WO2002013573A1 - Dispositif a haut-parleur - Google Patents

Dispositif a haut-parleur Download PDF

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Publication number
WO2002013573A1
WO2002013573A1 PCT/JP2000/005271 JP0005271W WO0213573A1 WO 2002013573 A1 WO2002013573 A1 WO 2002013573A1 JP 0005271 W JP0005271 W JP 0005271W WO 0213573 A1 WO0213573 A1 WO 0213573A1
Authority
WO
WIPO (PCT)
Prior art keywords
microphone
output signal
sound
amplifier
speaker unit
Prior art date
Application number
PCT/JP2000/005271
Other languages
English (en)
Japanese (ja)
Inventor
Hidekazu Tanaka
Fumiyasu Konno
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
Priority to JP13819199A priority Critical patent/JP4224892B2/ja
Priority claimed from JP13819199A external-priority patent/JP4224892B2/ja
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to US10/089,884 priority patent/US7136495B1/en
Priority to PCT/JP2000/005271 priority patent/WO2002013573A1/fr
Priority to CZ20021168A priority patent/CZ299745B6/cs
Priority to EP00950015A priority patent/EP1221824B1/fr
Priority to CNB008138494A priority patent/CN1186965C/zh
Priority to DE60031558T priority patent/DE60031558T2/de
Publication of WO2002013573A1 publication Critical patent/WO2002013573A1/fr
Priority to HK03101884.4A priority patent/HK1049940B/zh

