(1). The symbol rate of 16-ary digital signal is 1200Bd, then the corresponding information rate is If with the same information rate, the symbol rate of 8-ary digital signal is_____( ) A. 1600b/s, 1200Bd B. 1600b/s, 3200Bd C. 4800b/s, 2400B D. 4800b/s, 1600B (2). The Power Spectral Density (PSD) function is the Fourier Transform of the ( ). A. Transfer Function B. Impulse Response C. Autocorrelation Function D. Time Average (3). Envelope detectors are used for demodulating the information signal if the modulation type is ( ). A. DSB B. PM C. AM D. SSB (4). The type of modulation which is a nonlinear function of the message signal is ( ). A. FM B. DSB C. AM D. VSB (5). The Quantization Error (Noise) of a PCM signal can be decreased by ( ). A. reducing the sampling interval B. reducing the number of quantization levels increasing the number of quantization levels C. increasing the signal voltage D.