You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
2.8 KiB
68 lines
2.8 KiB
/*
|
|
* This is a direct translation of the Teensy Audio Library RMS Analyze
|
|
* to use floating point f32. This is intended to be compatible with
|
|
* Chip Audette's floating point libraries.
|
|
* Bob Larkin 23 April 2020 - AudioAnalyze_RMS_F32
|
|
*
|
|
* Regard the Paul Stoffregen copyright and licensing:
|
|
*
|
|
* 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 "AudioStream_F32.h"
|
|
#include "analyze_rms_f32.h"
|
|
|
|
void AudioAnalyzeRMS_F32::update(void) {
|
|
float32_t *p;
|
|
float32_t sum = 0.0f;
|
|
audio_block_f32_t *blockIn;
|
|
|
|
blockIn = AudioStream_F32::receiveReadOnly_f32();
|
|
if (!blockIn) {
|
|
if(errorPrint) Serial.println("AN_RMS ERR: No input");
|
|
// count++; // Why ++? We are not adding to accum
|
|
return;
|
|
}
|
|
|
|
p = blockIn->data;
|
|
// Find sum of powers for full vector, see
|
|
// https://github.com/ARM-software/CMSIS/blob/master/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_dot_prod_f32.c
|
|
// arguments are (source vector 1, source vector 2, number of samples, pointer to f32 out)
|
|
arm_dot_prod_f32(p, p, block_size, &sum);
|
|
accum += (double)sum;
|
|
count++;
|
|
AudioStream_F32::release(blockIn);
|
|
}
|
|
|
|
float AudioAnalyzeRMS_F32::read(void) {
|
|
__disable_irq();
|
|
// It is safe to convert back to float now
|
|
float32_t sum = (float32_t)accum;
|
|
accum = 0.0;
|
|
float32_t num = (float32_t)count;
|
|
count = 0;
|
|
__enable_irq();
|
|
return sqrtf(sum / (num * (float32_t)block_size));
|
|
}
|
|
|