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PaulStoffregen c2da2cd825 Update Travis CI settings pirms 8 gadiem
examples Move miditones to "extras"-folder to prevent compiling pirms 8 gadiem
extras Move miditones to "extras"-folder to prevent compiling pirms 8 gadiem
gui Fix AudioEffectFlange documentation pirms 8 gadiem
utility rewrite AudioAnalyzeRMS - arm math version doesn't work! pirms 9 gadiem
.travis.yml Update Travis CI settings pirms 8 gadiem
Audio.h Add CS4272 control (thanks William Hollender) pirms 8 gadiem
AudioControl.h Add AudioSynthWaveformSine pirms 10 gadiem
README.md remove Travis CI status from readme (it's too unreliable) pirms 8 gadiem
analyze_fft256.cpp Initial work on FFT256 for Teensy-LC (untested) pirms 9 gadiem
analyze_fft256.h Fix FFT read range (now inclusive) pirms 9 gadiem
analyze_fft1024.cpp Fix some Teensy-LC compiler errors pirms 9 gadiem
analyze_fft1024.h Fix FFT read range (now inclusive) pirms 9 gadiem
analyze_notefreq.cpp Rename AudioAnalyzeGuitarTuner to AudioAnalyzeNoteFrequency pirms 9 gadiem
analyze_notefreq.h Rename AudioAnalyzeGuitarTuner to AudioAnalyzeNoteFrequency pirms 9 gadiem
analyze_peak.cpp Add TODO for analyze peak optimization pirms 8 gadiem
analyze_peak.h Add readPeakToPeak() to AudioAnalyzePeak pirms 9 gadiem
analyze_print.cpp Change AudioAnalyzePrint name API pirms 10 gadiem
analyze_print.h Change AudioAnalyzePrint name API pirms 10 gadiem
analyze_rms.cpp Don't compile M4 code on LC (but LC still not working) pirms 9 gadiem
analyze_rms.h rewrite AudioAnalyzeRMS - arm math version doesn't work! pirms 9 gadiem
analyze_tonedetect.cpp Fix more Teensy-LC compiler errors pirms 9 gadiem
analyze_tonedetect.h Add MIT license pirms 10 gadiem
control_ak4558.cpp Fixed control functions, examples, GUI elements pirms 9 gadiem
control_ak4558.h Fixed control functions, examples, GUI elements pirms 9 gadiem
control_cs4272.cpp Add CS4272 control (thanks William Hollender) pirms 8 gadiem
control_cs4272.h Add CS4272 control (thanks William Hollender) pirms 8 gadiem
control_sgtl5000.cpp Add ability to control two SGTL5000 chips pirms 8 gadiem
control_sgtl5000.h Add ability to control two SGTL5000 chips pirms 8 gadiem
control_wm8731.cpp AudioControlWM8731::inputLevel(float n) pirms 9 gadiem
control_wm8731.h AudioControlWM8731::inputLevel(float n) pirms 9 gadiem
data_ulaw.c Add missing open source license headers pirms 10 gadiem
data_waveforms.c Remove old AudioSynthWaveform pirms 10 gadiem
data_windows.c Add other window types for 1024 point FFT pirms 10 gadiem
effect_bitcrusher.cpp Fix compiler warning pirms 9 gadiem
effect_bitcrusher.h Add Bitcrusher effect (thanks Pensive) pirms 9 gadiem
effect_chorus.cpp Remove debug Serial.print... pirms 8 gadiem
effect_chorus.h remove unimplemented stop() pirms 10 gadiem
effect_delay.cpp Remove unused multiplier pirms 10 gadiem
effect_delay.h Add AudioEffectDelay pirms 10 gadiem
effect_delay_ext.cpp Add support for Frank's 6-chip Memoryboard4 (AUDIO_MEMORY_MEMORYBOARD) pirms 9 gadiem
effect_delay_ext.h Add support for Frank's 6-chip Memoryboard4 (AUDIO_MEMORY_MEMORYBOARD) pirms 9 gadiem
effect_envelope.cpp Add AudioEffectEnvelope pirms 10 gadiem
effect_envelope.h Add AudioEffectEnvelope pirms 10 gadiem
effect_fade.cpp Add MIT license pirms 10 gadiem
effect_fade.h Add MIT license pirms 10 gadiem
effect_flange.cpp Change Flange effect to one channel pirms 10 gadiem
effect_flange.h remove unimplemented stop() pirms 10 gadiem
effect_midside.cpp Don't compile M4 code on LC (but LC still not working) pirms 9 gadiem
effect_midside.h Add AudioEffectMidSide (thanks Hedde Bosman) pirms 9 gadiem
effect_multiply.cpp Fix more Teensy-LC compiler errors pirms 9 gadiem
effect_multiply.h Add AudioEffectMultiply pirms 10 gadiem
filter_biquad.cpp Fix more Teensy-LC compiler errors pirms 9 gadiem
filter_biquad.h Improve Biquad filter pirms 10 gadiem
filter_fir.cpp Impove and document FIR filter pirms 10 gadiem
filter_fir.h Impove and document FIR filter pirms 10 gadiem
filter_fir.md Change FIR filter (as suggested by rheslip) to filter one channel instead of two. Updated example, added documenting file pirms 10 gadiem
filter_variable.cpp Fix more Teensy-LC compiler errors pirms 9 gadiem
filter_variable.h Finish AudioFilterStateVariable (signal control of corner frequency) pirms 10 gadiem
input_adc.cpp Fix some Teensy-LC compiler errors pirms 9 gadiem
input_adc.h Fix AudioInputAnalog pirms 10 gadiem
input_i2s.cpp Fix more Teensy-LC compiler errors pirms 9 gadiem
