WO2021149453A1 - 音響システム - Google Patents

音響システム Download PDF

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Publication number
WO2021149453A1
WO2021149453A1 PCT/JP2020/048540 JP2020048540W WO2021149453A1 WO 2021149453 A1 WO2021149453 A1 WO 2021149453A1 JP 2020048540 W JP2020048540 W JP 2020048540W WO 2021149453 A1 WO2021149453 A1 WO 2021149453A1
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Prior art keywords
speaker
listener
super
sound
electrodynamic
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Ceased
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English (en)
French (fr)
Japanese (ja)
Inventor
雅人 中山
琢真 江川
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Osaka Sangyo University
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Osaka Sangyo University
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Priority to JP2021573031A priority Critical patent/JPWO2021149453A1/ja
Publication of WO2021149453A1 publication Critical patent/WO2021149453A1/ja
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/12—Circuits for transducers for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems

Definitions

  • the present invention relates to an acoustic system that uses an electrodynamic speaker and a super-directional speaker to control the position of a virtual sound source from a listener.
  • Non-Patent Document 1 In the object-based method in a multi-channel stereophonic system, in order to construct a virtual sound source between speakers, it is controlled by sound pressure based on vector synthesis (Non-Patent Document 1), but the virtual sound source is controlled between the speaker and the listener. It was extremely difficult to build. However, in order to realize the virtual reality of the sound, not only the direction of arrival of the sound to the listener but also the control of the distance from the listener to the virtual sound source is a very important factor.
  • the binaural method (Non-Patent Document 2), which provides a virtual sound source using a head-related transfer function, is useful for sound source localization near the head, but it is difficult to construct a virtual sound source in the distance.
  • Non-Patent Document 3 A method of constructing a virtual sound source at an arbitrary position using an extremely large number of speakers, such as ultra-high presence communication technology (Non-Patent Document 3), is also being studied, but it is a large-scale facility such as a concert hall. Needs.
  • the present invention provides a Parametric-Array Loudspeaker (PAL), which is a super-directional speaker using ultrasonic waves, in order to control both the orientation and the distance between the listener and the virtual sound source in a small-scale acoustic system. Pay attention to it.
  • Figures 12 (a) and 12 (b) show the indoor impulse response of the electro-dynamic loudspeaker (EDL) and the super-directional speaker under the condition that the distance between the speaker and the sound receiving point is 2 m, respectively.
  • EDL electro-dynamic loudspeaker
  • the indoor impulse response of the parametric speaker is shown. As shown in FIG. 12, it can be seen that the subsequent reverberation of the indoor impulse response under the same conditions is significantly different between the conventional electrokinetic speaker (EDL) and the parametric speaker (PAL). This is because the super-directional speaker demodulates the audible sound as a secondary wave in the air by utilizing the non-linearity of air.
  • the Direct-to-Reverberant Ratio (DRR) which is the ratio of the reverberation to the direct wave of the indoor impulse response, is a clue to the sense of distance of the sound image perceived by humans. The sound image is easily localized in the vicinity.
  • FIG. 13 is a configuration diagram of an acoustic system disclosed in Patent Document 1.
  • the acoustic system shown in FIG. 13 includes one parametric speaker 10, four electrokinetic speakers 20, and a control unit 30.
  • the parametric speaker 10 is arranged in front of the listener O.
  • the four electrodynamic speakers 20 are arranged on the front left side, the front right side, the rear left side, and the rear right side with respect to the listener O, respectively.
  • the control unit 30 controls the parametric speaker 10 and the four electrokinetic speakers 20 so as to output the sound corresponding to the input signal S based on the input signal S which is an audio signal.
  • the speaker sound field of audible sound formed by the electrokinetic speaker and the super directional speaker sound field of audible sound formed by the super directional speaker overlap at the position of the listener.
  • a sound reproduction device in which an electrodynamic speaker and a super-directional speaker are arranged is disclosed.
  • the audible sound radiated from the electrokinetic speaker and the super-directional speaker is heard loudest when the listener is located at a predetermined distance dk in the sound axis direction from the position where each speaker is installed.
