VIDEO AND SOUND SIGNAL RECORDING DEVICE
PURPOSE:To reduce cross talk of an FM-modulated sound signal by preventing a coincidence in the frequency transition band of the FM-modulated sound signal and a coincidence in adjacent carrier frequency on slanting track formed by two rotary magnetic heads. CONSTITUTION:Left and right sound signals...
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Sprache: | eng |
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Zusammenfassung: | PURPOSE:To reduce cross talk of an FM-modulated sound signal by preventing a coincidence in the frequency transition band of the FM-modulated sound signal and a coincidence in adjacent carrier frequency on slanting track formed by two rotary magnetic heads. CONSTITUTION:Left and right sound signals SL and SR are inputted to FM modulators 6 and 7, and 11 and 12 through amplifying circuits 3 and 8, noise reducing circuits 4 and 9, and pre-enhancing circuits 5 and 10. Then, FM signals LF1-LF4 which have different frequency shift bands and frequencies increasing gradually are passed through band-pass filters 13-16 to input a couple of signals to mixing circuits 19 and 20 through mixing and amplifying circuits 17 and 18 alternately, thereby mixing a chrominance signal from a terminal 21 with an FM-modulated luminance signal from a terminal 22. Mixture outputs M1 and M2 are sent through recording and amplifying circuits 23 and 25 to rotary magnetic heads to form slanting tracks at different azimuth angles. Thus, sound signals of plural channels are separated excellently to reduce cross talk between adjacent tracks. |
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