Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1985-06-12
1987-03-10
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 968
Patent
active
046494200
ABSTRACT:
A tilt correction circuit for a color television signal processor includes a differential amplifier having a first tuned circuit tuned near the color carrier frequency and a second tuned circuit tuned near the picture carrier frequency. An IF video input signal is applied to the differential amplifier, the output of which reflects the relative effect of the two tuned circuits. A correction voltage is derived by peak detecting the color burst and comparing it with a reference voltage related to a nominal color burst level in a color television signal. The correction voltage is supplied to the other input of the differential amplifier to change the relative effects of the tuned circuits to adjust the frequency response over the IF band. A tilt defeat circuit is included for disabling the correction voltage where the magnitude of the correction voltage indicates the presence of a monochrome signal.
REFERENCES:
patent: 2917572 (1959-12-01), Stubbe
patent: 2934599 (1960-04-01), Holmes
patent: 4184173 (1980-01-01), Tamaru
patent: 4237476 (1980-12-01), Hanma et al.
patent: 4366498 (1982-12-01), Therrault
Kelly Gordon E.
Krishnamurthy Gopalan
Rypkema Jouke N.
Shepperd John W.
Zenith Electronics Corporation
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