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:
Mar. 31, 1998
Filed:
Dec. 19, 1995
Shozo Into, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
In a key signal waveform shaping apparatus which includes an adder 1 for supplying a key source signal KS with a gain of a predetermined slice level, a multiplier 2 for extending a signal offset by the adder 1 by multiplication of a gain, and a first limiter circuit 3 for converting the signal extended by the multiplier 2 by cutting an upper limit value and lower limit value of the extended signal. A limit value generating circuit generates an upper limit value and lower limit value from the signal offset by the adder 1. The key signal K is obtained by further limiting the output of the first limiter circuit 3 by the upper limit value and the lower limit value. The present invention provides a key signal waveform shaping apparatus in which an error of an edge position of a key signal can be removed and in which the quality of a synthesized picture can be improved.