  • Patent Document 2 receives only one electrodynamic speaker and a super-directional speaker installed in the same direction with respect to the listener without arranging many electrodynamic speakers around the listener. The maximum sound pressure of audible sound is created in the vicinity of the listener, and a three-dimensional sound field that makes the listener feel surrounded by sound is realized.
  • Patent Document 1 controls the distance of a virtual sound source by installing a super-directional speaker in front in addition to the surround-arranged electrodynamic speaker.
  • the super-directional speaker is placed in front, the level difference between both ears (ILD) deteriorates, and the orientation presentation performance tends to deteriorate.
  • Patent Document 2 realizes a three-dimensional sound field that makes it feel as if the electrodynamic speaker and the super-directional speaker are juxtaposed, but is surrounded by sound, from the listener to the virtual sound source. It does not change the distance.
  • the present invention provides an acoustic system capable of giving a remote presence to the listener, and in particular, an acoustic system capable of controlling the binaural level difference and the direct ratio of the listener. With the goal.
  • the acoustic system of the present invention is an acoustic system in which a control unit controls the position of a virtual sound source from a listener by using an electrodynamic speaker and a super-directional speaker, and the electrodynamic speaker.
  • the first superdirectional speaker has at least a first electrodynamic speaker and a second electrodynamic speaker
  • the superdirectional speaker has at least a first superdirectional speaker and a second superdirectional speaker.
  • the first electrokinetic speaker and the first superdirectional speaker are arranged so that the sound output direction from the electrokinetic speaker and the sound output direction from the first superdirectional speaker coincide with each other.
  • the second electromotive speaker and the second superdirectional speaker so that the output direction of the sound from the second electromotive speaker and the output direction of the sound from the second superdirectional speaker coincide with each other.
  • a sex speaker is arranged, and the first output direction of the sound from the first electrokinetic speaker and the first superdirectional speaker, and the second electrokinetic speaker and the second superdirectional speaker.
  • the second output direction of the sound is crossed at the position of the listener, and the control unit receives an impulse response from the first electrokinetic speaker to the listener and the first super-directional speaker to the listener.
  • the first direct ratio is controlled by changing the energy ratio with the impulse response to the listener, and the impulse response from the second electrokinetic speaker to the listener and the second superdirectional speaker to the listener
  • the first output sound set by the first direct ratio and the second output sound set by the second direct ratio are controlled by changing the energy ratio with the impulse response up to.
  • the orientation and distance of the virtual sound source from the listener can be changed.
  • the first electrodynamic speaker and the first superdirectional speaker are arranged in a first housing, and the second electrodynamic speaker is arranged.
  • the speaker and the second super-directional speaker are arranged in the second housing.
  • the acoustic system of the present invention uses an electrodynamic speaker and a super-directional speaker.
  • An acoustic system in which the position of a virtual sound source from a listener is controlled by a control unit so that the sound output direction from the electrodynamic speaker and the sound output direction from the super-directional speaker coincide with each other.
  • the electrodynamic speaker and the super-directional speaker are arranged, and the control unit receives an impulse response from the electrodynamic speaker to the listener and an impulse response from the super-directional speaker to the listener.
  • the present invention according to claim 4 is characterized in that, in the acoustic system according to claim 3, the electrodynamic speaker and the super-directional speaker are arranged in one housing.
  • the present invention according to claim 5 is characterized in that a parametric speaker is used as the super-directional speaker in the acoustic system according to any one of claims 1 to 4.
  • the present invention by changing the distance between the listener and the virtual sound source, it is possible to give the listener a sense of remote presence.
  • the sound system according to the first embodiment of the present invention has at least a first electrodynamic speaker and a second electrodynamic speaker as electrodynamic speakers, and at least the first superdirectional speaker as superdirectional speakers. It has a sex speaker and a second super-directional speaker, and the first motion is such that the sound output direction from the first electrokinetic speaker and the sound output direction from the first super-directional speaker match.
  • the electric speaker and the first super directional speaker are arranged, and the second is such that the sound output direction from the second electrodynamic speaker and the sound output direction from the second super directional speaker coincide with each other.
