Tieline ViA User Manual page 146

146 ViA User Manual v2.0
A sample rate of 32kHz is used in the codec's default profiles to achieve ultra-low bit-rate
connections, but this is adjustable to 44.1kHz or 48kHz if required.
AAC-LD
AAC-LD (Low Delay AAC), AAC-ELD (Enhanced Low Delay AAC) and AAC-ELD v 2 are
optimized for low latency real-time communication. AAC-LD is suited to bit rates of 96kbps or
higher for stereo audio.
AAC-ELD
AAC-ELD is optimized for high quality stereo connections from 48 - 96kbps and performs better
at these bit rates when compared with AAC-LD.
AAC-ELD v 2
For stereo connections below 48kbps AAC-ELD v2 will deliver better performance than AAC-
ELD down to 24kbps.
Overview of aptX Enhanced Audio Coding
aptX® Enhanced audio coding is used by thousands of radio stations to deliver very low delay audio
for IP broadcasts and is ideal for high quality studio-to-transmitter links and audio distribution. It
delivers outstanding audio quality with exceptionally low delay across a range of IP networks.
32kHz or 48kHz sample rates are available at either 16 bit or 24 bits per sample. aptX Enhanced
has a minimum connection bit rate of 128kbps per channel and offers 10Hz to 24kHz frequency
response. 24 bit, 48kHz aptX Enhanced at the maximum bit rate of 576kbps delivers >120dB of
dynamic range.
Mono 16 bit, 32 kHz aptX® Enhanced is supported at 128kbps over ISDN using 2 B channels.
Overview of Opus Algorithm
Opus is a highly versatile open source audio coding algorithm. It incorporates technology from the
well-known SILK and CELT codecs to create a low latency speech and audio codec. It is a variable
bit rate algorithm ideal for live broadcast situations because of its capacity to deliver high quality,
real-time Audio over IP (AoIP) at low bit rates. Visit
There are three Opus algorithm configurations available:
Algorithm
Opus Voice
Opus Mono
Opus Stereo
Configuring an Algorithm in the Codec
1. Press the HOME
2. Tap Algorithm to reconfigure the algorithm for the selected Transport (IP, SIP, ISDN, POTS).
Recommended connection for on-air use
High quality low bit rate remotes (9.6kbps -64kbps)
Very high quality mono remotes, STLs and audio distribution (48kbps -
128kbps)
Very high quality stereo remotes, STLs and audio distribution (64kbps -
256kbps)
button to return to the Home screen, then tap Dialer
http://www.opus-codec.org for more info.
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© Tieline Pty. Ltd. 2017