Question

A special PCM system uses 32 channels of data, one whose purpose is an identification (ID) and synchronization. The sampling rate is 4 kHz. The word length is 5 bits. Find the serial data rate.
1. 1280 kHz
2. 160 kHz
3. 320 kHz
4. 640 kHz

Answer 1

Correct Answer - Option 4 : 640 kHz

The correct answer is option 4.

Calculation

serial data rate R_b = MnfS

channels (M) = 32

word length is (n) = 5 bits

sampling rate (fS) = 4 KHz

R_b = 32 × 5 × 4 KHz

               = 32 × 20 KHz

R_b = 640 KHz​ 

Hence the correct answer is 640 KHz 

     ∴ serial data rate Rb = MnfS