Question

4. [10 marks] The standard spectrum of a regular telephone line that is used, via modems, to transmit digital data is 300 to 3400 Hz. The signal-to-noise ratio is 40 dB. What is the capacity of the channel? If we assume that just 85% of the theoretical limit can be reached, derive from the Nyquist formula, the number of signal levels required?

Answer 1

nd widt 3400H2 sijmar -bo-neise yode CaPsCitY ofCRanner 6:3400H2 NT N 12 C: Sxl10ooor Sx10 x13 ayPPxok ASx 1Y

F8thmuras many Signas how A&VEAS ne6d 6SX10000 481 100×80木1S-2メ3400 イ032m 76.4708101 2 M1.88 3 No of ACVC xevired1833