VOICE CONTROL SIGNAL DETECTION CIRCUIT OF SATELLITE BROADCASTING SYSTEM

摘要

The circuit detects control bits from pulse code modulation audio signal nd checks that each bit of the control bits is the same for a certain number of frames to discriminate error of audio control signal. The circuit comprises a control bit detector (1) for detecting control bit by shifting PCM audio signal, a discriminator (2) for discriminating that state of each bit of the control bits ae the same for a certain number of frames, and a discriminating period setting unit (3) for setting period of discrimination of the discriminator.