JP2003032776A - Reproduction system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a reproduction system capable of always performing optimal processing on an audio signal output from a reproduction device regardless of the position of a listener. SOLUTION: A reproducing system 100 includes a video capturing means 102 for capturing a video including at least a part of a listener 101, a reproducing apparatus 107 for outputting an audio signal by reproducing an audio, and a video output from the video capturing means 102. Detecting means 106 for detecting the position of the listener 101 based on the detected video signal, and a reproducing apparatus 107 for performing processing in accordance with the position of the listener 101 detected by the detecting means 106.
Control device 10 for the sound signal output from
8 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing apparatus for AV (audio / visual) equipment or the like for reproducing sound which is preferable for listeners.

[0002]

2. Description of the Related Art Sound propagation varies depending on the positional relationship between the sound source and the listener and the environment between the sound source and the listener. Therefore,
By detecting a difference in sound propagation, the listener can perceive the position of the sound source and the impression of the environment. For example, when the sound source position is fixed in front of the listener, the sound reaching the left and right ears is the left sound when the listener turns his face to the right, and the right sound when the listener turns to the left. growing. Due to such a relationship between the change in the position of the listener and the change in the sound heard by both ears, the listener can more clearly perceive the presence of the sound source.

Utilizing this, by detecting a change in the position of the listener, performing a predetermined voice processing and presenting it to the listener, it becomes possible to reproduce a more realistic voice. As an example thereof, there is a reproducing apparatus for a video signal and an audio signal described in JP-A-7-822235. This is provided with detection means for detecting relative movement between the virtual sound source on the video signal reproduction means and the listener's head, and can realize sound image control corresponding to movement of the listener in headphone reproduction. .

Sound image control using a speaker has been proposed as well as sound image control using headphones. A method of performing sound image control using a speaker is a transaural (trans) method.
This is called the "saural" method. The trans-aural method is a method in which a signal equivalent to an acoustic signal reaching both ears of a listener in the original sound field is generated in both ears of the listener by a speaker in the reproduced sound field. That is, it is ideal that the right ear (right channel input) signal in the original sound field exactly reaches the right ear in the reproduced sound field, and the left channel signal exactly reaches the left ear. However, the use of the speaker causes a phenomenon (crosstalk) in which a signal on one side reaches the opposite ear. As a result, sound image control cannot be performed. Therefore, in the trans-aural method, crosstalk is suppressed, so that the DSP (Digital S
This is realized by using a digital filter according to the (Internal Processor).

[0005]

However, there is a problem in that the crosstalk suppression is not correctly performed when the position of the listener moves and the effect of sound image control deteriorates. Therefore, if the position of the listener is detected and a predetermined process can be performed for the change, crosstalk can be suppressed and the assumed sound image control can be realized. At the same time, it is effective to detect the movement of the listener and to move the virtual sound source so as to correspond to the movement of the listener, in order to reproduce the sound with a sense of reality.

In the case of speaker reproduction, the listeners are not limited in many cases, such that all the persons within the range of transmitting sound can be listeners. It can be said that it is easier and preferable for the listener to detect the listener's position without attaching a detection device to the listener.

The present invention has been made in view of the above problems, and makes it possible to always perform optimum processing on an audio signal output from a reproducing apparatus regardless of the position of the listener. The purpose is to provide a reproduction system.

[0008]

A reproduction system of the present invention is a video capturing means for capturing a video including at least a part of a listener, a reproducing device for outputting a voice signal by reproducing a voice, and the video capturing. Based on the video signal output from the means, a detecting unit that detects the position of the listener, and a process according to the position of the listener detected by the detecting unit is performed on the audio signal output from the reproducing device. And a voice control device for performing the same, thereby achieving the above object.

The playback device may output audio signals of two or more channels.

The detecting means may detect the position of the head of the listener.

The audio control device may perform a sound image control process according to the position of the listener detected by the detection means on the audio signal output from the reproduction device.

