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Added analyze_CTCSS sub-audible tone detector

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boblark 2 years ago
parent 04621cb54e
commit 42419879ee
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  1. 1
      OpenAudio_ArduinoLibrary.h
  2. 121
      analyze_CTCSS_F32.cpp
  3. 505
      analyze_CTCSS_F32.h
  4. 122
      keywords.txt

1
OpenAudio_ArduinoLibrary.h
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#include "synth_waveform_F32.h"
#include "synth_whitenoise_f32.h"
#include "synth_GaussianWhiteNoise_F32.h"
#include "analyze_CTCSS_F32.h"
#include "analyze_fft1024_F32.h"
#include "analyze_fft256_iq_F32.h"
#include "analyze_fft1024_iq_F32.h"

121
analyze_CTCSS_F32.cpp
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/*
* analyze_CTCSS_F32.cpp Converted to float from PJRC Teensy Audio Library
* MIT License on changed portions
* Bob Larkin March 2021
*
* Some parts of this cpp came from: 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.
*/
/* From Pavel Rajmic (2021). Generalized Goertzel algorithm
* https://www.mathworks.com/matlabcentral/fileexchange/35103-generalized-goertzel-algorithm
* MATLAB Central File Exchange. Retrieved December 18, 2021.
*/
#include <Arduino.h>
#include "analyze_CTCSS_F32.h"
void analyze_CTCSS_F32::update(void) {
audio_block_f32_t *block;
float gs0=0.0;
block = receiveReadOnly_f32();
if (!block) return;
if (!gEnabled) {
release(block);
return;
}
// This process is working with frequencies of 254 Hz or less. Thus
// it is beneficial to decimate before processing. The chosen
// decimation rate is 16. For example, if the basic sample rate is 44.1 kHz,
// the decimated rate is 44100/16=2756.25 Hz Before decimation, we
// low pass filter to prevent alias problems. Returns 128 pts in block.
arm_biquad_cascade_df1_f32(&iir_lpf_inst, block->data,
block->data, block->length);
// And decimate, using the first sample, giving 128/16=8 samples to
// be processed per block.
// Create a small data block, normally 8, d16a[].
for(int i=0; i<8; i++)
d16a[i] = *(block->data + 16*i); // Decimated sample, only every 16
// Filter down to 67-254Hz band, leaving result in d16a[];
arm_biquad_cascade_df1_f32(&iir_bpf_inst, d16a, d16a, 8);
// For reference measurement, only, null out the tone, creating d16b[].
// This d16b signal path is not used for the Goertzel.
arm_biquad_cascade_df1_f32(&iir_nulls_inst, d16a, d16b, 8);
for(int i=0; i<8; i++)
{
if(gCount++ < gLength) // Main Goertzel calculation
{
// Use decimated sample, only every 16
gs0 = d16a[i] + gCoefficient*gs1 - gs2;
gs2 = gs1;
gs1 = gs0;
// Do reference channel power measurement of the 67 to 254 Hz
// band, including nulls at tone frequency.
powerSum += d16b[i]*d16b[i];
powerSumCount++;
}
else // The last, special, calculation
{
gs0 = gCoefficient*gs1 - gs2; // Generalized non-integer freq Goertzel
out1 = gs0 - gs1*ccRe;
out2 = - gs1*ccIm;
// At this point the phase is still in need of correction. But we
// only use amplitude so, leave the phase as is.
powerTone = 4.0f*(out1*out1 + out2*out2)/((float)gLength*(float)gLength);
// 2.0f*sqrtf(powerTone)/(float)gLength; <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
gs1 = 0.0; // Initialize to start new measurement
gs2 = 0.0;
gCount = 0;
// The 2.04 factor makes the reference for sine waves the same as the Goertzel
powerRef = 2.04f*powerSum/((float)powerSumCount);
powerSum = 0.0f;
powerSumCount = 0;
new_output = true;
}
}
// If the CTCSS tone is detected, the output is the original data block.
// If silenced, zeros are returned.
if(powerTone>threshAbs && powerTone>threshRel*powerRef)
transmit(block);
else
{
for(int i = 0; i<128; i++)
*(block->data + i) = 0.0;
transmit(block);
}
release(block);
}
analyze_CTCSS_F32::operator bool() {
float pThresh;
pThresh = ((float)gLength)*threshAbs;
pThresh *= pThresh;
return (powerTone >= pThresh);
}

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analyze_CTCSS_F32.h
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/*
* analyze_CTCSS_F32.h For the OpenAudio_TeensyArduino library
* (floating point audio).
