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1. In a channel voice coder, the outputs of sixteen 20 Hz low pass filters are sampled, multiplexed and A/D converted. If sampling is at 40 samples/second and 3 bits/sample represents each voltage sample, the bit rate is about
(A): 0.95 k bits/sec
(B): 1.9 k bits/sec
(C): 3.8 k bits/sec
(D): 7.6 k bits/sec
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