WO2012141057A1

WO2012141057A1 - Sound field generating device, sound field generating system and method of generating sound field

Info

Publication number: WO2012141057A1
Application number: PCT/JP2012/059244
Authority: WO
Inventors: 定浩安良; 村田　寿子; 菅原　隆幸; 宮内　和行
Original assignee: 株式会社Ｊｖｃケンウッド
Priority date: 2011-04-14
Filing date: 2012-04-04
Publication date: 2012-10-18

Abstract

A sound field generating device (2) according to the present invention is provided with: a speaker unit (30) which has a speaker for outputting sound having no less than two channels and which outputs an acoustic signal toward a reflective unit (40) that reflects sound output from the speaker so as to transmit the sound to a listener (60); and a crosstalk cancelling computation unit (20) which performs computations such that the crosstalk between each channel for the acoustic signal that arrives at the listener (60) after being reflected by the reflective unit (40) is cancelled at the position of the listener (60) with respect to an input signal input thereinto, the input signal being input such that the sound image of the acoustic signal that arrives at the listener (60) after being output from the speaker unit (30) and reflected by the reflective unit (40) is localized as a virtual sound source at the position of the listener (60).

Description

SOUND FIELD GENERATING DEVICE, SOUND FIELD GENERATING SYSTEM, AND SOUND FIELD GENERATING METHOD

The present invention relates to a sound field generation device, a sound field generation system, and a sound field generation method, and in particular, a sound field generation device, a sound field generation system, and a sound field that generate a sound field using two or more channels of speakers. It relates to the generation method.

Patent Document 1 discloses an in-vehicle speaker system for stereo reproduction for a listener who rides on a front part. In this in-vehicle speaker system, a pair of left and right speakers are provided on the instrument panel. The reproduced sound from the speaker is reflected on the windshield and reaches the listener in the driver's seat or passenger seat. The reproduced sound from the right speaker reaches the passenger seat listener, and the reproduced sound from the left speaker reaches the driver seat listener. Since the input signal is output from the speaker as it is, the sound field in front of the listener can be reproduced like a conventional stereo sound field, but the sound image localization in the rear of the listener cannot be reproduced.

Patent Document 2 discloses a signal conversion device that converts a binaural signal that has been binaurally recorded. In Patent Document 2, a binaural signal is converted into a modified binaural signal so as to cancel out crosstalk that should occur in the reproduction sound field. The modified binaural signal is given to a plurality of speakers. Patent Document 3 discloses a playback system that plays back in a stereo dipole system. In the reproduction system of Patent Document 3, the spread angle of the loudspeaker pair is set in a range of 6 to 20 degrees.

JP-A-5-328883 JP-A-52-40101 Special Table 2000-529106

However, the method of Patent Document 3 has a problem that it cannot be applied to an environment such as the interior of an automobile. For example, when the stereo dipole method is used, even if the speaker is installed toward the ear, the influence of shielding by the handle or reflection by the side glass occurs. In particular, the interior of an automobile is an asymmetrical environment. For example, when the listener is a driver, the distance from the driver to the right side glass is shorter than the distance to the left side glass. Therefore, the influence of the reflection by the right side glass greatly appears on the driver's right ear, and the left and right reflections become non-uniform. Furthermore, it is not appropriate to place a speaker on the dashboard because placing the speaker on the dashboard to deliver sound directly to the listener will interfere with the driver's visual field.

The present invention has been made in view of the above problems, and provides a sound field generation device, a sound field generation system, and a sound field generation method capable of appropriately generating a sound field even in various environments. With the goal.

In order to solve the above-described problems and achieve the object, the present invention includes a speaker that outputs sound of two or more channels, and reflects the sound output from the speaker to transmit the sound to the listener. A speaker unit that outputs an acoustic signal toward the unit, and a sound image of the acoustic signal that is output from the speaker unit and reflected by the reflecting unit and reaches the listener is localized as a virtual sound source at the listener's position An arithmetic operation is performed so that the crosstalk between the channels of the acoustic signal that is input to the audio signal and is reflected by the reflection unit and reaches the listener is canceled at the position of the listener. And a crosstalk cancellation calculation unit that performs processing.

In the present invention, a sound image of an acoustic signal that is output from a speaker unit having a speaker that outputs sound of two or more channels and is reflected by a reflection unit and reaches a listener is localized as a virtual sound source at the listener's position. And the crosstalk between the channels of the acoustic signal reflected by the reflection unit and reaching the listener is canceled at the position of the listener. And a step of outputting an acoustic signal toward the reflection unit that reflects the sound output from the speaker unit and transmits the sound to the listener. .

As described above, according to the present invention, it is possible to provide a sound field generation device, a sound field generation system, and a sound field generation method that can generate an appropriate sound field even in various environments.

FIG. 1A is a block diagram of a configuration of the sound field generation system according to the first embodiment. FIG. 1B is a block diagram illustrating a configuration of the sound field generation system according to the first embodiment. FIG. 2 is a diagram illustrating an overall configuration of the sound field generation system according to the first embodiment. FIG. 3 is a block diagram showing the sound image localization calculation unit. FIG. 4A is a diagram illustrating a crosstalk cancellation calculation unit. FIG. 4B is a diagram illustrating a crosstalk cancellation calculation unit. FIG. 5 is a top view showing an installation example 1 of the first embodiment. 6A is a side view showing Installation Example 1 of Embodiment 1. FIG. 6B is a side view showing Installation Example 1 of Embodiment 1. FIG. FIG. 6C is a side view showing a state where the driver's seat is moved backward. FIG. 7 is a top view showing an installation example 2 of the first embodiment. FIG. 8 is a top view showing an installation example 3 of the first embodiment. FIG. 9 is a top view showing an installation example 4 of the first embodiment. FIG. 10 is a top view showing an installation example 5 of the first embodiment. FIG. 11 is a top view showing an installation example 6 of the first embodiment. FIG. 12 is a perspective view showing a left speaker and a left reflecting portion used in Installation Example 7 of the first embodiment. FIG. 13A is a top view showing an installation example 7 of the first embodiment. FIG. 13B is a top view illustrating the installation example 7 of the first embodiment. FIG. 14 is a perspective view showing a speaker unit and a reflection unit used in Installation Example 8 of the first embodiment. FIG. 15 is a top view showing an installation example 8 of the first embodiment. FIG. 16 is a top view showing an installation example 9 of the first embodiment. FIG. 17 is a side view showing an installation example 9 according to the first embodiment. FIG. 18A is a block diagram of a configuration of the sound field generation system according to the second embodiment. FIG. 18B is a block diagram of a configuration of the sound field generation system according to the second embodiment. FIG. 19 is a diagram illustrating an overall configuration of a sound field generation system according to the second embodiment. FIG. 20 is a diagram schematically showing a recording site where binaural recording is performed using a dummy head. FIG. 21 is a block diagram of a configuration of a speaker unit unit of the sound field generation system according to the third embodiment. FIG. 22 is a perspective view illustrating a configuration example of the speaker unit. FIG. 23 is a perspective view illustrating a configuration example of the speaker unit. FIG. 24 is a perspective view illustrating a configuration example of the speaker unit. FIG. 25 is a diagram illustrating a state in which an acoustic signal is reflected by the speaker unit. FIG. 26 is a side view showing an installation example of the speaker unit section. FIG. 27 is a block diagram of a configuration of the sound field generation system according to the fourth embodiment. FIG. 28 is a diagram schematically illustrating a state in which the user is seated in a passenger seat and a rear seat of an automobile. FIG. 29 is a block diagram of a configuration of the sound field generation system according to the fifth embodiment. FIG. 30 is a diagram illustrating an overall configuration of a sound field generation system according to the fifth embodiment. FIG. 31 is a block diagram of a configuration of the sound field generation system according to the sixth embodiment. FIG. 32 is a diagram illustrating an overall configuration of a sound field generation system according to the sixth embodiment. FIG. 33 is a block diagram showing a speaker unit portion provided with a lens portion. FIG. 34 is a top view showing an asymmetric arrangement of speakers. FIG. 35 is a side view showing an asymmetric arrangement of speakers. FIG. 36 is a block diagram of a configuration of the sound field generation system according to the seventh embodiment. FIG. 37 is a block diagram of a configuration of the sound field generation system according to the eighth embodiment. FIG. 38 is a top view showing a state where the sound field generation system according to the eighth embodiment is installed in an automobile. FIG. 39 is a top view showing a state in which the right side glass is opened. FIG. 40 is a side view showing the open / close position of the side glass for switching the direction of the right speaker. FIG. 41 is a top view showing a state in which the sound field generation system according to the ninth embodiment is installed in an automobile. FIG. 42 is a top view showing a state in which the roof glass is opened. FIG. 43A is a block diagram of a configuration of the sound field generation system according to the tenth embodiment. FIG. 43B is a block diagram of a configuration of the sound field generation system according to the tenth embodiment. FIG. 44 is a diagram illustrating an overall configuration of a sound field generation system according to the tenth embodiment.

Hereinafter, embodiments of a sound field generating device, a sound field generating system, and a sound field generating method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1A and 1B are block diagrams showing a configuration of a sound field generation system according to Embodiment 1. FIG. FIG. 2 is a diagram schematically showing the overall configuration of the sound field generation system. The sound field generation system 1 includes a sound image localization calculation unit 10, a crosstalk cancellation calculation unit 20, a speaker unit 30, and a reflection unit 40. The sound image localization calculation unit 10, the crosstalk cancellation calculation unit 20, and the speaker unit 30 constitute the sound field generation device 2. In the present embodiment, the speaker unit 30 in the sound field generation system 1 has two speakers arranged close to each other. That is, the speaker unit 30 includes a left speaker 31 and a right speaker 32. Further, as shown in FIG. 1B, the sound field generation system 1 may be configured to include a sheet 110 and a sheet sensor 111 in addition to the configuration of FIG. 1A.

