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PaulStoffregen e3353358b6 Don't cause a loud pop when changing biquad filter coefficients 8 lat temu
examples Add documentation links to all tutorial examples 8 lat temu
extras Len noticed a bug in binary velocity output 8 lat temu
gui Update documentation with links to Sparkfun's blog 8 lat temu
utility Typo 8 lat temu
.travis.yml Update Travis CI settings 8 lat temu
Audio.h Add CS4272 control (thanks William Hollender) 8 lat temu
AudioControl.h Add AudioSynthWaveformSine 10 lat temu
README.md remove Travis CI status from readme (it's too unreliable) 8 lat temu
analyze_fft256.cpp Initial work on FFT256 for Teensy-LC (untested) 9 lat temu
analyze_fft256.h Fix FFT read range (now inclusive) 9 lat temu
analyze_fft1024.cpp Fix some Teensy-LC compiler errors 9 lat temu
analyze_fft1024.h Fix FFT read range (now inclusive) 9 lat temu
analyze_notefreq.cpp Removed debug code, updated comments 8 lat temu
analyze_notefreq.h Rename AudioAnalyzeGuitarTuner to AudioAnalyzeNoteFrequency 9 lat temu
analyze_peak.cpp Add TODO for analyze peak optimization 8 lat temu
analyze_peak.h Add readPeakToPeak() to AudioAnalyzePeak 9 lat temu
analyze_print.cpp Change AudioAnalyzePrint name API 10 lat temu
analyze_print.h Change AudioAnalyzePrint name API 10 lat temu
analyze_rms.cpp Don't compile M4 code on LC (but LC still not working) 8 lat temu
analyze_rms.h rewrite AudioAnalyzeRMS - arm math version doesn't work! 9 lat temu
analyze_tonedetect.cpp Fix more Teensy-LC compiler errors 9 lat temu
analyze_tonedetect.h Add MIT license 10 lat temu
control_ak4558.cpp Fixed control functions, examples, GUI elements 9 lat temu
control_ak4558.h Fixed control functions, examples, GUI elements 9 lat temu
control_cs4272.cpp Add CS4272 control (thanks William Hollender) 8 lat temu
control_cs4272.h Add CS4272 control (thanks William Hollender) 8 lat temu
control_sgtl5000.cpp Add ability to control two SGTL5000 chips 8 lat temu
control_sgtl5000.h Add ability to control two SGTL5000 chips 8 lat temu
control_wm8731.cpp AudioControlWM8731::inputLevel(float n) 9 lat temu
control_wm8731.h AudioControlWM8731::inputLevel(float n) 9 lat temu
data_ulaw.c Add missing open source license headers 10 lat temu
data_waveforms.c Remove old AudioSynthWaveform 10 lat temu
data_windows.c Add other window types for 1024 point FFT 10 lat temu
effect_bitcrusher.cpp Fix compiler warning 9 lat temu
effect_bitcrusher.h Add Bitcrusher effect (thanks Pensive) 9 lat temu
effect_chorus.cpp Merge pull request #166 from FrankBoesing/patch-2 8 lat temu
effect_chorus.h remove unimplemented stop() 10 lat temu
effect_delay.cpp Remove unused multiplier 10 lat temu
effect_delay.h Add AudioEffectDelay 10 lat temu
effect_delay_ext.cpp Add SPI external memory timing comment 8 lat temu
effect_delay_ext.h Add support for Frank's 6-chip Memoryboard4 (AUDIO_MEMORY_MEMORYBOARD) 9 lat temu
effect_envelope.cpp Add AudioEffectEnvelope 10 lat temu
effect_envelope.h Add AudioEffectEnvelope 10 lat temu
effect_fade.cpp Add MIT license 10 lat temu
effect_fade.h Add MIT license 10 lat temu
effect_flange.cpp use AUDIO_SAMPLE_RATE_EXACT 8 lat temu
effect_flange.h remove unimplemented stop() 10 lat temu
effect_midside.cpp Don't compile M4 code on LC (but LC still not working) 8 lat temu
effect_midside.h Add AudioEffectMidSide (thanks Hedde Bosman) 9 lat temu
effect_multiply.cpp Fix more Teensy-LC compiler errors 9 lat temu
effect_multiply.h Add AudioEffectMultiply 10 lat temu
filter_biquad.cpp Don't cause a loud pop when changing biquad filter coefficients 8 lat temu
filter_biquad.h Improve Biquad filter 10 lat temu
filter_fir.cpp Impove and document FIR filter 10 lat temu
filter_fir.h Document FIR filter requirements, fixes #114 8 lat temu
