wirtz
/
OpenAudio_ArduinoLibrary
mirror of https://github.com/chipaudette/OpenAudio_ArduinoLibrary.git
1
0
Fork 0
Code Issues Releases Wiki Activity

Move FFT examples from Tympan

Browse Source
pull/11/head
boblark 4 years ago
parent fb807bbec6
commit 13eb4a3545
9 changed files with 219 additions and 241 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 219
      examples/FormantShifter_FD/FormantShifter_FD.ino
  2. 24
      examples/FormantShifter_FD_OA/AudioEffectFormantShiftFD_OA_F32.h
  3. 196
      examples/FormantShifter_FD_OA/FormantShifter_FD_OA.ino
  4. 16
      examples/FormantShifter_FD_OA/SerialManagerFormant_OA.h
  5. 0
      examples/FrequencyShifter_FD_OA/FrequencyShifter_OA_FD.ino
  6. 0
      examples/FrequencyShifter_FD_OA/SerialManager_Shift_OA.h
  7. 0
      examples/LowpassFilter_FD_OA/AudioEffectLowpassFD_OA_F32.h
  8. 3
      examples/LowpassFilter_FD_OA/LowpassFilter_FD_OA.ino
  9. 2
      readme.md

219
examples/FormantShifter_FD/FormantShifter_FD.ino
Unescape View File

@ -1,219 +0,0 @@
// FormantShifter_FD
//
// Demonstrate formant shifting via frequency domain processin.
//
// Created: Chip Audette (OpenAudio) March 2019
//
// Approach:
// * Take samples in the time domain
// * Take FFT to convert to frequency domain
// * Manipulate the frequency bins to do the formant shifting
// * Take IFFT to convert back to time domain
// * Send samples back to the audio interface
//
// The amount of formant shifting is controled via the Serial link.
// It defaults to a modest upward shifting of the formants
//
// Built for the Tympan library for Teensy 3.6-based hardware
//
// MIT License. Use at your own risk.
//
#include <Tympan_Library.h>
#include "AudioEffectFormantShiftFD_F32.h" //the local file holding your custom function
#include "SerialManager.h"
//set the sample rate and block size
const float sample_rate_Hz = 44117.f; ; //24000 or 44117 (or other frequencies in the table in AudioOutputI2S_F32)
const int audio_block_samples = 128; //for freq domain processing choose a power of 2 (16, 32, 64, 128) but no higher than 128
AudioSettings_F32 audio_settings(sample_rate_Hz, audio_block_samples);
//create audio library objects for handling the audio
Tympan audioHardware(TympanRev::D); //do TympanRev::C or TympanRev::D
AudioInputI2S_F32 i2s_in(audio_settings); //Digital audio *from* the Tympan AIC.
AudioEffectFormantShiftFD_F32 formantShift(audio_settings); //create the frequency-domain processing block
AudioEffectGain_F32 gain1; //Applies digital gain to audio data.
AudioOutputI2S_F32 i2s_out(audio_settings); //Digital audio out *to* the Tympan AIC.
//Make all of the audio connections
AudioConnection_F32 patchCord1(i2s_in, 0, formantShift, 0); //use the Left input
AudioConnection_F32 patchCord2(formantShift, 0, gain1, 0); //connect to gain
AudioConnection_F32 patchCord3(gain1, 0, i2s_out, 0); //connect to the left output
AudioConnection_F32 patchCord4(gain1, 0, i2s_out, 1); //connect to the right output
//control display and serial interaction
bool enable_printCPUandMemory = false;
void togglePrintMemoryAndCPU(void) { enable_printCPUandMemory = !enable_printCPUandMemory; };
SerialManager serialManager(audioHardware);
#define mySerial audioHardware //audioHardware is a printable stream!
//inputs and levels
float input_gain_dB = 20.0f; //gain on the microphone