An input signal p (t) that is an audio signal is input to the sound image localization calculation unit 10. In the present embodiment, description will be made assuming that the input signal p (t) is a monaural signal. The input signal p (t) is input to the sound field generation device 2 by reproducing a CD (Compact Disc), a DVD (Digital Versatile Disc), an MP3 player, or the like. The sound image localization calculation unit 10 performs a left ear stereo signal Ls obtained by performing calculation processing for appropriately locating the virtual sound source p ′ (t) at the listening position of the listener 60 with respect to the input signal p (t). And a stereo signal Rs for the right ear can be obtained. That is, two-channel stereo signals Ls and Rs are generated. In this embodiment, a sound field generation system that outputs two-channel audio will be described. However, the number of channels may be two or more.

The crosstalk cancellation calculation unit 20 performs a crosstalk cancellation process on the stereo signals Ls and Rs based on the input audio signal. As a result, speaker signals Lsp and Rsp can be obtained as audio signals whose crosstalk has been canceled at the ears of the listener 60. That is, the influence on the right ear 62 due to the sound emitted from the left speaker 31 and the influence on the left ear 61 due to the sound emitted from the right speaker 32 can be reduced. The crosstalk when the sound signal is actually output from the speaker unit 30 is canceled, and the sound signal that reaches the left ear 61 via the sound field is processed so as to be the same sound signal as the stereo signal Ls. The sound signal that reaches the right ear 62 via is processed so that it becomes the same sound signal as the stereo signal Rs.

The sound image localization calculation unit 10 and the crosstalk cancellation calculation unit 20 are configured by, for example, FIR (Finite Impulse Response) filter processing by a DSP (Digital Signal Processor).

The speaker unit 30 is a stereo speaker and includes a left speaker 31 and a right speaker 32. The speaker unit 30 emits an acoustic signal based on the speaker signals Lsp and Rsp in which the sound image is localized with respect to the listener 60 and the crosstalk is canceled. That is, the left speaker 31 outputs an acoustic signal based on the speaker signal Lsp, and the right speaker 32 outputs an acoustic signal based on the speaker signal Rsp. The speaker signal Lsp includes a cancel component for canceling the influence of the sound from the right speaker 32 on the left ear 61, and the sound from the left speaker 31 is transmitted to the right ear 62 in the speaker signal Rsp. A cancel component for canceling the influence is included.

The reflection unit 40 is disposed opposite to the sound emission surface of the speaker unit 30. The left speaker 31 and the right speaker 32 output acoustic signals corresponding to the speaker signals Lsp and Rsp toward the reflection unit 40. The reflection unit 40 includes a left reflection unit 41 and a right reflection unit 42. The left reflection unit 41 reflects the acoustic signal radiated from the left speaker 31 toward the left ear 61 of the listener 60. The right reflection unit 42 reflects the acoustic signal output from the right speaker 32 toward the right ear 62 of the listener 60. As the left reflecting portion 41 and the right reflecting portion 42, a wall surface or a window glass in an acoustic signal output environment can be used. Further, the left reflection unit 41 and the right reflection unit 42 may be provided in the speaker unit 30.

The seat 110 shown in FIG. 1B is a seat on which the listener 60 sits, and the seat sensor 111 detects the seat position of the seat 110. From the seat position detected by the seat sensor 111, the position of the ear of the listener 60 who has boarded the seat sensor 111 is estimated. The sheet sensor 111 outputs a detection signal indicating the sheet position to the crosstalk cancellation calculation unit 20, and the crosstalk cancellation calculation unit 20 changes the transfer function according to the sheet position, as will be described later.

As described above, the crosstalk is canceled so that the component of the stereo signal Ls in the acoustic signal output from the left speaker 31 does not affect the right ear 62. Similarly, the crosstalk is canceled so that the stereo signal Rs component of the acoustic signal output from the right speaker 32 does not affect the left ear 61. Therefore, the signals Le and Re in the left ear 61 and the right ear 62 of the listener 60 are in a state where the crosstalk is canceled. Therefore, a sound field similar to the sound field at the position of the virtual listener 80 can be generated.

In this embodiment, the sound field is generated as described above. Since the sound image localization calculation unit 10 performs calculation so that the sound image is localized at the position of the listener, the listener 60 can localize an appropriate virtual sound source. Furthermore, since the crosstalk is canceled, the listener 60 can listen as if the stereo signal Rs and the stereo signal Ls are output from the virtual sound source. Thereby, the listener 60 can listen to a three-dimensional sound field. In addition, the sound from the speaker unit 30 reaches the listener 60 via the reflection unit 40. By disposing the left speaker 31 and the right speaker 32 toward the reflecting unit 40, direct sound from the left speaker 31 and the right speaker 32 is prevented from reaching the listener 60. For example, the acoustic signal output from the left speaker 31 can be prevented from reaching the left ear 61 directly. Disturbance of the sound field due to a mixture of a direct sound that reaches the listener 60 without passing through the reflector 40 and a reflected sound that reaches the listener 60 via the reflector 40 can be reduced.

Further, in the configuration shown in FIG. 1B, the crosstalk cancellation calculation unit 20 changes the transfer function according to the position of the seat 110 on which the listener 60 sits, and sets the relative position among the speaker unit 30, the reflection unit 40, and the listener 60. Crosstalk is canceled with the corresponding transfer function. Thereby, a transfer function can be optimized and a sound field can be generated more appropriately.

Next, processing in the sound image localization calculation unit 10 will be described. FIG. 3 is a diagram schematically showing processing in the sound image localization calculation unit 10. The sound image can be localized by performing a convolution operation on the input signal p (t), which is a monaural signal input to the sound image localization calculation unit 10, by the sound image localization calculation unit 10. Specifically, the sound image localization calculation unit 10 includes

convolution calculation units

11 and 12. The convolution operation unit 11 can obtain the stereo signal Ls by performing the convolution operation of the input signal p (t) and the transfer function bl (t). Similarly, the convolution operation unit 12 can obtain the stereo signal Rs by performing the convolution operation of the input signal p (t) and the transfer function br (t). Specifically, Ls (t) = p (t) * bl (t) and Rs (t) = p (t) * br (t). bl (t) and br (t) are set according to the position of the desired virtual sound source. The stereo signals Ls and Rs calculated by the sound image localization calculation unit 10 are given a time difference, a volume difference and the like according to the position of the sound image.

Next, processing in the crosstalk cancellation calculation unit 20 will be described with reference to FIGS. 4A and 4B. The crosstalk cancellation processing in the crosstalk cancellation calculation unit 20 uses, for example, the crosstalk cancellation processing described in JP-A-52-40101. As shown in FIG. 2, the transfer function (transfer characteristic) from the left speaker 31 to the left ear 61 is a11, the transfer function from the left speaker 31 to the right ear 62 is a21, and the right speaker 32 to the left ear 61 is The transfer function is a12, and the transfer function from the right speaker 32 to the right ear 62 is a22. Thus, the transfer functions a11, a12, a21, and a22 are filter coefficients indicating the transmission characteristics from the left and right speakers to the left and right ears. The transfer function a11 is set according to the position of the left ear 61 with respect to the left speaker 31, and the transfer function a21 is set according to the position of the right ear 62 with respect to the left speaker 31. Similarly, the transfer function a12 is set according to the position of the left ear 61 with respect to the right speaker 32, and the transfer function a22 is set according to the position of the right ear 62 with respect to the right speaker 32. The transfer functions a11, a12, a21, and a22 are, for example, functions of frequency.

The crosstalk cancellation calculation unit 20 sets transfer functions a11, a12, a21, and a22 that cancel the wraparound from the left speaker 31 to the right ear 62 and the wraparound from the right speaker 32 to the left ear 61. As the transfer functions a11, a12, a21, and a22, the influence reflected by the reflecting unit 40 is taken into consideration. That is, the transfer function is set so that the influence of the sound reflected by the reflecting unit 40 around the other ear is canceled.

The crosstalk cancellation calculation unit 20 is provided with

filters

21 and 22,

delay units

23 and 24,

inverters

25 and 26, and

adders

27 and 28. Here, the

filters

21 and 22 and the

delay units

23 and 24 have the following filter coefficients.

Filter 21: a11 / (a11 / a22-a12 / a21)
Filter 22: a22 / (a11 / a22-a12 / a21)
Delay device 23: a12 / a11
Delay device 24: a21 / a22

Accordingly, the speaker signals Lsp and Rsp are as follows.
Lsp = (Ls · a11−Rs · a21) / (a11 · a22−a12 · a21)
Rsp = (Rs.a22-Ls.a12) / (a11.a22-a12.a21)

The crosstalk cancellation calculation unit 20 calculates speaker signals Lsp and Rsp in which the crosstalk is canceled from the stereo signals Ls and Rs using a transfer function. As described above, the crosstalk cancellation calculation unit 20 performs processing for canceling sound crosstalk that occurs when the speaker signals Lsp and Rsp with localized sound images are output from the speaker unit 30.