* MIT License on changed portions
* Bob Larkin March 2021
*
* This is specific for the CTCSS tone system
* with tones in the 67.0 to 254.1 Hz range.
*
* Parts of this are based on analyze_toneDetect: 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.
*/
/* The tone frequency is set by the function frequency(float freq, float tMeas).
* The parameter freq is in Hz. The parameter tMeas is optional and is the
* measuring time for the Goertzel algorithm, measured in milliseconds. Sort
* tMeas, say 100, give fast response, but poor selectivity to adjacent tone
* frequencies. Long values, say 500 to 1000, are sluggish and for NBFM systems
* tend to omit initial words. The default for tMeas is 300 milliseconds.
*
* CTCSS ranges from 67.0 to 254.1 Hz
(Actual CTCSS use seems to be 77.0 to 203.5 Hz)
This object can be used on any frequency in the range.
But, the standard CTCSS channel numbers, designations and
frequencies, in Hz, are:
1 XZ 67 25 5A 156.7
39 WZ 69.3 40 159.8
2 XA 71.9 26 5B 162.2
3 WA 74.4 41 165.5
4 XB 77 27 6Z 167.9
5 WB 79.7 42 171.3
6 YZ 82.5 28 6A 173.8
7 YA 85.4 43 177.3
8 YB 88.5 29 6B 179.9
9 ZZ 91.5 44 183.5
10 ZA 94.8 30 7Z 186.2
11 ZB 97.4 45 189.9
12 1Z 100 31 7A 192.8
13 1A 103.5 46 196.6
14 1B 107.2 47 199.5
15 2Z 110.9 32 M1 203.5
16 2A 114.8 48 8Z 206.5
17 2B 118.8 33 M2 210.7
18 3Z 123 34 M3 218.1
19 3A 127.3 35 M4 225.7
20 3B 131.8 49 9Z 229.1
21 4Z 136.5 36 M5 233.6
22 4A 141.3 37 M6 241.8
23 4B 146.2 38 M7 250.3
24 5Z 151.4 50 0Z 254.1
*/
/* FUTURE (Let's see this all working without windowing, first):
* This CTCSS detector has an optional windowing function. The default is
* no windowing, but this leaves the first Goertzel filter
* sideband at about -13 dB relative to the tone frequency response. See
* setGWindow(float *pWinCoeff) below. The caller supplied window function is
* an array of NWINDOW floats corresponding to half of the window
* function, starting with the outside (non-center) coefficient. The number
* of coefficients depends on the sample rate of the ADC and the amount
* time to make a detector measurement. The following might be used in an
* .ino to set the size of the half array. This is in pre-compiler lingo
* as it needs to be installed at compile time, not run time:
* #define SAMPLE_RATE 44117.0f
* #define DETECTOR_TIME 300.0f
* #define NWINDOW (uint16_t)( 0.5 + SAMPLE_RATE * DETECTOR_TIME / 32000.0f )
* See example/ToneDetect2. Note that DETECTOR_TIME is in milliseconds.
*/
/* This class can be used to see if a sub-audible tone is present with resulting
* action coming through the .ino. This uses available() and readTonePresent().
* Alternatively, the threshold(s) can be set
* and the comparison results used to gate the input signal through to other
* audio blocks. Done this way, the audio gating is done without
* any .ino processing.
*
* Note - Both the Goertzel tone output and the reference band outputs are in
* "power." This is convenient and meaningful for the CTCSS detector, but
* different than the Teensy library tone detectors, which take the square
* root of the power for output.
*
* Two outputs are available, TonePower and RefPower. TonePower is the output
* of the Goertzel sharply tuned filter and is the conventional CTCSS output
* that is compared to a threshold. RefPower measures the power in the entire
* 67 to 254 Hz sub-audible band, except at the tone frequency. This is a measure
* of both FM quieting and also the presence of a tone away from the TonePower
* frequency. By comparing TonePower to RefPower several dB of increased
* sensitivity is achieved for threshold setting.