  • An electrodynamic speaker and a second super-directional speaker are arranged, and the first output direction of the sound from the first electro-electric speaker and the first super-directional speaker, and the second electro-electric speaker and the second super-directional speaker are arranged.
  • the second output direction of the sound from the sex speaker is crossed at the position of the listener, and the control unit receives the impulse response from the first electrodynamic speaker to the listener and from the first super-directional speaker to the listener.
  • the ratio to control the second direct ratio By changing the ratio to control the second direct ratio, and controlling the first output sound set by the first direct ratio and the second output sound set by the second direct ratio by amplitude panning. , The direction and distance of the virtual sound source from the listener are changed.
  • the sense of distance to the virtual sound source can be so-called zoomed in and out, and can be controlled by amplitude panning, so that the listener can be given a sense of remote presence.
  • the amplitude panning is to change the sound image localization by giving an amplitude difference to the sound output from the speaker.
  • the first electrodynamic speaker and the first super-directional speaker are arranged in the first housing, and the second electrodynamic speaker is arranged.
  • the speaker and the second super-directional speaker are arranged in the second housing.
  • the acoustic system according to the third embodiment of the present invention has the electrodynamic speaker and the super-directional so that the output direction of the sound from the electrodynamic speaker and the output direction of the sound from the super-directional speaker coincide with each other.
  • the control unit controls the direct ratio by changing the energy ratio between the impulse response from the electrokinetic speaker to the listener and the impulse response from the super-directional speaker to the listener.
  • the position of the virtual sound source is moved closer to or farther from the listener.
  • the sense of distance to the virtual sound source can be so-called zoomed in or out, and the listener can be given a remote sense of presence. ..
  • the fourth embodiment of the present invention is to arrange the electrodynamic speaker and the super-directional speaker in one housing in the acoustic system according to the third embodiment. According to the present embodiment, by integrating the electrodynamic speaker and the super-directional speaker into an integrated speaker, the sound output direction from the electrodynamic speaker and the sound output direction from the super-directional speaker can be determined. Is easy to match.
  • the fifth embodiment of the present invention uses a parametric speaker as a super-directional speaker in the acoustic system according to any one of the first to fourth embodiments.
  • the amplitude panning can be performed by combining the electrokinetic speaker having a low impulse response direct ratio and the parametric speaker having a higher impulse response direct ratio, so that the distance of the virtual sound source can be obtained.
  • the direct ratio of the impulse response at the position of the listener which is a clue to the feeling, can be controlled more accurately.
  • FIG. 1 is a conceptual diagram showing an acoustic system according to a first embodiment of the present invention.
  • the electrodynamic speaker 20 and the super-directional speaker 10 are used, and the position of the virtual sound source P from the listener O is controlled by the control unit 30.
  • the super directional speaker 10 is, for example, a parametric speaker that uses ultrasonic waves as carrier waves.
  • the electrodynamic speaker 20 is generally used as an audio device, and is a dynamic drive type speaker using a permanent magnet and a movable coil, and generally has a low direct-to-direct ratio (small direct sound).
  • the electrodynamic speaker 20 and the super-directional speaker 10 are arranged so that the sound output direction from the electrodynamic speaker 20 and the sound output direction from the super-directional speaker 10 coincide with each other.
  • the direct ratio of the impulse response is a clue (index) of the sense of distance of the virtual sound source.
  • the listener O recognizes that the virtual sound source P is in a distant position, and in the super directional speaker 10 having a large direct ratio, the listener O has the virtual sound source P close to it. I feel there is.
  • the control unit 30 controls the super-directional speaker 10 and the electrokinetic speaker 20 so as to output a sound corresponding to the input signal based on the input signal.
  • the control unit 30 controls the direct ratio by changing the energy ratio between the impulse response from the electrokinetic speaker 20 to the listener O and the impulse response from the superdirectional speaker 10 to the listener O. By doing so, the control unit 30 brings the position of the virtual sound source P closer to or further away from the listener O. By changing the distance r between the listener O and the virtual sound source P in this way, the sense of distance to the virtual sound source P can be so-called zoomed in and out, and the listener O can be given a remote sense of presence. can.
