Selecting An Algorithm - Tieline ViA User Manual

5. The USB modem should connect to the network as displayed in the following image.
29.3

Selecting an Algorithm

The codec offers uncompressed linear PCM audio as well as aptX® Enhanced, LC-AAC, HE-AAC
v.1 and HE-AAC v.2, AAC-LD, AAC-ELD, AAC-ELDv2, MPEG Layer 2, G.711 and G.722, Tieline
Music and MusicPLUS algorithms.
Overview of Tieline Algorithms
1. The Tieline Music algorithm is optimized for audio bit rates as low as 19.2kbps with only a 20
millisecond encode delay. It offers 15 kHz mono from 24kbps to 48kbps.
2. Tieline MusicPLUS delivers up to 20 kHz mono from 48kbps upwards. It can also deliver up to 20
kHz stereo from 96kbps upwards, offering huge savings on your IP data bills and outstanding
audio quality.
Overview of AAC Algorithms
AAC-LC
LC-AAC is optimized for audio bit rates of 64kbps per channel or higher using a sample rate of
48kHz. Tieline recommends using LC-AAC instead of HE-AAC if bandwidth of 64kbps or higher
per channel is available, to optimize audio quality. If lower bandwidth than 64kbps is available
consider using HE-AAC, Tieline Music or Tieline MusicPLUS.
AAC-HE
Codecs include both HE-AAC v.1 and HE-AAC v.2, which are optimized for low bit rate
connections. Selection of HE-AAC v.1 and v.2 is automatically managed within the codec, so
only AAC-HE is displayed on the screen. When used for mono connections, HE-AAC v.1
performs best at bit rates of 24kbps per channel or higher. HE-AAC v.1 is also used for stereo
connections when audio connection bandwidth is 48kbps or higher.
HE-AAC v.2 is used for stereo connections when audio connection bandwidth is below 48kbps
and is capable of delivering 15kHz quality stereo audio at audio bit rates as low as 24kbps.
© Tieline Pty. Ltd. 2017
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