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, 2011
Filed:
Jan. 09, 2007
Hiroyuki Toda, Hamamatsu, JP;
Hiroyuki Toda, Hamamatsu, JP;
Yamaha Corporation, , JP;
Abstract
An adder mixes an L-channel sound signal and an R-channel sound signal with each other and then outputs a mixed signal. A switching unit performs a switching operation such that, if power is being supplied to loudspeaker amplifiers, the L-channel sound signal and the R-channel sound signal are respectively supplied to the loudspeaker amplifiers, and if power is not being supplied to the loudspeaker amplifier, an output signal of the adder is supplied to the loudspeaker amplifier. A power down control unit forces a loudspeaker amplifier to which power is not supplied and a preamplifier for driving the loudspeaker amplifier to be in a power-down state.