float formant_shift_gain_correction_dB = 0.0; //will be used to adjust for gain in formant shifter
float vol_knob_gain_dB = 0.0; //will be overridden by volume knob
void switchToPCBMics(void) {
mySerial.println("Switching to PCB Mics.");
audioHardware.inputSelect(TYMPAN_INPUT_ON_BOARD_MIC); // use the microphone jack - defaults to mic bias OFF
audioHardware.setInputGain_dB(input_gain_dB);
}
void switchToLineInOnMicJack(void) {
mySerial.println("Switching to Line-in on Mic Jack.");
audioHardware.inputSelect(TYMPAN_INPUT_JACK_AS_LINEIN); // use the microphone jack - defaults to mic bias OFF
audioHardware.setInputGain_dB(0.0);
}
void switchToMicInOnMicJack(void) {
mySerial.println("Switching to Mic-In on Mic Jack.");
audioHardware.inputSelect(TYMPAN_INPUT_JACK_AS_MIC); // use the microphone jack - defaults to mic bias OFF
audioHardware.setInputGain_dB(input_gain_dB);
}
// define the setup() function, the function that is called once when the device is booting
void setup() {
audioHardware.beginBothSerial(); delay(1000);
mySerial.println("FormantShifter: starting setup()...");
mySerial.print(" : sample rate (Hz) = "); mySerial.println(audio_settings.sample_rate_Hz);
mySerial.print(" : block size (samples) = "); mySerial.println(audio_settings.audio_block_samples);
// Audio connections require memory to work. For more
// detailed information, see the MemoryAndCpuUsage example
AudioMemory_F32(40, audio_settings);
// Configure the frequency-domain algorithm
int overlap_factor = 4; //set to 4 or 8 or either 75% overlap (4x) or 87.5% overlap (8x)
int N_FFT = audio_block_samples * overlap_factor;
formantShift.setup(audio_settings, N_FFT); //do after AudioMemory_F32();
formantShift.setScaleFactor(1.5); //1.0 is no formant shifting.
if (overlap_factor == 4) {
formant_shift_gain_correction_dB = -3.0;
} else if (overlap_factor == 8) {
formant_shift_gain_correction_dB = -9.0;
}
//Enable the Tympan to start the audio flowing!
audioHardware.enable(); // activate AIC
//setup DC-blocking highpass filter running in the ADC hardware itself
float cutoff_Hz = 60.0; //set the default cutoff frequency for the highpass filter
audioHardware.setHPFonADC(true,cutoff_Hz,audio_settings.sample_rate_Hz); //set to false to disble
//Choose the desired input
switchToPCBMics(); //use PCB mics as input
//switchToMicInOnMicJack(); //use Mic jack as mic input (ie, with mic bias)
//switchToLineInOnMicJack(); //use Mic jack as line input (ie, no mic bias)
//Set the desired volume levels
audioHardware.volume_dB(0); // headphone amplifier. -63.6 to +24 dB in 0.5dB steps.
// configure the blue potentiometer
servicePotentiometer(millis(),0); //update based on the knob setting the "0" is not relevant here.
//finish the setup by printing the help menu to the serial connections
serialManager.printHelp();
}
// define the loop() function, the function that is repeated over and over for the life of the device
void loop() {
//respond to Serial commands
while (Serial.available()) serialManager.respondToByte((char)Serial.read()); //USB Serial
//while (Serial1.available()) serialManager.respondToByte((char)Serial1.read()); //BT Serial
//check the potentiometer
servicePotentiometer(millis(), 100); //service the potentiometer every 100 msec
//check to see whether to print the CPU and Memory Usage
if (enable_printCPUandMemory) printCPUandMemory(millis(), 3000); //print every 3000 msec
} //end loop();
// ///////////////// Servicing routines
