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Transmission by pulse code modulation presents inviting possibilities in the field of television in that information may be relayed by many repeater stations without deterioration. In a PCM system, the informal ion signal is periodically sampled and its instantaneous amplitude described by a group of pulses according to a pec-set code. These pulse groups occur at the sampling rate and constitute the transmitted signal. In this process an operation known as amplitude quantization is required.
W.M. Goodall (Mon,) studied this question.