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

Definitions

  • the present invention relates to a speaker device used for various audio equipment and a television receiver.
  • a sound tube is connected to the front of the speaker unit, and a microphone for detecting the sound reproduced from the speed unit is provided in the sound tube.
  • the sound reproduced from the speaker unit is corrected by the detection signal. It relates to a speaker device.
  • Fig. 7 is a block diagram
  • Fig. 8 (A) is the microphone output signal diagram
  • Fig. 8 (B) is the acoustic output characteristic diagram
  • a is the sound pressure characteristic
  • b is The phase characteristic is shown.
  • reference numeral 1 denotes a speaker unit for generating a sound wave, and the speaker unit 1 is connected to an acoustic tube 2. Sound absorbing materials (not shown) are arranged on both sides of the acoustic tube 2 to suppress resonance. Inside the acoustic tube 2, a microphone 4 for detecting an acoustic output signal is arranged near the speaker unit 1.
  • a sound output is emitted from the speaker unit 1, and the sound output passes through the sound tube 2 and radiates from the opening of the sound tube 2. Is done.
  • a standing wave generated by the length of the acoustic tube 2 inside the acoustic tube 2 or a standing wave generated inside the speaker tube 2 causes This standing wave is suppressed by a sound absorbing material in order to prevent the reproduction sound pressure frequency characteristic having a sharp peak dip from being produced, but the sound wave is a standing wave that is insufficient and cannot be suppressed.
  • the output is detected by the microphone 4 and fed back to the subtractor 6 via the microphone amplifier 5 to suppress the standing wave generated in the acoustic tube 2 and realize a flat reproduced sound pressure frequency characteristic.
  • feedback control is performed from the low-frequency component to the high-frequency component, it is not possible to control only an arbitrary frequency component.
  • V o u t / V i n A (1 + AT (S))
  • T (S) is almost the transfer function of speaker unit 1 because the characteristics of microphone 4 are almost flat
  • the secondary or tertiary tube of speaker unit 1 and acoustic tube 2 T (S) becomes minus 1 due to the phase change due to resonance.
  • the denominator becomes 0 and the condition for oscillation occurs. From this, Considering the oscillation margin, large feedback could not be achieved, and it was difficult to control efficiently from low frequencies to tube resonance.
  • An object of the present invention is to solve the above-mentioned problems, and to provide a speaker device that can exhibit stable characteristics. Disclosure of the invention
  • a speaker device includes a power amplifier to which an input signal is input via a subtractor, a speed unit for reproducing an output signal of the power amplifier, and a sound wave of the speaker unit.
  • An acoustic tube coupled to the front surface for guiding the sound, a microphone for detecting the acoustic output radiated from the speaker unit, a microphone amplifier for amplifying the acoustic output signal detected by the microphone, and an output signal of the microphone amplifier Is connected to a subtractor, and the output signal of the microphone amplifier is connected to the subtractor via a high-pass filter to form a negative feedback circuit to suppress the peak dip of the sound pressure frequency characteristic, thereby making the speaker device As a result, stable characteristics can be obtained.
  • FIG. 1 is a block diagram of an embodiment of the splicing device of the present invention
  • FIG. 2 is a diagram of the sound output characteristic
  • FIG. 3 is a block diagram of the other embodiment
  • FIG. Figure (A) is a microphone output signal characteristic diagram
  • Figure 4 (B) is an acoustic output characteristic diagram
  • Figure 5 is a block diagram of another embodiment
  • Figure 6 (A) Fig. 6 (B) is the same sound output characteristic diagram
  • Fig. 7 is a block diagram
  • Fig. 8 (A) is the same microphone output signal diagram
  • FIG. 8 (B) is the same sound output characteristic diagram.
  • FIG. 1 is a block diagram of an acoustic circuit according to the first embodiment
  • FIG. 2 is an acoustic output characteristic diagram, wherein a shows a sound pressure characteristic and b shows a phase characteristic.
  • 1 is a speaker unit
  • 2 is an acoustic tube coupled to the front of the speaker unit
  • 4 is a microphone mounted in the acoustic tube 2, and radiated from the speaker unit 1.
  • the sound wave is detected by the microphone 4 in the acoustic tube 2 and is input to the subtractor 6 through the high-pass filter 7, and the signal detected by the microphone 4 is directly input to the subtractor 6.
  • the configuration is such that the input signal is corrected by mixing with an external input signal, amplified by the power amplifier 13 and input to the speaker unit 1.
  • the relationship between the speaker unit 1 and the sound tube 2 is as follows.
  • the sound tube 2 for guiding sound waves is connected to the front of a speaker unit 1 attached to a speaker box (not shown).
  • the tube resonance generated in the acoustic tube 2 is detected by the microphone 4, and the detected sound output signal is a second-order high-pass ( ⁇ 1 2 dB / oct) pass filter.
  • the signal is returned to the subtractor 6 via 7 and the signal detected by the microphone 4 is directly fed back to the subtractor 6.
  • FIG. 2 shows the sound output characteristics of the present embodiment. Compared to the conventional technique of FIG. 8 (B), a peak due to a shift appears due to a phase change of the resonance component. Not in. In the embodiment of FIG. 2, the frequency characteristics are flattened without any shift of the resonance component.
  • the tube resonance generated in the sound tube 2 is detected by the microphone 4, and the detected sound output signal is fed back to the subtractor 6 through the second-order (12 dB / oct) high-pass filter 7.
