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Twenty signals each of 5 kHz bandwidth are sampled and multiplexed at a rate of 20,000...

Twenty signals each of 5 kHz bandwidth are sampled and multiplexed at a rate of

20,000 samples/s. Each sample is then coded into six binary digits. Find the PCM output rate and the channel bandwidth. What will be the output bit rate if instead of binary pulses four-level pulses are transmitted?

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