Post-processing of “Pulse code modulation” encoder output to downtick bit rates for voice transmission

Abstract: This paper presents a technique for Post-processing of the digital output obtained by encoding an analog voice signal using an 8-bit Pulse code modulation (PCM) encoder sampled at 8 KHz, to decrease the bit rate from 64 Kbps to 56 Kbps without decreasing the number of encoding levels or sampling frequency. Further, the paper the adavantages of such reduction in practical applications is discussed in detail. It is observed that using the proposed technique there is a reduction in bit rate by 12% approximately and the number of voice calls a channel of given bandwidth can support is increased by around 15%.

Keywords: Voice, Coding, Channel bandwidth, bit rates.