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Codec Tieline Gateway
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249
© Tieline Research Pty. Ltd. 2021
Gateway and Gateway 4 Manual v1.2
moderate to high
bit rates
· Very high quality audio
for remotes, STLs and
audio distribution
MPEG Layer 3
Up to
15kHz
100ms
64kbps
8.5 -
13.3kbps
· High quality voice
and music
· Moderate bit
rates
· High delay
· High quality remotes,
STLs and audio
distribution
· Use w hen bidirectional
communication
between announcers
is not required
LC-AAC
Up to
15kHz
64ms
64kbps
15kbps
· High quality voice
and music at
low est bit rate;
better quality at
higher bit rates
· Moderate delay
at moderate to
high bit rates
· Voice or music
remotes as w ell as
STLs and audio
distribution where
some delay is tolerable
· Tieline Music or
MusicPLUS deliver
low er delay
HE-AAC v.1
Up to
15kHz
128ms
48kbps
7.4kbps
· High quality voice
and music at the
low est bit rate;
better quality at
higher bit rates
· Low to Moderate
bit rates
· High delay
· Live voice or music
remotes as w ell as
STLs and audio
distribution with limited
connection bandw idth
· Use w hen bidirectional
communication
between announcers
is not required
HE-AAC v.2
Up to
15kHz
128ms
Minimum
16kbps
(Mono);
24kbps
(stereo)
7.4kbps
· High quality voice
and music
· Low bit rates
· High delay
· Used for DAB+ radio
streaming
· Ideal for low bit rate
remotes
· Use w hen bidirectional
communication
between announcers
is not required
AAC-LD
Up to
20kHz
20ms at
48kHz
48kbps
minimum
30kbps
· Very high quality
voice and music
· Very low delay
at low to
moderate bit
rates
· Very high quality, very
low delay STLs and
audio distribution
· Remote connections
able to achieve
48kbps for each audio
channel requiring
· Suitable w hen
bidirectional
communication
between announcers
is required
AAC-ELD
Up to
20kHz
15-30ms
24 kbps
minimum
15-30kbps
· Very high quality
voice and music
· Very low delay
at low bit rates
· Great for live voice or
music remotes
· Suitable w hen
bidirectional
communication
between announcers
is required
AAC-ELDv.2
Up to
20kHz
35ms
Pending
release
Pending
release
· High quality voice
and music
· Low delay at low
bit rates
· Great for live voice or
music remotes w here
limited connection
bandw idth is available
· Suitable w hen
bidirectional
communication
between announcers
is required

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