This takes up more bandwidth in wireless channel transmission.Īs we know bandwidth is very scarse resource in wireless system based communication. Number of bits needed to represent steps are important for A to D conversion.īased on the above techniques,single voice channel data rate is about 64 Kbps in PCM (Pulse Code Modulation) standard. (differential step up or down) or absolure level. ADC converter samples level of voice signal and transmitsīit stream of ones and zeros in order to indicate either relative In order to use digital modulation, analog voice signal is converted into digital. Now-a-days BPSK, QPSK, 16QAM, 64QAM modulations are widely used. This digital data is modulated on transmitted carrier usingĭigital modulation techniques such as ASK, PSK, FSK etc. In current generation wireless standards such as 2G, 3G and 4G voice us transformed intoĭigital 1's and 0's. This was prevalent in first generation analog systems. This used to occupy more bandwidth on the channel. This page explains vocoding basics.It mentions vocoder device and basic function of it.Įarlier days voice was transmitted without applying any compression method
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