, , , , GSM . : ( ), , ( ). MS, .
.
, . , , .. , . GSM .
, , 20 . GSM 20 .
2.28
. 50 8000, - .
2.5.3. [4] (Speech Coding)
13 , - , 260 . , 50*260 = 13 /. , PSTN.
2.29
. (waveform coders ). , (vocoders). GSM (Hybrid Coders), .
GSM 13 / . , 8 8*13 / = 104 /. - 832 /.
. :
()