SAME PROGRAM IDENTIFYING DEVICE

PURPOSE:To easily and properly decide the identity of programs by using the signal level, the noise level and the modulation degree as parameters and then varying the offset width of a blind sector area with each parameter. CONSTITUTION:The demodulation outputs of a main tuner part A and a subtuner part B are fetched into a same program identifying circuit 3 which identifies the identity of programs with detection and comparison of the zero cross points. A reception quality deciding circuit 5 fetches the level detection result of the IF amplifier stages of both parts A and B and the noise component extracted from each demodulated signal and also fetches the detection result of the modulation degree detected out of the demodulated signal of the part A. A system controller 4 varies the width of the blind sector area where the zero cross point is detected by the circuit 3. The controller 4 also controls a main PLL 7a and a sub-PLL 7b and then controls the synchronization between both parts A and B. Thus the identity of programs can be properly decided.