WO2010095620A1 - Dispositif de création de champ acoustique - Google Patents

Dispositif de création de champ acoustique Download PDF

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Publication number
WO2010095620A1
WO2010095620A1 PCT/JP2010/052290 JP2010052290W WO2010095620A1 WO 2010095620 A1 WO2010095620 A1 WO 2010095620A1 JP 2010052290 W JP2010052290 W JP 2010052290W WO 2010095620 A1 WO2010095620 A1 WO 2010095620A1
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WO
WIPO (PCT)
Prior art keywords
sound
reflected
creation device
open
output
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PCT/JP2010/052290
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English (en)
Japanese (ja)
Inventor
敏樹 羽入
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学校法人日本大学
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Publication of WO2010095620A1 publication Critical patent/WO2010095620A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H04S5/02—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals

Definitions

  • the present invention relates to a sound field creation device, and more particularly, to a sound field creation device that creates a sound field using a speaker and open headphones.
  • sound field reproduction techniques include a multi-channel reproduction system using a plurality of speakers installed around a listener, a headphone system that reproduces sound processed based on a head-related transfer function using headphones, and the like.
  • the multi-channel playback system using a plurality of speakers has a high sense of reality in the sound field, but there are problems in that it is difficult to secure a place for installing a plurality of speakers and to connect the speakers to an amplifier, a tuner, and the like. Furthermore, there is a problem that the listening point of the listener is limited and the effect of creating the sound field is greatly changed when the listener moves.
  • the headphone system is a solution to the above problems. If playback is performed using headphones, there are few problems with connection, and the position of the sound generation unit is fixed at the position of the ear, so that the listening point is not limited.
  • Patent Document 1 discloses a sound field reproduction apparatus that reproduces a front sound with a speaker and a rear sound with an open headphone in order to obtain a realistic sound field without arranging a rear speaker. ing. Further, in Patent Document 2, in order to provide a sound field that is easy to hear without giving a sense of blockage to a passenger in the rear seat of an automobile, frequency characteristic adjustment, delay time, and amplification factor are provided for signals of a plurality of channels. A sound field reproduction device that reproduces a synthesized sound subjected to the above adjustment from an open type headphone is disclosed.
  • head localization has been attempted to be resolved by outputting a signal obtained by convolving the head-related transfer function with a sound source.
  • the out-of-head localization has not been achieved, and the in-head localization has not been sufficiently solved.
  • the direction of sound generation is fixed to the movement of the listener and the rotation of the head.
  • the direction of sound generation is fixed to the movement of the listener and the rotation of the head.
  • the headphones are fixed to the head, so the sound can be heard from the direction of the front of the head.
  • unnatural sound localization is also a problem.
  • Patent Document 1 The device described in Patent Document 1 is intended to eliminate the rear speaker, and the device described in Patent Document 2 is intended to prevent the listener from feeling blocked, and the headphones described above.
  • the problem of in-head localization and unnatural localization in reproduction has not been solved at all.
  • the present invention intends to provide a sound field creation device that eliminates in-head localization and unnatural localization.
  • a sound field creation device includes one or more speakers that output sound from a sound source, and reflected sound generation that generates reflected sound based on the sound from the sound source. And an open headphone that outputs the reflected sound from the reflected sound generator, and the open sound so that the reflected sound output from the open headphone reaches the listener's ear after the sound output from the speaker.
  • a signal processing unit that delays the reflected sound output from the headphones.
  • the reflected sound generation unit may generate the reflected sound using the head-related transfer function.
  • the reflected sound generation unit may generate a reflected sound that becomes a reverberant sound.
  • the reflected sound generation unit may generate a reflected sound that becomes a reverberant sound.
  • a level adjusting unit that changes the ratio of the magnitude of the reflected sound output from the open headphones and the sound output from the speaker may be provided.
  • the signal processing unit may be configured to change the sound field felt by the listener by changing the delay time of the reflected sound output from the open headphones.
