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, 1994
Filed:
Sep. 09, 1992
Applicant:
Inventor:
Jun Hirai, Kyoto, JP;
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330 51 ; 330149 ; 330307 ;
Abstract
As a switch circuit SW1 is incorporated in an integrated circuit, the number of IC terminals is proportionately reducible. On receiving a mute input signal Min, a mute circuit 13 generates a mute control signal M1 and subsequently a mute control signal M2 later than M1. On receiving the mute control signal M1, the switch circuit SW1 grounds the signal line of an audio output signal A, whereas on receiving the mute control signal M2, a switch circuit SW2 cuts the signal line of an audio input signal I later. A muting function can thus be fulfilled stably.