Furthermore, as shown in FIG. 4B, when the sound field generation system 1 includes the sheet 110 and the sheet sensor 111, the crosstalk cancellation calculation unit 20 includes a transfer function change unit 29. The transfer function changing unit 29 receives a detection signal from the sheet sensor 111 and switches the transfer function according to the sheet position. Specifically, the transfer function changing unit 29 includes storage means such as a memory, and stores a plurality of transfer functions a11, a12, a21, and a22. Assuming that the four transfer functions a11, a12, a21, and a22 are one set, the transfer function changing unit 29 stores a plurality of sets of transfer functions and changes the transfer functions according to the sheet position. When the sheet sensor 111 detects a change in the sheet position, the transfer function changing unit 29 switches the transfer function, so that the crosstalk cancellation calculating unit 20 uses the switched transfer functions a11, a12, a21, and a22 to cross Perform talk cancel processing.

Hereinafter, an installation example in which the above-described sound field generation system 1 is installed will be described. In the following installation example, the interior of the automobile 100 is the installation environment of the sound field generation system 1. In addition, the reflection part 40 in the sound field generation system 1 is a vehicle body in the vehicle 100 or an in-vehicle device attached to the vehicle body, and is an object having a reflective surface. If it is a vehicle body, it may be a windshield, a side glass, a roof glass, a dashboard, a room mirror, or the like, and if it is an in-vehicle device, it may be a car navigation, a drive recorder, or the like. In addition, contents common to the following description of the plurality of installation examples will be omitted as appropriate.

Installation example 1.
An installation example 1 of the sound field generation system 1 will be described with reference to FIGS. 5 and 6A, 6B, and 6C. FIG. 5 is a diagram illustrating a state in which the sound field generation system 1 is installed, and is a diagram of the main part of the automobile 100 as viewed from above. In FIG. 5, the upper side of the page is the front of the automobile 100. 6A, 6B, and 6C are diagrams showing the arrangement of the speaker unit 30 and the reflection unit 40, and are views showing the installation state from the side. 6A, 6 B, and 6 C, the left side of the page is the front of the automobile 100. The automobile 100 is provided with a windshield 101, a right side glass 102, a left side glass 103, and a driver's seat 106. 5, 6 A, 6 B, and 6 C, a part of the configuration of the automobile 100 is omitted.

In this installation example 1, the left speaker 31 and the right speaker 32 are installed in a state where they are embedded in the dashboard 109, and the left speaker 31 and the right speaker 32 are installed side by side. Further, the windshield 101 of the automobile 100 serves as the reflecting section 40, and the left speaker 31 and the right speaker 32 radiate acoustic signals toward the windshield 101 serving as the reflecting section 40. Then, the acoustic signal reflected by the reflecting unit 40 reaches the listener 60 who has boarded the driver's seat 106. By adopting such an installation form, it is possible to prevent the influence of the shielding object such as the handle 105 due to the direct sound of the acoustic signal output from the speaker unit 30 and the influence of the right side glass 102 and the left side glass 103 due to other reflected sounds. Can do. Further, the driver's view is not obstructed by the installation of the speaker.

Further, as shown in FIGS. 6A, 6B, and 6C, it is preferable that the speaker unit 30 is arranged such that the output direction of the acoustic signal from the speaker unit 30 is directed upward. For example, the output direction of the acoustic signal from the speaker unit 30 is set vertically upward, and the speaker unit 30 is disposed immediately below a location where the windshield 101 is inclined 45 degrees from the vertical direction. By doing so, the acoustic signal reflected by the reflecting unit 40 propagates in the horizontal direction and reaches the listener 60. Furthermore, by making the position where the acoustic signal enters the reflecting portion 40 higher than the handle 105, it is possible to prevent sound shielding and reflection by the handle 105. Therefore, an appropriate sound image can be generated for the listener 60. As a form of the speaker unit 30, it can be installed as a part of the head-up display unit. In addition, the inclination angle of the reflection surface of the reflection unit 40 and the output direction of the acoustic signal from the speaker unit 30 are not particularly limited. The reflection surface of the reflection unit 40 may be a flat surface or a curved surface. The sound image localization calculation unit 10 and the crosstalk cancellation calculation unit 20 preferably perform calculations corresponding to the shape of the reflection surface of the reflection unit 40.

By installing in this way, the acoustic signal that is reflected by the reflecting portion 40 and reaches the listener 60 reaches the listener 60 without being affected by the shielding object such as the handle 105. Furthermore, since the sound reflected by the reflection unit 40 from the speaker unit 30 reaches the listener 60, it is possible to prevent the sound field from being disturbed by mixing other unnecessary reflection sounds. Therefore, an appropriate sound field can be generated at the position of the listener 60. The listener 60 is not limited to the driver, and may be a passenger who has boarded the passenger seat.

6B and 6C, the driver's seat 106 is the seat 110 in the configuration shown in FIG. 1B, and the transfer function changing unit 29 is detected when the seat sensor 111 detects a change in the seat position of the driver's seat 106. Changes the transfer function. For example, if the driver's seat 106 is slid in the direction of the arrow from the seat position shown in FIG. 6B, the seat position of the driver's seat 106 shifts backward as shown in FIG. The positional relationship between the part 30 and the reflecting part 40 changes. Accordingly, since the distance of the acoustic signal emitted from the speaker unit 30 reaching the left ear 61 and the right ear 62 of the listener 60 changes, the transfer functions a11, a12, a21, and a22 are switched to different sets. Thus, a sound field can be generated more appropriately by changing the transfer function according to the sound field generation environment. Note that the transfer function may be switched stepwise according to the sheet position or continuously. When the transfer function is switched in stages, the transfer function is the same up to a certain range where the seat position of the driver's seat 106 is, and when the range is exceeded, the transfer function is changed. When the transfer function is continuously switched, for example, the transfer function is a function having the coordinates of the sheet position as a variable.

Thus, when the position of the driver's seat 106 on which the listener 60 sits changes, the positional relationship between the left speaker 31, the right speaker 32, the left ear 61, and the right ear 62 changes. If an appropriate transfer function is prepared in advance according to the seat position and the transfer function changing unit 29 switches and uses the transfer function according to the seat position, a sound field can be generated more appropriately. In the above description, the listener 60 is the driver sitting in the driver's seat 106. However, the passenger sitting in the passenger seat or the rear seat may be the listener 60. In this case, the passenger seat or the seat in the rear seat may be used. The transfer function changing unit 29 changes the transfer function according to the position.

The method for detecting the sheet position is not particularly limited. For example, when the driver's seat 106 is an electric seat, the seat position can be detected by detecting the rotational speed and rotational speed of a motor or the like that moves the seat. When the driver's seat 106 is a manually moving seat, a position sensor that serves as the seat sensor 111 is provided in a guide mechanism or the like that guides the sliding movement of the seat. Of course, the transfer function changing unit 29 may switch the transfer function in accordance with not only the sliding movement of the seat in the front-rear direction but also the inclination position of the seat back portion.

Furthermore, it is also possible to measure a transfer function that takes into account the influence of the reflector 40 using a dummy head. In an environment where the sound field generation system 1 is actually installed or in substantially the same environment, a dummy head is arranged at the head position when the listener 60 is seated. The impulse response is measured for each of the left speaker 31 and the right speaker 32. That is, when an impulse signal is output from the left speaker 31 in a state where dummy heads with microphones provided on the left and right ears are arranged in the driver's seat 106, the impulse signals reflected by the left reflector 41 are converted to the left and right microphones of the dummy head. To reach. Similarly, the impulse response of the right speaker 32 is measured with the left and right microphones. Thus, a transfer function corresponding to the sound field generation environment can be obtained from the signal acquired by the microphone. In addition, by performing the same impulse response measurement by changing the seat position, an appropriate transfer function can be set according to the seat position, and even when there is a change in the sound field generation environment, it is more appropriate. A sound field can be generated.

By doing in this way, a transfer function in consideration of reflection by the reflection unit 40 can be obtained, and by using this transfer function, crosstalk can be canceled reliably. For this reason, a more appropriate sound field can be generated. In the interior of the automobile 100, a sound absorbing surface that absorbs sound and a reflecting surface that reflects sound are mixed, but the acoustic signal is delivered to the ear of the listener 60 via the reflecting portion 40 as in this installation example. Thus, the influence of other reflections in the sound field generation space can be reduced. Therefore, an appropriate sound field can be generated even in various environments.

Installation example 2.
Next, installation example 2 will be described with reference to FIG. FIG. 7 is a view showing a state in which the sound field generation system 1 is installed, and is a view of the automobile 100 as viewed from above. In the installation example 2, the description of the same configuration as the installation example 1 is omitted as appropriate. In the installation example 2, the left speaker 31 and the right speaker 32 are installed side by side on the dashboard 109. The right side glass 102 and the left side glass 103 are used as a right reflecting portion 42 and a left reflecting portion 41, respectively. For example, the right speaker 32 outputs an acoustic signal toward the right side glass 102, so that the right side glass 102, which is the right reflection unit 42, receives the acoustic signal from the right speaker 32 on the driver's seat 106. Reflected toward the right ear 62 of the camera. The left speaker 31 outputs an acoustic signal toward the left side glass 103, so that the left side glass 103, which is the left reflection unit 41, reflects the acoustic signal from the left speaker 31 toward the left ear 61 of the listener 60. To do. Furthermore, when the transfer function changing unit 29 is provided as in the configuration example of FIG. 4B, the transfer function changing unit 29 changes the transfer function according to the seat position of the driver's seat 106. By setting it as such an installation example, the effect similar to said installation example can be acquired.

