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. 05, 1977
Filed:
Jun. 23, 1975
Yukinobu Ishigaki, Yamato, JA;
Hiroshi Matsushima, Neyagawa, JA;
Matsushita Electric Industrial Co., Ltd., Kadoma, JA;
Victor Company of Japan, Limited, Yokohama, JA;
Abstract
A multichannel record disc recording system comprises operation circuits for forming first and second sum signals and first and second difference signals respectively, from the signals of two pairs of channels, or a total of four channels. The first and second difference signals are angle modulated. When at least one of the first and second sum signals exceeds a predetermined level, a control signal is formed to control the levels of the first and second angle-modulated difference signals. The first sum signal and the first angle-modulated difference signal are level controlled and multiplexed. The second sum signal and the second angle-modulated difference signal are also level controlled and multiplexed thereby to produce multiplexed signals for recording on a record disc.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile