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ODAS Audio Playback Guide

← Previous: ODAS Data Format | Next: Streaming ODAS Audio Player →

← Back to Documentation

Understanding ODAS Output Files

ODAS produces several types of audio output files with different characteristics:

Raw Input File

  • Sample rate: 16000 Hz
  • Bit depth: 32-bit
  • Channels: 8 (for ReSpeaker 6 Mic Array)
  • Format: Signed integer, little-endian

Postfiltered Output File

  • Sample rate: 44100 Hz
  • Bit depth: 16-bit
  • Channels: 4 (separated audio streams)
  • Format: Signed integer, little-endian

Playing Audio Files

Playing Raw Input

play -r 16000 -b 32 -c 8 -e signed-integer -t raw input.raw

Playing Postfiltered Output

The postfiltered output contains 4 channels of separated audio. Here are different ways to play it:

  1. Play all 4 channels (correct speed but may be unbalanced):
play -r 44100 -b 16 -c 4 -e signed-integer -t raw postfiltered.raw
  1. Mix all channels to stereo (both ears):
play -r 44100 -b 16 -c 4 -e signed-integer -t raw postfiltered.raw remix 1,2,3,4 1,2,3,4
  1. Map specific channels to left and right:
# Channels 1+2 in left, 3+4 in right
play -r 44100 -b 16 -c 4 -e signed-integer -t raw postfiltered.raw remix 1,2 3,4

# Channels 1+3 in left, 2+4 in right
play -r 44100 -b 16 -c 4 -e signed-integer -t raw postfiltered.raw remix 1,3 2,4
  1. Listen to individual channels:
# Channel 1 only
play -r 44100 -b 16 -c 4 -e signed-integer -t raw postfiltered.raw remix 1

# Channel 2 only
play -r 44100 -b 16 -c 4 -e signed-integer -t raw postfiltered.raw remix 2

# Channel 3 only
play -r 44100 -b 16 -c 4 -e signed-integer -t raw postfiltered.raw remix 3

# Channel 4 only
play -r 44100 -b 16 -c 4 -e signed-integer -t raw postfiltered.raw remix 4

Notes

  • The postfiltered output contains separated audio streams in 4 channels
  • Different channel mappings may work better depending on your setup
  • Always use the correct sample rate and channel count to maintain proper playback speed

My testing

Host:

scp hexapod@192.168.0.122:/home/hexapod/hexapod/postfiltered.raw .
./hexapod/odas/convert_odas_audio.py ~/postfiltered.raw test.wav
 afplay test.wav

Target:

python hexapod/odas/odas_server.py
./hexapod/odas/convert_odas_audio.py postfiltered.raw test.wav
./hexapod/odas/test_picovoice_complete.py test.wav --access-key ACCESS_KEY

← Previous: ODAS Data Format | Next: Streaming ODAS Audio Player →

← Back to Documentation