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In a digital telephone exchange voice signal is digitalized using 8- bits PCM. Calculate the final bit rate of the system. Voice: 300HZ3.4KH,BW=3KHZ
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Solution:

Steps involved in analog to digital conversion,

1) Sampling CT - DT

2) Quantization CA-DA

3) Encoding

fs2fm samples / sec Critical rate / Nyquist rate: fs=2fm

fs=2×3.4k=6800 samples / sec 

Practical rate:

fs>2fm

fs=8000 samples / c

Sampling period: T=1/fs

T=1/8000=125μs samples /c

Bit rate : Rs=n.fs bits /sec

=8 bits / sample ×8000 samples /sec=64000 bits /sec

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