EP1115266A1 - Dispositif de reproduction sonore - Google Patents

Dispositif de reproduction sonore Download PDF

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Publication number
EP1115266A1
EP1115266A1 EP00946273A EP00946273A EP1115266A1 EP 1115266 A1 EP1115266 A1 EP 1115266A1 EP 00946273 A EP00946273 A EP 00946273A EP 00946273 A EP00946273 A EP 00946273A EP 1115266 A1 EP1115266 A1 EP 1115266A1
Authority
EP
European Patent Office
Prior art keywords
microphone
signal
reproduction apparatus
sound reproduction
speaker unit
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Withdrawn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
EP00946273A
Other languages
German (de)
English (en)
Other versions
EP1115266A4 (fr
Inventor
Masahide Onishi
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 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 EP1115266A1 publication Critical patent/EP1115266A1/fr
Publication of EP1115266A4 publication Critical patent/EP1115266A4/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to a sound reproduction apparatus that provides favorable reproduced signals in an environment of relatively high ambient noise.
  • FIG. 6 is block diagram of a conventional sound reproduction apparatus.
  • signals supplied to input terminal 1 is led, through a variable gain controller 2, to a power amplifier 3 for power amplification.
  • Output signal from the power amplifier 3 is delivered to a speaker unit 4 mounted on a baffle 5 to be reproduced into sounds.
  • a microphone 6 placed at the vicinity of the speaker unit 4 collects a sum of the signals radiated from the speaker unit 4 and the noise in the neighborhood of the baffle 5.
  • Output signal from the microphone 6 is delivered, together with output signal of the power amplifier, to a subtracter 7.
  • the subtracter 7 subtracts input signal components from the sum of the signals radiated from the speaker unit 4 and the ambient noise collected by the microphone 6, in order to extract the ambient noise components.
  • Output signal of the subtracter 7, which is proportional to the ambient noise, is limited to a pass band by a low-pass filter 8.
  • An output signal of the low-pass filter 8 is rectified from AC to DC by a rectifier 9 and then delivered to the variable gain controller 2 provided at the front stage of the power amplifier 3.
  • degree of amplifying the input signals is automatically varied by the variable gain controller 2 in accordance with a degree of ambient noise around the speaker unit 4, so that signals radiated from the speaker unit 4 is not masked by the ambient noise.
  • the subtracter 7 can not totally remove the signal components radiated from the speaker unit 4, or, it is difficult to extract component of the ambient noise around the speaker unit 4. So, it is compelled to perform the control, using only a very limited pass band components of the noise.
  • the present invention aims to provide a sound reproduction apparatus that precisely removes signals radiated from a speaker unit and varies the gains in accordance with the ambient noise.
  • a sound reproduction apparatus of the present invention extracts ambient noise components using a first microphone provided outside the dust cap of a speaker unit and a second microphone provided inside the dust cap of the speaker unit. With the above described arrangement, it can extract the ambient noise around the speaker unit precisely, and performs a natural compensation to the masking.
  • FIG. 1 shows block diagram of a sound reproduction apparatus in an example of the present invention.
  • FIG. 2 is an output characteristic of a second microphone in the sound reproduction apparatus of the present invention.
  • FIG. 3 is an output characteristic of a high-pass filter in the sound reproduction apparatus of the present invention.
  • FIG. 4 is an output characteristic of a first microphone in the sound reproduction apparatus of the present invention.
  • FIG. 5 is an output characteristic of a low-pass filter in the sound reproduction apparatus of the present invention.
  • FIG. 6 shows block diagram of a conventional sound reproduction apparatus.
  • FIG. 1 shows block diagram of a sound reproduction apparatus in an example of the present invention.
  • input signal supplied to an input terminal 10 is delivered to a variable gain controller 11, or control means, which is controlled by a signal generated in accordance with an ambient noise to be described later.
  • Output of the variable gain controller 11 is delivered to a power amplifier 12, output signal of the power amplifier 12 is connected to a speaker unit 14 mounted on a baffle 13. Outside the dust cap of speaker unit 14, a first microphone 16 is provided for collecting sum of the signal radiated from speaker unit 14 and the ambient noise.
  • a second microphone 17 is provided inside the dust cap of speaker unit 14, for collecting the signal in proportion to the sound radiation from speaker unit 14.
  • An output signal of the first microphone 16 after passing through a low-pass filter 18 and an output signal of the second microphone 17 after passing through a high-pass filter 19 are input together to an adder 20. Then, components of the signal radiated from the speaker unit 14 are removed, and only the noise components around the speaker unit 14 collected by the first microphone 16 can be extracted.
  • Output of the adder 20, which being the noise components around speaker unit 14, is delivered to a rectifier 21, or conversion means, to be converted from AC signal to DC signal.
  • the variable gain controller 11 By supplying output signal of the rectifier 21 to the variable gain controller 11, the gains are automatically varied in accordance with the ambient noise around the speaker unit 14. Thus the masking is compensated in a more natural way.
  • FIG. 2 shows frequency and phase characteristics of output signal from the second microphone 17 relative to output signal of power amplifier 12.
  • frequency at a phase characteristic 0° is 70Hz.
  • a primary high-pass filter 19 of cut-off frequency 70Hz is set as a second filter for outputting a signal of certain specific pass band.
  • Frequency and phase characteristic of output signal from the second microphone 17 after passing through the high-pass filter 19 are shown in FIG. 3.
  • Frequency at the phase characteristic 0° is 95Hz.
  • FIG. 4 shows frequency and phase characteristic of output signal from the first microphone 16 in relation to the output signal of power amplifier 12.
  • a primary low-pass filter 18 is set as a first filter outputting a signal of certain specific pass band so that phase characteristic is -180° at the frequency 95Hz.
  • Frequency and phase characteristic of output signal from the first microphone 16 after passing through the primary low-pass filter 18 are shown in FIG. 5.
  • output signals from the first microphone 16 and the second microphone 17 have approximately the same band pass characteristic in the frequency and the phase characteristic, with the phase inverse to each other.
  • the first microphone 16 is provided somewhere outside the dust cap 15 in the present example, it may be attached and fixed instead on the outer surface of the dust cap 15.
  • the latter configuration which does not require any place for installing the first microphone 16 outside the speaker unit 14, reveals its advantageous in a case where a space available for installing the speaker unit 14 is limited.
  • the first microphone 16 may be provided somewhere opposing to the dust cap 15 with a certain predetermined clearance in between. In this case, signals reproduced by the speaker unit 14 and ambient noise may be collected together with a higher fidelity. Thus, the accuracy of extracting the noise components is improved for compensation of the masking.
  • the second microphone 17 is provided somewhere inside the dust cap 15 in the present example, it may be attached and fixed instead on the inner surface of the dust cap 15.
  • the latter configuration in which the place of second microphone 17 can be away from the inside of the speaker unit 14 where the temperature goes high during operation, is advantageous in that the second microphone 17 is protected from damage due to the heat.
  • the second microphone 17 may be provided opposing to the dust cap 15 with a certain predetermined clearance in between. In this case, signals reproduced by the speaker unit 14 may be collected with a higher fidelity. Thus, the accuracy of extracting the noise components is improved for compensation of the masking.
  • the first microphone 16 and the second microphone 17 have been disposed, respectively, at the outside and at the inside of the dust cap 15. These microphones may be disposed instead on the axial line of the dust cap 15 opposing face to face with the dust cap 15 in the middle.
  • the first microphone 16 collects the signals reproduced by the speaker unit 14 containing the ambient noise
  • the second microphone 17 collects the reproduced sound of the speaker unit 14 within the dust cap 15 at an improved accuracy without ill-affecting the sound quality of speaker unit 14 at all. It is advantageous in terms of the quality of reproduced sound and the accuracy of extracting the noise components. Thus, it leads to a higher accuracy in compensating the audio sound masking.
  • Output signals from the two microphones, disposed respectively at the outside and the inside of dust cap, are processed through filters for precisely extracting only the ambient noise around the speaker unit, with the signal components output from the speaker unit removed.
  • the noise signal is converted by an rectifier circuit into DC component, and supplied to a variable gain control circuit provided at the input stage for automatically varying the gains in accordance with the ambient noise around the speaker unit.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Control Of Amplification And Gain Control (AREA)
EP00946273A 1999-07-16 2000-07-12 Dispositif de reproduction sonore Withdrawn EP1115266A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP20307499A JP2001036984A (ja) 1999-07-16 1999-07-16 音響再生装置
JP20307499 1999-07-16
PCT/JP2000/004652 WO2001006809A1 (fr) 1999-07-16 2000-07-12 Dispositif de reproduction sonore