*
* Thresholds are used in two ways. FirstThey can be read by the .ino
* with readTonePresent(what) where "what" allows an absolute threshod comparison
* on Tone Power, a relative comparison between Tone Power and RefPower,
* or both. The relative comparison is the preferred form for many applicatins.
* Parameter "what" can be isAbsThreshold, isRelThreshold or isBothThreshold.
*
* The second method of threshold useage is to gate the input of the block to
* output 0 of the block. This happens as part of the class update and requires
* no .ino action. The control comes from the function
* thresholds(levelAbs, levelRel). Setting either levelbs or levelRel to zero
* removes that measure from the gating process. So, a typical function call
* would be detCTCSS.thresholds(0.0f, 0.4f);
*
* This class uses decimation-by-16 to improve the performance of the low-frequency
* filtering and to reduce processing load. The filter parameters of the decimation
* LPF can be used at any sampling rate from 44 to 100 kHz. Other rates will need
* a new design for the LPF. See the discussion below for "iirLpfCoeffs" showing
* how to design such a filter.
*
* The bandpass filter to cover 67 to 254 Hz is predesigned for sample rates near
* 44, 48, 96 or 100 kHz. The discussion below "BPF iir Coefficients" has
* information for designing BPF for other sample rates. The new design is entered
* via the function setCTCSS_BP(float *filterCoeffs).
*
* Each update of an 128-input block takes about 42 uSec on a Teensy 3.6.
*
* Note - Pieces of this support block sizes other than 128, but not all.
* Work needs to be done to implement and test variable block size. The same is
* true for sample rates outside the 44.1 to 100 kHz range.
*/
#ifndef analyze_CTCSS_F32_h_
#define analyze_CTCSS_F32_h_
#include "Arduino.h"
#include "AudioStream_F32.h"
class analyze_CTCSS_F32 : public AudioStream_F32
{
//GUI: inputs:1, outputs:1 //this line used for automatic generation of GUI node
//GUI: shortName:DetCTCSS
public:
analyze_CTCSS_F32(void)
: AudioStream_F32(1, inputQueueArray_f32) {
sample_rate_Hz = AUDIO_SAMPLE_RATE;
block_size = AUDIO_BLOCK_SAMPLES;
initCTCSS();
}
// Option of AudioSettings_F32 change to block size and/or sample rate:
analyze_CTCSS_F32(const AudioSettings_F32 &settings) : AudioStream_F32(1,inputQueueArray_f32){
sample_rate_Hz = settings.sample_rate_Hz;
block_size = settings.audio_block_samples;
initCTCSS();
}
void initCTCSS(void)
{
frequency(103.5f, 300.0f); // Defaults
setNotchX4(103.5f);
// Initialize BiQuad instance (ARM DSP Math Library)
//https://www.keil.com/pack/doc/CMSIS/DSP/html/group__BiquadCascadeDF1.html
arm_biquad_cascade_df1_init_f32(&iir_lpf_inst, 2, &iirLpfCoeffs[0], &StateLpf32[0]);
arm_biquad_cascade_df1_init_f32(&iir_bpf_inst, 4, iirBpfCoeffs, &StateBpf32[0]);
for (int i=0; i<8; i++)
{
d16a[i] = 0.0f;
d16b[i] = 0.0f;
}
arm_biquad_cascade_df1_init_f32(&iir_nulls_inst, 4, &iirNullsCoeffs[0], &StateNullsF32[0]);
thresholds(0.1f, 1.0f);
gEnabled = true;
setCTCSS_BP(NULL); // May be invalid if Sample rate is not provided for here.
}
// Set frequency and length of Goertzel in Hz and milliseconds.