  • the microphone includes a microphone that receives sound output from the speaker, the microphone is disposed in the vicinity of the open-type headphones, and the reflected sound generation unit is configured to generate reflected sound from the sound received by the microphone. You may do it.
  • the sound field creation device includes a microphone that receives sound, a reflected sound generation unit that generates reflected sound based on sound received by the microphone, and a microphone disposed in the vicinity, Headphone that outputs the reflected sound from the head and the headphone output so that the reflected sound that is output from the headphone reaches the listener's ear after the sound received by the microphone. And a signal processing unit that delays the reflected sound.
  • the sound field creation device of the present invention has an advantage that it is possible to eliminate in-head localization and unnatural localization. There is also an advantage that an arbitrary sound field can be created by eliminating the influence of the sound receiving environment.
  • FIG. 1 is a schematic block diagram for explaining the configuration of the sound field creation device of the first embodiment of the present invention.
  • FIG. 2 is a schematic block diagram for explaining the configuration of the sound field creation apparatus of the second embodiment of the present invention.
  • FIG. 1 is a schematic block diagram for explaining the configuration of the sound field creation device of the first embodiment of the present invention.
  • the sound field creation device of the present invention mainly includes a sound source 10, a speaker 20, a reflected sound generation unit 30, an open type headphone 40, and a signal processing unit 50.
  • the sound source 10 supplies sound that is the source of the sound field created by the sound field creation device of the present invention.
  • the sound to be supplied may be any sound. Specifically, any device that reproduces sound information recorded on, for example, a music CD or DVD may be used.
  • the sound to be reproduced may be a stereo sound or a monaural sound, or may be a multi-channel signal such as 5.1ch. Furthermore, it may be a sound that includes a reflected sound or a direct sound that does not include a reflected sound.
  • the speaker 20 outputs the sound from the sound source 10.
  • positioning location of the speaker 20 is not specifically limited. In the sound field creation device of the present invention, if the speaker is arranged in front of the listener, the listener recognizes that the sound is generated from the front. Therefore, for example, when viewing an orchestra DVD with video, if it is placed near the front monitor, the listener feels that sound is being generated from the direction of the orchestra displayed on the monitor.
  • the speaker of the sound field creation apparatus of this invention is not limited to a specific thing, What is necessary is just generally available.
  • the reflected sound generation unit 30 generates a reflected sound based on the sound from the sound source 10.
  • the direct sound generated from the speaker 20 is artificially created as a sound that is reflected on a wall or ceiling and reaches the listener's ear.
  • the reflected sound is a concept including a reverberant sound and a reverberant sound as described later.
  • the reflected sound generation unit 30 adds a three-dimensional sound spread. If the original sound of the sound source 10 includes a reverberation sound or a reverberation sound, the reflected sound generation unit 30 generates a reflected sound by using the sound. Even when the original sound of the sound source 10 includes only direct sound, a reflected sound may be generated in a pseudo manner as described below.
  • the reflected sound generating unit 30 may generate several reflected sounds when generating a reflected sound that becomes a reverberant sound.
  • a single reflected sound means a simulated one route from the sound emitted from a sound source reflected on a wall or the like to reach the listener's ear.
  • the reflected sound generator 30 calculates several of these using the head-related transfer function.
  • the head-related transfer function represents a change in sound caused by peripheral objects including the ear shell, the human head, and the shoulder as a transfer function. By generating several reflected sounds, it becomes a reverberant sound and can express a three-dimensional sound spread.
  • the reflected sound generating unit 30 may generate a large number of reflected sounds using a head-related transfer function.
  • a reverberant sound can be expressed by convolving a head-related transfer function of a large number of reflected sounds.
  • the reflected sound can be variously changed depending on the sound field to be created.
  • the reflected sound may be appropriately selected according to the reflected sound in the sound field environment to be created, such as a concert hall or a live house.
  • the reflected sound generation unit 30 uses only a few reflected sounds while taking advantage of the reverberation feeling.
  • a three-dimensional sound spread may be added by using the head-related transfer function. If only the direct sound is included, in order to add both a reverberation feeling and a three-dimensional expansion, the reflected sound generation unit 30 converts the reflected sound into a head related transfer function based on the direct sound. May be used.