//servicePotentiometer: listens to the blue potentiometer and sends the new pot value
// to the audio processing algorithm as a control parameter
void servicePotentiometer(unsigned long curTime_millis, const unsigned long updatePeriod_millis) {
//static unsigned long updatePeriod_millis = 100; //how many milliseconds between updating the potentiometer reading?
static unsigned long lastUpdate_millis = 0;
static float prev_val = -1.0;
//has enough time passed to update everything?
if (curTime_millis < lastUpdate_millis) lastUpdate_millis = 0; //handle wrap-around of the clock
if ((curTime_millis - lastUpdate_millis) > updatePeriod_millis) { //is it time to update the user interface?
//read potentiometer
float val = float(audioHardware.readPotentiometer()) / 1023.0; //0.0 to 1.0
val = (1.0/9.0) * (float)((int)(9.0 * val + 0.5)); //quantize so that it doesn't chatter...0 to 1.0
//use the potentiometer value to control something interesting
if (abs(val - prev_val) > 0.05) { //is it different than befor?
prev_val = val; //save the value for comparison for the next time around
#if 0
//set the volume of the system
setVolKnobGain_dB(val*45.0f - 10.0f - input_gain_dB);
#else
//set the amount of formant shifting
float new_scale_fac = powf(2.0,(val-0.5)*2.0);
formantShift.setScaleFactor(new_scale_fac);
#endif
}
lastUpdate_millis = curTime_millis;
} // end if
} //end servicePotentiometer();
//This routine prints the current and maximum CPU usage and the current usage of the AudioMemory that has been allocated
void printCPUandMemory(unsigned long curTime_millis, unsigned long updatePeriod_millis) {
//static unsigned long updatePeriod_millis = 3000; //how many milliseconds between updating gain reading?
static unsigned long lastUpdate_millis = 0;
//has enough time passed to update everything?
if (curTime_millis < lastUpdate_millis) lastUpdate_millis = 0; //handle wrap-around of the clock
if ((curTime_millis - lastUpdate_millis) > updatePeriod_millis) { //is it time to update the user interface?
mySerial.print("printCPUandMemory: ");
mySerial.print("CPU Cur/Peak: ");
mySerial.print(audio_settings.processorUsage());
//mySerial.print(AudioProcessorUsage()); //if not using AudioSettings_F32
mySerial.print("%/");
mySerial.print(audio_settings.processorUsageMax());
//mySerial.print(AudioProcessorUsageMax()); //if not using AudioSettings_F32
mySerial.print("%, ");
mySerial.print("Dyn MEM Float32 Cur/Peak: ");
mySerial.print(AudioMemoryUsage_F32());
mySerial.print("/");
mySerial.print(AudioMemoryUsageMax_F32());
mySerial.println();
lastUpdate_millis = curTime_millis; //we will use this value the next time around.
}
}
void printGainSettings(void) {
mySerial.print("Gain (dB): ");
mySerial.print("Vol Knob = "); mySerial.print(vol_knob_gain_dB,1);
//mySerial.print(", Input PGA = "); mySerial.print(input_gain_dB,1);
mySerial.println();
}
void incrementKnobGain(float increment_dB) { //"extern" to make it available to other files, such as SerialManager.h
setVolKnobGain_dB(vol_knob_gain_dB+increment_dB);
}
void setVolKnobGain_dB(float gain_dB) {
vol_knob_gain_dB = gain_dB;
gain1.setGain_dB(vol_knob_gain_dB+formant_shift_gain_correction_dB);
printGainSettings();
}
float incrementFormantShift(float incr_factor) {
float cur_scale_factor = formantShift.getScaleFactor();
return formantShift.setScaleFactor(cur_scale_factor*incr_factor);
}