void frequency(float freq) { // Defaults to 300 mSec
frequency(freq, 300.0f);
}
void frequency(float freq, float tMeas) {
// e.g. freq=103.5, tMeas=250, sample_rate_Hz = 44100, gLength=689
gLength = (uint16_t)(0.5 + sample_rate_Hz*tMeas/(1000.0f*16)); // reinstated
// Now set the notch filters for the four-biquad notch filters
setNotchX4(freq);
// and the sub-audible general BP filter
setCTCSS_BP(NULL);
// e.g., freq=103.5, sample_rate_Hz=44100, gCoefficient=2*cos(0.23594)=1.944634
gCoefficient = 2.0f*cosf(6.28318530718f*16.0f*freq/sample_rate_Hz);
// Another constant for ending calculation is exp(-j 2*pi*16*freq*(glength-1)/sample_rate_Hz)
ccRe = cos(6.28318530718f*16.0f*freq/sample_rate_Hz);
ccIm = -sin(6.28318530718f*16.0f*freq/sample_rate_Hz);
}
bool available(void) {
__disable_irq();
bool flag = new_output;
if(flag)
new_output = false; // Prevent multiple reads of same data
__enable_irq();
return flag;
}
float readTonePower(void) { return powerTone; }
float readRefPower(void) { return powerRef; }
const uint16_t isAbsThreshold=1;
const uint16_t isRelThreshold=2;
const uint16_t isBothThreshold=3;
bool readTonePresent(uint16_t what) {
if(what == isAbsThreshold)
return (powerTone>threshAbs);
else if(what == isRelThreshold)
return (powerTone>threshRel*powerRef);
else if(what == isBothThreshold)
return (powerTone>threshAbs && powerTone>threshRel*powerRef);
else return false; // Something was wrong about call
}
void thresholds(float levelAbs, float levelRel) {
// The absolute threshold is compared with tonePower
if (levelAbs < 0.000001f) threshAbs = 0.000001f;
else threshAbs = levelAbs;
// The relative threshold is multiples of refPower
if (levelRel < 0.000001f) threshRel = 0.000001f;
else threshRel = levelRel;
}
operator bool(); // true if at or above threshold, false if below
virtual void update(void);
/* The bandpass filter covers 67 to 254 Hz to allow a comparison
* measurement for the tone. This changes with sample rate. Four
* precomputed filters are provided for 44.1, 48, 96 and 100 kHz.
* Supply a NULL for the filterCoeffs to use these 4.
* filterCoeffs points to an array of 20 floats that are IIR
* coefficients for four BiQuad Stages. To use caller supplied
* filter coefficients, call with a pointer to that 4x BiQuad filter at
* filterCoeffs.
*/
float* setCTCSS_BP(float *filterCoeffs)
{
if(filterCoeffs == NULL)
{
if(sample_rate_Hz>43900.0f && sample_rate_Hz<44200.0f)
iirBpfCoeffs = coeff32bp44;
else if(sample_rate_Hz>47900.0f && sample_rate_Hz<48100.0f)
iirBpfCoeffs = coeff32bp48;
else if(sample_rate_Hz>95800.0f && sample_rate_Hz<96200.0f)
iirBpfCoeffs = coeff32bp96;
else if(sample_rate_Hz>99800.0f && sample_rate_Hz<100200.0f)
iirBpfCoeffs = coeff32bp100;
else return NULL;
}
else iirBpfCoeffs = filterCoeffs; // Caller supplied
return iirBpfCoeffs;
}
/* To use a windowing fuction to change the Goertzel sidelobe levels,
* in the .ino compute half the window function and put that in an array.
* Call this function with a pointer to that array. To stop windowing,
* call this function with NULL as an argument.
* / Windowing not yet implemented <<<-------------------
void setGWindow(float *pWinCoeff)
{
windowCoeff = pWinCoeff; // Point to the caller supplied window function
if(pWinCoeff != NULL)
nWindow = (uint16_t)(0.5f + sample_rate_Hz*tMeas/(2.0f*1000.0f*16.0f));
else
nWindow = 0;
}
*/
private:
int16_t count16 = 0; unsigned long cnt = 0UL;
float ccRe=0.0f;
float ccIm=0.0f;
float freq = 103.5f;
float tMeas = 300.0f;
float d16a[8]; // Small data blocks, after decimation
float d16b[8];
float gCoefficient = 1.9f; // Goertzel algorithm coefficient
float gs1, gs2; // Goertzel algorithm state
float out1, out2; // Goertzel algorithm state output
float powerTone;
float powerRef;
uint16_t gLength; // number of samples to analyze
uint16_t gCount; // how many left to analyze
float powerSum = 0.0f;
uint16_t powerSumCount = 0;
float threshAbs = 0.1f; // absolute threshold, 0.01 to 0.99
float threshRel = 1.0f; // noise relative threshold
bool gEnabled = false;
volatile bool new_output = false;
audio_block_f32_t *inputQueueArray_f32[1];
float sample_rate_Hz = AUDIO_SAMPLE_RATE;
uint16_t block_size = 128;
float iirNullsCoeffs[20];
float *iirBpfCoeffs;
// windowCoeff needs to store half of values (symmetry) for up to
// 0.25 second at 100KHz sample rate, or 0.25*0.5*100000/16=782 pts.