  • the open-type headphones 40 output the reflected sound from the reflected sound generating unit 30 described above. That is, only the reflected sound is output from the open type headphones 40. As described later, the reflected sound generated by the reflected sound generation unit 30 is output by the open headphones 40 via the signal processing unit 50.
  • the open headphone 40 is also called, for example, an open air headphone, and the back surface of the sound generation unit is open so that external sounds can freely enter and exit. Further, a space may be provided not only on the back surface portion of the headphones but also on the ear surface portion side.
  • the open headphones of the sound field creation device of the present invention are not limited to specific ones, and may be any generally available headphones.
  • the listener When the listener wears such an open type headphone 40, the listener listens to the sound from the sound source 10 from the speaker 20 and listens to the reflected sound from the open type headphone 40. Since the open headphone 40 is used, it does not interfere with listening to the sound output from the speaker 20.
  • the signal processing unit 50 delays the reflected sound output from the open headphone 40 so that the reflected sound output from the open headphone 40 reaches the listener's ear after the sound output from the speaker 20. It is something to be made. That is, the reflected sound from the reflected sound generation unit 30 is subjected to delay processing so that the sound output from the speaker 20 reaches the listener's ear earlier than the sound output from the open headphones 40. As a specific example of the delay amount, for example, when the distance between the speaker 20 and the listener is 3 meters, if the delay is about 0.009 seconds, that is, 9 milliseconds or more, the sound from the speaker 20 becomes faster. It reaches the listener's ear.
  • 10 milliseconds or more including 1 millisecond may be set as the delay amount so that a synthesized sound image of the sound output from the speaker 20 and the sound output from the open headphone 40 cannot be formed.
  • the delay amount may be appropriately changed according to the distance between the speaker 20 and the open headphones 40.
  • the sound field felt by the listener may be changed by changing the ratio of the magnitude of the reflected sound output from the open headphones 40 and the sound output from the speaker 20.
  • the level adjustment unit 55 is disposed between the sound source 10 and the speaker 20. The level adjustment unit 55 can adjust the loudness of the speaker 20. When the reflected sound output from the open headphones 40 is constant and the sound output from the speaker 20 is increased by the level adjusting unit 55, it can be felt as if it is approaching a sound source. Conversely, if the sound output from the speaker 20 is reduced, it can be felt as if the sound source has moved away.
  • the sound field felt by the listener may be changed by increasing or decreasing the reflected sound generated by the reflected sound generating unit 30 and output from the open headphones 40 by, for example, the signal processing unit 50.
  • the sound field creation device of the present invention can perform various controls such as a sense of distance to the sound source, a sense of reverberation, and a sense of spread by changing the ratio of the loudness.
  • the signal processing unit 50 may change the sound field felt by the listener by changing the delay time of the reflected sound output from the open headphones 40. For example, if the delay time is lengthened, the reflected sound is heard with a delay, so that it can be felt in a wide space. On the contrary, when the delay time is shortened, the reflected sound can be heard immediately, so that it can be felt in a narrow space.
  • the sound field creation apparatus of the present invention can create various sound fields by changing the delay time of the reflected sound generated by the reflected sound generation unit and output from the open headphones. It may be configured. Of course, various combinations of the ratio between the delay time and the loudness may be used.
  • the signal processing unit 50 performs a delay process on the output of the reflected sound generation unit 30 or changes the ratio of the sound volume and the delay time. It is not limited, and various signal processing may be applied to the output of the open type headphone 40 that is finally output. Therefore, the signal processing unit 50 is arranged between the sound source 10 and the reflected sound generation unit 30, and is configured so that the reflected sound generation unit 30 generates a reflected sound after performing signal processing on the output from the sound source 10 in advance. May be.
  • the signal processing unit 50 may be configured to output sound processed using an effector, an amplifier, a filter, or the like from the speaker 20 or the open headphones 40 as necessary.
  • the sound from the sound source output from the speaker 20 first reaches the listener's ear, and then the reflected sound output from the open headphones 40 is received. To reach.