24
examples/FormantShifter_FD/AudioEffectFormantShiftFD_F32.h → examples/FormantShifter_FD_OA/AudioEffectFormantShiftFD_OA_F32.h
Unescape View File

@ -1,27 +1,27 @@
#ifndef _AudioEffectFormantShiftFD_F32_h #ifndef _AudioEffectFormantShiftFD_OA_F32_h
#define _AudioEffectFormantShiftFD_F32_h #define _AudioEffectFormantShiftFD_OA_F32_h
#include "AudioStream_F32.h" #include "AudioStream_F32.h"
#include <arm_math.h> #include <arm_math.h>
#include "FFT_Overlapped_F32.h" #include "FFT_Overlapped_F32.h"
class AudioEffectFormantShiftFD_F32 : public AudioStream_F32 class AudioEffectFormantShiftFD_OA_F32 : public AudioStream_F32
{ {
public: public:
//constructors...a few different options. The usual one should be: AudioEffectFormantShiftFD_F32(const AudioSettings_F32 &settings, const int _N_FFT) //constructors...a few different options. The usual one should be: AudioEffectFormantShiftFD_OA_F32(const AudioSettings_F32 &settings, const int _N_FFT)
AudioEffectFormantShiftFD_F32(void) : AudioStream_F32(1, inputQueueArray_f32) {}; AudioEffectFormantShiftFD_OA_F32(void) : AudioStream_F32(1, inputQueueArray_f32) {};
AudioEffectFormantShiftFD_F32(const AudioSettings_F32 &settings) : AudioEffectFormantShiftFD_OA_F32(const AudioSettings_F32 &settings) :
AudioStream_F32(1, inputQueueArray_f32) { AudioStream_F32(1, inputQueueArray_f32) {
sample_rate_Hz = settings.sample_rate_Hz; sample_rate_Hz = settings.sample_rate_Hz;
} }
AudioEffectFormantShiftFD_F32(const AudioSettings_F32 &settings, const int _N_FFT) : AudioEffectFormantShiftFD_OA_F32(const AudioSettings_F32 &settings, const int _N_FFT) :
AudioStream_F32(1, inputQueueArray_f32) { AudioStream_F32(1, inputQueueArray_f32) {
setup(settings, _N_FFT); setup(settings, _N_FFT);
} }
//destructor...release all of the memory that has been allocated //destructor...release all of the memory that has been allocated
~AudioEffectFormantShiftFD_F32(void) { ~AudioEffectFormantShiftFD_OA_F32(void) {
if (complex_2N_buffer != NULL) delete complex_2N_buffer; if (complex_2N_buffer != NULL) delete complex_2N_buffer;
} }
@ -36,17 +36,17 @@ class AudioEffectFormantShiftFD_F32 : public AudioStream_F32
if (N_FFT < 1) return N_FFT; if (N_FFT < 1) return N_FFT;
//decide windowing //decide windowing
Serial.println("AudioEffectFormantShiftFD_F32: setting myFFT to use hanning..."); Serial.println("AudioEffectFormantShiftFD_OA_F32: setting myFFT to use hanning...");
(myFFT.getFFTObject())->useHanningWindow(); //applied prior to FFT (myFFT.getFFTObject())->useHanningWindow(); //applied prior to FFT
#if 1 #if 1
if (myIFFT.getNBuffBlocks() > 3) { if (myIFFT.getNBuffBlocks() > 3) {
Serial.println("AudioEffectFormantShiftFD_F32: setting myIFFT to use hanning..."); Serial.println("AudioEffectFormantShiftFD_OA_F32: setting myIFFT to use hanning...");
(myIFFT.getIFFTObject())->useHanningWindow(); //window again after IFFT (myIFFT.getIFFTObject())->useHanningWindow(); //window again after IFFT
} }
#endif #endif
//print info about setup //print info about setup
Serial.println("AudioEffectFormantShiftFD_F32: FFT parameters..."); Serial.println("AudioEffectFormantShiftFD_OA_F32: FFT parameters...");
Serial.print(" : N_FFT = "); Serial.println(N_FFT); Serial.print(" : N_FFT = "); Serial.println(N_FFT);
Serial.print(" : audio_block_samples = "); Serial.println(settings.audio_block_samples); Serial.print(" : audio_block_samples = "); Serial.println(settings.audio_block_samples);
Serial.print(" : FFT N_BUFF_BLOCKS = "); Serial.println(myFFT.getNBuffBlocks()); Serial.print(" : FFT N_BUFF_BLOCKS = "); Serial.println(myFFT.getNBuffBlocks());
@ -87,7 +87,7 @@ class AudioEffectFormantShiftFD_F32 : public AudioStream_F32
}; };
void AudioEffectFormantShiftFD_F32::update(void) void AudioEffectFormantShiftFD_OA_F32::update(void)
{ {
//get a pointer to the latest data //get a pointer to the latest data
audio_block_f32_t *in_audio_block = AudioStream_F32::receiveReadOnly_f32(); audio_block_f32_t *in_audio_block = AudioStream_F32::receiveReadOnly_f32();