The audio control device may perform directivity control processing according to the position of the listener detected by the detection means on the audio signal output from the reproduction device.

The detecting means may further detect the number of listeners.

The reproduction system may be used in a mobile terminal.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows an example of the configuration of a reproduction system 100 according to Embodiment 1 of the present invention.

The reproducing system 100 includes a video capturing means 102 for capturing a video, a reproducing device 107 for reproducing an audio signal to output an audio signal, and an audio control for processing an audio signal output from the reproducing device 107. And device 108. The audio signal output from the audio control device 108 is output to the speakers 103 and 104.

The reproduction device 107 may output the video signal by reproducing the video in addition to outputting the audio signal. The video signal output from the playback device 107 is output to the display 105.

As the reproducing device 107, for example, a CD,
Audio equipment such as MDs and semiconductor players, DVDs,
AV equipment such as a BS digital television receiver and multimedia equipment such as a personal computer can be preferably used.

The video capture means 102 is oriented such that the video captured by the video capture means 102 includes at least a portion of the listener 101 (eg, the listener's head). The video capturing means 102 outputs a video signal corresponding to the captured video.

A camera can be preferably used as the image capturing means 102. The camera, for example,
It is installed on the display 105. In order to improve the accuracy of detecting the position of the listener, the image capturing means 1
Multiple cameras may be used as 02.

The reproduction system 100 further includes detection means 106 for detecting the position of the listener based on the video signal output from the video capturing means 102. The audio control device 108 performs a process (for example, a sound image control process or a directivity control process) according to the position of the listener detected by the detection means 106 on the audio signal output from the reproduction device 107. The detection unit 106 may detect the position of the listener's head, for example, as the position of the listener.

FIG. 2A shows an example of the configuration of the detection means 106 and the voice control device 108 of the reproduction system 100.

The detecting means 106 is the image capturing means 10.
2 performs predetermined signal processing (for example, contour emphasis processing or color emphasis processing) on the video signal output from the video signal 2, and based on the output from the video signal processing section 202, A position information extraction unit 203 that extracts information indicating the position (for example, information indicating the position of the listener's head). The information indicating the position of the listener is the voice control device 10.
8 is input.

The voice controller 108 has a memory (eg,
Of the plurality of filter coefficients stored in the ROM), a coefficient selecting unit 205 that selects a filter coefficient corresponding to the input information indicating the position of the listener and a filter coefficient selected by the coefficient selecting unit 205 are used. A sound image control unit 206 that performs a sound image control process on the audio signal output from the reproduction device 107 is included.

Examples of the sound image control processing include delay control, sound pressure level control, crosstalk cancellation, convolution calculation of a head related transfer function from a virtual sound source, and the like. The signal output from the sound image control unit 206 is the amplification device 2
It is output to the speakers 103 and 104 via 08.

In the example shown in FIG. 2A, the playback device 107
The audio signal output from is a 2-channel signal. However, the number of audio signal channels is not limited to two. The audio signal output from the reproduction device 107 may be a signal of two or more channels. For example, the playback device 107
May output a 5.1-channel multi-channel audio signal, which is handled in DVD or BS digital television broadcasting, to the sound image control unit 206.

In the example shown in FIG. 2A, two-channel speakers 103 and 104 are used. However, the number of speaker channels is not limited to two. In order to improve the accuracy of sound image control, or to control two or more listeners or multiple points in the vicinity of the listeners, it is possible to use speakers of two or more channels.

FIG. 2B shows an example of the configuration of the mobile phone 120 in which the reproduction system 100 is mounted. In FIG. 2B, the same components as those shown in FIGS. 1 and 2A are designated by the same reference numerals, and the description thereof will be omitted.