  • the electrodynamic speaker The output signal x (t) from 20 is given by Eq. (1)
  • the output signal y (t) from the super-directional speaker 10 is given by Eq. (2).
  • t is the time
  • si (t) is the i-th normalized material sound (object) signal (I is the number of objects)
  • c (t) is the carrier wave (ultrasonic) signal
  • ⁇ ⁇
  • the weighting coefficients ⁇ and ⁇ can be calculated by the following equations, respectively.
  • the gain is calibrated so that the sound pressure level of the electrokinetic speaker 20 in the vicinity of the listener O and the sound pressure level of the super-directional speaker 10 in the vicinity of the listener O match.
  • the indoor impulse response from the super-directional speaker 10 to the listener O and the indoor impulse response from the electrokinetic speaker 20 to the listener O can be obtained.
  • a virtual sound source P can be constructed at the position of the distance r by synthesizing the direct-directivity ratio by changing the energy ratio so as to match the condition that the real sound source is installed at the position of the distance r.
  • FIG. 2 is a diagram showing an integrated speaker suitable for the acoustic system according to the first embodiment of the present invention.
  • the electrodynamic speaker 20 and the super-directional speaker 10 are arranged in one housing 40.
  • the sound output direction from the electrodynamic speaker 20 and the sound output direction from the super-directional speaker 10 can be determined. Is easy to match.
  • FIG. 2 shows a configuration in which the super-directional speaker 10 and the electrokinetic speaker 20 are arranged in the vertical direction, they may be arranged in the horizontal direction.
  • a plurality of ultrasonic wave generating elements are arranged in an array in the vertical direction and the horizontal direction.
  • the audible region can be set by arranging a plurality of ultrasonic wave generating elements in an array.
  • FIG. 3 is a conceptual diagram showing an acoustic system according to a second embodiment of the present invention.
  • the same functional elements as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
  • the acoustic system according to the present embodiment has at least a first electrodynamic speaker 20R and a second electrodynamic speaker 20L as the electrodynamic speaker 20, and at least the first superdirectional speaker as the superdirectional speaker 10. It has a 10R and a second super directional speaker 10L.
  • the sound output direction from the first electrodynamic speaker 20R and the sound output direction from the first superdirectional speaker 10R coincide with each other. Arrange as follows.
  • the sound output direction from the second electrodynamic speaker 20L and the sound output direction from the second superdirectional speaker 10L coincide with each other. Arrange as follows. Further, the first output direction of the sound from the first electrodynamic speaker 20R and the first superdirectional speaker 10R, and the second output direction of the sound from the second electrodynamic speaker 20L and the second superdirectional speaker 10L. Are crossed at the position of the listener O.
  • the first electrodynamic speaker 20R and the first super-directional speaker 10R are arranged in one housing 40 (first housing) to form an integrated speaker, and the second electrodynamic speaker 20L and the second super-directional speaker 20L and the second super-directional speaker are used.
  • the sex speaker 10L is preferably arranged in one housing (second housing) to form an integrated speaker.
  • the output direction of the sound from the first electrodynamic speaker 20R and the first super-directional speaker It is easy to match the output direction of the sound from the 10R
  • the second electromotive speaker 20L and the second super-directional speaker 10L into an integrated speaker
  • the sound output from the second electrodynamic speaker 20L It is easy to match the direction with the output direction of the sound from the second super directional speaker 10L.
  • the control unit 30 changes the energy ratio between the impulse response from the first electrodynamic speaker 20R to the listener O and the impulse response from the first superdirectional speaker 10R to the listener O to obtain the first direct ratio.
  • Control and control the second direct ratio by changing the energy ratio between the impulse response from the second electrodynamic speaker 20L to the listener O and the impulse response from the second superdirectional speaker 10L to the listener O.
  • the first output sound set by the first direct ratio and the second output sound set by the second direct ratio are controlled by impulse panning. Therefore, the direction and distance of the virtual sound source P from the listener O can be changed.