  • the signal detected by the microphone 4 is directly fed back to the subtractor 6, and the cut-off frequency of the second-order (-12 dB Zoct) high-pass filter 7 is adjusted to the frequency of the tube resonance. It is possible to provide an excellent spinning device by performing phase correction.
  • FIG. 3 is a block diagram of an acoustic circuit according to another embodiment of the present invention.
  • FIG. 4 (A) is a microphone output signal characteristic diagram
  • FIG. 4 (B) is an acoustic output characteristic diagram, Sound pressure characteristic
  • b shows phase characteristic.
  • the acoustic output signal detected by the microphone 4 is connected to the subtractor 6 via two high-pass filters 7 and 8 connected in parallel to form a negative feedback circuit.
  • 7 is a second-order (one 12 dBZo ct) high-pass filter
  • 8 is a first-order (6 dBZo ct) high-pass filter.
  • the frequency characteristics of the conventional microphone signal shown in FIG. 8 (A) even the low-frequency components are returned, and the low-frequency components are enhanced.
  • the level of the low frequency component is reduced, and the low frequency component is not enhanced.
  • the conventional technology shows a low frequency response. Although the characteristics are enhanced, it can be seen that the low-frequency characteristics are not enhanced in this example.
  • the acoustic output signal detected by the microphone 4 is used to connect the output signal of the microphone amplifier 5 to two parallel-connected primary and secondary high-pass filters 8 and 7, and the output signal Is connected to the subtractor 6 to form a negative feedback circuit, so that the microphone output signal only in the vicinity of the resonance frequency component can be fed back, the enhancement of low frequency components can be suppressed, and the output frequency characteristic is flat. It is possible to provide a speaker device having excellent acoustic characteristics capable of realizing and correcting.
  • FIG. 5 is a block diagram of an acoustic circuit according to another embodiment of the present invention.
  • FIG. 6 (A) is a microphone output signal characteristic diagram
  • FIG. 6 (B) is the same acoustic output characteristic diagram, Sound pressure characteristic
  • b shows phase characteristic.
  • a second-order high-pass filter 7 that processes the output signal detected by the microphone 4 is connected, the output signal is connected to the subtractor 6, and the output signal of the microphone 4 is
  • the negative feedback circuit is constructed by connecting the low pass filter 9 of 1 2 d BZ oct or-6 d BZ oct to be processed to the subtractor 6.
  • the low-pass filter 9 extracts only low-frequency components and performs phase correction to correct output acoustic characteristics using only low-frequency components, and the second-order high-pass filter 7 also independently corrects tube resonance. Thus, it is possible to arbitrarily control the output frequency characteristics, and to provide a speaker device having excellent acoustic characteristics that can easily and easily realize the flattening and correction of the output frequency characteristics.
  • the high-pass filter is controlled by the secondary tube resonance.
  • control is of order n (n is a positive integer)
  • control of the tube resonance can be realized, and the present invention can be applied to the present invention.
  • the present invention is applicable even when the back cover connected to the acoustic tube is a bass reflex or when there is no back force cover.
  • a speaker device of the present invention is coupled to a power amplifier to which an input signal is input via a subtractor, a speaker unit for reproducing an output signal of the power amplifier, and a front surface for guiding sound waves of the speed unit.
  • Sound tube a microphone for detecting the sound output radiated from the speaker unit, a microphone amplifier for amplifying the sound output signal detected by the microphone, and an output signal of the microphone amplifier connected to a subtractor.
  • the microphone output signal of the microphone amplifier is connected to the subtractor through a high-pass filter to form a negative feedback circuit
  • the microphone output signal is fed back through the high-pass filter and The phase is corrected by directly feeding back the microphone output signal.
  • direct feedback of the microphone output signal makes it possible to enhance low-frequency components, flattening output frequency characteristics and improving bass reproduction.
  • a speaker device having acoustic characteristics can be provided.
  • the high-pass filter is a secondary high-pass filter
  • a greater effect can be obtained by adjusting the cut-off frequency to the supplied frequency.
  • the output signal of the amplifier is connected to the above-described subtractor via primary and secondary high-pass filters connected in parallel to form the negative feedback circuit, a microphone only near the resonance frequency component is used.
  • the output signal can be fed back, the enhancement of low frequency components can be suppressed, and the output frequency characteristics can be flattened and corrected, and a speaker device with excellent acoustic characteristics can be provided.
  • a negative feedback circuit is constructed by connecting to the above subtractor via a primary or secondary low-pass filter, the microphone output signal near the low-frequency component and the resonance frequency component is fed back.
  • the low-pass filter enables low-frequency component phase correction, low-frequency component control, and independent frequency component control. This makes it possible to control the resonance frequency component while enhancing and suppressing bass reproduction, flattening and correcting output frequency characteristics can be arbitrarily and easily realized, and achieve excellent sound characteristics.
  • a speaker device can be provided.