In the example shown in FIG. 2B, the mobile phone 120
Includes an audio generation unit 110 that generates an audio signal instead of the reproduction device 107 shown in FIGS. 1 and 2A. The voice signal may be a ring tone, music, voice of the other party, etc. recorded in the midi or mld format. The audio signal generation unit 110 inputs the signal of the left channel to the input terminal Lin of the sound image control unit 206, and inputs the signal of the right channel to the input terminal Rin of the sound image control unit 206.

The reproduction system 100 can be used in any type of portable terminal.

FIG. 3 shows a specific example of detection of the listener's position by the detection means 106. In the example shown in FIG. 3, it is assumed that the image capturing means 102 is arranged at the origin of the XY plane.

Within the range of the visual field (hatched portion in FIG. 3) of the image capturing means 102, the listeners 303, 3
Assume that 04 exists. The positions of the listeners 303 and 304 are represented by the viewing angle and the distance. here,
The visual field angle is the reference line 301 of the visual field of the image capturing means.
Is a counterclockwise angle, and the distance is the distance between the image capturing means 102 and the listener 303 (or listener 304).

In FIG. 3, reference numeral 302 schematically indicates a video captured by the video capturing means 102. The captured image 302 is the image 30 of the listener 303.
5 and a video 306 of the listener 304. The width of the captured image 302 is a, and the image 305 is located at a position b from the right end of the captured image 302 (a, b).
The unit of is a pixel, for example).

When the viewing angle of the image capturing means 102 is A and the viewing angle of the listener 303 is B, (Equation 1) is established.

[0036]

## EQU00001 ## b / a = B / A Therefore, the viewing angle B of the listener 303 is obtained by (Equation 2).

[0037]

## EQU00002 ## B = (b / a) * A The distance between the image capturing means 102 and the listener 303 can be obtained by, for example, detecting the size of the face of the listener 303 in the captured image 302. it can. Distance between image capturing means 102 and listener and captured image 30
The relationship with the size of the listener's face in 2 is measured in advance and stored in a memory (not shown). In the captured image 302, the face size of the listener 303 is larger than the face size of the listener 304. This is because the distance between the image capturing means 102 and the listener 303 is shorter than the distance between the image capturing means 102 and the listener 304.

Although the size of the human face varies from person to person, it can be assumed that the size of the human face is the same when detecting this distance. Further, when the size of the listener's face is known in advance, it is possible to more accurately determine the distance between the image capturing means and the listener.

Further, when the two video capturing means can be installed at different positions, the difference between the video signals output from the two video capturing means is used to determine the distance between the reference point and the listener. It is also possible to ask.

In this way, the viewing angle of the listener 303 and the distance between the image capturing means 102 and the listener 303 can be detected as the information indicating the position of the listener 303. Similarly, as the information indicating the position of the listener 304, the viewing angle of the listener 304 and the image capturing means 10 are obtained.
2 and the distance between the listener 304 can be detected.

Various methods can be used to detect the size of the listener's face. For example, contour detection may be used to detect the approximate location and shape of the listener, and then skin color detection may be used to detect the listener's face size. Alternatively, instead of skin color detection, or in addition to skin color detection, the size of the listener's face may be detected using facial features such as eyes, hair, and mouth.

An example of contour detection using digital filtering will be described with reference to FIG. In FIG. 4, a square dot indicates one pixel, a black pixel (hatched portion in FIG. 4) has a value of 1, and a white pixel has a value of 0.

FIG. 4A shows an example of an image captured by the image capturing means 102. Such a contour of an image can be detected by performing a filtering process in the vertical and horizontal directions of the image using, for example, an FIR digital filter having a coefficient [1-1]. This is because this FIR digital filter has the property of detecting a change in the data to be filtered and outputting a value other than 0.

FIG. 4B shows the result of filtering the image shown in FIG. 4A using the FIR digital filter. In this way, outline detection can be used to detect the approximate position and shape of the listener.

When it is possible to detect the listener's eyes, it is also possible to detect the orientation of the listener's face.