  • the level difference between the binaural ears and the direct-to-ear ratio of the listener O can be controlled, it is possible to particularly improve the presentation performance of the orientation of the virtual sound source P.
  • a parametric speaker as the super-directional speaker 10
  • amplitude panning is performed by combining the electrokinetic speaker 20 having a low direct ratio of impulse response and the parametric speaker having a higher direct ratio of impulse response. be able to. Therefore, the direct ratio of the impulse response at the position of the listener O, which is a clue to the sense of distance of the virtual sound source P, can be controlled more accurately.
  • the distance from the listener O to the first super directional speaker 10R, the second super directional speaker 10L, the first electrodynamic speaker 20R, and the second electrodynamic speaker 20L is d, the first super directional speaker 10R and The angle of the first electrodynamic speaker 20R is ⁇ s (0 ° ⁇ ⁇ s ⁇ 90 °), the angle of the second super-directional speaker 10L and the second electrodynamic speaker 20L is - ⁇ s, from the listener O to the virtual sound source P.
  • the signal xb (t) is the output signal from the electrokinetic speaker 20 in b-ch
  • yb (t) is the output signal from the super-directional speaker 10 in b-ch
  • si (t) is the i-th normalization.
  • signal has been material sound (object) (I is the number of objects)
  • the signal c (t) is the carrier wave (ultrasound)
  • the weighting coefficients ⁇ L r, ⁇ , ⁇ R r, ⁇ , ⁇ L r, ⁇ , ⁇ R r, and ⁇ can be calculated by the following equations, respectively.
  • the gain is calibrated so that the sound pressure level of the electrokinetic speaker 20 in the vicinity of the listener O and the sound pressure level of the super directional speaker 10 in the vicinity of the listener O match.
  • the indoor impulse response from the super-directional speaker 10 to the listener O and the indoor impulse response from the electrokinetic speaker 20 to the listener O are positioned.
  • the virtual sound source P can be constructed at the position of the distance r.
  • EDL Electro-Dynamic Loudspeaker
  • PAL Array Loudspeaker
  • PDL Electro-Dynamic integarated Loudspeaker
  • FIG. 4 is a layout diagram showing the setting conditions of the acoustic system according to the second embodiment of the present invention
  • FIG. 5 is a layout diagram showing the setting conditions of the acoustic system according to the comparative example
  • FIG. 6 shows the setting conditions of the acoustic system using the actual sound source. It is a layout drawing.
  • the virtual sound source and the real sound source are located at the same position, a dummy head (Neumann KU-100) is installed at the position of the listener O under each condition, and the indoor impulse response is performed by the TSP method [Berkhout et al., JASA, 68 (1). ), 179-183, 1980.].
  • DRR [Lu et al., IEEE ASLP, 18 (7), 1793-1805, 2010.] can be calculated by the following equation.
  • pe (n) is the measured indoor impulse response
  • T' is the signal length of the indoor impulse response.
  • the DRR error which is the average of the DRR errors between the real sound source and the virtual sound source at the measurement points, can be calculated by the following formula.
  • DRR Rm and DRR Vm are the DRRs of the real sound source and the virtual sound source at the m-th position, respectively.
  • the ILD [Watanabe et al., JASA, 122 (5), 2832-2841, 2007.] can be calculated by the following equation.
  • t is the time
  • p L (t) and p R (t) are the impulse responses measured by the left and right ears, respectively
  • T is the reverberation time.
  • the ILD error obtained by averaging the ILD errors of the real sound source and the virtual sound source at the measurement points can be calculated by the following formula.
  • ILD Rm and ILD Vm are the ILDs of the real sound source and the virtual sound source at the m-th position, respectively.
  • FIG. 7 is a graph showing the experimental result of the distance presentation performance (DRR), and FIG. 8 is a graph showing the experimental result of the directional presentation performance (ILD).
  • DRR distance presentation performance
  • ILD directional presentation performance
  • an array speaker or a curved reflector type speaker can also be used.
