RFspace NetSDR Bedienungsanleitung PDF herunterladen (Seite 16)

May 4, 2013

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7.3 Audio Codec

This software uses the Opus Interactive Audio Codec to reduce network bandwidth when

sending audio between the server and the console. For more information about Opus visit

http://www.opus-codec.org/.

There are various options which can be set in the encoder (runs on the server), these are

described below.

The opus encoder supports three coding modes (the default used in the server is

OPUS_APPLICATION_AUDIO):

 VOIP gives best quality at a given bitrate for voice signals. It enhances the input

signal by high-pass filtering and emphasizing formants and harmonics. Optionally it

includes in-band forward error correction to protect against packet loss. Use this

mode for typical VoIP applications. Because of the enhancement, even at high

bitrates the output may sound different from the input.

 Audio gives best quality at a given bitrate for most non-voice signals like music. Use

this mode for music and mixed (music/voice) content, broadcast, and applications

requiring less than 15 ms of coding delay.

The encoder supports a hint which helps the encoder's mode selection (the default used is

OPUS_AUTO):

 Auto (default)

 Voice Bias thresholds towards choosing LPC or Hybrid modes.

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RFspace NetSDR Bedienungsanleitung Seite 16