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:
Mar. 02, 1982
Filed:
Aug. 01, 1980
Shin Fukuda, Hirakata, JP;
Masayoshi Hirashima, Ibaraki, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A signal processing system in a transmission system like Teletext System in which a binary signal is superimposed on a television signal for transmission is disclosed. When the binary signal is received, an upper (or lower) level of a pilot signal in the binary signal is clamped to a first reference voltage by a clamp circuit while the amplitude of the pilot signal is controlled by a variable gain amplifier such that the lower (or upper) level of the pilot signal becomes equal to a third reference level. The binary signal is then amplitude-discriminated using a second reference voltage as a discrimination reference. In this manner, the binary signal is correctly converted to a digital signal.