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:
Oct. 05, 1999
Filed:
Oct. 15, 1996
Yutaka Shimizu, Ota, JP;
Kazunori Chida, Ota, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
An input video signal is reduced according to size reduction ratio data K in an input processing section and written into alternate field memories. The written reduced video signal is alternately read from the field memories in a display processing section and processed for window displaying. Video reduction control sections are provided on the respective input and display sides, so that various signals, such as RHOLD, ADCANS, RACK signals, etc., are exchanged therebetween. When a size reduction ratio data K is changed, on the display side a read memory is fixed on a first field memory and size data is fixed, while on the write side video data is written into a second field memory, based on the new reduction ratio. After updating the size data on the display side, video data is read from the second field memory at the new reduction ratio. When reading and writing operations with respect to the second field memory are finished, fixing of the respective memories is released, whereby a signal processing operation returns to a normal operation.