WO2003013189A1 - Appareil de reproduction acoustique - Google Patents

Appareil de reproduction acoustique Download PDF

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Publication number
WO2003013189A1
WO2003013189A1 PCT/JP2002/007425 JP0207425W WO03013189A1 WO 2003013189 A1 WO2003013189 A1 WO 2003013189A1 JP 0207425 W JP0207425 W JP 0207425W WO 03013189 A1 WO03013189 A1 WO 03013189A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound
phase
phase shifter
output signal
power amplifiers
Prior art date
Application number
PCT/JP2002/007425
Other languages
English (en)
Japanese (ja)
Inventor
Masahide Onishi
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
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2003013189A1 publication Critical patent/WO2003013189A1/fr

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
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3044—Phase shift, e.g. complex envelope processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Definitions

  • the present invention provides, for example, a sound reproduction device used as a sound muffler that reproduces sound with good sound quality and satisfactorily reduces noise in a vehicle interior.
  • an on-vehicle sound reproducing device as shown in FIG. 12 is known.
  • a signal source 101 for supplying music signals and the like, a first power amplifier 103, and a second power amplifier 104 are connected to a signal source 101, respectively.
  • the output of the first power amplifier 103 is connected to a speed force 5 attached to the left door of the vehicle 107.
  • a speaker 106 attached to the right door of the vehicle 107 is connected to the output of the second power amplifier 104. In this way, the user can enjoy playing music and the like in the cabin.
  • the acoustic space is narrow and the listener is located at a position deviated from the center position of the two opposing speech forces 105 and 106. For this reason, the sound pressure and phase characteristics of the sound reaching the listener's ear vary greatly as the frequency increases.
  • Figures 13 and 14 show the data measured by the dummy head in the actual vehicle interior.
  • Fig. 13 and Fig. 14 show the phase difference and sound pressure difference of the sounds entering the left and right ears, respectively.
  • the sounds entering the left and right ears of the listener near 250 Hz are in opposite phases as shown in FIG.
  • the wavelength of the 250 Hz signal is 1.36 m. This is almost the same as the distance from the left door to the right door in the cabin.
  • the listener sits off the center of the two speeds 105 and 106.
  • the right and left speakers transmit sounds whose phases differ by approximately 180 degrees to the listener. .
  • the phenomenon described above occurs.
  • the sense of opposite phase of the sound is strongly detected. That is, at the position of the recipient, relative to the left and right ears of the listener, the phases of the sounds entering the left and right ears are reversed, as shown in Fig. 14.
  • the sound pressure level also fluctuates greatly.
  • the balance between the sounds entering the left and right ears at the position of the religious person is poor.
  • a noise having a phase opposite to that of noise for canceling noise is generated at the listener's position. At this time, if the sounds having opposite phases reach the right and left ears of the listener as described above, the sound deadening performance cannot be obtained.
  • An object of the present invention is to provide a sound reproducing device having good sound quality. At least two power amplifiers amplify the output signal of the source. At least two speakers reproduce sound using the output power of the two power amplifiers. An nth-order phase shifter is coupled to at least one of the two power amplifiers to change the phase of the output signal of the signal source.
  • the sound reproducing device of the present invention controls the phases of the sound waves generated from the left and right speakers, and reproduces good sound.
  • FIG. 1 is a system diagram for describing Embodiment 1 of the sound reproduction device of the present invention.
  • FIG. 2 is a circuit diagram for explaining the phase shifter according to the first embodiment.
  • FIG. 3 illustrates characteristics of the phase shifter according to the first embodiment.
  • FIG. 4 illustrates the phase characteristics of the system according to the first embodiment.
  • FIG. 5 illustrates the sound pressure characteristics of the system according to the first embodiment.
  • FIG. 6 is a system diagram for describing Embodiment 2 of the sound reproduction device of the present invention.
  • FIGS. 7A and 7B are circuit diagrams for explaining the phase shifter according to the second embodiment.
  • FIG. 8 illustrates the phase characteristics of the phase shifter according to the second embodiment.
  • FIG. 9 is a characteristic diagram for explaining a relative phase difference of the phase shifter according to the second embodiment.
  • FIG. 10 is a system diagram for describing Embodiment 3 of the sound reproduction device of the present invention.
  • FIG. 11 is a system diagram for describing Embodiment 4 of the sound reproducing device of the present invention.
  • FIG. 12 is a diagram for explaining a conventional sound reproducing device.
  • Figure 13 illustrates the phase characteristics of the conventional system
  • FIG. 14 illustrates the sound pressure characteristics of a conventional system.
  • FIG. 1 is a system diagram for explaining Embodiment 1 of the sound reproducing device of the present invention.
  • FIG. 2 is a circuit diagram showing a phase shifter according to the present embodiment.
  • FIG. 3 is a characteristic diagram showing frequency vs. gain and phase characteristics of the phase shifter according to the present embodiment.
  • a signal source 1 for supplying a music signal or the like is coupled to a first power amplifier 3 through an n-order phase shifter 2. Further, the signal source 1 is coupled to the second power amplifier 4. The speed 5 mounted on the door of the vehicle 7 is driven by the first power amplifier 3. Another speed force 6 attached to the door of the vehicle 7 is driven by the second power amplifier 4.
  • the signal source 1 and the two-channel power amplifier and the speeds 5 and 6 form a sound reproduction system.
  • the n-order phase shifter is configured by combining, for example, n phase delay circuits of approximately 180 degrees.
  • n is an integer. Therefore, the first-order phase shifter is composed of, for example, a delay circuit that keeps the gain constant and delays the signal phase by approximately 180 degrees as the frequency increases.
