Two low pass signals, each band limited 4KHz, are to be time multiplexed into a single channel using PAM. Each signal is impulse sampled at a rate 10KHz. The time multiplexed signal waveform is filtered by an ideal LPF before transmission. (1) What is minimum clock frequency of the system. (2) What is the minimum cut off frequency of the LPF. (3) In the receiver side, determine the minimum and maximum acceptable bandwidth of the LPF used in retrieving the analog signal. Ans. (1) 20KHz (2) 10KHz (3) 4KHz, 6KHz