// This is extravagant and needs to be in caller area to allow
// frugality when there is no window at all.
// float *windowCoeff; <<- Windowing is not currently implemented
// uint16_t nWindow = 0; <<- ditto
/* Info - The structure from arm_biquad_casd_df1_inst_f32 instance consists of
* uint32_t numStages;
* const float32_t *pCoeffs; //Points to the array of coefficients, length 5*numStages.
* float32_t *pState; //Points to the array of state variables, length 4*numStages.
* We have 3 IIR's:
*/
arm_biquad_casd_df1_inst_f32 iir_lpf_inst;
arm_biquad_casd_df1_inst_f32 iir_bpf_inst;
arm_biquad_casd_df1_inst_f32 iir_nulls_inst;
/* Each Biquad stage has 4 state variables x[n-1], x[n-2], y[n-1], and y[n-2].
* See https://www.keil.com/pack/doc/CMSIS/DSP/html/group__BiquadCascadeDF1.html
* The state variables are arranged in the pState array as:
* {x[n-1], x[n-2], y[n-1], y[n-2]}
* The 4 state variables for stage 1 are first, then the 4 state variables for stage 2,
* and so on. The state array has a total length of 4*numStages values.
* The state variables are updated after each block of data is processed; the
* coefficients are untouched.
*/
float StateLpf32[2*4];
float StateBpf32[4*4];
float StateNullsF32[4*4];
/*
* LPF for decimation before CTCSS tone detector.
* Pick cutoff frequency to pass 254 Hz with fs=44.1kHz
* or fc=2*254/44100=0.01152. This passes highest tone
* frequency at the lowest sample rate. Octave code:
* FSample = 44100;
* halfFSample = 0.5 * FSample
* [z,p,g] = ellip(4,0.1,60,254/halfFSample);
* sos = zp2sos(z,p,g);
* sos1 = sos(1:1,:) % 1st row
* sos2 = sos(2:2,:) % 2nd row
* % This puts the stop band at 0.02*fs or for fs=100 KHz
* % at 2 kHz. This, in turn, supports an 4 kHz
* % sampling rate after decimation. Thus a single LPF design
* % can be used for sample rates from 44.1 to 100 kHz.
* % See notes below on how to convert Octave output to coefficients:
*/
float iirLpfCoeffs[10] = // See lp1ForCtcss.gif
{9.937058251573265e-04f, -1.898847656031816e-03f, 9.937058251573265e-04f,
1.953233139252097e+00f, -9.540781328043288e-01f,
1.000000000000000e+00f, -1.983872743032985e+00f, 9.999999999999998e-01f,
1.980584507653506e+00f, -9.822943824311938e-01f};
/* There is a band pass filter that is used after decimation to limit the
* spectrum that is seen by the CTCSS detector to (67, 254) Hz. This
* provides the entire CTCSS band to compare against to see if any other
* tones are present. It also restricts the amount of voice spectrum
* presented to the CTCSS detector. This filter is sample rate dependent
* this routine allows for four different "built-in" rates.
*
* Sample LPF Decimation CTCSS BPF
* Rate Fco Ratio Samp Rate Name
* ------- ------ -------- -------- -----
* 44.1kHz 254Hz 16 2756.2Hz BP44
* 48.0kHz 276Hz 16 3000.0Hz BP48
* 96.0kHz 553Hz 16 6000.0Hz BP96
* 100kHz 576Hz 16 6250.0Hz BP100
*
* The following allow computing a bandpass filter for any sample rate in
* the 44 to 100 kHz range (gnu octave script).
*
% ===================== BPF iir Coefficients =============================
% This GNU Octave m script will generate the BPF iir coefficients
% for other sample rates than the four listed here. It will probably
% run under Matlab, but that is untested.
%
format long e
FSample = 6250.0;
halfFSample = 0.5 * FSample
[z,p,g] = ellip(4,0.1,60,[67 254]/halfFSample);
sos = zp2sos(z,p,g);
sos1 = sos(1:1,:) % 1st row
sos2 = sos(2:2,:) % 2nd row
sos3 = sos(3:3,:) % 3rd row
sos4 = sos(4:4,:) % 4th row
%
% sos are the "Second Order State" (BiQuad) consisting of 4 sets of 6 numbers.