196
examples/FormantShifter_FD_OA/FormantShifter_FD_OA.ino
Unescape View File

@ -0,0 +1,196 @@
/* FormantShifter_FD.ino
*
* Demonstrate formant shifting via frequency domain processin.
*
* Created: Chip Audette (OpenAudio) March 2019
*
* Approach:
* * Take samples in the time domain
* * Take FFT to convert to frequency domain
* * Manipulate the frequency bins to do the formant shifting
* * Take IFFT to convert back to time domain
* * Send samples back to the audio interface
*
* The amount of formant shifting is controled via the Serial link.
* It defaults to a modest upward shifting of the formants
*
* Built for the Tympan library for Teensy 3.6-based hardware
*
* Adapt to OpenAudio Library - Bob Larkin June 2020
* Ref: http://iris.elf.stuba.sk/JEEEC/data/pdf/1_110-08.pdf
*
* MIT License. Use at your own risk.
*
*/
#include "AudioStream_F32.h"
#include "OpenAudio_ArduinoLibrary.h"
#include "AudioEffectFormantShiftFD_OA_F32.h" //the local file holding your custom function
#include "SerialManager_OA.h"
//set the sample rate and block size
const float sample_rate_Hz = 44117.f; ; //24000 or 44117 (or other frequencies in the table in AudioOutputI2S_F32)
const int audio_block_samples = 128; //for freq domain processing choose a power of 2 (16, 32, 64, 128) but no higher than 128
AudioSettings_F32 audio_settings(sample_rate_Hz, audio_block_samples);
//create audio library objects for handling the audio
AudioInputI2S i2sIn;
AudioConvert_I16toF32 cnvrt1;
AudioEffectFormantShiftFD_F32 formantShift(audio_settings); //create the frequency-domain processing block
AudioEffectGain_F32 gain1; //Applies digital gain to audio data.
AudioConvert_F32toI16 cnvrt2;
AudioOutputI2S i2sOut;
AudioControlSGTL5000 codec;
//Make all of the audio connections
AudioConnection patchCord1(i2sIn, 0, cnvrt1, 0); // connect to Left codec, 16-bit
AudioConnection_F32 patchCord2(cnvrt1, 0, formantShift, 0);
AudioConnection_F32 patchCord2(formantShift, 0, gain1, 0); //connect to gain
AudioConnection_F32 patchCord3(gain1, 0, cnvrt2, 0); //connect to the left output
AudioConnection patchCord6(cnvrt2, 0, i2sOut, 0);
//control display and serial interaction
bool enable_printCPUandMemory = false;
void togglePrintMemoryAndCPU(void) { enable_printCPUandMemory = !enable_printCPUandMemory; };
SerialManager_OA SerialManager_OA(audioHardware);
//inputs and levels
float input_gain_dB = 20.0f; //gain on the microphone
float formant_shift_gain_correction_dB = 0.0; //will be used to adjust for gain in formant shifter
// define the setup() function, the function that is called once when the device is booting
void setup() {
Serial.begin(1); delay(1000);
mySerial.println("FormantShifter: starting setup()...");
mySerial.print(" : sample rate (Hz) = "); mySerial.println(audio_settings.sample_rate_Hz);
mySerial.print(" : block size (samples) = "); mySerial.println(audio_settings.audio_block_samples);
// Audio connections require memory to work. For more
// detailed information, see the MemoryAndCpuUsage example
AudioMemory(3); // I16 type
AudioMemory_F32(40, audio_settings);
// Configure the frequency-domain algorithm
int overlap_factor = 4; //set to 4 or 8 or either 75% overlap (4x) or 87.5% overlap (8x)
int N_FFT = audio_block_samples * overlap_factor;
formantShift.setup(audio_settings, N_FFT); //do after AudioMemory_F32();
formantShift.setScaleFactor(1.5); //1.0 is no formant shifting.
if (overlap_factor == 4) {
formant_shift_gain_correction_dB = -3.0;
} else if (overlap_factor == 8) {
formant_shift_gain_correction_dB = -9.0;
}
codec.enable(); // activate AIC
//setup DC-blocking highpass filter running in the ADC hardware itself
//Choose the desired input
//Set the desired volume levels
audioHardware.volume_dB(0); // headphone amplifier. -63.6 to +24 dB in 0.5dB steps.
//finish the setup by printing the help menu to the serial connections
