The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1979
Filed:
Aug. 16, 1977
Hideshi Tamaru, Sagamihara, JP;
Sony Corporation, Tokyo, JP;
Abstract
In a color television receiving circuit, a color-demodulating subcarrier signal produced by an oscillator is applied through a first variable phase shifter and further through a second variable phase shifter to a color demodulator circuit. The subcarrier signal, after passing through only the first variable phase shifter, is applied to a second color demodulator circuit provided particularly for hue error detection. When a received composite color television signal includes a vertical interval reference (VIR) signal, the detected output from the hue-error demodulator circuit is used to control the amount of phase shift of the first variable phase shifter, thereby automatically correcting the color hue. On the contrary, when the received signal does not include the VIR signal, the amount of phase shift of the first variable phase shifter is constant. The amount of phase shift of the second variable phase shifter can be changed by a common adjusting variable resistor irrespective of whether the VIR signal is present or not and hence the color hue can be preferentially adjusted.