Appendix B Audio Specifications
AAC Audio
© 2015 Harmonic Inc. All rights reserved.
81
Electra 9200, Rev O
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 port.
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
