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. 06, 1983
Filed:
Sep. 01, 1981
Shigeyuki Ito, Yokohama, JP;
Yoshizumi Watatani, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In an apparatus for recording a frequency modulated audio signal and a frequency modulated video signal on the frequency multiplex basis onto the same recording track, a muting circuit is necessary so that the reproduced audio signal is not outputted when a dropout takes place and/or when the frequency modulated audio signal is missing on the track. The muting circuit is controlled not only by the output signal of a dropout detector, but by a signal obtained by integrating the dropout detection signal so that the audio output is blocked during a frequent occurrence of dropout. The muting circuit includes a previous value holding circuit serving to hold its output at an input level immediately before the control signal has been given, the previous value holding circuit being arranged in the reproduction audio signal processing system following a demodulator.