

230000001276 controlling effect Effects 0.000 claims description 5.230000015654 memory Effects 0.000 claims abstract description 83.239000000203 mixture Substances 0.000 title claims abstract description 14.Assignors: IIJIMA, TAKAYUKI, TAKAHASHI, HIROSHI Application granted granted Critical Publication of US4991014A publication Critical patent/US4991014A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to JP3733087 priority Critical Priority to JP62-37330 priority Application filed by NEC Corp filed Critical NEC Corp Assigned to NEC CORPORATION reassignment NEC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST.

Original Assignee NEC Corp Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/159,240 Inventor Hiroshi Takahashi Takayuki Iijima Current Assignee (The listed assignees may be inaccurate.
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Google Patents Key signal producing apparatus for video picture compositionĭownload PDF Info Publication number US4991014A US4991014A US07/159,240 US15924088A US4991014A US 4991014 A US4991014 A US 4991014A US 15924088 A US15924088 A US 15924088A US 4991014 A US4991014 A US 4991014A Authority US United States Prior art keywords key signal key output signal memory Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4991014A - Key signal producing apparatus for video picture composition US4991014A - Key signal producing apparatus for video picture composition
