Appendix A Audio and Video Specifications
MPEG-1 Layer II Audio
© 2012 Harmonic Inc.
39
Electra 1000, Version 3.0, Rev M
A.2 MPEG-1 Layer II Audio
Table A-2 lists the bit rates in Kbps for the sample frequencies of 48 kHz, 44.1 kHz, and
32 kHz. This table is for MPEG-1 Layer II audio.
A.3 Dolby Digital (AC-3) Audio
AIC-equipped encoders support native two-channel Dolby Digital (AC-3) compression.
NOTE:
Harmonic supports Dolby Digital (AC-3) passthrough rates of 96 to 640 Kbps, and native Dolby
Digital (AC-3) rates of 56 to 640 Kbps.
Table A-2: MPEG-1 Layer II Audio Bit Rates
Audio
Bit Rate
(Kbps)
Audio without PCR
Audio with PCR
48 kHz
44.1 kHz
(analog
only)
32 kHz
(analog
only)
48 kHz
44.1 kHz
(analog
only)
32 kHz
(analog
only)
32
41.8
38.4
34.8
41.8
38.4
34.8
48
52.2
57.6
55.7
52.2
57.6
55.7
56
62.7
67.2
62.7
62.7
67.2
62.7
64
73.1
67.2
69.6
73.1
76.8
69.6
80
83.6
86.4
83.6
94.0
86.4
90.5
96
104.4
105.6
104.4
104.4
105.6
104.4
112
125.3
115.1
118.4
125.3
124.7
118.4
128
135.8
134.3
132.3
135.8
134.3
139.3
160
167.1
172.7
167.1
167.1
172.7
167.1
192
198.4
201.5
201.9
208.9
201.5
201.9
224
229.8
230.3
229.8
240.2
239.9
236.7
256
271.6
268.7
264.6
271.6
268.7
264.6
320
334.2
335.9
334.2
334.2
335.9
334.2
384
396.9
393.4
396.9
396.9
403.0
396.9