FIG. 5 shows the sound image controller 20 shown in FIG. 2A.
6 shows an example of the configuration of No. 6. The sound image control unit 206 has two input terminals Lin and Rin and two output terminals Lout and Rin.
out and.

An audio signal of the left channel is input to the input terminal Lin from the reproducing device 107 (FIG. 2A). The audio signal of the right channel is input to the input terminal Rin from the playback device 107 (FIG. 2A). The signal output from the output terminal Lout is transmitted to the speaker 1 via the amplification device 208.
04. The signal output from the output terminal Rout is supplied to the speaker 103 via the amplification device 208.

The sound image control unit 206 includes filters 501 to 5
04 and adders 505 and 506. Filter 50
The inputs of 1, 502 are connected to the input terminal Lin.
The inputs of the filters 503 and 504 are connected to the input terminal Rin. The adder 505 adds the output of the filter 501 and the output of the filter 503, and outputs the addition result to the output terminal Lout. The adder 506 is the filter 5
02 output and the output of the filter 504 are added, and the addition result is output to the output terminal Rout.

Here, the filters 501, 502, 50
The filter coefficients of 3 and 504 are Xll and Xl, respectively.
Let r, Xrl, and Xrr.

FIG. 6 shows the coefficient selecting section 20 shown in FIG. 2A.
5 shows an example of a table 600 stored in a memory (for example, a ROM) in the memory 5. The table 600 is used when only one listener exists within the visual field range of the video capturing means 102. In FIG. 6, C ₁₁ , C ₁₂ , ...
., C _{(n + 1) 4} is an array of numerical values (for example,
[0.1, 0.2, 0.3, -0.3, 0.01]) is shown. The number of numbers in the array depends on the control performance.

The table 600 includes a set of filter coefficients (Xll, Xlr, Xrl, Xrr) defined for each information (viewing angle, distance) indicating the position of the viewer.

The coefficient selection unit 205 includes the position information extraction unit 20.
Information indicating the position of the listener output from 3 (viewing angle,
A set of filter coefficients (Xll, Xlr,
Xrl, Xrr) and select the selected filter coefficient set (Xll, Xlr, Xrl, Xrr) as the sound image control unit 2
It outputs to 06. As a result, the selected filter coefficient set (Xll, Xlr, Xrl, Xrr) is set in each of the filter sets (filter 501, filter 502, filter 503, and filter 504) included in the sound image control unit 206.

For example, if the listener (viewing angle, distance) =
When it exists at the position of (0 °, 0.5 m), the coefficient selection unit 205 sets the filter coefficient set (Xll, Xlr, Xrl, Xrr) = (0 °, 0.5m) =
Select (C ₁₁ , C ₁₂ , C ₁₃ , C ₁₄ ). Selected filter coefficient set (Xll, Xlr, Xrl, Xrr) =
(C ₁₁ , C ₁₂ , C ₁₃ , C ₁₄ ) is a set of filters (filter 501, filter 50) included in the sound image control unit 206.
2, filter 503, and filter 504).

As described above, by updating the filter coefficient of the sound image control unit 206 according to the relative position of the listener with respect to the reproduction system 100, the optimum sound image control is always performed regardless of the position of the listener (for example, It is possible to control the sound image localization for localizing the sound image). It is preferable that the filter coefficient of the sound image control unit 206 be updated in real time in accordance with the change in the position of the listener.

Normally, the filter coefficient of the sound image control unit 206 is designed in one way on the assumption that the listener is located in front of the reproduction system 100. On the other hand, in the present invention, the filter coefficient of the sound image control unit 206 is designed in a plurality of ways on the assumption that the listener exists at a plurality of positions with respect to the reproduction system 100. As a result, even if the relative position of the listener with respect to the reproduction system 100 changes, the sound image control unit 206 can be changed according to the position of the listener.
By updating the filter coefficient of, it is possible to always perform optimum sound image control.

