Chrominance signal recording and reproducing apparatus
AssigneeHitachi, Ltd.
InventorsOsamu Takase, Tomomitsu Kuroyanagi
Life of this patent
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Abstract
A chrominance signal recording and reproducing circuit for a video tape recorder in which a frequency-modulated luminance signal and a low-frequency converted chrominance signal are mixed to be recorded and reproduced. A sideband emphasis type dynamic emphasis circuit composed of a diode limiter circuitry and an LC trap circuitry is provided in a recording system for recording the chrominance signal, while a sideband deemphasis circuit composed of at least a diode limiter circuitry and an LC trap circuitry is provided in a chrominance signal reproducing system. A circuit configuration is adopted in which the functions of the emphasis circuit and the deemphasis circuit are exchangeably performed by a common circuit.
Claims19
A chrominance signal recording and reproducing apparatus for a video tape recorder in which a luminance signal modulated in frequency is mixed with a low-frequency converted chrominance signal to be recorded and reproduced, comprising:
- emphasis means provided in a chrominance signal recording circuit chain for emphasizing side bands of said chrominance signal when said chrominance signal is at a low level;
- and
- deemphasis means provided in a chrominance signal reproducing circuit chain and having characteristic reciprocal to that of said emphasis means for deemphasizing said chrominance signal.
A chrominance signal recording and reproducing apparatus for a video tape recorder including a signal extracting circuit for extracting separately a chrominance signal from a video signal containing a luminance signal and the chrominance signal, first conversion means for converting the chrominance signal extracted through said chrominance signal extracting means to a low-frequency band to obtain a low-frequency chrominance signal, recording/reproducing means for recording said low-frequency chrominance signal output of said first conversion means on a recording medium together with said luminance signal and reproducing said signals, and second conversion means for converting said low-frequency converted chrominance signal reproduced through said recording/reproducing means to the original chrominance signal;
- further comprising:
- an emphasis/deemphasis circuit for emphasizing side bands of said chrominance signal of small amplitude upon recording and deemphasizing said chrominance signal upon reproduction.
Dependencies are inferred from the claim text.