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:
Sep. 25, 1975
Victor Company of Japan, Limited, Yokohama, JA;
Abstract
A multichannel record disc recording system comprises circuits for forming first and second sum signals and first and second difference signals respectively from signals of two different channels of four channels. The first and second difference signals, are angle modulated and, a control signal is formed in accordance with the level of at least one of the first and second sum signals and the level of at least one of the first and second difference signals. The levels of the first and second angle-modulated signals are controlled in accordance with the control signals thus formed. Circuits are provided for multiplexing the first sum signal and the first angle-modulated difference signal thus level controlled, and for multiplexing the second sum signal and the second angle-modulated difference signal thus level controlled. These multiplexed signals are then recorded on a record disc. The control signal forming circuit forms a control signal when the level of at least one of the first and second sum signals is higher than a first specific level and when it is lower than a second specific level, which is lower than the first specific level. The control signal forming circuit, detects a condition wherein the levels of the first and second sum signals are lower than the second specific level which is lower than the first specific level. Moreover, a control signal is formed when the levels of the first and second difference signals are lower than a third relatively low specific level.