Installation example 3.
Next, installation example 3 will be described with reference to FIG. FIG. 8 is a view showing a state in which the sound field generation system 1 is installed, and is a view of the automobile 100 as viewed from above. In the installation example 3, the description of the same configuration as in the installation example is omitted as appropriate. A roof glass 104 serving as a sunroof is provided on the ceiling of the automobile 100. The roof glass 104 is provided immediately above the driver's seat 106. In the installation example 3, the roof glass 104 is used as the reflecting portion 40. For example, the left speaker 31 and the right speaker 32 are installed side by side on the dashboard 109, and the left speaker 31 and the right speaker 32 output an acoustic signal toward the roof glass 104, thereby reflecting the reflection unit. The roof glass 104 that is 40 reflects the acoustic signals from the left speaker 31 and the right speaker 32 toward the left ear 61 and the right ear 62 of the listener 60 who has boarded the driver's seat 106. Furthermore, when the transfer function changing unit 29 is provided as in the configuration example of FIG. 4B, the transfer function changing unit 29 changes the transfer function according to the seat position of the driver's seat 106. By setting it as such an installation example, the effect similar to each said installation example can be acquired.

Installation example 4.
Next, installation example 4 will be described with reference to FIG. FIG. 9 is a view showing a state where the sound field generation system 1 is installed, and is a view of the automobile 100 as viewed from above. In the installation example 4, the description of the same configuration as the installation example is omitted as appropriate. A roof glass 104 serving as a sunroof is provided on the ceiling of the automobile 100. In the installation examples 1 to 3, the driver who has boarded the driver's seat 106 is the listener 60, but in this installation example 4, the passenger who has boarded the rear seat 107 is the listener 60. In the installation example 4, the roof glass 104 is used as the reflecting portion 40. For example, the left speaker 31 and the right speaker 32 are installed side by side on the dashboard 109, and the left speaker 31 and the right speaker 32 output acoustic signals toward the roof glass 104. The roof glass 104 serving as the reflection unit 40 reflects the acoustic signals from the left speaker 31 and the right speaker 32 toward the left ear 61 and the right ear 62 of the listener 60. Further, when the transfer function changing unit 29 is provided as in the configuration example of FIG. 4B, the transfer function changing unit 29 changes the transfer function according to the seat position of the rear seat 107. By setting it as such an installation example, the effect similar to each said installation example can be acquired.

Installation example 5.
Next, installation example 5 will be described with reference to FIG. FIG. 10 is a diagram illustrating a state in which the sound field generation system 1 is installed, and is a diagram of the automobile 100 as viewed from above. In the installation example 5, the description of the same configuration as the installation example is omitted as appropriate. In the present installation example 5, as in the installation examples 1 to 3, the driver who has boarded the driver's seat 106 is the listener 60. In the installation example 5, the left speaker 31 and the right speaker 32 are installed side by side on the dashboard 109, and the front glass 101 and the right side glass 102 are used as the reflecting portion 40. The left speaker 31 outputs an acoustic signal toward the windshield 101, so that the windshield 101 as the reflection unit 40 reflects the acoustic signal from the left speaker 31 toward the left ear 61 of the listener 60. . The right speaker 32 outputs an acoustic signal toward the right side glass 102, so that the right side glass 102, which is the reflection unit 40, transmits the acoustic signal from the right speaker 32 to the right ear of the listener 60 who has boarded the driver's seat 106. Reflects toward 62. Furthermore, when the transfer function changing unit 29 is provided as in the configuration example of FIG. 4B, the transfer function changing unit 29 changes the transfer function according to the seat position of the driver's seat 106. By setting it as such an installation example, the effect similar to each said installation example can be acquired.

In this installation example, the front glass 101 is used as the reflecting portion 40 for one ear (here, the left ear 61), and the side glass is used as the reflecting portion 40 for the other ear (here, the right ear 62). In particular, it is preferable that the side glass is the reflecting portion 40 in the ear closer to the side glass (right ear 62), and the windshield 101 is the reflecting portion 40 in the ear far from the side glass (left ear 61). . Thereby, the influence of a direct sound can be reduced. Of course, in the case of a left-hand drive vehicle, the left and right are reversed. That is, in the case of a left-hand drive vehicle, the left side glass 103 is the left reflecting portion 41 and the windshield 101 is the right reflecting portion 42. Alternatively, when the passenger on the passenger seat is the listener 60, the left side glass 103 is the left reflecting portion 41 and the windshield 101 is the right reflecting portion 42. Of course, for one ear, as shown in the installation example 3, the roof glass 104 may be used as the reflecting portion 40 instead of the windshield 101.

Installation example 6.
Next, installation example 6 will be described with reference to FIG. FIG. 11 is a view showing a state in which the sound field generation system 1 is installed, and is a view of the automobile 100 as viewed from above. In the installation example 6, the description of the same configuration as the installation example is omitted as appropriate. In the installation example 6, the left speaker 31 and the right speaker 32 are installed side by side on the dashboard 109. As a specific example, the left speaker 31 is disposed on the front side, that is, the back side of the dashboard 109, the right speaker 32 is disposed on the rear side, that is, the front side of the dashboard 109, and the right side glass 102 is used as the reflecting portion 40. Yes. The right speaker 32 outputs an acoustic signal toward the right side glass 102, whereby the right side glass 102, which is the right reflection unit 42, transmits the acoustic signal from the right speaker 32 to the right of the listener 60 who has boarded the driver's seat 106. Reflected toward the ear 62. The left speaker 31 outputs an acoustic signal toward the right side glass 102, so that the right side glass 102, which is the left reflection unit 41, reflects the acoustic signal from the left speaker 31 toward the left ear 61 of the listener 60. To do. Furthermore, when the transfer function changing unit 29 is provided as in the configuration example of FIG. 4B, the transfer function changing unit 29 changes the transfer function according to the seat position of the driver's seat 106. By setting it as such an installation example, the effect similar to each said installation example can be acquired.

Installation example 7.
Next, installation example 7 will be described with reference to FIGS. 12, 13A, and 13B. FIG. 12 is a perspective view showing the left speaker 31 and the left reflecting portion 41. 13A and 13B are views showing a state in which the sound field generation system 1 is installed, and are views of the automobile 100 as viewed from above. In the present installation example 7, various glasses of the automobile 100 are not used as the reflection unit 40, and the reflection unit 40 is separately installed on the dashboard 109. As shown in FIG. 12, the reflection unit 40 has a variable angle of the reflection surface of the left reflection unit 41. By adjusting the attachment angle of the left reflection unit 41, the acoustic signal output from the left speaker 31 is adjusted. The reflection direction can be changed. Similarly, the angle of the reflecting surface of the right reflecting portion 42 is variable. Furthermore, when the transfer function changing unit 29 is provided as in the configuration example of FIG. 4B, the transfer function changing unit 29 switches the transfer function when the angle of the reflecting surface of the reflecting unit 40 is changed.

In the installation example 7, the speaker unit 30 and the reflection unit 40 are installed on the dashboard 109 as shown in FIGS. 13A and 13B. The left reflection unit 41 is disposed in front of the left speaker 31, the right reflection unit 42 is disposed in front of the right speaker 32, and the reflection angles of the left reflection unit 41 and the right reflection unit 42 are variable. Yes. In the example shown in FIG. 13A, the listener 60 is a passenger on the passenger seat 108, and the listener 60 is a driver on the driver's seat 106 in FIG. 13B. In addition, although the reflection angle of the left reflection part 41 and the right reflection part 42 is good also as variable integrally, in order to produce | generate a more suitable sound field, it is preferable to make it variable independently. Further, the reflection angle may be variable in all of the vertical direction, the horizontal direction, and the front-rear direction, or may be variable only in an arbitrary direction.

In this installation example, the listener 60 can be switched by adjusting the reflection angle of the reflector 40. That is, in FIG. 13A, the listener 60 is a passenger who has boarded the passenger seat 108. However, by changing the reflection angle of the speaker unit 30 from the state shown in FIG. 13A, the reflected sound as shown in FIG. Can reach the driver of the driver's seat 106. The reflection angle can be adjusted automatically using a drive mechanism such as a motor. In this case, a reflection angle suitable for each listener 60 may be set in advance, and a motor or the like may be driven to change the listener 60 to a preset reflection angle. Of course, the passenger may manually change the reflection angle of the reflector 40. By doing in this way, since a reflection angle can be adjusted according to a passenger, more suitable sound field production | generation is attained with respect to each listener 60. FIG. Further, the reflection surface of the reflection unit 40 may be a flat surface or a curved surface.

By setting it as such an example, since the influence of obstructions, such as the handle | steering-wheel 105, can be reduced and it can prevent that the direct sound from the speaker part 30 reaches the listener 60, it is in the reflection part 40. By mixing the direct sound that reaches the listener 60 without being reflected and the reflected sound that is reflected by the reflector 40 and reaches the listener 60, it is possible to prevent the sound field from being disturbed. Therefore, a sound field can be generated appropriately. Further, since the listener 60 can be switched, an appropriate sound field can be generated for the switched listener 60. When the transfer function changing unit 29 is provided as in the configuration example of FIG. 4B, when the listener 60 is switched, the transfer function changing unit 29 changes the transfer function. An appropriate sound field can be generated. Further, when the listener 60 is the passenger seat 108, the transfer function is changed according to the seat position of the passenger seat 108, and when the listener 60 is the driver seat 106, the transfer function is changed according to the seat position of the driver seat 106. By doing so, a sound field can be generated more appropriately.

In the above description, the angle of the reflection surface of the reflection unit 40 is changed. However, the same effect can be obtained even if the angle of the acoustic radiation surface of the speaker unit 30 is changed. Furthermore, when changing the angle of the acoustic radiation surface of the speaker unit 30, the right side glass 102, the left side glass 103, the front glass 101, and the roof glass 104 can be used as the reflection unit 40 as shown in the installation examples 1 to 6. .

