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:
Apr. 10, 1984
Filed:
Oct. 29, 1981
Sony Corporation, Tokyo, JP;
Abstract
A video signal is recorded with the associated audio signal inserted as a PCM digital signal in the back porch portions of the horizontal blanking intervals. In order to prevent the video pre-emphasis that is used in high-density recording from degrading the PCM digital signal, the video signal and the PCM digital signal are provided with separate and independent degrees of pre-emphasis. Upon playback, the video signal and the PCM digital signal are provided with corresponding independent respective amounts for de-emphasis. In order to fit a sufficient number of bits into the blanking intervals to provide high quality audio, the back porch portion is first extended by replacing the standard horizontal synch pulses with narrow pulses, so that the following back porch portions are correspondingly elongated.