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:
Sep. 09, 1980
Filed:
Oct. 10, 1978
Masayoshi Hirashima, Ibaraki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A system for receiving a bi-level information signal multiplexed with a television signal or the like comprises a receiving circuit for receiving the television signal on which the bi-level information signal such as a still image video signal is superimposed during a vertical retrace period, an upper level detecting circuit for detecting an upper level of a start signal indicative of a reference phase and a reference amplitude inserted at a leading portion of the information signal and a lower level detecting circuit for detecting a lower level of the start signal. In response to output signals from the upper and lower limit detecting circuits, a slicing level of a slice circuit to which the information signal is fed is automatically controlled to a predetermined level so that the waveform is always reshaped at an exact slice level regardless of variations in the transmitted information level in order to assure exact reproduction of the information signal.