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29. Which is not true about Digital transmission? (a) is used to send digital signals in a communication system (b) it uses digital modulation technique to encode analog information into digital signal for transmission (c) it uses signal regeneration rather than amplication (d) it is more noise resistant than analog systems 31.A PCM system has the following parameters: a maximum analog input frequency of 4.5khz, a maximum decoded voltage at the receiver of +-5V, and a minimum dynamic range of 60dB. Determine the minimum number of bits used in the PCM code. 33. Which of the following statement is not true about companding? (a) Companding is the process of compressing and then expanding (b) Companding increases the dynamic range of small signals (c) Companding prioritizes small amplitude signals than large amplitude signals (d) all of the choices (e) none of the choices