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PaulStoffregen 4c6e76e2b4 Do not disable all interrupts while opening RAW files pirms 9 gadiem
examples Add Delay example pirms 10 gadiem
gui update gui docs for 1.00 range not 100.0 pirms 9 gadiem
utility Make input ADC and output DAC play nicely together pirms 10 gadiem
Audio.h Add AudioRecordQueue (work in progress) pirms 10 gadiem
AudioControl.h Add AudioSynthWaveformSine pirms 10 gadiem
README.md Update readme still yet again pirms 10 gadiem
analyze_fft256.cpp Add proper API to FFT objects pirms 10 gadiem
analyze_fft256.h Simplify & document SGTL5000 control pirms 10 gadiem
analyze_fft1024.cpp Add proper API to FFT objects pirms 10 gadiem
analyze_fft1024.h Add proper API to FFT objects pirms 10 gadiem
analyze_peak.cpp Change peak detect API to conform to library conventions pirms 10 gadiem
analyze_peak.h Change peak detect API to conform to library conventions pirms 10 gadiem
analyze_print.cpp Change AudioAnalyzePrint name API pirms 10 gadiem
analyze_print.h Change AudioAnalyzePrint name API pirms 10 gadiem
analyze_tonedetect.cpp mode documentation in the GUI pirms 10 gadiem
analyze_tonedetect.h Add MIT license pirms 10 gadiem
control_sgtl5000.cpp Simplify & document SGTL5000 control pirms 10 gadiem
control_sgtl5000.h Document sgtl5000 pirms 10 gadiem
control_wm8731.cpp Update WM8731 example pirms 10 gadiem
control_wm8731.h Update WM8731 example pirms 10 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_chorus.cpp Change Chrous effect to one channel pirms 10 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_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_multiply.cpp Add AudioEffectMultiply pirms 10 gadiem
effect_multiply.h Add AudioEffectMultiply pirms 10 gadiem
filter_biquad.cpp Improve Biquad filter pirms 10 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 Add credits/references for numerical approximation algorithms pirms 10 gadiem
filter_variable.h Finish AudioFilterStateVariable (signal control of corner frequency) pirms 10 gadiem
input_adc.cpp Fix AudioInputAnalog pirms 10 gadiem
input_adc.h Fix AudioInputAnalog pirms 10 gadiem
input_i2s.cpp Avoid allocating unneeded DMA channels pirms 10 gadiem
input_i2s.h Use DMAChannel begin() pirms 10 gadiem
keywords.txt Improve Biquad filter pirms 10 gadiem
library.json Fix JSON syntax pirms 10 gadiem
library.properties Add library.properties pirms 9 gadiem
mixer.cpp Add MIT license pirms 10 gadiem
mixer.h Add MIT license pirms 10 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 Avoid allocating unneeded DMA channels pirms 10 gadiem
output_dac.h Use DMAChannel begin() pirms 10 gadiem
output_i2s.cpp Avoid allocating unneeded DMA channels pirms 10 gadiem
output_i2s.h Use DMAChannel begin() pirms 10 gadiem
output_pwm.cpp Avoid allocating unneeded DMA channels pirms 10 gadiem
output_pwm.h Make input ADC and output DAC play nicely together pirms 10 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
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 Add MemoryAndCpuUsage example pirms 10 gadiem
synth_sine.h Add phase() to waveform objects pirms 10 gadiem
synth_tonesweep.cpp Fix up synth_tonesweep and the example to conform (more closely) to the naming conventions pirms 10 gadiem
synth_tonesweep.h Clean up harmless compiler warnings pirms 10 gadiem
synth_waveform.cpp Add simple pulse waveform pirms 10 gadiem
synth_waveform.h Clean up harmless compiler warnings pirms 10 gadiem
synth_waveform.md Fixed AudioSynthWaveform. Uses LUT with linear interpolation for sinewave. pirms 10 gadiem
synth_whitenoise.cpp Fix multiple white noise instances pirms 10 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