Installation example 8.
Next, installation example 8 will be described with reference to FIG. FIG. 14 is a diagram showing the left speaker 31, the right speaker 32, the left reflection unit 41, and the right reflection unit 42 in which the sound field generation system 1 is installed. In this installation example, the left speaker 31, the right speaker 32, the left reflecting portion 41, and the right reflecting portion 42 are embedded in the dashboard 109. That is, the dashboard 109 is provided with two embeddings, and the left speaker 31 and the left reflecting portion 41 are integrally disposed in one embedding, and the right speaker 32 and the right reflecting portion 42 are disposed in the other embedding. Arranged integrally. Therefore, the wall of the embedded portion provided in the dashboard 109 functions as the left reflecting portion 41 and the right reflecting portion 42. In other words, in this installation example, the windshield 101, the right side glass 102, the left side glass 103, and the roof glass 104 are not used as the reflecting portion 40. By doing in this way, the sound field production | generation apparatus 2 can be installed easily. Of course, the left speaker 31, the right speaker 32, the left reflection unit 41, and the right reflection unit 42 may all be disposed in one embedding.

Furthermore, in this installation example 8, in order to make the passenger 60 of the passenger seat 108 the listener 60, the directions of the left speaker 31 and the right speaker 32 are made variable. That is, when the listener 60 is switched from the driver to the passenger, the output directions of the left speaker 31 and the right speaker 32 are changed. In this way, by changing the direction of the sound radiation surface with respect to the left speaker 31 and the right speaker 32, the radiation angle of the reflection unit 40 with respect to the reflection surface can be adjusted, and the same effect as in the installation example 7 can be obtained. Can do. Of course, not only the left speaker 31 and the right speaker 32 but also the directions of the left reflecting portion 41 and the right reflecting portion 42 may be further variable. That is, the listener 60 can be switched by changing the orientation of at least one of the speaker unit 30 and the reflection unit 40.

FIG. 15 shows a state where the configuration shown in FIG. FIG. 15 is a diagram illustrating a state in which the sound field generation system 1 is installed, and is a diagram of the automobile 100 as viewed from above. In the example shown in FIG. 15, the installation angle of the speaker unit 30 is variable. Thereby, the angle with respect to the acoustic radiation | emission surface of the left speaker 31 and the right speaker 32 can be changed. That is, by adjusting the mounting angle between the left speaker 31 and the right speaker 32, the output direction of the acoustic signals from the left speaker 31 and the right speaker 32 can be changed, and the acoustic signals reach via the reflector 40. The arrival position to be changed can be changed. Note that the angles of the acoustic radiation surfaces of the left speaker 31 and the right speaker 32 may be adjusted independently.

By changing the direction of the left speaker 31 and the right speaker 32 and changing the output direction of the left speaker 31 and the right speaker 32 according to the seat position, an acoustic signal is output in an optimum direction even when the seat position changes. can do. Further, when the transfer function changing unit 29 is provided as in the configuration example of FIG. 4B, the transfer function changing unit 29 switches the transfer function when the seat position is changed, so that the sound field can be generated more appropriately. it can. Of course, in this case as well, not only the left speaker 31 and the right speaker 32 but also the directions of the left reflecting portion 41 and the right reflecting portion 42 may be further variable. That is, if the direction of at least one of the speaker unit 30 and the reflection unit 40 is made variable, the output direction of the acoustic signal can be changed according to the seat position.

Installation example 9.
Next, installation example 9 will be described with reference to FIG. FIG. 16 is a diagram showing the left speaker 31, the right speaker 32, the car navigation body 117, and the car navigation display surface 118 in which the sound field generation system 1 is installed. In this installation example, the left speaker 31, the right speaker 32, and the car navigation body 117 are embedded in the dashboard 109. That is, the dashboard 109 is provided with three embeddings, one is used for embedding the car navigation body 117, and the other two are present behind the car navigation display surface 118, and the left speaker 31. And used for embedding the right speaker 32. Then, the acoustic signal of the left speaker 31 is reflected toward the left ear 61 of the listener 60 with the car navigation display surface 118 as a reflecting surface. Similarly, the sound signal of the right speaker 32 is reflected toward the right ear 62 of the listener 60 with the car navigation display surface 118 as a reflection surface. Furthermore, when the transfer function changing unit 29 is provided as in the configuration example of FIG. 4B, the transfer function changing unit 29 switches to the transfer function using the car navigation display surface 118, and thus generates a sound field more appropriately. can do. By setting it as such an installation example, the effect similar to said installation example can be acquired.

Further, as shown in FIG. 17, the speaker unit 30 is embedded in a space located behind the car navigation display surface 118. The speaker unit 30 is installed with a speaker angle such that an acoustic signal output from the speaker unit 30 reaches the listener 60 with the car navigation display surface 118 as a reflecting surface.

(Embodiment 2)
In this embodiment, stereo signals Ls and Rs based on binaurally recorded sound sources are used as input signals. The sound field generation system 1 according to the second exemplary embodiment has a configuration as illustrated in FIGS. 18A, 18B, and 19. Compared to the configuration of the first embodiment, the sound image localization calculation unit 10 is omitted. In other words, the stereo signals Ls and Rs in which the sound image is localized are directly input to the crosstalk cancellation calculation unit 20. In the recording site as shown in FIG. 20, the sound signal from the real sound source P (t) is recorded by the microphones 73 of the left ear 71 and the right ear 72 provided in the dummy head 70. By doing so, stereo signals Ls and Rs to which a transfer function from the real sound source P (t) to the dummy head 70 is added can be obtained. Therefore, the sound image is localized with the position of the real sound source P (t) 74 relative to the dummy head 70 as the virtual sound source p ′ (t). Therefore, regardless of the position of the real sound source P (t) 74, the sound image can be localized for the listener 60 as the virtual sound source p ′ (t) corresponding to that position. Further, as shown in FIG. 18B, the sound field generation system 1 may include a sheet 110 and a sheet sensor 111 in addition to the structure of FIG. 18A. In this case, as in the first embodiment, the crosstalk cancellation calculation unit 20 changes the transfer function according to the detection result of the sheet sensor 111. Since other processes and installation examples are the same as those in the first embodiment, description thereof is omitted. Even if it is such a structure, the effect similar to said Embodiment 1 can be acquired.

(Embodiment 3)
In the sound field generation system 1 according to the present embodiment, the speaker unit 30 and the reflection unit 40 are integrated. Therefore, as shown in FIG. 21, a speaker unit 90 in which the speaker 30 and the reflector 40 are integrated is provided. FIG. 21 is a block diagram showing a partial configuration of the sound field generating device 2. Specifically, a left speaker unit in which the left speaker 31 and the left reflection unit 41 are integrated, and a right speaker unit in which the right speaker 32 and the right reflection unit 42 are integrated are provided. The left speaker unit and the right speaker unit have the same configuration. In the present embodiment, the reflection unit 40 is a part of the sound field generation device 2. Since other configurations are the same as those in the first and second embodiments, description thereof is omitted.

The configuration of one speaker unit provided in the speaker unit 90 will be described with reference to FIGS. 22 and 23 are perspective views showing a configuration example of the left speaker unit 91, and FIG. 24 is a perspective view showing another example of a configuration for changing the angle of the left reflection unit 41. FIG. 25 is a diagram schematically showing how the angle of the left speaker 31 is changed. In addition, since the left speaker unit and the right speaker unit have the same configuration, description regarding the right speaker unit is omitted.

22 and 23, in the left speaker unit 91, the left speaker 31 is housed in a box-shaped case 93, and the lid 94 of the case 93 serves as the left reflecting portion 41. That is, when the acoustic signal output upward from the left speaker 31 is incident on the lid 94 disposed obliquely, the lid 94 reflects the acoustic signal toward the listener 60. Furthermore, since the lid 94 is provided so that the opening / closing angle can be changed, the reflection direction can be changed by changing the angle of the lid 94. Furthermore, as shown in FIG. 25, the installation angle of the left speaker unit 91 itself with respect to the left reflecting portion 41 can be rotated, and the listener 60 can be moved from the driver to the passenger seat 108 in the same manner as in the installation examples 7 and 8. You can switch to a passenger. Alternatively, the listener 60 may be switched from the driver to a passenger on the rear seat 107.

As another example, as shown in FIG. 24, a groove 95 is provided around the left speaker 31, and the same effect can be obtained by rotating the lid 94, which is the left reflecting portion 41, around the groove 95. Obtainable. As shown in the present embodiment, by changing the angle of at least one of the reflection unit 40 and the speaker unit 30, for example, the left speaker 31 and the right speaker 32 are relative to the reflection surfaces of the left reflection unit 41 and the right reflection unit 42. By making the angle variable, the same effects as those of the installation examples 7 and 8 can be obtained.

In each of the above embodiments, a transfer function measured according to the actual sound field generation environment may be used. In this case, the transfer function is set in the sound field generation environment where the actual sound field generation system 1 is installed or in the same sound field generation environment. When the sound field generation environment is in the vehicle 100, the sound field generation system 1 is installed in the vehicle 100. And the transfer function according to the angle of the reflective surface of the reflective part 40 and the angle of the sound emission surface of the speaker part 30 is set. For example, as shown in FIG. 26, a dummy head 70 is disposed in the driver's seat 106 of the automobile 100, and impulse response measurement is performed to obtain the transfer functions a11, a12, a21, and a22 shown in FIGS. 4A and 4B. Thereby, since the listener 60 sits at the position measured using the dummy head 70, it is possible to generate a sound field more appropriately. Of course, the transfer function may be changed according to the angle of the acoustic radiation surface of the speaker unit 30 and the direction of the reflection surface of the reflection unit 40. When the listener 60 is switched, the sound field can be generated more appropriately by changing the transfer function to be used.

