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122 lines
3.9 KiB
122 lines
3.9 KiB
/*
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* analyze_tonedetect_F32.cpp Converted to float from PJRC Teensy Audio Library
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* for the OpenAudio_TeensyArduino library (floating point audio).
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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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* See also analyze_CTCSS_F32 that is specific for the CTCSS tone system
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* with tones in the 67.0 to 250.3 Hz range. (In this same library)
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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*gain*sqrtf(power)/(float)len; // Scaled to gain*(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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power = gain*gain*(q1*q1 + q2*q2 - q1*q2*coef);
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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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}
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