% These are numerator and denominator in form of the Open Audio Matlab
% IIR function setFilterCoeff_Matlab(float32_t b[], float32_t a[])
% in AudioFilterIIR_F32.h of
% https://github.com/chipaudette/OpenAudio_ArduinoLibrary/blob/master/AudioFilterIIR_F32.h
%
% sosi, i=1 to 4, are each 6 double precision numbers, a0, a1, a2,
% b0, b1, b2. To use these with the ARM library,
% arm_biquad_cascade_df1_f32, two changes are needed. The fourth
% number is a0 that is always 1.000 and for the arm routine, it is omitted.
% The fifth and sixth numbers are -a1 and -a2, so they need to have their
% signs reversed. So, for example, for the 44.1 kHz sample rate:
% sos1 =
% 4.386558177463118e-03 4.835083945591431e-03 4.386558177463117e-03
% 1.000000000000000e+00 -1.503280453219001e+00 8.498498588788136e-01%
% sos2 =
% 1.000000000000000e+00 -4.234328155653108e-01 1.000000000000000e+00
% 1.000000000000000e+00 -1.524529304401012e+00 6.838502689975459e-01
% sos3 =
% 1.000000000000000e+00 -1.996808089693871e+00 9.999999999999998e-01
% 1.000000000000000e+00 -1.797650895821358e+00 8.356641238925192e-01
% sos4 =
% 1.000000000000000e+00 -1.999398698654737e+00 1.000000000000000e+00
% 1.000000000000000e+00 -1.941833848024410e+00 9.614543316508065e-01
% and the resulting arm coefficient array, including all 4 biquads, is
% coeff32BP44[20] = {
% 4.386558177463118e-03, 4.835083945591431e-03, 4.386558177463117e-03,
% 1.503280453219001e+00, -8.498498588788136e-01,
% 1.000000000000000e+00, -4.234328155653108e-01, 1.000000000000000e+00,
% 1.524529304401012e+00, -6.838502689975459e-01,
% 1.000000000000000e+00, -1.996808089693871e+00, 9.999999999999998e-01,
% 1.797650895821358e+00, -8.356641238925192e-01,
% 1.000000000000000e+00, -1.999398698654737e+00, 1.000000000000000e+00,
% 1.941833848024410e+00, -9.614543316508065e-01};
%
*/
// The four predefined bandpass filters:
// BP44 Decimated fSample = 2756.2 Hz
float coeff32bp44[20] = {
4.386558177463118e-03f, 4.835083945591431e-03f, 4.386558177463117e-03f,
1.503280453219001e+00f, -8.498498588788136e-01f,
1.000000000000000e+00f, -4.234328155653108e-01f, 1.000000000000000e+00f,
1.524529304401012e+00f, -6.838502689975459e-01f,
1.000000000000000e+00f, -1.996808089693871e+00f, 9.999999999999998e-01f,
1.797650895821358e+00f, -8.356641238925192e-01f,
1.000000000000000e+00f, -1.999398698654737e+00f, 1.000000000000000e+00f,
1.941833848024410e+00f, -9.614543316508065e-01f};
// BP48 Decimated fSample = 3000 Hz
float coeff32bp48[20] = {
3.764439090680418e-03f, 3.650362666517592e-03f, 3.764439090680417e-03f,
1.000000000000000e+00f, -5.926113222413726e-01f, 1.000000000000000e+00f,
1.569400123464342e+00f, -7.055760636246757e-01f,
1.000000000000000e+00f, -1.997300534603388e+00f, 9.999999999999998e-01f,
1.816002936969042e+00f, -8.483092827984080e-01f,
1.000000000000000e+00f, -1.999491318923814e+00f, 1.000000000000000e+00f,
1.947984087804752e+00f, -9.645809301964445e-01f};
// BP96 Decimated fSample = 6000 Hz
float coeff32bp96[20] = {
1.554430361573611e-03f, 5.765630035510897e-04f, 1.554430361573611e-03f,
1.803990601116592e+00f, -8.406882700444890e-01f,
1.000000000000000e+00f, -1.541034615722940e+00f, 9.999999999999998e-01f,
1.846550880066576e+00f, -9.250235034256622e-01f,
1.000000000000000e+00f, -1.999319784384852e+00f, 9.999999999999998e-01f,
1.913429616511321e+00f, -9.218266406823739e-01f,
1.000000000000000e+00f, -1.999871669777634e+00f, 1.000000000000000e+00f,
1.978038062492293e+00f, -9.822341038950552e-01f};
// BP100 Decimated fSample = 6250 Hz
float coeff32bp100[20] = {
1.504180063396739e-03f, -6.773089598829345e-04f, 1.504180063396738e-03f,
1.812635069874353e+00f, -8.465624856328144e-01f,
1.000000000000000e+00f, -1.573630872142354e+00f, 1.000000000000000e+00f,
1.855377871833802e+00f, -9.278512110118003e-01f,
1.000000000000000e+00f, -1.999372984381045e+00f, 9.999999999999998e-01f,
1.917101697268557e+00f, -9.248525551899550e-01f,
1.000000000000000e+00f, -1.999881702874664e+00f, 1.000000000000000e+00f,
1.979072537983060e+00f, -9.829412184208248e-01f};
/* Designs a four-notch filter to null out a tone. At 100 Hz the
* null width of the four staggered tones is about 2Hz wide.