Publications (2)

Publication Number Publication Date
EP1115266A1 true EP1115266A1 (fr) 2001-07-11
EP1115266A4 EP1115266A4 (fr) 2005-12-07

Family

ID=16467929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00946273A Withdrawn EP1115266A4 (fr) 1999-07-16 2000-07-12 Dispositif de reproduction sonore

Country Status (3)

Country Link
EP (1) EP1115266A4 (fr)
JP (1) JP2001036984A (fr)
WO (1) WO2001006809A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006043250A1 (fr) * 2004-10-21 2006-04-27 Koninklijke Philips Electronics N.V. Commande de niveau audio automatique
EP1401238A4 (fr) * 2001-06-19 2007-11-28 Matsushita Electric Ind Co Ltd Systeme de reproduction du son

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5538249B2 (ja) * 2011-01-20 2014-07-02 日本電信電話株式会社 ステレオヘッドセット

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01282996A (ja) * 1988-05-10 1989-11-14 Citizen Watch Co Ltd 消音装置における検出駆動システム
EP0951201A2 (fr) * 1998-04-15 1999-10-20 Matsushita Electric Industrial Co., Ltd. Appareil de reproduction de signaux audio

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210001B1 (fr) * 1967-12-30 1977-03-19
JPS5863207A (ja) * 1981-10-13 1983-04-15 Matsushita Electric Ind Co Ltd 音響再生装置
JP3548347B2 (ja) * 1996-08-12 2004-07-28 ティーオーエー株式会社 音量自動調整装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01282996A (ja) * 1988-05-10 1989-11-14 Citizen Watch Co Ltd 消音装置における検出駆動システム
EP0951201A2 (fr) * 1998-04-15 1999-10-20 Matsushita Electric Industrial Co., Ltd. Appareil de reproduction de signaux audio

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 062 (E-0883), 5 February 1990 (1990-02-05) -& JP 01 282996 A (CITIZEN WATCH CO LTD), 14 November 1989 (1989-11-14) *
See also references of WO0106809A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1401238A4 (fr) * 2001-06-19 2007-11-28 Matsushita Electric Ind Co Ltd Systeme de reproduction du son
WO2006043250A1 (fr) * 2004-10-21 2006-04-27 Koninklijke Philips Electronics N.V. Commande de niveau audio automatique

Also Published As

Publication number Publication date
EP1115266A4 (fr) 2005-12-07
WO2001006809A1 (fr) 2001-01-25
JP2001036984A (ja) 2001-02-09

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