Serial.printHelp();
}
// define the loop() function, the function that is repeated over and over for the life of the device
void loop() {
//respond to Serial commands
while (Serial.available()) SerialManager_OA.respondToByte((char)Serial.read()); //USB Serial
//while (Serial1.available()) SerialManager_OA.respondToByte((char)Serial1.read()); //BT Serial
//check the potentiometer
servicePotentiometer(millis(), 100); //service the potentiometer every 100 msec
//check to see whether to print the CPU and Memory Usage
if (enable_printCPUandMemory) printCPUandMemory(millis(), 3000); //print every 3000 msec
} //end loop();
// ///////////////// Servicing routines
//servicePotentiometer: listens to the blue potentiometer and sends the new pot value
// to the audio processing algorithm as a control parameter
void servicePotentiometer(unsigned long curTime_millis, const unsigned long updatePeriod_millis) {
//static unsigned long updatePeriod_millis = 100; //how many milliseconds between updating the potentiometer reading?
static unsigned long lastUpdate_millis = 0;
static float prev_val = -1.0;
//has enough time passed to update everything?
if (curTime_millis < lastUpdate_millis) lastUpdate_millis = 0; //handle wrap-around of the clock
if ((curTime_millis - lastUpdate_millis) > updatePeriod_millis) { //is it time to update the user interface?
//read potentiometer
float val = float(audioHardware.readPotentiometer()) / 1023.0; //0.0 to 1.0
val = (1.0/9.0) * (float)((int)(9.0 * val + 0.5)); //quantize so that it doesn't chatter...0 to 1.0
#if 0
//set the volume of the system
setVolKnobGain_dB(val*45.0f - 10.0f - input_gain_dB);
#else
//set the amount of formant shifting
float new_scale_fac = powf(2.0,(val-0.5)*2.0);
formantShift.setScaleFactor(new_scale_fac);
#endif
}
lastUpdate_millis = curTime_millis;
} // end if
} //end servicePotentiometer();
//This routine prints the current and maximum CPU usage and the current usage of the AudioMemory that has been allocated
void printCPUandMemory(unsigned long curTime_millis, unsigned long updatePeriod_millis) {
//static unsigned long updatePeriod_millis = 3000; //how many milliseconds between updating gain reading?
static unsigned long lastUpdate_millis = 0;
//has enough time passed to update everything?
if (curTime_millis < lastUpdate_millis) lastUpdate_millis = 0; //handle wrap-around of the clock
if ((curTime_millis - lastUpdate_millis) > updatePeriod_millis) { //is it time to update the user interface?
Serial.print("printCPUandMemory: ");
Serial.print("CPU Cur/Peak: ");
Serial.print(audio_settings.processorUsage());
//Serial.print(AudioProcessorUsage()); //if not using AudioSettings_F32
Serial.print("%/");
Serial.print(audio_settings.processorUsageMax());
//Serial.print(AudioProcessorUsageMax()); //if not using AudioSettings_F32
Serial.print("%, ");
Serial.print("Dyn MEM Float32 Cur/Peak: ");
Serial.print(AudioMemoryUsage_F32());
Serial.print("/");
Serial.print(AudioMemoryUsageMax_F32());
Serial.println();
lastUpdate_millis = curTime_millis; //we will use this value the next time around.
}
}
void printGainSettings(void) {
Serial.print("Gain (dB): ");
Serial.print("Vol Knob = "); Serial.print(vol_knob_gain_dB,1);
//Serial.print(", Input PGA = "); Serial.print(input_gain_dB,1);
Serial.println();
}
void incrementKnobGain(float increment_dB) { //"extern" to make it available to other files, such as SerialManager_OA.h
setVolKnobGain_dB(vol_knob_gain_dB+increment_dB);
}
void setVolKnobGain_dB(float gain_dB) {
vol_knob_gain_dB = gain_dB;
gain1.setGain_dB(vol_knob_gain_dB+formant_shift_gain_correction_dB);
printGainSettings();
}
float incrementFormantShift(float incr_factor) {
float cur_scale_factor = formantShift.getScaleFactor();
return formantShift.setScaleFactor(cur_scale_factor*incr_factor);
}