  • the phase shifter 2 used in the present embodiment is a fourth-order phase shifter. In other words, it is a 4 x approximately 180 degree delay circuit. As shown in the circuit diagram of FIG. 2, these are the capacitors 8, 11, 14, 17, the resistors 9, 10, 10, 12, 13, 15, 15, 16, 18, 19, and 2 It consists of two operational amplifiers 20 and 21. In the frequency vs. gain and phase characteristics of the phase shifter 2, the gain is constant as shown in FIG. 3, and the phase is delayed as the frequency increases.
  • phase shifter of FIG. 2 two second-order phase shifters are connected in series.
  • the gain is constant and the phase changes by 360 degrees for the frequency of the signal passing through one second-order phase shifter.
  • the frequency ranges of the two second-order phase shifters are selected so that the curve of the phase change with respect to the frequency is continuous.
  • the phase of the sound reaching the left and right ears of the listener is inverted around 260 Hz.
  • the above-described fourth-order phase shifter 2 is provided before the first power amplifier 3.
  • the phase change width up to around 400 Hz is improved to within ⁇ 90 °.
  • the sound pressure difference between the sounds coming from the left and right of the listener is also improved to within ⁇ 10 dB.
  • a fourth-order phase shifter is used.
  • an n-order phase shifter may be used. Even in the nth-order phase shifter, the sounds reaching the left and right ears of the listener are near frequencies that are out of phase with each other, and the phase of one sound is further shifted by approximately 180 degrees. Its characteristic force S is set. At this time, similarly to the above, the phase difference and sound pressure difference of the sound reaching the right and left ears of the listener from the left and right can be improved.
  • the sound level reaching the left and right ears of the listener depends on the width of the cabin.
  • the frequency at which the phases are reversed changes. Therefore, the frequency band of the phase shifter may be adjusted according to the width of the cabin.
  • FIG. 6 is a system diagram for explaining Embodiment 2 of the sound reproducing device of the present invention.
  • FIG. 7 is a circuit diagram showing a phase shifter according to the present embodiment. 6 and 7, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, detailed description thereof will be omitted, and only different portions will be described.
  • FIG. 8 is a characteristic diagram showing the phase characteristics of the two phase shifters in FIG.
  • FIG. 9 is a characteristic diagram showing a relative phase of two phase shifter outputs when the phase shifter shown in FIG. 8 is configured.
  • an n-order phase shifter 22 is provided before the first power amplifier 3.
  • An n-order phase shifter 22 is provided before the second power amplifier 4.
  • This circuit configuration is constructed by connecting the basic configuration of the secondary phase shifter shown in Figs. As shown by characteristic curves A and B in FIG. 8, the two phase shifters 2 and 22 have different phase rotation center frequencies, respectively.
  • the relative phase difference between the sounds emitted from the two channels can be 180 degrees at a certain frequency.
  • the sounds coming out of the two channels will be out of phase with each other at their frequency.
  • the sounds from the two channels are Reverse phase to become part of the frequency can be set in the vicinity of 2 5 0 H Z.
  • the frequency portion having the opposite phase is around 250 Hz.
  • the relative phase of the sound waves radiated from the left and right loudspeakers is further opposite in a frequency portion where the relative phases are opposite to each other. As a result, phase correction can be realized.
  • FIG. 10 is a system diagram for describing Embodiment 3 of the sound reproducing device of the present invention.
  • the same components as those in Fig. 1 are assigned the same numbers, detailed description is omitted, and only different components are described.
  • the microphone 24 detects noise.
  • the filter 23 is adjusted so that the output signal of the microphone 24 has the opposite phase to the noise source and is output.
  • the output signal of the filter 23 is distributed to two channels.
  • the two power amplifiers 3 and 4 amplify the distributed two-channel signal.
  • the loudspeakers 5 and 6 generate noise reduction to reduce noise by the output power of the power amplifiers 3 and 4.
  • this sound reproducing device has a sound deadening function.
  • an n-order phase shifter 2 is provided in a stage preceding the first power amplifier 3.
  • the sound reproducing device has a small phase difference between the left and right ears of the listener. Reaches the sound-absorbing sound and shows an excellent sound-absorbing effect. This is based on the same operating principle as that of the sound reproducing device of the first embodiment transmitting sound with a small phase difference to the left and right ears of the listener.
  • the sound reproducing device having the sound deadening function may be used in combination with the sound reproducing device described in Embodiment 1 as shown in FIG. In this case, there is provided a sound reproducing apparatus that silences noise while transmitting sound with a small phase difference to the left and right ears of the listener.
  • FIG. 11 is a system diagram for explaining Embodiment 4 of the sound reproducing device of the present invention.
  • n-order phase shifter 2 is provided before the first power amplifier 3, and an n-order phase shifter 22 is provided before the second power amplifier 4.
  • the phase rotation center frequencies of the phase shifters 2 and 22 are set to different frequencies.
  • the sound reproducing device can obtain an excellent sound deadening effect by the arrival of the sound deadening sound having a small phase difference. This is based on the same operating principle as that of the sound reproducing device according to the second embodiment transmitting sound with a small phase difference to the left and right ears of the listener.
  • the sound reproducing device having the sound deadening function may be used in combination with the sound reproducing device described in the second embodiment as shown in FIG. In this case, there is provided a sound reproducing apparatus that silences noise while transmitting sound with a small phase difference to the left and right ears of the listener.
  • At least a two-channel power amplifier is used. It amplifies the output voltage of a signal source that supplies music and the like. At least two loudspeakers reproduce sound using the output power of the two-channel power amplifier.
  • an n-order phase shifter is coupled to at least one of the two-channel power amplifiers. This makes it possible to obtain an extremely good sound reproducing device in the vehicle interior, which is less affected by the sound pressure difference between the opposite phase sound and the sound coming from the left and right.
  • the present invention provides a sound reproducing device having excellent sound deadening performance that operates well in a vehicle interior.