filter_fir.md Change FIR filter (as suggested by rheslip) to filter one channel instead of two. Updated example, added documenting file 10 lat temu
filter_variable.cpp Fix more Teensy-LC compiler errors 9 lat temu
filter_variable.h Finish AudioFilterStateVariable (signal control of corner frequency) 10 lat temu
input_adc.cpp Fix some Teensy-LC compiler errors 9 lat temu
input_adc.h Fix AudioInputAnalog 10 lat temu
input_i2s.cpp Fix more Teensy-LC compiler errors 9 lat temu
input_i2s.h Use DMAChannel begin() 10 lat temu
input_i2s_quad.cpp More hardware defs 8 lat temu
input_i2s_quad.h Begin work on quad channel audio input 8 lat temu
keywords.txt Add CS4272 control (thanks William Hollender) 8 lat temu
library.json Use tagged source code from repo 8 lat temu
library.properties Increase to version 1.03 9 lat temu
memcpy_audio.S More hardware defs 8 lat temu
memcpy_audio.h Add memcpy_tointerleaveQuad (thanks Frank) 8 lat temu
mixer.cpp Fix some Teensy-LC compiler errors 9 lat temu
mixer.h Allow negative/inverting mixer gain 9 lat temu
multiplier.md Add a multiplier (by rheslip) 10 lat temu
new_objects.md change format for new_objects files 11 lat temu
output_dac.cpp More hardware defs 8 lat temu
output_dac.h Initial work on DAC for Teensy-LC (still incomplete) 9 lat temu
output_i2s.cpp Be more careful when configuring MCLK 8 lat temu
output_i2s.h Use DMAChannel begin() 10 lat temu
output_i2s_quad.cpp Be more careful when configuring MCLK 8 lat temu
output_i2s_quad.h Begin work on quad channel audio input 8 lat temu
output_pwm.cpp Fix more Teensy-LC compiler errors 9 lat temu
output_pwm.h Make input ADC and output DAC play nicely together 10 lat temu
output_spdif.cpp Be more careful when configuring MCLK 8 lat temu
output_spdif.h Add keywords 9 lat temu
play_memory.cpp Add status and position functions to AudioPlayMemory 10 lat temu
play_memory.h Add status and position functions to AudioPlayMemory 10 lat temu
play_queue.cpp do not forget - your own addition :-) 10 lat temu
play_queue.h do not forget - your own addition :-) 10 lat temu
play_sd_raw.cpp Do not disable all interrupts while opening RAW files 9 lat temu
play_sd_raw.h Fix status functions in AudioPlaySdRaw 10 lat temu
play_sd_wav.cpp Fix stereo WAV file startup & end (first and last 3 milliseconds) 9 lat temu
play_sd_wav.h Fix audible click at end of Wav file playing 10 lat temu
play_serialflash_raw.cpp remove leftover debug code from AudioPlaySerialflashRaw 9 lat temu
play_serialflash_raw.h Add AudioPlaySerialflashRaw 9 lat temu
record_queue.cpp Fix harmless compiler warnings in AudioRecordQueue 10 lat temu
record_queue.h Finish AudioRecordQueue and Record example 10 lat temu
spi_interrupt.cpp Add SPI interrupt registration layer 10 lat temu
spi_interrupt.h register SPI interrupt when playing WAV & RAW files 10 lat temu
synth_dc.cpp Add AudioSynthWaveformDc 10 lat temu
synth_dc.h grrrr 8 lat temu
synth_pinknoise.cpp Clean up harmless compiler warnings 10 lat temu
synth_pinknoise.h Add AudioSynthNoisePink 10 lat temu
synth_sine.cpp fix incorrect comment 8 lat temu
synth_sine.h Add AudioSynthWaveformSineHires - High Precision Sine Wave 9 lat temu
synth_tonesweep.cpp fix tonesweep 8 lat temu
synth_tonesweep.h Clean up harmless compiler warnings 10 lat temu
synth_waveform.cpp #144: Add the reverse sawtooth and sample-and-hold waveforms. 9 lat temu
synth_waveform.h #144: Add the reverse sawtooth and sample-and-hold waveforms. 9 lat temu
synth_waveform.md Fixed AudioSynthWaveform. Uses LUT with linear interpolation for sinewave. 10 lat temu
synth_whitenoise.cpp Fix more Teensy-LC compiler errors 9 lat temu
synth_whitenoise.h Fix multiple white noise instances 10 lat temu

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