PCM

Pulse-code modulation. The form of modulation in which the information signals are sampled at regular intervals and a series of pulses in coded form are transmitted representing the amplitude of the information signal at that time. For T1 applications, a method of converting successive (every 125 us) analog samples of a voice waveform to successive 8-bit codes, to be transmitted in an 8-bit timeslot of a T1 frame. In "robbed bit" frames, only the most significant 7 bits are used to encode the sample. The total bit rate for such a channel is (8000 samples/sec) x (8-bits/sample) = 64000 bits/sec.

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