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# 6.2-3 In a satellite radio system, 128 station of stereo quality are to be package in one data stream. For each station, Two (left and right) signals of bandwidth 15,000 Hz are sampled, quantized, and binary-cooled into PCM signals. The transmitter must multiplex the data from the 128 stations into a single stream via time multiplexing. (a) If the maximum acceptable quantization error in sample amplitude is 0.25% of the peak signal voltage, find the minimum number of bits needed for a uniform quantizer. (b) If the sampling rate must be 20% higher than the Nyquist rate, find the minimum bit rate of the multiplexed data stream based on the quantizer of part (a). (c) If 5% more bits are added to the multiplexed data for error protection and synchronization, determine the minimum bandwidth needed to transmit the final data stream to receivers.

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