(Embodiment 4)
The sound field generation system 1 according to the present embodiment will be described with reference to FIGS. FIG. 27 is a block diagram showing a configuration of the sound field generation system 1. FIG. 28 is a top view showing a state in which the sound field generation system 1 is installed in the automobile 100. In the present embodiment, the sound field generation system 1 includes a boarding sensor 112 that detects the presence or absence of a passenger on each seat 110. The crosstalk cancellation calculation unit 20 changes the transfer function according to the detection result of the boarding sensor 112. Specifically, the boarding sensor 112 is provided in the driver's seat 106, the rear seat 107, the passenger seat 108, and the like, and the crosstalk cancellation calculation unit 20 is detected by detecting whether or not the passenger has boarded for each seat. Switches the transfer function according to the layout of the passenger.

For example, in a state where only the driver is on board and when the driver and the passenger are on board, sound reflection and absorption occur by the passenger, so the sound field generation environment changes. For example, when a passenger rides on the passenger seat 108, the acoustic signal reflected by the reflecting portion 40 is shielded or reflected by the passenger, so that the passenger is not on the rear seat 107 and the passenger seat 108. The optimal transfer function differs depending on whether only the rear seat 107, only the passenger seat 108, or both the rear seat 107 and the passenger seat 108 are used. In the crosstalk cancellation calculation unit 20, an optimal transfer function corresponding to the presence or absence of a passenger on each seat 110 is set in advance. When the boarding sensor 112 determines which seat 110 the passenger is sitting on, the crosstalk cancellation calculation unit 20 switches the transfer function according to the number of passengers detected by the boarding sensor 112.

For example, the boarding sensor 112 is a sensor that detects whether or not a seat belt of each seat 110 is attached, and a passenger is seated on the seat while the seat belt provided on each seat 110 is attached. It is determined that the passenger is not seated on the seat in a state where the seat belt is not worn. The boarding sensor 112 may be a force sensor, a contact sensor, or the like that senses that the passenger has got on the seat 110, and the presence or absence of the passenger may be detected for each seat by the force applied by the boarding sensor 112 to the seat 110. Alternatively, the boarding sensor 112 may be a camera that captures the interior of the automobile 100, and it may be determined whether or not a passenger is sitting on each seat 110 from the interior image captured by the camera. In this way, the boarding sensor 112 detects on which seat of the plurality of seats 110 a person is sitting, and the crosstalk cancellation computing unit 20 switches the transfer function according to the detection result of the boarding sensor 112. Thus, the transfer function can be optimized, and a sound field can be generated more appropriately.

(Embodiment 5)
The sound field generation system 1 according to the present embodiment will be described with reference to FIGS. 29 and 30. FIG. FIG. 29 is a block diagram showing a flow in the sound field generation system 1. FIG. 30 is a diagram schematically illustrating the overall configuration of the sound field generation system 1. In the present embodiment, a lens unit 50 is provided in addition to the configuration of the first embodiment. The lens unit 50 is an acoustic lens for focusing the acoustic signal output from the speaker unit 30, and the acoustic signal focused by the lens unit 50 is reflected by the reflection unit 40. Since the configuration other than the lens unit 50 is the same as that of the above embodiment, the description thereof is omitted.

The lens unit 50 includes a left lens 51 and a right lens 52 as shown in FIG. The acoustic signal output from the left speaker 31 reaches the left lens 51, and the left lens 51 focuses the acoustic signal from the left speaker 31 on the reflecting surface of the left reflecting portion 41. Then, the acoustic signal reflected by the left reflection unit 41 reaches the left ear 61 of the listener 60. The acoustic signal output from the right speaker 32 reaches the right lens 52, and the right lens 52 focuses the acoustic signal from the right speaker 32 on the reflection surface of the right reflection unit 42. Then, the acoustic signal reflected by the right reflecting unit 42 reaches the right ear 62 of the listener 60. As the acoustic lens used for the left lens 51 and the right lens 52, for example, those described in JP-A-5-344580 can be used. By disposing such an acoustic lens between the reflection unit 40 and the speaker unit 30, reflections other than the reflection unit 40 can be prevented, and more appropriate sound field generation can be performed.

(Embodiment 6)
A sound field generation system 1 and a sound field generation method according to the present embodiment will be described with reference to FIGS. 31 and 32. FIG. FIG. 31 is a block diagram showing a flow in the sound field generation system 1. FIG. 32 is a diagram schematically illustrating the overall configuration of the sound field generation system 1. In the present embodiment, in addition to the configuration of the second embodiment, a lens unit 50 is provided. The lens unit 50 is similar to the lens unit 50 of the fifth embodiment, and focuses the acoustic signal output from the speaker unit 30. The acoustic signal focused by the lens unit 50 is reflected by the reflecting unit 40. In addition, since it is the same as that of said Embodiment 2, 5 about structures other than the lens part 50, description is abbreviate | omitted. Even if it is such a structure, the effect similar to Embodiment 5 can be acquired.

In the fifth and sixth embodiments, the lens unit 50 may be formed integrally with the speaker unit 30 and the reflection unit 40. That is, as shown in FIG. 33, the lens unit 50, the speaker unit 30, and the reflection unit 40 can be formed integrally to form the speaker unit 90. Of course, the left and right speaker units may be separate. In this case, for example, in the left speaker unit 91 as shown in FIGS. 22 and 23, an acoustic lens is disposed between the left speaker 31 and the left reflecting portion 41 to form the left lens 51. By doing so, it is possible to form the left speaker unit 91 in which the left lens 51, the left speaker 31, and the left reflecting portion 41 are integrated. The left speaker unit 91 is arranged on the dashboard 109 or the like. Of course, the right speaker unit can have the same configuration.

It should be noted that the installation position of the speaker may be asymmetric according to the reflection unit 40. That is, as viewed from the listener 60, the speakers of each channel do not need to be frontal and symmetrical, and the speaker of the other channel may be placed at a position shifted from front to back and left and right with respect to the speaker of one channel. good. For example, as shown in FIG. 34, the left speaker 31 and the right speaker 32 can be arranged at asymmetric positions. Here, assuming that the center line S in the left-right direction passing through the center of the listener 60 is the center line S, the spread angle θ1 from the center line S to the right speaker 32 is larger than the spread angle θ2 from the center line S to the left speaker 31. It is getting smaller. In other words, the distance to the center line S differs between the left and right speakers. Further, also in the front-rear direction, the distance from the listener 60 to the left speaker 31 is larger than the distance from the listener 60 to the right speaker 32.

Alternatively, as shown in FIG. 35, the vertical position may be different. Even if the distance from the left ear 61 of the listener 60 to the left speaker 31 and the distance from the right ear 62 of the listener 60 to the right speaker 32 are different in at least one of the vertical direction, the horizontal direction, and the front-back direction. Good.

(Embodiment 7)
The sound field generation system 1 according to the present embodiment will be described with reference to FIG. FIG. 36 is a block diagram showing a configuration of the sound field generation system 1. The sound field generation system 1 according to the present embodiment includes a window sensor 115 that detects the opening / closing position of the window 114. The crosstalk cancellation calculation unit 20 has the transfer function changing unit 29 shown in FIG. 4B and changes the transfer function according to the detection result of the window sensor 115. As the window 114 in the sound field generation environment opens and closes, the propagation direction of the acoustic signal changes. For example, if there is glass in the window 114 at the position where the acoustic signal is incident, the acoustic signal is reflected. If there is no glass in the window 114, the acoustic signal is not reflected. The field generation environment changes. The crosstalk cancellation calculation unit 20 cancels the crosstalk using an optimal transfer function corresponding to the opening / closing position of the window 114.

Here, if the right side glass 102 and the left side glass 103 shown in FIGS. 7 and 8 are used as the window 114, the window 114 is opened and closed by moving the right side glass 102 and the left side glass 103 up and down. The sound field generation environment changes. Or if the roof glass 104 is used as the window 114, even if the roof glass 104 moves back and forth, the window 114 opens and closes, and the sound field generation environment changes. A more appropriate sound field can be generated by changing the transfer function according to the opening / closing position of the right side glass 102, the left side glass 103, the roof glass 104, or the like. The transfer function may be changed stepwise or continuously depending on the opening / closing position of the window 114. Furthermore, not only the window 114 but also the transfer function may be changed according to the opening / closing position of a door provided in the sound field generation environment.

As described above, in the embodiments including the transfer function changing unit 29 in each of the above embodiments, the transfer function is changed according to the sound field generation environment. When the sound field generation environment changes, the transfer characteristics from the left and right speakers to the left and right ears change, so that the crosstalk can be canceled using the optimum transfer function by changing the transfer function. Therefore, a sound field can be generated appropriately even in various sound field generation environments. The transfer function corresponding to the sound field generation environment is obtained by impulse response measurement in a sound field generation environment that is substantially the same as the actual sound field generation environment. For example, an impulse response measurement is performed by placing a dummy head in a sound field generation environment that is substantially the same as the actual sound field generation environment. That is, the impulse response is measured by changing the sound field generation environment such as a state where a passenger is on board or a state where the window 114 is opened. By doing so, the transfer functions a11, a12, a21, and a22 shown in FIG. 4B and the like can be optimized.

