/ for more information. // // ----------------------------------------------------------------------------- // // Discriminate an ADC signal into audio or CV ; and provide RMS stats. #ifndef STREAMS_AUDIO_CV_METER_H_ #define STREAMS_AUDIO_CV_METER_H_ #include "stmlib/stmlib.h" namespace streams { class AudioCvMeter { public: AudioCvMeter() { } ~AudioCvMeter() { } void Init() { peak_ = 0; zero_crossing_interval_ = 0; average_zero_crossing_interval_ = 0; previous_sample_ = 0; cv_ = false; } void Process(int32_t sample) { if ((sample >> 1) * previous_sample_ < 0 || zero_crossing_interval_ >= 4096) { int32_t error = zero_crossing_interval_ - average_zero_crossing_interval_; average_zero_crossing_interval_ += error >> 3; zero_crossing_interval_ = 0; } else { ++zero_crossing_interval_; } if (cv_ && average_zero_crossing_interval_ < 200) { cv_ = false; } else if (!cv_ && average_zero_crossing_interval_ > 400) { cv_ = true; } previous_sample_ = sample; if (sample < 0) { sample = -sample; } int32_t error = sample - peak_; int32_t coefficient = 33; // 250ms at 1kHz if (error > 0) { coefficient = 809; // 10ms at 1kHz } peak_ += error * coefficient >> 15; } inline bool cv() const { return cv_; } inline int32_t peak() const { return peak_; } private: bool cv_; int32_t peak_; int32_t zero_crossing_interval_; int32_t average_zero_crossing_interval_; int32_t previous_sample_; DISALLOW_COPY_AND_ASSIGN(AudioCvMeter); }; } // namespace streams #endif // STREAMS_AUDIO_CV_METER_H_
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