FIG. 7 shows the coefficient selection unit 20 shown in FIG. 2A.
5 shows an example of a table 700 stored in a memory (for example, ROM) in the memory 5. The table 700 is used when there are two listeners within the visual field range of the video capturing means 102. In FIG. 7, C ₁₁ ′, C ₁₂ ′, ...
.., each of C ₃₄ 'is an array of numbers (eg,
[0.1, 0.2, 0.3, -0.3, 0.01]) is shown. The number of numbers in the array depends on the control performance.

The table 700 includes filter coefficients defined for each set of information (viewing angle, distance) indicating the position of the first listener and information indicating the position of the second listener (viewing angle, distance). The set (Xll, Xlr, Xrl, Xrr) is included.

When the sound is reproduced using the two speakers, it is possible to control the sound at the two control points. When only one listener exists within the visual field range of the image capturing means 102, it is preferable to arrange the two control points in the vicinity of both ears of the listener. When there are two listeners within the field of view of the image capturing means 102, it is preferable to arrange the two control points at the center positions of the heads of the listeners. When the number of listeners is two, the performance of sound image control is inferior to that when there is only one listener, but it is possible to realize sound image control to some extent. In this way, by changing the arrangement of the control points according to the number of listeners existing within the visual field range of the image capturing means 102, it is possible to realize appropriate sound image control suitable for the number of listeners. become.

As the information indicating the position of the listener,
Other than (viewing angle, distance) or (x, y) coordinates may be used.

If the orientation of the listener's face can be detected, a parameter indicating the orientation of the face is added to the tables shown in FIGS. 6 and 7, and the information indicating the listener's position and the listener's position are received. It is preferable to define a set of filter coefficients (Xll, Xlr, Xrl, Xrr) for each set of information indicating the orientation of the listener's face. This makes it possible to always perform optimum sound image control (for example, control of sound image localization for localizing a sound image) regardless of the position of the listener and the orientation of the listener's face.

(Second Embodiment) FIG. 8 shows an example of the configuration of a reproducing system 200 according to a second embodiment of the present invention. Figure 8
2A, the same components as those shown in FIG. 2A are designated by the same reference numerals, and the description thereof will be omitted.

The reproduction system 200 is a car stereo system mounted on a car. The playback device 200 includes speakers 801 to 804. The speaker 801 is installed on the left front door. The speaker 802 is installed on the right front door. The speaker 803 is installed on the left rear dashboard. The speaker 804 is installed on the right rear dashboard.

The image capturing means 102 (for example, a camera) is installed on, for example, a room mirror or a front dashboard.

The voice control device 808 is a memory (eg,
Of the plurality of filter coefficients stored in the ROM), the coefficient selecting section 805 selecting a filter coefficient corresponding to the information indicating the position of the listener, and the reproducing apparatus 107 using the filter coefficient selected by the coefficient selecting section 805. A sound image control unit 80 that performs a sound image control process on a sound signal output from
6 and.

FIG. 9 shows a sound image control unit 806 shown in FIG.
An example of the configuration will be shown. The sound image control unit 806 has two input terminals Lin and Rin and four output terminals FLout and Fin.
It has Rout, RLout, and RRout.

The audio signal of the left channel is input to the input terminal Lin from the reproducing device 107 (FIG. 8). A right channel audio signal is input from the playback device 107 (FIG. 8) to the input terminal Rin. The signal output from the output terminal FLout is transmitted to the speaker 80 via the amplification device 208.
1 is supplied. The signal output from the output terminal FRout is supplied to the speaker 802 via the amplification device 208. The signal output from the output terminal RLout is supplied to the speaker 803 via the amplification device 208. The signal output from the output terminal RRout is amplified by the amplification device 208.
Is supplied to the speaker 804 via the.

The sound image control unit 806 includes filters 911 to 9
14, 921-924, 931-934, 941-94
4 and adders 951 to 954, 961 to 964, 971
.About.974.

