WO2009060557A1 - Signal amplifying device and acoustic system - Google Patents

Signal amplifying device and acoustic system Download PDF

Info

Publication number
WO2009060557A1
WO2009060557A1 PCT/JP2008/002576 JP2008002576W WO2009060557A1 WO 2009060557 A1 WO2009060557 A1 WO 2009060557A1 JP 2008002576 W JP2008002576 W JP 2008002576W WO 2009060557 A1 WO2009060557 A1 WO 2009060557A1
Authority
WO
WIPO (PCT)
Prior art keywords
amplifying device
signal amplifying
piezoelectric speaker
output
supplies
Prior art date
Application number
PCT/JP2008/002576
Other languages
French (fr)
Japanese (ja)
Inventor
Yusuke Okumoto
Makoto Yamamoto
Junko Hirose
Toshinobu Nagasawa
Takayuki Nakai
Original Assignee
Panasonic Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corporation filed Critical Panasonic Corporation
Publication of WO2009060557A1 publication Critical patent/WO2009060557A1/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low frequency amplifiers, e.g. audio preamplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/165—A filter circuit coupled to the input of an amplifier

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

In a signal amplifying device (10), a filter circuit (13) cuts off, among the high-frequency components included in an input signal, frequency components in a frequency band in which the output sound pressure level of a piezoelectric speaker (20) connected to the signal amplifying device (10) becomes below a predetermined value. An amplifier circuit (12) amplifies the output of the filter circuit (13) and supplies the amplified output to the piezoelectric speaker (20). A switching power supply circuit (11) boosts an externally supplied voltage up to a voltage necessary for driving the piezoelectric speaker (20) and supplies the boosted voltage to the amplifier circuit (12).
PCT/JP2008/002576 2007-11-07 2008-09-18 Signal amplifying device and acoustic system WO2009060557A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007289953A JP2009118260A (en) 2007-11-07 2007-11-07 Signal amplifying device, and acoustic system
JP2007-289953 2007-11-07

Publications (1)

Publication Number Publication Date
WO2009060557A1 true WO2009060557A1 (en) 2009-05-14

Family

ID=40625468

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/002576 WO2009060557A1 (en) 2007-11-07 2008-09-18 Signal amplifying device and acoustic system

Country Status (2)

Country Link
JP (1) JP2009118260A (en)
WO (1) WO2009060557A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5711041B2 (en) * 2011-05-09 2015-04-30 新日本無線株式会社 Capacitive speaker drive circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59146296A (en) * 1983-02-08 1984-08-22 Murata Mfg Co Ltd Driving method of piezoelectric speaker
JP2003234621A (en) * 2002-02-12 2003-08-22 Alpine Electronics Inc Audio device
JP2005109665A (en) * 2003-09-29 2005-04-21 Matsushita Electric Ind Co Ltd Load driver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59146296A (en) * 1983-02-08 1984-08-22 Murata Mfg Co Ltd Driving method of piezoelectric speaker
JP2003234621A (en) * 2002-02-12 2003-08-22 Alpine Electronics Inc Audio device
JP2005109665A (en) * 2003-09-29 2005-04-21 Matsushita Electric Ind Co Ltd Load driver

Also Published As

Publication number Publication date
JP2009118260A (en) 2009-05-28

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