  • a pair of left and right speakers are arranged in front of the listener, but by further arranging a pair of left and right speakers behind the listener, the virtual sound source P can be generated by the listener. It can be moved away from the back of the O or closer to the back of the listener O.
  • the virtual sound source P can be moved from the front to the rear of the listener O, and further.
  • the virtual sound source P can be moved around the entire circumference of the listener O.
  • FIG. 9 is a diagram showing the setting conditions and the impulse response result in the acoustic system using the actual sound source
  • FIG. 10 is a diagram and the diagram showing the setting conditions and the impulse response result in the acoustic system using the comparative example (EDL: 2, PAL: 1).
  • 11 is a diagram showing the setting conditions and the impulse response result in the acoustic system according to the second embodiment (PDL: 2).
  • the actual sound source is arranged at a position 45 degrees to the left and 0.3 m from the position of the listener O as shown in FIG. 9A, and a comparative example shown in FIG.
  • the sound system according to the second embodiment shown in EDL: 2, PAL: 1) and FIG. 11, the left from the position of the listener O as shown in FIGS. 10 (a) and 11 (a).
  • the position of 45 degrees and 0.3 m is set as the virtual sound source position.
  • the microphone for the left ear and the microphone for the right ear were installed at the position of the listener O to perform the measurement.
  • the amplitude of the impulse response of Lch is large as shown in FIG. 9B, and the amplitude of the impulse response of Rch is small as shown in FIG. 9C.
  • EDL 2
  • PAL 1
  • the amplitude of the impulse response of Lch is large as shown in FIG. 10 (b)
  • the amplitude of Rch is large as shown in FIG. 10 (c).
  • the amplitude of the impulse response of is also large.
  • the amplitude of the left and right impulse responses becomes almost the same, especially in the vicinity of the listener O, because the sound source is reproduced by the parametric speaker (PAL) installed in front of the listener O. Because it is doing.
  • the amplitude of the impulse response of Lch is large as shown in FIG. 11 (b), but the amplitude of the impulse response of Rch is large as shown in FIG. 11 (c). Is small, and an impulse response close to that of the actual sound source shown in FIGS. 9 (b) and 9 (c) can be realized.
  • the energy ratio between the impulse response from the first electrodynamic speaker 20R to the listener O and the impulse response from the first superdirectional speaker 10R to the listener O is changed.
  • the first direct ratio is controlled, and the energy ratio between the impulse response from the second electrodynamic speaker 20L to the listener O and the impulse response from the second superdirectional speaker 10L to the listener O is changed to change the second direct.
  • the interval ratio is controlled, and the first output sound set by the first direct ratio and the second output sound set by the second direct ratio are controlled by impulse panning.

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  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • General Health & Medical Sciences (AREA)
  • Circuit For Audible Band Transducer (AREA)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022181678A1 (ja) * 2021-02-25 2022-09-01 学校法人大阪産業大学 音響システム

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004527968A (ja) * 2001-05-07 2004-09-09 アメリカン・テクノロジー・コーポレーション パラメトリックバーチャルスピーカー及びサラウンド音響システム

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004527968A (ja) * 2001-05-07 2004-09-09 アメリカン・テクノロジー・コーポレーション パラメトリックバーチャルスピーカー及びサラウンド音響システム

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Title
IKEFUJI DAISUKE, KURIMOTO SOTA, NAKAYAMA MASATO, NISHIURA TAKANOBU: "Auditory Distance Perception with Combination of Parametric and Dynamic Loudspeakers", PROCEEDINGS OF NCSP, vol. 13, 2013, pages 532 - 535, XP055843732 *
KURIMOTO, S. ET AL.: "Examination of distance control parameters of sound images by using parametric and nonparametric speaker together", LECTURE PROCEEDINGS OF 2012 SPRING RESEARCH CONFERENCE OF THE ACOUSTICAL SOCIETY OF JAPAN CD-ROM [ CD-ROM, 6 March 2012 (2012-03-06), pages 787 - 788 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022181678A1 (ja) * 2021-02-25 2022-09-01 学校法人大阪産業大学 音響システム

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