Flac; Opus - Comrex ACCESS MultiRack Product Manual

FlAc*

This encoder compresses audio data using a lossless algorithm. This means that the audio extracted from the
decoder is identical to the audio input to the encoder, with no coding artifacts. FLAC typically removes 30-40% of
the network data compared to Linear PCM, but the actual data rate is variable and is based on the complexity of
the coded audio.
Using FLAC over Linear PCM typically results in a slightly higher (5 ms) overall delay.
g.722
This is a well known 7 kHz (medium fidelity) algorithm used in some VoIP telephones and codecs. It is provided for
compatibility purposes, and is not considered a superior algorithm for audio codecs.

opus

A newer offering that combines low delay and low network utilization. Opus is included primarily for compatibility
with softphone apps, and Internet connections using WebRTC (see Technotes about WebRTC on the Comrex
website). Special CBR modes are offered for compatibility with Tieline products—avoid these in other applications.
Due to its versatility in audio quality and low networking drain, Opus is the default profile for Comrex codecs.
*Linear PCM and FLAC are only supported for CrossLock connections on devices running 4.3-p4 firmware or
higher.
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