Television by Pulse Code Modulation*

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.