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

Abstract

L'invention concerne un dispositif à haut-parleur comprenant un soustracteur (6), un amplificateur de puissance (13) dans lequel on injecte un signal d'entrée via le soustracteur (6), une unité de haut-parleur (1) pour la reproduction du signal de sortie à partir de l'amplificateur (13), un tube de guidage acoustique (2) couplé à l'avant de l'unité de haut-parleur (1) pour guider l'onde sonore depuis ladite unité (1), et un circuit de contre-réaction comprenant un microphone (4) de détection des signaux sonores qui émanent de cette unité (1), un amplificateur de microphone (5) pour l'amplification des signaux sonores détectés par le microphone (4) et l'injection de ces signaux directement dans le soustracteur (6), et enfin un filtre passe-haut (7) à travers lequel les signaux émanant de l'amplificateur de microphone (5) sont également injectés dans le soustracteur (6), ce qui permet de supprimer le creux de dépression de la caractéristique de fréquence de pression acoustique pour aplatir la caractéristique acoustique.
PCT/JP2000/005271 1999-05-19 2000-08-07 Dispositif a haut-parleur WO2002013573A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP13819199A JP4224892B2 (ja) 1999-05-19 1999-05-19 スピーカ装置
US10/089,884 US7136495B1 (en) 1999-05-19 2000-08-07 Loudspeaker device
PCT/JP2000/005271 WO2002013573A1 (fr) 1999-05-19 2000-08-07 Dispositif a haut-parleur
CZ20021168A CZ299745B6 (cs) 2000-08-07 2000-08-07 Reproduktorové zarízení
EP00950015A EP1221824B1 (fr) 2000-08-07 2000-08-07 Dispositif a haut-parleur
CNB008138494A CN1186965C (zh) 2000-08-07 2000-08-07 扬声器装置
DE60031558T DE60031558T2 (de) 2000-08-07 2000-08-07 Lautsprechervorrichtung
HK03101884.4A HK1049940B (zh) 2000-08-07 2003-03-14 揚聲器裝置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP13819199A JP4224892B2 (ja) 1999-05-19 1999-05-19 スピーカ装置
PCT/JP2000/005271 WO2002013573A1 (fr) 1999-05-19 2000-08-07 Dispositif a haut-parleur

Publications (1)

Publication Number Publication Date
WO2002013573A1 true WO2002013573A1 (fr) 2002-02-14

Family

ID=11736331

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/005271 WO2002013573A1 (fr) 1999-05-19 2000-08-07 Dispositif a haut-parleur

Country Status (6)

Country Link
EP (1) EP1221824B1 (fr)
CN (1) CN1186965C (fr)
CZ (1) CZ299745B6 (fr)
DE (1) DE60031558T2 (fr)
HK (1) HK1049940B (fr)
WO (1) WO2002013573A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1351543A2 (fr) * 2002-03-07 2003-10-08 Pioneer Corporation Appareil de contrôle pour haut-parleur et système de haut-parleur

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100566140C (zh) * 2003-10-14 2009-12-02 音频专用集成电路公司 麦克风前置放大器
US8243939B2 (en) * 2008-12-30 2012-08-14 Gn Resound A/S Hearing instrument with improved initialisation of parameters of digital feedback suppression circuitry
CN102384821B (zh) * 2011-08-10 2015-07-29 歌尔声学股份有限公司 扬声器模组气密性测试方法、测试工装以及测试***

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798374A (en) * 1972-04-03 1974-03-19 Rene Oliveras Sound reproducing system utilizing motional feedback
JPH07162990A (ja) * 1993-12-09 1995-06-23 Matsushita Electric Ind Co Ltd 音響再生装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5990491A (ja) * 1982-11-15 1984-05-24 Matsushita Electric Ind Co Ltd オ−デイオ装置
DE4021787A1 (de) * 1990-07-09 1992-01-16 Telefunken Electronic Gmbh Elektro-akustisches system
JP3521626B2 (ja) * 1996-07-16 2004-04-19 松下電器産業株式会社 音響再生装置
JP3893730B2 (ja) * 1998-04-15 2007-03-14 松下電器産業株式会社 音響再生装置
CN100534222C (zh) * 1998-12-01 2009-08-26 松下电器产业株式会社 扬声器装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798374A (en) * 1972-04-03 1974-03-19 Rene Oliveras Sound reproducing system utilizing motional feedback
JPH07162990A (ja) * 1993-12-09 1995-06-23 Matsushita Electric Ind Co Ltd 音響再生装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1221824A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1351543A2 (fr) * 2002-03-07 2003-10-08 Pioneer Corporation Appareil de contrôle pour haut-parleur et système de haut-parleur
EP1351543A3 (fr) * 2002-03-07 2007-04-04 Pioneer Corporation Appareil de contrôle pour haut-parleur et système de haut-parleur

Also Published As

Publication number Publication date
CZ299745B6 (cs) 2008-11-12
HK1049940A1 (en) 2003-05-30
CZ20021168A3 (cs) 2003-02-12
EP1221824A4 (fr) 2005-12-07
CN1186965C (zh) 2005-01-26
HK1049940B (zh) 2005-06-10
DE60031558D1 (de) 2006-12-07
CN1377566A (zh) 2002-10-30
EP1221824B1 (fr) 2006-10-25
EP1221824A1 (fr) 2002-07-10
DE60031558T2 (de) 2007-06-06

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