TDM with PCM question
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From: bos1234 on 21 Jun 2010 09:49 The information in four analog signals is to be multiplexed and transmitted over a telephone channel that has a 400- to 3100-Hz passband. Each of the analog baseband signals is bandlimited to 500 Hz. Design a communication system (block diagram) that will allow the transmission of these four sources over the telephone channel using a) TDM using PCM (assume 4-bit samples). Am I right in assuming this. Each pulse has a width of 1/2nW. Tranmission rate is 2nW/second where W is the bandwidth and n is bits/sample 2*4*500/sec = 4kbps/sec Therefore this scheme will work only if the line can support a data rate of 16 kbps in a bandwidth of 2700 Hz. HOWEVER ANSWER SAYS 16KPBS/SEC
From: Jerry Avins on 22 Jun 2010 23:28
On 6/21/2010 9:49 AM, bos1234 wrote: > The information in four analog signals is to be multiplexed and transmitted > over a telephone channel that has a 400- to 3100-Hz passband. Each of the > analog baseband signals is bandlimited to 500 Hz. Design a communication > system (block diagram) that will allow the transmission of these four > sources over the telephone channel using > > a) TDM using PCM (assume 4-bit samples). > Am I right in assuming this. Each pulse has a width of 1/2nW. Tranmission > rate is 2nW/second where W is the bandwidth and n is bits/sample Probably not. Explain the reasoning that led you to this assumption. (Why 4 bits? Is that assumed in the homework problem?) > 2*4*500/sec = 4kbps/sec > > Therefore this scheme will work only if the line can support a data rate of > 16 kbps in a bandwidth of 2700 Hz. > > > HOWEVER ANSWER SAYS 16KPBS/SEC Jerry -- Engineering is the art of making what you want from things you can get. ����������������������������������������������������������������������� |