* iirNullsCoeffs is a pointer to an array of 20 floats. The nulls
* filter is always designed here and there is no need for
* caller-designed filters.
*/
void setNotchX4(float frequency)
{
float kf[] = {0.9955f, 0.9982f, 1.0018f, 1.0045f}; // Offset ratios
float Q = 60.0f;
float w0, sinW0, alpha, cosW0, scale;
for (int ii = 0; ii<4; ii++) // Over 4 cascaded BiQuad filters
{
w0 = kf[ii]*frequency*(2.0f*3.141592654f*16.0f / sample_rate_Hz);
sinW0 = sin(w0);
alpha = sinW0 / (Q * 2.0f);
cosW0 = cos(w0);
scale = 1.0f / (1.0f+alpha);
/* b0 */ iirNullsCoeffs[5*ii + 0] = scale;
/* b1 */ iirNullsCoeffs[5*ii + 1] = -2.0f * cosW0 * scale;
/* b2 */ iirNullsCoeffs[5*ii + 2] = scale;
/* a0 always 1.0f */
/* a1 */ iirNullsCoeffs[5*ii + 3] = 2.0f * cosW0 * scale;
/* a2 */ iirNullsCoeffs[5*ii + 4] = -(1.0f - alpha) * scale;
}
}
};
#endif

122
keywords.txt
Unescape View File

@ -7,6 +7,72 @@ audio_block_f32_t KEYWORD1
AudioStream_F32 KEYWORD1
AudioConnection_F32 KEYWORD1
AudioAnalyzeFFT256_IQ_F32 KEYWORD1
windowFunction KEYWORD2
getData KEYWORD2
getWindow KEYWORD2
putWindow KEYWORD2
setOutputType KEYWORD2
setNAverage KEYWORD2
setXAxis KEYWORD2
AudioAnalyzeFFT1024_F32 KEYWORD1
AudioAnalyzeFFT2048_F32 KEYWORD1
AudioAnalyzeFFT4096_F32 KEYWORD1
AudioAnalyzePeak_F32 KEYWORD1
readPeakToPeak KEYWORD2
AudioAnalyzePhase_F32 KEYWORD1
setAnalyzePhaseConfig
AudioAnalyzeToneDetect_F32 KEYWORD1
threshold KEYWORD2
set_params KEYWORD2
AudioAnalyzeRMS_F32 KEYWORD1
showError KEYWORD1
AudioCalcEnvelope_F32 KEYWORD1
smooth_env KEYWORD2
setAttackRelease_msec KEYWORD2
setDefaultValues KEYWORD2
setSampleRate_Hz KEYWORD2
resetStates KEYWORD2
getCurrentLevel KEYWORD2
AudioCalcGainDecWDRC_F32 KEYWORD1
calcGainFromEnvelope KEYWORD2
WDRC_circuit_gain KEYWORD2
setDefaultValues KEYWORD2
setParams_from_CHA_WDRC KEYWORD2
setGain_dB KEYWORD2
incrementGain_dB KEYWORD2
getCurrentGain KEYWORD2
getCurrentGain_dB KEYWORD2
setDecimationFactor KEYWORD2
setMaxdB KEYWORD2
getMaxdB KEYWORD2
setKneeExpansion_dBSPL KEYWORD2
getKneeExpansion_dBSPL KEYWORD2
setExpansionCompRatio KEYWORD2
getExpansionCompRatio KEYWORD2
setKneeCompressor_dBSPL KEYWORD2
getKneeCompressor_dBSPL KEYWORD2
setCompRatio KEYWORD2
getCompRatio KEYWORD2
setKneeLimiter_dBSPL KEYWORD2