(Embodiment 8)
The sound field generation system 1 according to the present embodiment will be described with reference to FIGS. 37 is a block diagram showing a configuration of the sound field generation system 1, FIGS. 38 and 39 are top views showing the automobile 100 in which the sound field generation system 1 is installed, and FIG. 40 is an installation of the sound field generation system 1. FIG. The sound field generation system 1 according to the present embodiment has an angle changing unit 116 that changes the angle of the speaker unit 30 in addition to the configuration of the seventh embodiment. When the angle changing unit 116 includes a motor for adjusting the angle of the speaker unit 30 and the window 114 is opened from a certain opening / closing position, an acoustic signal from the speaker unit 30 is directly delivered to the listener 60. The angle of the speaker unit 30 is changed so that the speaker unit 30 can be delivered to the listener 60 via the reflecting unit 40 in a closed state from a certain opening / closing position. Other configurations and processes are the same as those in the above-described embodiments, and thus description thereof is omitted.

As shown in FIG. 38, when the right side glass 102 is closed, the acoustic signal from the right speaker 32 is reflected by the right side glass 102 and reaches the right ear 62, and the acoustic signal from the left speaker 31 directly reaches the left ear 61. ing. As shown in FIG. 39, if the listener 60 sitting on the driver's seat 106 has lowered the right side glass 102 of the window 114, the position where the acoustic signal from the right speaker 32 is incident (see the dotted line arrow in FIG. 39). Since the right side glass 102 is lower than the right side glass 102, the right side glass 102 does not function as the right reflecting portion 42, and an acoustic signal hardly reaches the right ear 62. Therefore, in the present embodiment, the right speaker 32 changes the direction of the sound emission surface so that the sound signal from the right speaker 32 reaches the right ear 62 directly. Or you may make it the left side glass 103 other than the right side glass 102, the windshield 101, or the roof glass 104 grade | etc., Serve as the right reflection part 42. FIG.

Depending on the position of the right side glass 102 provided in the window 114, the speaker unit 30 changes the direction of the acoustic radiation surface so that the acoustic signal from the speaker unit 30 reaches the listener 60 directly, or the reflection unit 40 Whether to reflect and reach the listener 60 can be selected. In addition, as shown in FIG. 40, when the right side glass 102 falls below the height of the ear (dotted line position in FIG. 40), the speaker unit 30 changes the direction of the sound emitting surface, and the sound signal is received by the listener 60. By directly delivering to the sound field, the sound field can be generated more appropriately even when the sound field generation environment changes. In particular, when the right speaker 32 changes the direction of the sound emitting surface according to the open / close position of the side glass closer to the listener 60 (the right side glass 102 in FIGS. 38 to 40), the sound field is generated more appropriately. be able to.

Note that the direction of the acoustic radiation surface of the right speaker 32 is set in advance for each of the case where the acoustic signal is delivered directly and the case where the acoustic signal is delivered via the right reflector 42, and the right side glass 102 exceeds a predetermined height. The right speaker 32 changes the direction of the acoustic radiation surface. Of course, when the automobile 100 is a left-hand drive vehicle, the direction of the left speaker 31 changes depending on the position of the left side glass 103. The angle changing unit 116 may change the direction of the speaker unit 30 according to the opening / closing positions of the side glasses on both sides as well as the one side glass. Furthermore, as shown in the installation example 8, the crosstalk cancellation calculation unit 20 changes the transfer function according to the angle of the speaker unit 30. When the angle of the right speaker 32 is changed, the crosstalk cancellation calculation unit 20 switches the transfer function, so that an optimal sound field can be generated according to a change in the sound field generation environment.

(Embodiment 9)
The sound field generation device 2 and the sound field generation system 1 according to the present embodiment will be described with reference to FIGS. 41 and 42. 41 and 42 are top views showing an example in which the sound field generation system 1 is installed in the automobile 100. FIG. Since the sound field generation system 1 according to the present embodiment has the same configuration as that of FIG. 37 according to the eighth embodiment, the description of the same contents is omitted.

In the present embodiment, as shown in FIG. 41, when the roof glass 104 is in the closed state, the roof glass 104 serves as the reflecting portion 40. When the listener 60 opens the roof glass 104 and the roof glass 104 moves behind the position where the acoustic signal reaches (for example, the position indicated by the dotted line in FIG. 42), the roof glass 104 functions as the reflecting portion 40. Therefore, the angle changing unit 116 changes the direction of the speaker unit 30. Thereby, as shown in FIG. 42, since the acoustic signal from the speaker unit 30 is directly delivered to the listener 60, the same effect as in the eighth embodiment can be obtained. Alternatively, the left side glass 103, the front glass 101, the right side glass 102, etc. other than the roof glass 104 may be used as the reflecting portion 40.

It should be noted that the installation position of the speaker may be asymmetric according to the reflection unit 40. That is, as viewed from the listener 60, the speakers of each channel do not need to be frontal and symmetrical, and the speaker of the other channel may be placed at a position shifted from front to back and left and right with respect to the speaker of one channel. good. For example, as shown in FIG. 34 shown in the sixth embodiment, the left speaker 31 and the right speaker 32 can be arranged at positions that are asymmetrical to the left and right. Here, assuming that the center line S in the left-right direction passing through the center of the listener 60 is the center line S, the spread angle θ1 from the center line S to the right speaker 32 is larger than the spread angle θ2 from the center line S to the left speaker 31. It is getting smaller. In other words, the distance to the center line S differs between the left and right speakers. Furthermore, also in the front-rear direction, the distance from the listener 60 to the left speaker 31 is larger than the distance from the listener 60 to the right speaker 32.

Or as shown in FIG. 35 shown in Embodiment 6, the position of an up-down direction may differ. Even if the distance from the left ear 61 of the listener 60 to the left speaker 31 and the distance from the right ear 62 of the listener 60 to the right speaker 32 are different in at least one of the vertical direction, the horizontal direction, and the front-back direction. Good.

(Embodiment 10)
The sound field generation system 3 according to the tenth embodiment will be described with reference to FIGS. 43A, 43B, and 44. FIG. 43A and 43B are block diagrams showing the configuration of the sound field generation system 3 according to the tenth embodiment. FIG. 44 is a diagram schematically showing the overall configuration of the sound field generation system 3. Compared to the configuration of the first embodiment, a whispering voice conversion unit 75 is added. The whispering voice conversion unit 75 converts a normal voice into a whispering voice. Specifically, the normal voice, which is a voiced sound, is made unvoiced. As this method, a method of controlling the noise waveform and the amplitude of a periodic sound source waveform disclosed in Japanese Patent Laid-Open No. 58-168098, or Japanese Patent Laid-Open No. 2008- A method of obtaining a transfer function of the vocal tract using the linear prediction method of No. 139573 and multiplying the white noise by using the amplitude ratio with the residual signal subtracted from the original sound waveform, and removing the formant component of Japanese Patent Laid-Open No. 2006-234969 And other feature conversion methods (eg, A. Kain and MWMacon, “Spectral voice conversion for text-”) for converting feature quantities such as spectral series based on a Gaussian Mixture Model (GMM). to-speechsynthesis "Proc.ICASSP, pp.285-288, Seattle, USA May, 1998.), and any known method can be used.

The voice signal converted into the whisper is input to the sound image localization calculation unit 10 and a convolution calculation is performed. In the present embodiment, since it is provided to the listener's right ear, the transfer function bl (t) of the convolution calculation unit 11 and the transfer function br (t) of the convolution calculation unit 12 are Although the transfer function when the sound source is placed at the ear is used, in order to make the calculation process simpler, the transfer function bl (t) of the convolution calculation unit 11 may be set as the following expression (1). .
bl (t) = 0 Formula (1)
The transfer function br (t) of the convolution calculator 12 may be set as shown in the following equation (2).
br (t) = A (t = t1) A is a constant (amplitude), t1 is a predetermined value of t1 ≧ 0 br (t) = 0 (t ≠ t1) (2)
In addition, when providing to a left ear | edge, the value of said transfer function is reverse on right and left.
The procedure after the crosstalk cancellation calculation is the same as in the first embodiment. In the case of FIG. 43B, the crosstalk cancellation calculation unit 20 changes the transfer function according to the position of the seat 110 on which the listener 60 sits, and according to the relative positions of the speaker unit 30, the reflection unit 40, and the listener 60. Crosstalk is canceled by the transfer function. Thereby, a transfer function can be optimized and a sound field can be generated more appropriately.

In this embodiment, the voice is whispered and localized at the ear, so the voice can be heard at the listener's ear, and even if there is a sound that can be heard from the surroundings such as road noise or car stereo, the clarity is high. I can hear the voice. Also, whispering voices are unvoiced sounds and contain many high frequencies. For those who are not listeners (for example, those who are seated in the front passenger seat if the listener is a driver), it is masked by road noise and car stereo sound because it is far away from the speaker being played. It ’s hard to hear. Therefore, there is an effect that the sound necessary for the listener can be provided only to the listener.

In this embodiment, sound image localization calculation is performed after whispering voice conversion, but it goes without saying that the same effect can be obtained even if the audio signals Ls and Rs after sound image localization calculation are input to the whispering voice conversion unit. For example, if a voice signal (binaural signal) localized at the ear as a virtual sound source in advance with normal voice is converted into a whisper by the whisper voice conversion unit, the whisper is provided to the ear and becomes easier to hear.

In the description of each of the above embodiments, the sound field generation system 1 and the sound field generation system 3 are in-vehicle devices, and the sound field generation environment in which the sound field generation system 1 and the sound field generation system 3 are installed is the automobile 100. Although the example of the inside of the vehicle has been described, the installation location is not limited to this. Further, the reflection unit 40 in the sound field generation system 1 and the sound field generation system 3 may be other than the vehicle body in the automobile 100 or the in-vehicle device.

