A designer is asked to design a digital transmission system where the quantizati
ID: 2083470 • Letter: A
Question
A designer is asked to design a digital transmission system where the quantization distortion error of any audio source does not exceed of the peak-to-peak audio source.
If the audio signal bandwidth and the allowable transmission bandwidth are each 8000 Hz, and the sampling takes place at the Nyquist rate, what value of bandwidth efficiency (bits/s/Hz) is required? (9 Marks)
Repeat part (a) except that the audio signal bandwidth is now 20 kHz (the available transmission band width is still 8000 Hz). (6 Marks)
Find symbol rate in part (a) if 16-level (M=16) M-ary PAM transmission system is used.
Please answer this Q in deatails
A designer is asked to design a digital transmission system where the quantization distortion error of any audio source does not exceed of the peak-to-peak audio source.
If the audio signal bandwidth and the allowable transmission bandwidth are each 8000 Hz, and the sampling takes place at the Nyquist rate, what value of bandwidth efficiency (bits/s/Hz) is required? (9 Marks)
Repeat part (a) except that the audio signal bandwidth is now 20 kHz (the available transmission band width is still 8000 Hz). (6 Marks)
Find symbol rate in part (a) if 16-level (M=16) M-ary PAM transmission system is used.
Please answer this Q in deatails
Explanation / Answer
(1) bandwidth efficiency=transmission bandwidth/system bandwidth=2fm/8000=(2*8000)/8000=2
(2) bandwidth efficiency=(2*20000)/8000=5
(3) Symbol rate=fm/4=8000/4=2000 symbols/sec
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