Problem 4: Two lowpass signals each band limited to 3 KHz are to be time multiplexed into a single channel using PAM. Each signal is impulse sampled at frequency of 50% above the Nyquist frequency. The time multiplexed signal wave form is filtered by an ideal LPF before transmission.

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Problem 4:
Two lowpass signals each band limited to 3 KHz are to be time multiplexed into a single
channel using PAM. Each signal is impulse sampled at frequency of 50% above the
Nyquist frequency. The time multiplexed signal wave form is filtered by an ideal LPF
before transmission.
fi(t)
LPF
PAM
Signal
Sampler
f2(t)
LPF
Pulse
Clock
Gen.
a. What is the minimum clock frequency of the system?
b. What is the minimum cutoff frequency of the LPF?
c. In the receiver, the signal is impulse sampled and demultiplexed using the system
shown, determine the minimum and maximum acceptable BW of the LPF used in
retrieving the analog signals.
Transcribed Image Text:Problem 4: Two lowpass signals each band limited to 3 KHz are to be time multiplexed into a single channel using PAM. Each signal is impulse sampled at frequency of 50% above the Nyquist frequency. The time multiplexed signal wave form is filtered by an ideal LPF before transmission. fi(t) LPF PAM Signal Sampler f2(t) LPF Pulse Clock Gen. a. What is the minimum clock frequency of the system? b. What is the minimum cutoff frequency of the LPF? c. In the receiver, the signal is impulse sampled and demultiplexed using the system shown, determine the minimum and maximum acceptable BW of the LPF used in retrieving the analog signals.
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