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Multiple - Description PCM Speech Coding Examples
Demonstration of Structured Dual Vector Quantizer PCM (SDVQ-PCM) Speech Coding
The average streaming rate required to play these .wav files is 128,000 bits/second. If they do not play well at
your site, you can copy the files to a local machine and play them, or you can create a local version of the demo
by going to /audio/sdvqpcm/, downloading demo.zip to
a local machine, unzipping it, and running demo.htm. The A-law demonstration is above and the µ-law demonstration
is below.
Why is file size not related to bit rate?
| Channel(s) |
Speech Coder |
Total Data Rate |
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| 1 Channel with randomly occurring 200 ms losses. Loss rate is 11%. |
Conventional G.711 PCM |
64 kbps |
a80_11.wav |
| Conventional G.711 PCM with G.711 Appendix I PLC |
64 kbps |
a80_11_PLC.wav |
| 2 Channels each with randomly occurring 200 ms losses. Loss rate for each channel is 11%. |
SDVQ-PCM, b=4 bits/sample/channel |
64 kbps |
a4_11.wav |
| SDVQ-PCM, b=5 bits/sample/channel |
80 kbps |
a5_11.wav |
| SDVQ-PCM, b=6 bits/sample/channel |
96 kbps |
a6_11.wav |
| A-law Lossy Channel Examples |
| Channel(s) |
Speech Coder |
Total Data Rate |
|
| 1 Channel with randomly occurring 200 ms losses. Loss rate is 11%. |
Conventional G.711 PCM |
64 kbps |
u80_11.wav |
| Conventional G.711 PCM with G.711 Appendix I PLC |
64 kbps |
u80_11_PLC.wav |
| 2 Channels each with randomly occurring 200 ms losses. Loss rate for each channel is 11%. |
SDVQ-PCM, b=4 bits/sample/channel |
64 kbps |
u4_11.wav |
| SDVQ-PCM, b=5 bits/sample/channel |
80 kbps |
u5_11.wav |
| SDVQ-PCM, b=6 bits/sample/channel |
96 kbps |
u6_11.wav |
µ-law Lossy Channel Examples |
Demonstration of Complementary Asymmetric Dual Vector Quantizer PCM (CAVQ-PCM) Speech Coding
The 60 speech files associated with the two tables below can be downloaded in a single file at
/audio/sdvqpcm/.
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