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:
Apr. 15, 2003
Filed:
Apr. 10, 2000
Akihiro Ueyama, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
In an image output apparatus such as a television receiver or the like, a speed modulating circuit for modulating a scanning speed of an electron beam and emphasizing an outline of an image is provided. Reference numeral denotes a video amplifying unit for amplifying a video signal which is inputted by a baseband and driving a cathode ray tube; a differentiating circuit for detecting a change point of the video signal. A detected signal is adjusted to a predetermined level by a next waveform shaping circuit and further supplied through a variable gain amplifier , a signal synchronizing circuit , and an output amplifier to a scanning speed modulating coil provided in a neck portion of the CRT. Reference numeral denotes a waveform generating circuit for generating a parabolic signal to varying a modulation degree when the speed modulation is performed synchronously with a horizontal period; a sampling circuit for detecting, particularly, an average level of a luminance signal of peripheral portions of an image; and a maximum value detecting circuit for comparing a level of the signal generated from the waveform generating circuit with a level of a signal outputted from the sampling circuit and outputting the signal of the higher level. A gain of the variable gain amplifier is controlled by an output of the maximum value detecting circuit , thereby controlling a level of the speed modulation signal.