16
examples/FormantShifter_FD/SerialManager.h → examples/FormantShifter_FD_OA/SerialManagerFormant_OA.h
Unescape View File

@ -1,19 +1,19 @@
#ifndef _SerialManager_h #ifndef _SerialManager_OA_h
#define _SerialManager_h #define _SerialManager_OA_h
#include <Tympan_Library.h> #include <Tympan_Library.h>
//now, define the Serial Manager class //now, define the Serial Manager class
class SerialManager { class SerialManager_OA {
public: public:
public: public:
SerialManager(Tympan &_audioHardware) SerialManager_OA(Tympan &_audioHardware)
: audioHardware(_audioHardware) : audioHardware(_audioHardware)
{ }; { };
//SerialManager(void) //SerialManager_OA(void)
//{ }; //{ };
void respondToByte(char c); void respondToByte(char c);
@ -27,9 +27,9 @@ class SerialManager {
}; };
#define thisSerial audioHardware #define thisSerial audioHardware
void SerialManager::printHelp(void) { void SerialManager_OA::printHelp(void) {
thisSerial.println(); thisSerial.println();
thisSerial.println("SerialManager Help: Available Commands:"); thisSerial.println("SerialManager_OA Help: Available Commands:");
thisSerial.println(" h: Print this help"); thisSerial.println(" h: Print this help");
thisSerial.println(" g: Print the gain settings of the device."); thisSerial.println(" g: Print the gain settings of the device.");
thisSerial.println(" C: Toggle printing of CPU and Memory usage"); thisSerial.println(" C: Toggle printing of CPU and Memory usage");
@ -52,7 +52,7 @@ extern void switchToMicInOnMicJack(void);
extern void switchToLineInOnMicJack(void); extern void switchToLineInOnMicJack(void);
//switch yard to determine the desired action //switch yard to determine the desired action
void SerialManager::respondToByte(char c) { void SerialManager_OA::respondToByte(char c) {
//float old_val = 0.0, new_val = 0.0; //float old_val = 0.0, new_val = 0.0;
switch (c) { switch (c) {
case 'h': case '?': case 'h': case '?':

0
examples/FrequencyShifter_FD/FrequencyShifter_FD.ino → examples/FrequencyShifter_FD_OA/FrequencyShifter_OA_FD.ino
Unescape View File

0
examples/FrequencyShifter_FD/SerialManager.h → examples/FrequencyShifter_FD_OA/SerialManager_Shift_OA.h
Unescape View File

0
examples/LowpassFilter_FD/AudioEffectLowpassFD_F32.h → examples/LowpassFilter_FD_OA/AudioEffectLowpassFD_OA_F32.h
Unescape View File

3
examples/LowpassFilter_FD/LowpassFilter_FD.ino → examples/LowpassFilter_FD_OA/LowpassFilter_FD_OA.ino
Unescape View File

@ -26,10 +26,9 @@
* This example code is in the public domain (MIT License) * This example code is in the public domain (MIT License)
*/ */
#include "SD.h"
#include "AudioStream_F32.h" #include "AudioStream_F32.h"
#include <OpenAudio_ArduinoLibrary.h> #include <OpenAudio_ArduinoLibrary.h>
#include "AudioEffectLowpassFD_F32.h" // the local file holding your custom function #include "AudioEffectLowpassFD_OA_F32.h" // the local file holding your custom function
//set the sample rate and block size //set the sample rate and block size
const float sample_rate_Hz = 44117.f; const float sample_rate_Hz = 44117.f;

2
readme.md
Unescape View File

@ -15,6 +15,8 @@ OpenAudio Library for Teensy
10-Added new analyze_rms_f32.h and .cpp that parallel similar classes in the Teensy I16 library. 10-Added new analyze_rms_f32.h and .cpp that parallel similar classes in the Teensy I16 library.
11-Moved AudioSwitch_F32 from Tympan, added 8-channel version. 11-Moved AudioSwitch_F32 from Tympan, added 8-channel version.
12-Added /examples/Switches_float.ino for 4 and 8 channel switches. 12-Added /examples/Switches_float.ino for 4 and 8 channel switches.
13-Moved FFT_Overlapped_F32 files from Tympan, revised for T4.0, added _OA name isolation.
14-Moved Overlapped FFT LPF .INO from Tympan to OA. Working T3.6 and T4.0
**Purpose**: The purpose of this library is to build upon the [Teensy Audio Library](http://www.pjrc.com/teensy/td_libs_Audio.html) to enable new functionality for real-time audio processing. **Purpose**: The purpose of this library is to build upon the [Teensy Audio Library](http://www.pjrc.com/teensy/td_libs_Audio.html) to enable new functionality for real-time audio processing.

Write Preview
Loading…
Cancel
Save