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OpenAudio_ArduinoLibrary/analyze_tonedetect_F32.cpp

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3.6 KiB

/*
* analyze_tonedetect_F32.cpp Converted to float from PJRC Teensy Audio Library
* MIT License on changed portions
* Bob Larkin March 2021
*
* Audio Library for Teensy 3.X
* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
*
* Development of this audio library was funded by PJRC.COM, LLC by sales of
* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
* open source software by purchasing Teensy or other PJRC products.
*
* 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, development funding 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.
*/
#include <Arduino.h>
#include "analyze_tonedetect_F32.h"
//#include "utility/dspinst.h"
void AudioAnalyzeToneDetect_F32::update(void) {
audio_block_f32_t *block;
float q0, q1, q2, coef;
float *p, *end;
uint16_t n;
block = receiveReadOnly_f32();
if (!block) return;
if (!enabled) {
release(block);
return;
}
p = block->data;
end = p + AUDIO_BLOCK_SAMPLES;
n = count;
coef = coefficient;
q1 = s1;
q2 = s2;
if(n==length) {q1=0.0f; q2=0.0; }
do { // Update Goertzel algorithm
q0 = (*p++) + coef*q1 - q2;
q2 = q1;
q1 = q0;
if (--n == 0) { // Full "count" been achieved, estimate done
out1 = q1;
out2 = q2;
q1 = 0.0f;
q2 = 0.0f;
new_output = true;
n = length;
}
} while (p < end);
count = n;
s1 = q1;
s2 = q2;
release(block);
}
void AudioAnalyzeToneDetect_F32::set_params(float coef, uint16_t cycles, uint16_t len) {
__disable_irq();
coefficient = coef;
ncycles = cycles;
length = len;
count = len;
s1 = 0.0f;
s2 = 0.0f;
enabled = true;
__enable_irq();
}
float AudioAnalyzeToneDetect_F32::read(void) {
float coef, q1, q2, power;
uint16_t len;
__disable_irq();
coef = coefficient;
q1 = out1;
q2 = out2;
len = length;
__enable_irq();
power = q1*q1 + q2*q2 - q1*q2*coef;
return 2.0f*sqrtf(power)/(float)len; // Scale to (0.0, 1.0)
}
AudioAnalyzeToneDetect_F32::operator bool() {
float coef, q1, q2, power, trigger;
uint16_t len;
__disable_irq();
coef = coefficient;
q1 = out1;
q2 = out2;
len = length;
__enable_irq();
trigger = (float)len * thresh;
trigger *= trigger;
//Serial.println("bool: power, trigger = "); Serial.print(power, 6); Serial.print(", "); Serial.println(trigger, 6);
return (power >= trigger);
// TODO: this should really remember if it's retuned true previously,
// so it can give a single true response each time a tone is seen.
}