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/*
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* analyze_tonedetect_F32.cpp Converted to float from PJRC Teensy Audio Library |
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* MIT License on changed portions |
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* Bob Larkin March 2021 |
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* |
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* Audio Library for Teensy 3.X |
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* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com |
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* |
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* Development of this audio library was funded by PJRC.COM, LLC by sales of |
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop |
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* open source software by purchasing Teensy or other PJRC products. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice, development funding notice, and this permission |
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* notice shall be included in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#include <Arduino.h> |
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#include "analyze_tonedetect_F32.h" |
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//#include "utility/dspinst.h"
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void AudioAnalyzeToneDetect_F32::update(void) { |
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audio_block_f32_t *block; |
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float q0, q1, q2, coef; |
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float *p, *end; |
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uint16_t n; |
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block = receiveReadOnly_f32(); |
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if (!block) return; |
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if (!enabled) { |
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release(block); |
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return; |
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} |
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p = block->data; |
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end = p + AUDIO_BLOCK_SAMPLES; |
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n = count; |
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coef = coefficient; |
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q1 = s1; |
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q2 = s2; |
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if(n==length) {q1=0.0f; q2=0.0; } |
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do { // Update Goertzel algorithm
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q0 = (*p++) + coef*q1 - q2; |
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q2 = q1; |
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q1 = q0; |
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if (--n == 0) { // Full "count" been achieved, estimate done
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out1 = q1; |
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out2 = q2; |
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q1 = 0.0f; |
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q2 = 0.0f; |
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new_output = true; |
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n = length; |
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} |
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} while (p < end); |
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count = n; |
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s1 = q1; |
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s2 = q2; |
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release(block); |
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} |
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void AudioAnalyzeToneDetect_F32::set_params(float coef, uint16_t cycles, uint16_t len) { |
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__disable_irq(); |
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coefficient = coef; |
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ncycles = cycles; |
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length = len; |
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count = len; |
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s1 = 0.0f; |
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s2 = 0.0f; |
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enabled = true; |
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__enable_irq(); |
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} |
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float AudioAnalyzeToneDetect_F32::read(void) { |
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float coef, q1, q2, power; |
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uint16_t len; |
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__disable_irq(); |
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coef = coefficient; |
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q1 = out1; |
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q2 = out2; |
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len = length; |
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__enable_irq(); |
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power = q1*q1 + q2*q2 - q1*q2*coef; |
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return 2.0f*sqrtf(power)/(float)len; // Scale to (0.0, 1.0)
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} |
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AudioAnalyzeToneDetect_F32::operator bool() { |
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float coef, q1, q2, power, trigger; |
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uint16_t len; |
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__disable_irq(); |
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coef = coefficient; |
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q1 = out1; |
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q2 = out2; |
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len = length; |
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__enable_irq(); |
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trigger = (float)len * thresh; |
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trigger *= trigger; |
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//Serial.println("bool: power, trigger = "); Serial.print(power, 6); Serial.print(", "); Serial.println(trigger, 6);
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return (power >= trigger); |
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// TODO: this should really remember if it's retuned true previously,
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// so it can give a single true response each time a tone is seen.
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} |
@ -0,0 +1,101 @@ |
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/*
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* analyze_tonedetect_F32.h Converted to float from PJRC Teensy Audio Library |
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* MIT License on changed portions |
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* Bob Larkin March 2021 |
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* |
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* Audio Library for Teensy 3.X |
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* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com |
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* |
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* Development of this audio library was funded by PJRC.COM, LLC by sales of |
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop |
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* open source software by purchasing Teensy or other PJRC products. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
||||
* in the Software without restriction, including without limitation the rights |
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* 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: |
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* |
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* The above copyright notice, development funding notice, and this permission |
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* notice shall be included in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#ifndef analyze_tonedetect_F32_h_ |
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#define analyze_tonedetect_F32_h_ |
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#include "Arduino.h" |
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#include "AudioStream_F32.h" |
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class AudioAnalyzeToneDetect_F32 : public AudioStream_F32 |
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{ |
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//GUI: inputs:1, outputs:0 //this line used for automatic generation of GUI node
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//GUI: shortName:ToneDet
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public: |
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AudioAnalyzeToneDetect_F32(void) |
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: AudioStream_F32(1, inputQueueArray_f32), thresh(0.1f), enabled(false) { |
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sample_rate_Hz = AUDIO_SAMPLE_RATE; |
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block_size = AUDIO_BLOCK_SAMPLES; |
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} |
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// Option of AudioSettings_F32 change to block size and/or sample rate:
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AudioAnalyzeToneDetect_F32(const AudioSettings_F32 &settings) : AudioStream_F32(1, inputQueueArray_f32), |
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thresh(0.1f), enabled(false) { |
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sample_rate_Hz = settings.sample_rate_Hz; |
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block_size = settings.audio_block_samples; |
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} |
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void frequency(float freq, uint16_t cycles=10) { |
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set_params( 2.0f*cosf(freq*6.28318530718f/sample_rate_Hz), |
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cycles, |
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(uint16_t)( 0.5f + sample_rate_Hz*(float)cycles/freq) ); |
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//(uint16_t)( ( (float)sample_rate_Hz/freq*(float)cycles) + 0.5f) );
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} |
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bool available(void) { |
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__disable_irq(); |
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bool flag = new_output; |
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if(flag) |
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new_output = false; |
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__enable_irq(); |
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return flag; |
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} |
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float read(void); |
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void threshold(float level) { |
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if (level < 0.01f) thresh = 0.01f; |
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else if (level > 0.99f) thresh = 0.99f; |
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else thresh = level; |
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} |
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operator bool(); // true if at or above threshold, false if below
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void set_params(float coef, uint16_t cycles, uint16_t len); |
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virtual void update(void); |
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private: |
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float coefficient; // Goertzel algorithm coefficient
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float s1, s2; // Goertzel algorithm state
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float out1, out2; // Goertzel algorithm state output
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float power; |
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uint16_t length; // number of samples to analyze
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uint16_t count; // how many left to analyze
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uint16_t ncycles; // number of waveform cycles to seek
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uint16_t thresh = 0.1f; // threshold, 0.01 to 0.99
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bool enabled = false; |
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volatile bool new_output = false; |
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audio_block_f32_t *inputQueueArray_f32[1]; |
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float sample_rate_Hz = AUDIO_SAMPLE_RATE; |
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uint16_t block_size = 128; |
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}; |
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#endif |
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