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tained for a given output bitrate therefore changes with sample
rate.
In the Antex software the bitrate is specified on a per-channel ba-
sis. Therefore, requesting 64 kbits/s and stereo will result in a
128 kbits/s compressed MPEG stream. Supported bitrates (per
channel) and compression ratios are as follows:
Layer I
32 KHz 44.1 KHz 48 KHz
Bitrate
(kbits/s)
Compression
ratio
Bitrate
(kbits/s)
Compression
ratio
Bitrate
(kbits/s)
Compression
ratio
32 16 32 22.1 32 24.0
64 8.0 64 11.0 64 12.0
96 5.3 96 7.4 96 8.0
128 5.5 128 6.0
160 4.8
Layer II
32 KHz 44.1 KHz 48 KHz
Bitrate
(kbits/s)
Compression
ratio
Bitrate
(kbits/s)
Compression
ratio
Bitrate
(kbits/s)
Compression
ratio
32 16 32 22.1 32 24
48 10.7 48 14.7 48 16
56 9.1 56 12.6 56 13.7
64 8.0 64 11.0 64 12.0
80 6.4 80 8.8 80 9.6
96 5.3 96 7.4 96 8.0
112 4.6 112 6.3 112 6.9
128 4.0 128 5.5 128 6.0
160 3.2 160 4.4 160 4.8
192 2.7 192 3.7 192 4.0
224* 2.3 224* 3.2 224* 3.4
256* 2 256* 2.8 256* 3.0
320* 1.6 320* 2.2 320* 2.4
384* 1.3 384* 1.8 384* 2.0
* These bitrates are available for mono files only.
Layer II uses a more sophisticated compression algorithm than
Layer I, so it is recommended that Layer II be used wherever pos-
sible.