getKneeLimiter_dBSPL KEYWORD2
undb KEYWORD2
db2 KEYWORD2
log2f_approx KEYWORD2
AudioCalcGainWDRC_F32 KEYWORD1
AudioConfigFIRFilterBank_F32 KEYWORD1
createFilterCoeff KEYWORD2
computeLogSpacedCornerFreqs KEYWORD2
AudioControlTLV320AIC3206 KEYWORD1
inputSelect KEYWORD2
setMicBias KEYWORD2
@ -15,7 +81,8 @@ volume_dB KEYWORD2
setInputGain_dB KEYWORD2
AudioControlSGTL5000_Extended KEYWORD1
micBiasEnable KEYWORD2
micBiasEnable KEYWORD2
micBiasDisable KEYWORD2
AudioConvert_I16toF32 KEYWORD1
AudioConvert_F32toI16 KEYWORD1
@ -23,7 +90,28 @@ AudioConvert_F32toI16 KEYWORD1
AudioEffectGain_F32 KEYWORD1
setGain_dB KEYWORD2
analyze_CTCSS_F32 KEYWORD1
initCTCSS KEYWORD2
readTonePower KEYWORD2
readRefPower KEYWORD2
readTonePresent KEYWORD2
thresholds KEYWORD2
setCTCSS_BP KEYWORD2
AudioFilterBiquad_F32 KEYWORD1
doClassInit KEYWORD2
setCoefficients KEYWORD2
setBlockDC KEYWORD2
setFilterCoeff_Matlab KEYWORD2
setLowpass KEYWORD2
setHighpass KEYWORD2
setBandpass KEYWORD2
setNotch KEYWORD2
AudioFilterFIR_F32 KEYWORD1
setSampleRate_Hz KEYWORD2
setBlockLength KEYWORD2
AudioEffectIIR_F32 KEYWORD1
AudioEffectCompressor_F32 KEYWORD1
AudioInputI2S_F32 KEYWORD1
@ -31,13 +119,32 @@ AudioMemory_F32 KEYWORD1
AudioMemoryUsage_F32 KEYWORD1
AudioMemoryUsageMax_F32 KEYWORD1
AudioMemoryUsageMaxReset_F32 KEYWORD1
AudioMixer4_F32 KEYWORD1
gain KEYWORD2
AudioMultiply_F32 KEYWORD1
AudioOutputI2S_F32 KEYWORD1
AudioPlayQueue_F32 KEYWORD1
AudioRecordQueue_F32 KEYWORD1
begin KEYWORD1
clear KEYWORD1
available KEYWORD1
readBuffer KEYWORD1
freeBuffer KEYWORD1
end KEYWORD1
AudioSynthGaussian_F32 KEYWORD1
AudioSynthNoiseWhite_F32 KEYWORD1
AudioSynthNoisePink_F32 KEYWORD1
AudioSynthSineCosine_F32 KEYWORD1
phase_r KEYWORD2
phaseS_C_r KEYWORD2
simple KEYWORD2
AudioSynthWaveform_F32 KEYWORD1
@ -46,4 +153,17 @@ frequency KEYWORD2
phase KEYWORD2
amplitude KEYWORD2
RadioFMDetector_F32 KEYWORD1
filterIQ KEYWORD2
filterOut KEYWORD2
setSquelchFilter KEYWORD2
getSquelchLevel KEYWORD2
setSquelchDecay KEYWORD2
setSquelchThreshold KEYWORD2
showError KEYWORD2
returnInitializeFMError KEYWORD2
radioModulatedGenerator_F32 KEYWORD1
setFMScale KEYWORD2
amplitudeQI KEYWORD2
doModulation_AM_PM_FM KEYWORD2

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