EP0658064A3 - Acoustic reproducing apparatus - Google Patents

Acoustic reproducing apparatus Download PDF

Info

Publication number
EP0658064A3
EP0658064A3 EP94119350A EP94119350A EP0658064A3 EP 0658064 A3 EP0658064 A3 EP 0658064A3 EP 94119350 A EP94119350 A EP 94119350A EP 94119350 A EP94119350 A EP 94119350A EP 0658064 A3 EP0658064 A3 EP 0658064A3
Authority
EP
European Patent Office
Prior art keywords
speaker
output signal
subtractor
microphone
acoustic
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP94119350A
Other languages
German (de)
French (fr)
Other versions
EP0658064A2 (en
Inventor
Fumiyasu Konno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0658064A2 publication Critical patent/EP0658064A2/en
Publication of EP0658064A3 publication Critical patent/EP0658064A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The invention presents means for applying negative feedback more powerfully and stably than before over a frequency range as wide as possible, in the constitution for detecting a reproduced sound of a speaker used in various acoustic appliances by a microphone, and applying a negative feedback to an input signal of the speaker by the detected signal, and correcting the reproduced signal by improving the reproduction frequency characteristic and other characteristic of the speaker.
A fundamental constitution of an acoustic reproducing apparatus of the invention comprises a subtractor having an input terminal, a power amplifier for amplifying the output signal of this subtractor, a speaker for reproducing the output signal of the power amplifier, a microphone for detecting the acoustic output signal radiated from the speaker, a microphone amplifier for amplifying the acoustic output signal detected by the microphone, and an adder/subtractor for adding or subtracting the output signal of the microphone amplifier and the input signal of the power amplifier, wherein the output signal of the adder/subtractor is connected to the subtractor to compose a negative feedback circuit.
Or, in an acoustic reproducing circuit using a speaker box incorporating a passive radiator, a microphone is disposed in the front side of the magnetic circuit of the speaker for reproducing the output signal of the power amplifier or speaker rear enclosed acoustic space, or in the enclosed acoustic space with the passive radiator of the speaker front side, and the output signal of the microphone is added or subtracted with the input signal of the power amplifier in the adder/subtractor in the fundamental constitution above, and the signal is subtracted from the input signal in the subtractor, thereby composing a negative feedback circuit.
EP94119350A 1993-12-09 1994-12-07 Acoustic reproducing apparatus Withdrawn EP0658064A3 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP309015/93 1993-12-09
JP30901593 1993-12-09
JP30901593 1993-12-09

Publications (2)

Publication Number Publication Date
EP0658064A2 EP0658064A2 (en) 1995-06-14
EP0658064A3 true EP0658064A3 (en) 2004-09-01

Family

ID=17987859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94119350A Withdrawn EP0658064A3 (en) 1993-12-09 1994-12-07 Acoustic reproducing apparatus

Country Status (1)

Country Link
EP (1) EP0658064A3 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2292854B (en) * 1994-08-12 1999-08-25 Motorola Ltd Electronic audio device and method of operation
US6243472B1 (en) * 1997-09-17 2001-06-05 Frank Albert Bilan Fully integrated amplified loudspeaker
DE19746645C1 (en) * 1997-10-22 1999-05-20 Fraunhofer Ges Forschung Adaptive acoustic monitor
CN100534222C (en) * 1998-12-01 2009-08-26 松下电器产业株式会社 Speaker device
JP2001157293A (en) * 1999-12-01 2001-06-08 Matsushita Electric Ind Co Ltd Speaker system
DE102005016204A1 (en) * 2005-04-07 2006-10-12 Sennheiser Electronic Gmbh & Co. Kg Headphone for connection to an external active noise compensation device
US9743181B2 (en) 2016-01-06 2017-08-22 Apple Inc. Loudspeaker equalizer
US9961464B2 (en) 2016-09-23 2018-05-01 Apple Inc. Pressure gradient microphone for measuring an acoustic characteristic of a loudspeaker
US10299039B2 (en) 2017-06-02 2019-05-21 Apple Inc. Audio adaptation to room
US10425733B1 (en) 2018-09-28 2019-09-24 Apple Inc. Microphone equalization for room acoustics

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147166A (en) * 1983-09-26 1985-05-01 Graham Potter Apparatus and method for providing an undistorted output signal from a non-linear device
JPS60263598A (en) * 1984-06-11 1985-12-27 Matsushita Electric Ind Co Ltd Howling suppressing device
GB2211685A (en) * 1987-10-28 1989-07-05 Ian Grenville Thomas Differential volume adjusters
JPH02230897A (en) * 1989-03-03 1990-09-13 Nippon Telegr & Teleph Corp <Ntt> Sound pressure controller
JPH04302300A (en) * 1991-03-29 1992-10-26 Aiwa Co Ltd Driving device for bass reflecting type loudspeaker

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147166A (en) * 1983-09-26 1985-05-01 Graham Potter Apparatus and method for providing an undistorted output signal from a non-linear device
JPS60263598A (en) * 1984-06-11 1985-12-27 Matsushita Electric Ind Co Ltd Howling suppressing device
GB2211685A (en) * 1987-10-28 1989-07-05 Ian Grenville Thomas Differential volume adjusters
JPH02230897A (en) * 1989-03-03 1990-09-13 Nippon Telegr & Teleph Corp <Ntt> Sound pressure controller
JPH04302300A (en) * 1991-03-29 1992-10-26 Aiwa Co Ltd Driving device for bass reflecting type loudspeaker

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 133 (E - 404) 17 May 1986 (1986-05-17) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 541 (E - 1007) 29 November 1990 (1990-11-29) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 128 (E - 1333) 18 March 1993 (1993-03-18) *

Also Published As

Publication number Publication date
EP0658064A2 (en) 1995-06-14

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