Appendix B Audio Specifications AAC Audio
© 2015 Harmonic Inc. All rights reserved. 81 Electra 9200, Rev O
Table B–2 applies to native and pass-through AC-3 audio and lists the bit rates for the sample
frequencies of 48 kHz, 44.1 kHz, and 32 kHz.
NOTE: Changing from non-single-channel mode to single-channel mode provisions the transport bit
rate automatically.
When you change between single-channel and non-single-channel modes, the encoder
automatically provisions the bit rate to the closest available bit rate. In some cases, this means
the bit rate is lower because provisioning does not increase the bit rate defined for the por t.
Therefore, changing the coding mode from non-single-channel mode to any of the four
highest bit rates causes the encoder to provision the bit rate to 192 Kbps.
In the case of the three lowest bit rates, when you change from single-channel to non-single-
channel mode, because the bit rate is the lowest available, the encoder provisions to the next
highest available bit rate, 64 Kbps. If you set the bit rate to 80 Kbps and then change the
coding mode to non-single-channel, the encoder provisions the bit rate to 64 Kbps.
AAC Audio
The following table lists the bit rates for MPEG-2 or MPEG-4 Advanced Audio Coding (AAC)
and HE AAC audio compression at 48 kHz, 44.1 kHz, and 32 kHz.
Table B–2: AC-3 Audio Bit Rates
Audio Bit
Rate (Kbps)
Audio without PCR Audio with PCR
48 kHz 44.1 kHz 32 kHz 48 kHz 44.1 kHz 32 kHz
56 65.8 60.5 62.7 65.8 60.5 62.7
64 75.2 69.1 68.9 75.2 69.1 68.9
80 84.6 86.4 87.7 84.6 86.4 87.7
96 103.4 103.6 100.3 103.4 103.6 106.5
112 122.2 120.9 119.1 122.2 120.9 119.1
128 131.6 138.2 131.6 141.0 138.2 137.9
160 169.2 164.1 169.2 169.2 172.7 169.2
192 197.4 198.6 200.5 206.8 198.6 200.5
224 235.0 233.2 231.9 235.0 233.2 231.9
256 263.2 267.7 263.2 272.6 267.7 269.5
320 329.0 328.2 332.1 338.4 336.8 332.1
384 394.8 397.3 394.8 404.2 397.3 394.8
448 460.6 466.4 463.7 460.6 466.4 463.7
512 526.4 526.8 526.4 526.4 526.8 526.4
576 592.2 595.9 589.1 592.2 595.9 595.3
640 658.0 656.4 658.0 658.0 656.4 658.0
To Next Page
Loading...
