Question: A message signal m ( t ) , which is band - limited to 2 0 kHz , is sampled with a sampling rate of

A message signal m(t), which is band-limited to 20 kHz, is sampled with a sampling rate of fs. If an ideal LPF with a cut-off frequency of 60 kHz is used to reconstruct the signal m(t) from the sampled signal, then the minimum sampling rate (fs) required for the proper reconstruction is

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