  • human hearing has the first wavefront law of feeling the direction of the sound with respect to the sound first heard.
  • the second wavefront is delayed by, for example, 1 millisecond or more so that the second wavefront is heard after the first wavefront, the sound direction of sound is localized in the direction of the first wavefront. That is, in the sound field creation device of the present invention, the sound of the speaker 20 is heard first, so that the direction of the sound is localized in the direction of the speaker 20. Therefore, when synthesized with the reflected sound output from the open headphones 40, the listener feels that the sound has been localized outside the head. That is, the reflected sound that can be localized in the head because of the headphone output is pulled out of the speaker by the law of the first wavefront and is localized outside the head.
  • the listener can eliminate the localization in the head by the speaker while feeling the three-dimensional sound spread by the reflected sound from the open headphones. .
  • the sound field creation device of the present invention even if the listener rotates his / her head, the position of the speaker is fixed, so that the direction of sound production is always localized in the direction of the speaker. Therefore, it is possible to eliminate unnatural localization.
  • the sound field creation device of the present invention it is possible to create a sound field without installing a speaker next to or behind the listener.
  • FIG. 2 is a schematic block diagram for explaining a sound field generating apparatus according to the second embodiment of the present invention.
  • the same reference numerals as those in FIG. 1 denote the same parts.
  • the sound field creation device is based on the sound field creation device according to the first embodiment, and further includes a microphone 60.
  • the microphone 60 is configured to receive sound output from the speaker 20 and is disposed in the vicinity of the open headphones 40.
  • the microphone 60 may be installed integrally with the open type headphones 40. By arranging the microphone 60 in the vicinity of the open headphones 40, the sound from the speaker 20 can be received by the microphone 60 at the timing when the sound output from the speaker 20 reaches the listener.
  • the microphone 60 may be a stereo microphone or a monaural microphone, and may be a multi-channel microphone using a plurality of microphones. Moreover, it is not limited to a specific thing, What is necessary is just generally available.
  • the reflected sound generation unit 30 is configured to generate the reflected sound based on the sound from the sound source 10, but in the second embodiment, the reflected sound generation is performed.
  • the unit 30 is configured to generate a reflected sound from the sound received by the microphone 60. That is, in the first embodiment, the sound from the sound source 10 is directly input to the reflected sound generation unit 30 to generate the reflected sound, but in the second embodiment, the sound from the sound source 10 is output from the speaker 20.
  • the sound received by the microphone 60 is input to the reflected sound generation unit 30 to generate the reflected sound. Therefore, in the sound field creation device of the second embodiment, the sound from the sound source 10 is indirectly input to the reflected sound generation unit 30.
  • the sound output from the speaker 20 is received by the microphone 60 in the listening environment, and the received sound is input to the reflected sound generation unit 30.
  • the reflected sound generation unit 30 can also perform a filter process or the like so as to eliminate the influence of the listening environment from the received sound. This makes it possible to create an arbitrary sound field by eliminating the influence of the sound receiving environment to some extent.
  • the sound field reproduction apparatus is a level for changing the ratio of the magnitude of the reflected sound output from the open headphones and the sound output from the speaker, as in the first embodiment.
  • An adjustment unit may be provided, and the delay time may be changed as appropriate.
  • the sound from the sound source 10 is reproduced by the speaker 20 and received by the microphone 60 disposed in the vicinity of the open headphones 40.
  • the present invention is not limited to this, and the sound received by the microphone is not limited to the sound output from the speaker. That is, a raw sound may be used without using a sound source or a speaker.
  • a raw sound may be used without using a sound source or a speaker.
  • the sound field creation device of the present invention is not limited to the above-described illustrated examples, and it is needless to say that various modifications can be made without departing from the gist of the present invention.
  • the reflected sound generation unit and the signal processing unit are illustrated separately from the open headphones, but the present invention is not limited to this, and these functions are incorporated in the open headphones, and the integrated sound is generated.
  • it may be used as a field creation device.

