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Tethr-supported audio file types and codecs

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Overview:

In this article, you'll learn the Tethr-supported audio file types and their codecs.

What we'll cover:

  1. Import WAV audio file types

  2. Import MP3 audio file types

  3. Import OGG audio file types

  4. What's next?

Before you begin:

Call audio imported into Tethr must meet these pre-requisites:

  • Each audio file submitted to Tethr must specify a MIME type in the audio section.
  • Channelized audio files are preferred. Channelized audio files are typically those with two-channel, or stereo, that handle internal and external participants on discrete channels.

  • Tethr supports multi-channel audio files with two or more channels. Multi-channel audio must be accompanied by appropriate metadata to identify the participant in each channel.

Import WAV file types

  1. To import, you'll use a standard .wav file. 
  2. The MIME type can be synonymously specified using audio/x-wav, audio/wave, audio/vnd.wav, audio/x-wave, or audio/wav.
  3. The files must have a standard RIFF header.
  4. Tethr recommends a sample rate of 8 kHz or 16 kHz.


Tethr-supported encoding types:

 
Codec type Codec description
ALaw (RIFF wFormat tag 0x0006) This is 8kHz G.711 using the ALaw algorithm, a non-linear 8-bit-per-sample format.
μ-Law 

(RIFF wFormat tag 0x0007) This is also 8kHz G.711, but uses the μ-Law algorithm—another 8-bit-per-sample format in wider use in the U.S.
PCM

(RIFF wFormat tag 0x0001) This is linear pulse code modulated audio, the closest equivalent to “uncompressed”, with 16 bits per sample.
IeeeFloat

(RIFF wFormat tag 0x0003) This is 32-bit floating-point audio where each sample is a single-precision floating-point number.
G.723 (RIFF wFormat tag 0xA100 sometimes specified as “Comverse Infosys Ltd. G723.1”) These are stereo audio files encoded in G.723 format by a Verint system. Stereo is accomplished by interleaving 30-millisecond chunks of audio, which generally correspond to RTP packets.

Import MP3 file types

Use MP3 files by specifying the MIME type audio/mp3. These files can have any sample rate or compression quality.

Import OGG file types

  1. Currently, OPUS format files are the only audio type that can be sent in OGG encapsulation. These files conventionally have .opus extensions.
  2. Outside of VoIP circles, OGG files are more often encoded using Vorbis. Tethr doesn't currently support Vorbis. 
  3. Use audio/ogg type to specify OPUS encoded OGG audio files only.

What's next?

Once we've verified that your audio and metadata are flowing into Tethr, and automated the process, you'll work with a Tethr Customer Success Manager to begin generating insights about your customer interactions.

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