Hi-fi Noise Prevention Device by Deviation of Video Head and Noise Prevention Method Thereof

摘要

Disclosed is a hi-fi noise prevention apparatus and a noise prevention method by a deviation of a video head according to the present invention.;A luminance signal amplifying unit for FM-modulating a luminance signal obtained by separating a luminance component and a chrominance component of an input video signal, inputting a modulated signal and adjusting an amplification gain by a predetermined control signal, A chrominance signal amplifying unit for converting the input chrominance signal into a chrominance signal and a chrominance signal amplifying unit for inputting the converted chrominance signal and controlling the amplification gain by a predetermined control signal, a mixing unit for mixing and outputting the signals output from the amplifying units, In the video cassette recorder for amplifying and outputting the signal output from the mixer, an apparatus for preventing the hi-phi noise generated during the reproduction due to the deviation of the video head includes a voice signal picked up from a predetermined hi-fi head A preamplifier for amplifying a high-frequency reproduction FM signal and outputting a high-frequency reproduction FM signal; Storage unit, for storing a predetermined reference value of the envelope; by entering the call envelope detector for detecting an envelope values of the FM signal; And a microprocessor for inputting an envelope value output from the envelope detection unit and controlling a gain of the amplification units according to a result of comparison with a predetermined reference envelope value stored in the storage unit.;As described above, according to the present invention, the recording current of the video head is controlled by the envelope value at the time of reproduction, unlike the conventional technique of discarding all the drum arrays where high-Thereby preventing the high-frequency noise caused by the video head, thereby improving the productivity and preventing the loss of the material.