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

Abstract

La présente invention concerne un dispositif de création de champ acoustique qui peut éliminer une localisation intracérébrale ou un sentiment de localisation anormal. Un dispositif de création de champ acoustique qui crée un champ acoustique se compose d'un haut-parleur (20), d'une section de création de son de réflexion (30), d'un casque d'écoute ouvert (40), et d'une section de traitement de signal (50). Le haut-parleur (20) émet un son provenant d'une source sonore (10). La section de création de son de réflexion (30) crée un son de réflexion basé sur le son provenant de la source sonore (10). Le casque d'écoute ouvert (40) émet le son de réflexion en provenance de la section de création de son de réflexion (30). La section de traitement de signal (50) retarde le son de réflexion émis depuis le casque d'écoute ouvert (40) de telle sorte que le son de réflexion émis depuis le casque d'écoute ouvert (40) arrive plus tard à l'oreille d'un auditeur que le son émis depuis le haut-parleur (20).
PCT/JP2010/052290 2009-02-17 2010-02-16 Dispositif de création de champ acoustique WO2010095620A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-034520 2009-02-17
JP2009034520A JP5505763B2 (ja) 2009-02-17 2009-02-17 音場創生装置

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WO2010095620A1 true WO2010095620A1 (fr) 2010-08-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112015004808B4 (de) 2014-10-24 2023-04-27 Kawai Musical Instruments Manufacturing Co., Ltd. Vorrichtung zur Effekterzeugung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6344125B2 (ja) * 2014-07-31 2018-06-20 セイコーエプソン株式会社 表示装置、表示装置の制御方法、および、プログラム
WO2018092286A1 (fr) * 2016-11-18 2018-05-24 ヤマハ株式会社 Dispositif de traitement de son, procédé de traitement de son et programme

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0338695A (ja) * 1989-07-05 1991-02-19 Shimizu Corp 可聴型室内音場シミュレータ
JPH03128598A (ja) * 1989-05-19 1991-05-31 Sanyo Electric Co Ltd ヘッドホン及び音響再生装置
JP2000078699A (ja) * 1998-08-31 2000-03-14 Sharp Corp 音響装置
JP2000308199A (ja) * 1999-04-16 2000-11-02 Matsushita Electric Ind Co Ltd 信号処理装置および信号処理装置の製造方法
JP2002135898A (ja) * 2000-10-19 2002-05-10 Matsushita Electric Ind Co Ltd 音像定位制御ヘッドホン
WO2005048653A1 (fr) * 2003-11-12 2005-05-26 Lake Technology Limited Systeme et procede de traitement de signaux audio

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03128598A (ja) * 1989-05-19 1991-05-31 Sanyo Electric Co Ltd ヘッドホン及び音響再生装置
JPH0338695A (ja) * 1989-07-05 1991-02-19 Shimizu Corp 可聴型室内音場シミュレータ
JP2000078699A (ja) * 1998-08-31 2000-03-14 Sharp Corp 音響装置
JP2000308199A (ja) * 1999-04-16 2000-11-02 Matsushita Electric Ind Co Ltd 信号処理装置および信号処理装置の製造方法
JP2002135898A (ja) * 2000-10-19 2002-05-10 Matsushita Electric Ind Co Ltd 音像定位制御ヘッドホン
WO2005048653A1 (fr) * 2003-11-12 2005-05-26 Lake Technology Limited Systeme et procede de traitement de signaux audio

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112015004808B4 (de) 2014-10-24 2023-04-27 Kawai Musical Instruments Manufacturing Co., Ltd. Vorrichtung zur Effekterzeugung

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JP2010193105A (ja) 2010-09-02

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