Here, the filter coefficients of the filters 911 to 914 are X11 to X14, respectively, and the filter 92
It is assumed that the filter coefficients of 1 to 924 are X21 to X24, the filter coefficients of the filters 931 to 934 are X31 to X34, and the filter coefficients of the filters 941 to 944 are X41 to X44, respectively.

FIG. 10 shows the coefficient selection unit 80 shown in FIG.
5 shows an example of a table 1000 stored in a memory (for example, ROM) in the memory 5. In FIG. 10, C ₁₁₁ ,
Each of C ₁₁₂ , ..., C ₄₄₄ is an array of numerical values (for example, [0.1, 0.2, 0.3, −0.3, 0.01]).
Indicates. The number of numbers in the array depends on the control performance.

The table 1000 is a set of filter coefficients (X11 to X14, X21) defined for each boarding pattern.
To X24, X31 to X34, X41 to X44).

The coefficient selection unit 805 has a position information extraction unit 20.
Of filter coefficients (X11 to X14, X) corresponding to the information (boarding pattern) indicating the position of the listener output from No. 3 of FIG.
21-X24, X31-X34, X41-X44), and the set of selected filter coefficients (X11-X14,
X21 to X24, X31 to X34, X41 to X44) are output to the sound image control unit 806. As a result, the set of selected filter coefficients (X11 to X14, X21 to X24, X
31-X34, X41-X44) are sound image control units 806.
Are set in the set of filters (filters 911 to 914, filters 921 to 924, filters 931 to 934, and filters 941 to 944).

In FIG. 10, for example, the boarding pattern (a) shows one person riding in the driver's seat, the boarding pattern (b) shows two people riding in the driver's seat and the passenger seat, and the boarding pattern (c) shows , 4 seats in the driver's seat, passenger seat and rear seat.

Such a boarding pattern is used in the first embodiment.
It can be determined by detecting the number and position of listeners as described above. However, because the position of the car seat is fixed, the position of the listener is also limited. Therefore, the detection of the information indicating the position of the listener may be simplified as compared with the first embodiment.

Further, instead of the image capturing means 102 and the detecting means 106, a sensor (for example, a pressure sensor) for detecting that a person is sitting on the seat is attached to the seat so that the boarding pattern can be determined. Good.

When the sound is reproduced using the four speakers, it is possible to control the sounds at the four control points.

FIG. 11 shows the relationship between the boarding pattern and the arrangement of the four control points. In FIG. 11, x indicates a control point.

As shown in FIG. 11 (a), when the riding pattern indicates that one person is riding in the driver's seat, it is preferable to arrange four control points in the vicinity of both ears of the listener in the driver's seat. As shown in FIG. 11 (b), when the riding pattern indicates that two passengers are riding in the driver's seat and the passenger's seat, two control points out of the four control points are located near both ears of the listener in the driver's seat. It is preferable to arrange the remaining two control points in the vicinity of both ears of the listener in the passenger seat. As shown in FIG. 11 (c), when the riding pattern indicates that the driver's seat, the passenger's seat, and the rear seat are for four passengers, each of the four control points should be arranged at the center position of the head of each listener. Is preferred.

When the riding pattern is for four passengers, the sound image control performance is inferior to that for one passenger or two passengers, but it is possible to realize some degree of sound image control. . In this way, according to the number of listeners existing within the visual field range of the image capturing means 102,
By changing the arrangement of the control points, it is possible to realize appropriate sound image control suitable for the number of listeners.

If the age of the listener can be detected, sound image control may be performed according to the age of the listener. For example, when the listener is an elderly person, it is preferable to process the audio signal so that the sound pressure is higher than usual.

When individual identification is possible, sound image control may be performed according to individual preference.

In the example shown in FIG. 8, the audio signal output from the reproducing device 107 is a 2-channel signal.
However, the number of audio signal channels is not limited to two.
The audio signal output from the reproduction device 107 may be a signal of two or more channels. For example, the playback device 107
A 5.1-channel multi-channel audio signal used in DVDs, BS digital television broadcasting, etc. may be output to the sound image control unit 806.

