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:
Jun. 21, 1994
Filed:
Sep. 22, 1993
Susumu Yamaguchi, Nishinomiya, JP;
Chiyoko Matsumi, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A recording and reproducing apparatus suitable for keeping the secrecy of video and audio signals recorded in, for example, a video tape recorder for private use to a high degree. A recording portion of the recording and reproducing apparatus is provided with an identification code input device, an operation designating device and an operation circuit. Further, a reproducing portion of the recording and reproducing apparatus is provided with an operation identification device and a comparator. When recording video and audio signals, a scramble pattern for scrambling the video and audio signals is generated from an input identification code to scramble the video and audio signals. Further, a predetermined operation is performed on the input identification code to produce a first ID signal representing a result of the operation. Then, the scrambled video and audio signals, the first ID signal and an operation identification signal indicating data designating the operation are recorded. When reproducing the video and audio signals, the predetermined operation designated by the operation identification signal is performed on an identification code input from the exterior of the apparatus. Then, a second ID signal representing a result of this operation is compared with the first ID signal reproduced by the reproducing portion. Subsequently, a descrambling is performed on the scrambled video and audio signals according to a result of the comparison.