Configure compression

Compression takes place for all audio input formats except G723.1 (5.3K), and G729A. Compression is not applicable to IP video recording.

G.711 is not supported above 1000 channels.

Audio recording in G.722 format is supported, however it cannot be replayed until it is transcoded into a different format. Use the following procedures to specify the audio compression type for the compression of recordings.

Only uncompressed audio formats will undergo further compression.

Upgrades to version 11 will maintain established compression settings, but new installations will have mixing “off” and G.723.1 (5.3 K) enabled by default.

Procedure 

  1. Under General Setup > Compression.

    Compression under General Setup

  2. Specify the type of compression you want, from the following options (all possible combinations will be valid).

    Stereo files are produced by IP Recorders if the input audio is stereo (all Interception systems and most Delivery systems), and either the input audio is already compressed, or mixing is disabled. Mono files are produced by all TDM Recorders. Mono files are produced by IP Recorders if either the input format is G.711 or G.722 and mixing is enabled, or (in some Delivery mode systems) the VoIP system mixes the audio before it is delivered to the Recorder. The compression type does not affect whether files are mono or stereo.

    Item

    Description

    Mixed Mono

    Select this check box to enable mixing (applies to IP only). This mode mixes one stereo audio file into one mono audio file to save disk space.

    For G.711 and G.722, it is recommended that files are not mixed.

    • enabling mixing produces one stereo energy file in the format .ene. The audio will be a single mono file.

    • switching mixing off produces one stereo audio file.

    Inline Compression

    This setting must always be enabled. The ability to turn this off has been deprecated and is no longer supported in the product. It will be removed in a future version of the product.

    Compression Type

    G.723.1 (5.3 K)

    This is the recommended audio format. Choose this option to convert audio from the original format to G.723.1 (5.3 K).

    See the Performance and Sizing Guide for the audio file sizes produced by the settings above.

  3. Click Save.

Related topics 

Getting started with recorders