It is also possible to create a sound field generation environment using a hood such as a motorcycle or bicycle as a reflection part. Furthermore, it is preferable to mount the sound field generation system 1 or the sound field generation system 3 in a sound field generation environment that is a closed space. For example, it can be dangerous even in a noisy environment, for example, by installing it in a noisy sound field generation environment such as a driver's cab or operation room in heavy equipment such as an excavator or a game machine in a game hall such as a pachinko parlor. The warning sound can reach the listener's ear from the direction. Furthermore, you may mount in the vehicle for attraction of an amusement park. By doing so, it is possible to generate a more realistic sound field.

In the above description, the sound field is generated by a 2-channel speaker, but the sound field may be generated by a 3-channel or more speaker. In addition, it is not necessary to reflect the acoustic signals from the speakers of all the channels by the reflecting unit, and the acoustic signals from the speakers of some channels may be directly delivered to the listener 60 without passing through the reflecting unit 40. Good. An acoustic lens that focuses the acoustic signal from the speaker unit 30 on the reflection unit 40 may be provided between the speaker unit 30 and the reflection unit 40. Furthermore, by using a directional speaker for each speaker, reflection to other than the reflection unit 40 can be further prevented.

Further, although not included in the above description, necessary components may be included as appropriate. For example, between the crosstalk cancellation calculation unit 20 and the speaker unit 30, an amplification unit that amplifies the audio signal, a volume adjustment unit that adjusts the volume of the acoustic signal output from the speaker unit 30, and similarly the sound quality of the acoustic signal A sound quality adjustment unit for adjusting the sound quality may be included.
The switching of the listener by the operation of the reflection unit 40 or the speaker unit 30 is not limited to the mode in which the switching operation is performed based on the operation by the listener, and may be switched based on the detection of the listener by a seating sensor or the like.
Furthermore, the glass surface used as the reflection unit 40 may be appropriately changed according to the position of the listener.

DESCRIPTION OF SYMBOLS 1 Sound field generation system 2 Sound field generation apparatus 3 Sound field generation system 10 Sound image localization calculation part 11 Convolution calculation part 12 Convolution calculation part 20 Crosstalk cancellation calculation part 29 Transfer function change part 30 Speaker part 31 Left speaker 32 Right speaker 40 reflector 41 left reflector 42 right reflector 50 lens 51 left lens 52 right lens 60 listener 61 left ear 62 right ear 75 whisper voice converter 80 virtual listener 90 speaker unit 91 left speaker unit 93 case 94 lid 95 Groove 100 Automobile 101 Windshield 102 Right side glass 103 Left side glass 104 Roof glass 105 Handle 106 Driver's seat 107 Rear seat 108 Passenger's seat 109 Dashboard 110 Seat 111 Seat sensor 112 Boarding sensor 114 C Window 115 window sensor 116 angle changing unit 117 car navigation body 118 car navigation display surface

Claims

A speaker unit that outputs a sound of two or more channels, and that outputs an acoustic signal toward a reflection unit that reflects the sound output from the speaker and transmits the sound to a listener;
An audio signal in which a sound image of an acoustic signal output from the speaker unit and reflected by the reflecting unit to reach the listener is localized as a virtual sound source at the listener's position is input, and the input audio signal On the other hand, a crosstalk cancellation calculation unit that performs calculation processing so that crosstalk between the channels of the acoustic signal reflected by the reflection unit and reaching the listener is canceled at the position of the listener;
A sound field generating device comprising:
A sound image localization calculation unit for adding a sound image localization to a sound signal input to the crosstalk cancellation calculation unit so that a sound image of an acoustic signal reaching the listener becomes a virtual sound source at the position of the listener The sound field generation device according to claim 1, further comprising:
A whispering voice conversion unit for converting a voice signal to be heard by the listener into a whispering voice;
The sound image localization calculation unit outputs a sound image of an acoustic signal output from the speaker unit and reflected by the reflection unit and converted into the whispering voice that has reached the listener as a virtual sound source in at least one ear of the listener The sound field generation device according to claim 2, wherein the calculation is performed so that localization is performed.
The sound field generation device according to claim 1, wherein the crosstalk cancellation calculation unit performs a calculation for canceling the crosstalk using a transfer function in consideration of reflection by the reflection unit.
The sound field generation device according to claim 1, further comprising a lens unit that focuses an acoustic signal output from the speaker between the speaker unit and the reflection unit.
The sound field generation device according to claim 1, wherein the crosstalk cancellation calculation unit performs a calculation corresponding to a reflection surface shape of the reflection unit.
The sound field generation device according to claim 1, wherein the speaker and the reflection portion are integrally formed.
The sound field generation device according to claim 1, wherein at least one of an angle of a reflection surface of the reflection unit and an angle of the speaker is variable.
The sound field generation device according to claim 8, wherein the listener is switched by changing at least one of an angle of a reflection surface of the reflection unit and an angle of the speaker.
An angle changing unit that changes at least one of the angle of the reflecting surface of the reflecting unit or the angle of the speaker according to a change in a sound field generation environment including the reflecting unit and the listener as a component;
The crosstalk cancellation calculation unit cancels the crosstalk between the channels of the acoustic signal reflected by the reflection unit and reaching the listener with respect to the input audio signal at the position of the listener. The sound field generation device according to claim 1, wherein the calculation process is performed using a transfer function from the speaker unit to the listener.
A transfer function changing unit that changes the transfer function used in the crosstalk cancellation calculation unit in response to a change in a sound field generation environment including the reflection unit and the listener as components;
The crosstalk cancellation calculation unit cancels the crosstalk between the channels of the acoustic signal reflected by the reflection unit and reaching the listener with respect to the input audio signal at the position of the listener. The sound field generation device according to claim 1, wherein the calculation process is performed using a transfer function from the speaker unit to the listener.
A sound image localization calculation unit for adding a sound image localization to a sound signal input to the crosstalk cancellation calculation unit so that a sound image of an acoustic signal reaching the listener becomes a virtual sound source at the position of the listener Further,
The sound field generation device according to claim 10 or 11, wherein a sound image of an audio signal input to the crosstalk cancellation calculation unit is localized by calculation by the sound image localization calculation unit.
A whispering voice conversion unit for converting a voice signal to be heard by the listener into a whispering voice;
The sound image localization calculation unit outputs a sound image of an acoustic signal output from the speaker unit and reflected by the reflection unit and converted into the whispering voice that has reached the listener as a virtual sound source in at least one ear of the listener The sound field generation device according to claim 12, wherein the calculation is performed so that localization is performed.
The sound field generating device according to claim 11, wherein the transfer function changing unit changes the transfer function according to a position of a seat on which the listener sits in the sound field generating environment.
The sound field generating device according to claim 11, wherein the transfer function changing unit changes the transfer function according to an opening / closing position of a window provided in the sound field generating environment.
12. The transfer function changing unit according to claim 11, wherein the transfer function changing unit changes the transfer function according to whether or not a person other than the listener is sitting on a seat provided in the sound field generation environment. Sound field generator.
At least one of the angle of the reflection surface of the reflection part or the angle of the speaker in the speaker part is variable,
11. The angle of the reflecting surface of the reflecting portion or the angle of the speaker is adjusted according to the position of the seat on which the listener is seated in the sound field generating environment. Or the sound field generation device according to 11.
2. The sound field generation device according to claim 1, wherein the input audio signal is a binaural recorded binaural signal.
The sound field generation device according to claim 1;
A sound field generation system comprising: a reflection unit configured to reflect sound from the speaker unit toward the listener.
20. The sound field generation system according to claim 19, wherein the reflection unit is a vehicle body or an in-vehicle device.
The sound field generation system according to claim 19, wherein the reflection part is at least one of a windshield, a side glass, and a roof glass of an automobile.
The sound field generation according to claim 21, wherein one of the speakers of the two or more channels outputs an acoustic signal toward the windshield, and another speaker outputs an acoustic signal toward the side glass. system.
The sound field generation device according to claim 11,
A reflection unit that reflects the sound from the speaker unit toward the listener;
The reflection part is at least one of a windshield, a side glass, and a roof glass of an automobile,
The sound field generating system, wherein the transfer function changing unit changes the transfer function according to at least one open / close position of the windshield, the side glass, and the roof glass.
Of the left and right side glasses of the automobile, when the side glass closer to the listener is opened than a predetermined position, the side glass closer to the listener is not used as a reflective part, and the other glass is used as a reflective part. The acoustic signal is delivered to the listener, and when the side glass closer to the listener is closed than a predetermined position, the acoustic signal is transmitted to the listener using the side glass closer to the listener as a reflecting portion. The sound field generation system according to claim 23, wherein an angle of the speaker unit is changed so as to be delivered to the sound field.
An audio signal in which a sound image of an acoustic signal output from a speaker unit having a speaker that outputs sound of two or more channels and reflected by a reflection unit and reaches a listener is input as a virtual sound source at the listener's position is input. Steps,
A step of performing arithmetic processing so that crosstalk between the channels of the acoustic signal reflected by the reflection unit and reaching the listener is canceled at the position of the listener with respect to the input audio signal;
Outputting an acoustic signal toward the reflection unit that reflects the sound output from the speaker unit and transmits the sound to the listener;
A sound field generation method comprising:
In the step of performing the arithmetic processing, the crosstalk between the channels of the acoustic signal that has been reflected by the reflection unit and reached the listener with respect to the input audio signal is canceled at the position of the listener. In addition, performing a calculation process using a transfer function from the speaker unit to the listener,
The method further comprises a step of changing the transfer function used in the arithmetic processing for canceling the crosstalk in response to a change in a sound field generation environment including the reflector and the listener as constituent elements. Item 26. The sound field generation method according to Item 25.