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:
Jan. 28, 1997
Filed:
Nov. 23, 1994
Ryuichi Yamaguchi, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
After limited in band area with a vertical or horizontal low-pass filter in a sub-sampling circuit at the image-signal transmitting side, an image signal is sub-sampled as inter-frame offset in the form of a quincunx, and then transmitted to an image-signal receiving side through a transmission system. The sampling rate of the image signal thus received is converted by a sampling rate conversion portion. According to the operation of a changeover switch by the operator who watches a Braun tube for image reproduction, a selector selects the image signal interpolated with a vertical filter of a low-pass portion when the sub-sampling circuit uses a vertical filter, or the image signal interpolated with both vertical and horizontal low-pass filters when the sub-sampling circuit uses a two dimensional filter. Thus, there is supplied an image signal which has been interpolated with a low-pass filter of which transmissible band area is identical with or approximate to that of the low-pass filter in the sub-sampling circuit at the signal transmitting side, such that the image signal contains no aliasing interference of a spatial frequency band area. Thus, there can be reproduced a good picture in which a horizontal straight line is not displayed as a broken line.