APPARATUS FOR PROCESSING MULTI-VOICE BROADCASTING SIGNALS IN MONO VCR

摘要

PURPOSE: A multi-voice broadcasting signal processor of a mono VCR(video cassette recorder) is provided to hear the sub-voice of a multi-voice broadcast from a VCR receiving only a mono broadcast. CONSTITUTION: In a normal mono broadcast mode, a contact point of a switching unit(25) is connected to a first filter(23) to filter first voice carrier frequency 4.5MHz output from a tuner(22). A first voice signal is detected from an FM(frequency modulation) detecting unit(28) through the resonance frequency of 4.5MHz from a resonance circuit unit(27). In selecting a foreign language, a control unit(21) controls the switching unit to connect the contact point with a second filter(24). An SIF signal filters second voice carrier frequency of 4.72MHz and the FM detecting unit outputs the voice signal from the second voice carrier frequency of 4.72MHz inputted depending on the resonance frequency of the resonance circuit. To change the resonance frequency of the resonance circuit into 4.72MHz, the control unit generates voltage to have a proper capacitance of a vector diode(VD).