guess.who
2009-08-11, 05:57 PM
Hi guyz..
i know the basic building blocks are
A/D
Speech Coding
Channel Coding
Interleaving
Encryption and then transmission... but i am confused abt the data rates....specially the first step...
at one place i have read that A/D conversion of speech is done at 8Kbps(13 bits) and then speech coding reduces/compresses the size to 13 kbps.... How is 13 kbps smaller than 8 kbps.....??
and at another place i have read GSM uses PCM (64kbps) to digitize voice and then uses speech coding ...with this statement the compression justifies itself....
So is it 8Kbps or 64Kbps...If 64 then what did the writer try to meant in the first statement....
Thanks in advance...
i know the basic building blocks are
A/D
Speech Coding
Channel Coding
Interleaving
Encryption and then transmission... but i am confused abt the data rates....specially the first step...
at one place i have read that A/D conversion of speech is done at 8Kbps(13 bits) and then speech coding reduces/compresses the size to 13 kbps.... How is 13 kbps smaller than 8 kbps.....??
and at another place i have read GSM uses PCM (64kbps) to digitize voice and then uses speech coding ...with this statement the compression justifies itself....
So is it 8Kbps or 64Kbps...If 64 then what did the writer try to meant in the first statement....
Thanks in advance...