Abstract

La présente invention concerne un appareil de reproduction acoustique qui commande la phase des ondes acoustiques émises par une enceinte acoustique droite et par une enceinte acoustique gauche, produisant de la sorte une acoustique préférentielle. Au moins deux amplificateurs de puissance amplifient un signal de sortie en provenance d'une source de signaux. Au moins deux enceintes acoustiques reproduisent le son au moyen des signaux de sortie en provenance des deux amplificateurs de puissance. Un compensateur de phase d'ordre n est couplé à au moins l'un des deux amplificateurs de puissance et modifie la phase du signal de sortie en provenance de la source de signaux.
PCT/JP2002/007425 2001-07-31 2002-07-23 Appareil de reproduction acoustique WO2003013189A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001231447A JP2003047097A (ja) 2001-07-31 2001-07-31 音響再生装置
JP2001-231447 2001-07-31

Publications (1)

Publication Number Publication Date
WO2003013189A1 true WO2003013189A1 (fr) 2003-02-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/007425 WO2003013189A1 (fr) 2001-07-31 2002-07-23 Appareil de reproduction acoustique

Country Status (2)

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JP (1) JP2003047097A (fr)
WO (1) WO2003013189A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2417870A (en) * 2004-09-02 2006-03-08 John David Michael Rogers Correcting back to front errors of the right channel which otherwise tend to mask other phase errors

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4892854B2 (ja) 2005-04-14 2012-03-07 パナソニック株式会社 音響再生装置と、この音響再生装置を用いた自動車
JP2006295781A (ja) 2005-04-14 2006-10-26 Matsushita Electric Ind Co Ltd 音響再生システムと、この音響再生システムを用いた自動車
JP2007208679A (ja) 2006-02-02 2007-08-16 Matsushita Electric Ind Co Ltd 音響再生装置
JP4894342B2 (ja) 2006-04-20 2012-03-14 パナソニック株式会社 音響再生装置
JP4322916B2 (ja) 2006-12-26 2009-09-02 本田技研工業株式会社 能動型振動騒音制御装置
FR2918532B1 (fr) * 2007-07-05 2015-04-24 Arkamys Procede de traitement sonore d'un signal stereophonique a l'interieur d'un vehicule automobile et vehicule automobile mettant en oeuvre ce procede
GB2541639B (en) * 2015-06-15 2019-06-12 Meridian Audio Ltd Asymmetric stereophonic bass compensation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02222299A (ja) * 1989-02-22 1990-09-05 Onkyo Corp 車載用ステレオ再生装置
JPH0540487A (ja) * 1991-08-06 1993-02-19 Matsushita Electric Ind Co Ltd 消音装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02222299A (ja) * 1989-02-22 1990-09-05 Onkyo Corp 車載用ステレオ再生装置
JPH0540487A (ja) * 1991-08-06 1993-02-19 Matsushita Electric Ind Co Ltd 消音装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2417870A (en) * 2004-09-02 2006-03-08 John David Michael Rogers Correcting back to front errors of the right channel which otherwise tend to mask other phase errors
GB2417870B (en) * 2004-09-02 2009-03-18 John David Michael Rogers Improvements in and relating to sound-transmission, sound-recording and sound-reproducing systems

Also Published As

Publication number Publication date
JP2003047097A (ja) 2003-02-14

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