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/*
* The MIT License (MIT)
*
* Copyright (c) 2018 Matthias P. Braendli, Maximilien Cuony
*
* 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.
*/
#ifndef __TONE_H_
#define __TONE_H_
#include <stdio.h>
#include "Audio/audio_in.h"
#define TONE_BUFFER_LEN AUDIO_IN_BUF_LEN
#define TONE_N 100
struct tone_detector {
float coef;
float Q1;
float Q2;
float threshold;
int num_samples_analysed;
};
void tone_init(int threshold);
/* Return 1 when 1750 detected, 0 otherwise */
int tone_1750_status(void);
/* Update 1750 tone detection status */
void tone_detect_1750(const int16_t *samples, int len);
#endif
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