In the example shown in FIG. 8, 4-channel speakers 801 to 804 are used. However, the number of speaker channels is not limited to four. In order to improve the accuracy of sound image control, or to control two or more listeners or multiple points near the listeners, it is possible to use a speaker with four or more channels.

As described above, in the first and second embodiments, an example in which the voice control device performs the sound image control process has been mainly described. Depending on the application, the voice control device can also perform processing other than the sound image control processing. It is also possible to switch between the sound image control processing and other processing according to the image captured by the image capturing means. As the processing other than the sound image control processing,
For example, directivity control processing can be mentioned. The directivity control process is, for example, a process of detecting a target listener based on the captured image and controlling so that sound is transmitted only in the direction of the target listener.

A sharp beam of sound can be realized by using a superdirective speaker technology using a multi-channel speaker. By directing this toward the listener, it is possible to propagate the sound only to the listener. Further, the sound image control process and the directivity control process may be switched.

Each means and each device included in the reproduction system 100 or the reproduction system 200 may be realized by hardware, software, or a combination of hardware and software. May be done.

[0086]

As described above, according to the present invention, it is possible to provide a reproduction system capable of always performing the optimum processing on the audio signal output from the reproduction device regardless of the position of the listener. become. As a result, it is possible to realize more realistic audio reproduction that is preferable to the listener.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a configuration of a reproduction system 100 according to a first embodiment of the present invention.

FIG. 2A is a diagram showing an example of a configuration of a detection unit 106 and a voice control device 108 of the reproduction system 100.

FIG. 2B is a mobile phone 1 in which the reproduction system 100 is mounted.
The figure which shows an example of the structure of 20

FIG. 3 is a diagram showing a specific example of detection of a listener's position by detection means 106.

FIG. 4 is a diagram for explaining an example in which contour detection is performed using digital filter processing.

5 is a diagram showing an example of a configuration of a sound image control unit 206 shown in FIG. 2A.

6 is a diagram showing an example of a table 600 stored in a memory in the coefficient selection unit 205 shown in FIG. 2A.

7 is a diagram showing an example of a table 700 stored in a memory in the coefficient selection unit 205 shown in FIG. 2A.

FIG. 8 is a diagram showing an example of a configuration of a reproduction system 200 according to a second embodiment of the present invention.

9 is a diagram showing an example of the configuration of a sound image control unit 806 shown in FIG.

10 shows an example of a table 1000 stored in a memory (for example, ROM) in the coefficient selection unit 805 shown in FIG.

FIG. 11 is a diagram showing a relationship between a boarding pattern and arrangement of four control points.

[Explanation of symbols]

100 reproduction system 101 listener 102 image capturing means 103, 104 speaker 105 display 106 detection means 107 Playback device 108 voice control device

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Claims (7)

[Claims] 1. A video capturing means for capturing a video including at least a part of a listener, a reproducing device for outputting an audio signal by reproducing a voice, and a video signal output from the video capturing means, A detection unit that detects the position of the listener, and a voice control device that performs processing according to the position of the listener detected by the detection unit on the audio signal output from the reproduction device, Playback system. 2. The reproduction system according to claim 1, wherein the reproduction device outputs audio signals of two or more channels. 3. The reproduction system according to claim 1, wherein the detection means detects the position of the head of the listener. 4. The sound control device according to claim 1, wherein the sound control device performs a sound image control process according to the position of the listener detected by the detection means on the sound signal output from the reproduction device. Reproduction system. 5. The audio control device according to claim 1, wherein the audio control device performs directivity control processing according to the position of the listener detected by the detection means on the audio signal output from the reproduction device. Playback system described. 6. The reproduction system according to claim 1, wherein the detection unit further detects the number of listeners. 7. The reproduction system according to claim 1, wherein the reproduction system is used in a mobile terminal.