B21 (20 points)
Two signals, mi(t) and m2(t), are to be sampled, quantized, and multiplexed for transmission by
binary signaling. Each of the signals has a bandwidth of 2 kHz. The samples of the signalia(t) is uniformly distributed between —1.5 volts and 1.5 volts. The RMS value of the samples of the signal m2(t) is one tenth the peak amplitude. Both signals are sampled at twice the Nyquist rate. Each of the
signals must have a minimum 51.N& of 46 dB. Three types of quantizers are available: (1) uniform quantizer, (2) p.-law quantizer with g— 255 and (3) A-law with A=87.6. Zero overhead is assumed for framing and synchronization. Choose appropriate quantizer for each signal to minimize the data rate and determine the minimum transmission bandwidth in kHz.