Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Institute for Telecommunication Sciences / Resources / Audio Quality Research / Multiple Description PCM Examples

Multiple - Description PCM Speech Coding Examples

All the .wav files presented on this page are available in a single zip file.

Demonstration of Structured Dual Vector Quantizer PCM (SDVQ-PCM) Speech Coding

SDVQ-PCM A-law Speech Coder Examples
b
(bits/sample/channel
Both Channels Working Only Channel 1 Working Only Channel 2 Working
4 a4b.wav a4x.wav a4y.wav
5 a5b.wav a5x.wav a5y.wav
6 a6b.wav a6x.wav a6y.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 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

 

Conventional G.711 A-law PCM Speech Coder Examples
b
(bits/sample/channel
 
4.0 a40.wav
4.5 a45.wav
5.0 a50.wav
5.5 a55.wav
6.0 a60.wav
6.5 a65.wav
7.0 a70.wav
7.5 a75.wav
8.0 a80.wav

 

SDVQ-PCM µ-law Speech Coder Examples
b
(bits/sample/channel
Both Channels Working Only Channel 1 Working Only Channel 2 Working
4 u4b.wav u4x.wav u4y.wav
5 u5b.wav u5x.wav u5y.wav
6 u6b.wav u6x.wav u6y.wav

 

µ-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

 

Conventional G.711 µ-law PCM Speech Coder Examples
b
(bits/sample/channel
 
4.0 u40.wav
4.5 u45.wav
5.0 u50.wav
5.5 u55.wav
6.0 u60.wav
6.5 u65.wav
7.0 u70.wav
7.5 u75.wav
8.0 u80.wav

 

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/.

CAVQ-PCM A-law Speech Coder Examples
b
(bits/sample/channel)
r
(aspect ratio)
Both Channels Working Only Channel 1 Working Only Channel 2 Working
4 1.0 a4_a_b.wav a4_a_x.wav a4_a_y.wav
4 3.6 a4_b_b.wav a4_b_x.wav a4_b_y.wav
4 6.8 a4_c_b.wav a4_c_x.wav a4_c_y.wav
4 10.5 a4_d_b.wav a4_d_x.wav a4_d_y.wav
5 1.0 a5_a_b.wav a5_a_x.wav a5_a_y.wav
5 4.0 a5_b_b.wav a5_b_x.wav a5_b_y.wav
5 9.0 a5_c_b.wav a5_c_x.wav a5_c_y.wav
6 1.0 a6_a_b.wav a6_a_x.wav a6_a_y.wav
6 2.0 a6_b_b.wav a6_b_x.wav a6_b_y.wav
6 9.0 a6_c_b.wav a6_c_x.wav a6_c_y.wav

 

CAVQ-PCM µ-law Speech Coder Examples
b
(bits/sample/channel)
r
(aspect ratio)
Both Channels Working Only Channel 1 Working Only Channel 2 Working
4 1.0 u4_a_b.wav u4_a_x.wav u4_a_y.wav
4 3.6 u4_b_b.wav u4_b_x.wav u4_b_y.wav
4 6.8 u4_c_b.wav u4_c_x.wav u4_c_y.wav
4 10.5 u4_d_b.wav u4_d_x.wav u4_d_y.wav
5 1.0 u5_a_b.wav u5_a_x.wav u5_a_y.wav
5 4.0 u5_b_b.wav u5_b_x.wav u5_b_y.wav
5 9.0 u5_c_b.wav u5_c_x.wav u5_c_y.wav
6 1.0 u6_a_b.wav u6_a_x.wav u6_a_y.wav
6 2.0 u6_b_b.wav u6_b_x.wav u6_b_y.wav
6 9.0 u6_c_b.wav u6_c_x.wav u6_c_y.wav