input_i2s.h Use DMAChannel begin() pirms 10 gadiem
input_i2s_quad.cpp Begin work on quad channel audio input pirms 8 gadiem
input_i2s_quad.h Begin work on quad channel audio input pirms 8 gadiem
keywords.txt Add CS4272 control (thanks William Hollender) pirms 8 gadiem
library.json Handle all nested examples pirms 9 gadiem
library.properties Increase to version 1.03 pirms 9 gadiem
memcpy_audio.S don't save r12 pirms 8 gadiem
memcpy_audio.h Add memcpy_tointerleaveQuad (thanks Frank) pirms 8 gadiem
mixer.cpp Fix some Teensy-LC compiler errors pirms 9 gadiem
mixer.h Allow negative/inverting mixer gain pirms 9 gadiem
multiplier.md Add a multiplier (by rheslip) pirms 10 gadiem
new_objects.md change format for new_objects files pirms 11 gadiem
output_dac.cpp Initial work on DAC for Teensy-LC (still incomplete) pirms 9 gadiem
output_dac.h Initial work on DAC for Teensy-LC (still incomplete) pirms 9 gadiem
output_i2s.cpp Optimize I2S output memory copy (thanks Frank Bösing) pirms 9 gadiem
output_i2s.h Use DMAChannel begin() pirms 10 gadiem
output_i2s_quad.cpp Add memcpy_tointerleaveQuad (thanks Frank) pirms 8 gadiem
output_i2s_quad.h Begin work on quad channel audio input pirms 8 gadiem
output_pwm.cpp Fix more Teensy-LC compiler errors pirms 9 gadiem
output_pwm.h Make input ADC and output DAC play nicely together pirms 10 gadiem
output_spdif.cpp Fix more Teensy-LC compiler errors pirms 9 gadiem
output_spdif.h Add keywords pirms 9 gadiem
play_memory.cpp Add status and position functions to AudioPlayMemory pirms 10 gadiem
play_memory.h Add status and position functions to AudioPlayMemory pirms 10 gadiem
play_queue.cpp do not forget - your own addition :-) pirms 10 gadiem
play_queue.h do not forget - your own addition :-) pirms 10 gadiem
play_sd_raw.cpp Do not disable all interrupts while opening RAW files pirms 9 gadiem
play_sd_raw.h Fix status functions in AudioPlaySdRaw pirms 10 gadiem
play_sd_wav.cpp Fix stereo WAV file startup & end (first and last 3 milliseconds) pirms 9 gadiem
play_sd_wav.h Fix audible click at end of Wav file playing pirms 10 gadiem
play_serialflash_raw.cpp remove leftover debug code from AudioPlaySerialflashRaw pirms 9 gadiem
play_serialflash_raw.h Add AudioPlaySerialflashRaw pirms 9 gadiem
record_queue.cpp Fix harmless compiler warnings in AudioRecordQueue pirms 10 gadiem
record_queue.h Finish AudioRecordQueue and Record example pirms 10 gadiem
spi_interrupt.cpp Add SPI interrupt registration layer pirms 10 gadiem
spi_interrupt.h register SPI interrupt when playing WAV & RAW files pirms 10 gadiem
synth_dc.cpp Add AudioSynthWaveformDc pirms 10 gadiem
synth_dc.h simplify overflow checks somewhat pirms 10 gadiem
synth_pinknoise.cpp Clean up harmless compiler warnings pirms 10 gadiem
synth_pinknoise.h Add AudioSynthNoisePink pirms 10 gadiem
synth_sine.cpp fix incorrect comment pirms 8 gadiem
synth_sine.h Add AudioSynthWaveformSineHires - High Precision Sine Wave pirms 9 gadiem
synth_tonesweep.cpp Bug fix so that downward tone sweeps will work. pirms 8 gadiem
synth_tonesweep.h Clean up harmless compiler warnings pirms 10 gadiem
synth_waveform.cpp #144: Add the reverse sawtooth and sample-and-hold waveforms. pirms 9 gadiem
synth_waveform.h #144: Add the reverse sawtooth and sample-and-hold waveforms. pirms 9 gadiem
synth_waveform.md Fixed AudioSynthWaveform. Uses LUT with linear interpolation for sinewave. pirms 10 gadiem
synth_whitenoise.cpp Fix more Teensy-LC compiler errors pirms 9 gadiem
synth_whitenoise.h Fix multiple white noise instances pirms 10 gadiem

README.md

Teensy Audio Library

16 bit, 44.1 kHz streaming audio library for Teensy 3.x, featuring:

  • Polyphonic Playback
  • Recording
  • Synthesis
  • Analysis
  • Effects
  • Filtering
  • Mixing
  • Multiple Simultaneous Inputs & Outputs
  • Flexible signal routing between library objects
  • Automatic Streaming while your Arduino sketch runs

Main Audio Library Page

http://www.pjrc.com/teensy/td_libs_Audio.html

Audio System Design Tool

Use this graphical tool to design your audio project. Easily browse the library’s many features, connect objects, export to Arduino code, and quickly access details for the functions each object provides for you to control it from your Arduino sketch!

http://www.pjrc.com/teensy/gui/

Supported Hardware

Audio Adaptor Board for 16 bit stereo input and output.

Inputs Outputs

Teensy 3.1 12 bit DAC

DAC Output

Teensy 3.1 or 3.0 ADC Input

ADC Input

Teensy 3.1 or 3.0 PWM Output

PWM Output