AMPLIFIER AND ACOUSTIC SYSTEM - MATSUSHITA ELECTRIC IND CO LTD

Title:

AMPLIFIER AND ACOUSTIC SYSTEM

Document Type and Number:

WIPO Patent Application WO/2005/076468

Kind Code:

A1

Abstract:

There are provided an amplifier capable of suppressing deterioration of an audio signal and an acoustic system having the amplifier. The acoustic system includes a first amplifier (13) having a first acoustic gain, amplifying an analog audio signal according to the first acoustic gain, and capable of modifying the first acoustic gain; a converter (14) for converting the analog audio signal into a digital audio signal; a second amplifier (15) having a second acoustic gain, amplifying the digital audio signal converted by the converter 14, according to the second acoustic gain, and capable of modifying the second acoustic gain; and a control unit (16) for modifying the second acoustic gain according to a change of the first acoustic gain and performing control so as to maintain the combined gain of the first acoustic gain and the second acoustic gain to be constant.

Inventors:

HIBINO MASAYUKI
MORIKAWA TADASHI

Application Number:

PCT/JP2005/001686

Publication Date:

August 18, 2005

Filing Date:

February 04, 2005

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC IND CO LTD (JP)
HIBINO MASAYUKI
MORIKAWA TADASHI

International Classes:

H03F99/00; H03G3/20; H03G3/30; H04R3/00; H04S1/00; (IPC1-7): H03G3/20; H03G3/30; H04R3/00

Foreign References:

JPH1051254A	1998-02-20
JPH08250947A	1996-09-27
JP2000224690A	2000-08-11
JPH09298433A	1997-11-18