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. 30, 2002
Filed:
Jul. 01, 1997
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
There is provided a low-cost scanning line converting circuit being capable of properly converting the number of scanning lines for a video signal at various conversion ratios. Under the control of a write control signal generating circuit, an original video signal is written, on a scanning-line basis, in individual line memories. A write operation is performed to each of the line memories based on a clock and a horizontal synchronizing signal on the input side, while a read operation is performed to each of the line memories based on a clock and a horizontal synchronizing signal on the output side. A selecting circuit selects, based on a line select signal, at least one from scanning line signals stored in the individual line memories necessary to generate a post-conversion scanning line signal and outputting the selected scanning line signal. Coefficient multipliers multiply the scanning line signal selectively outputted by interpolation coefficients (1−k) and k and an adder adds up the results of multiplication to output the sum as the post-conversion scanning line signal. A coefficient control circuit and a dividing circuit are capable of generating a coefficient direct signal k in accordance with a ratio for converting the number of signal lines.