JP2011259298A - Three-dimensional sound output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a three-dimensional (3D) sound field associating with a displayed 3D image and more powerful 3D sound saving effort of arranging speakers.SOLUTION: A moving image 23 is displayed at a screen 4a, and when its movement is larger than a specified value, its motion vector a is detected and mapped in a display area 25 corresponding to the screen 4a, and a position of the moving image 23 is detected. On each side of the screen 4a, a plurality of, for example, two speakers 14 are provided, and positions of the speakers 14 are mapped with the display area 25, and the speaker 14 for generating sound is switched associating with the movement of the moving image 23. For example, when the moving image 23 moves as it is shown in the diagram, left side speakers 14Land 14Loperate first, the left side speaker 14Land a right side speaker 14Roperate next, and then the right side speakers 14Rand 14Roperate.

Description

  The present invention relates to an audio output device of a three-dimensional video display device, and more particularly, an effective three-dimensional audio for a three-dimensional video by changing a driving mode of a speaker in accordance with the movement of the displayed three-dimensional video. The present invention relates to a three-dimensional audio output device that can realize output.

  The audio signal in the video display device starts from monaural audio reproduction and progresses to stereo audio reproduction. In recent years, speakers are simply arranged around the viewer (hereinafter referred to as the user), that is, in front of the user. In addition, the sound has been developed to be three-dimensional by a surround system in which speakers are arranged as surround speakers on the left and right sides and rear left and right of the user. In addition, a system in which an audio output device is integrated with a video display device so that a video or a sound image desired to be asserted in a video scene can be changed in various ways according to the user's preference and enjoyed.

  As one conventional example, a 2D (two-dimensional) video signal is converted into a 3D (three-dimensional) video signal to display a 3D video, and when the audio signal of the video signal is a monaural signal, The audio signal is converted into a stereo signal and supplied to two speakers provided on the left and right sides. If the audio signal is a stereo signal, the audio signal is converted into a pseudo-stereo signal and the two signals are converted into a stereo signal. A technique for supplying to a speaker has been proposed (see, for example, Patent Document 1).

  This Patent Document 1 specifically shows a pseudo-stereoscopic means for converting a monaural signal into a pseudo-stereo signal, and a pseudo-stereoscopic means for converting a stereo signal into a pseudo-stereoscopic signal. By being supplied to the speaker and the right speaker, it is possible to obtain a feeling of expansion of the horizontal sound field between the two speakers and a feeling of popping out in the front direction (the direction of the listening user), and the pseudo three-dimensional signal is left. , By supplying the right speaker, it is possible to obtain a feeling of spreading in the horizontal direction, a feeling of popping out in both side directions, and a feeling of popping out in the front direction.

  In the technique described in Patent Document 1, it is also determined whether the input audio signal is a monaural signal or a stereo signal. In the case of a monaural signal, the same audio signal is input as a left signal and a right signal, and in the case of a stereo signal, the left signal and the right signal are input, so even if it is a monaural signal, Even in the case of a stereo signal, it is determined whether the signal is a monaural signal or a stereo signal by detecting the difference between the left signal and the right signal and comparing the integrated value of the difference with a threshold value. If the input audio signal is a monaural signal according to the determination result, the pseudo stereo signal from the pseudo stereo processing means is supplied to the left speaker and the right speaker, and the input audio signal is a stereo signal. The pseudo three-dimensional signal from the pseudo three-dimensional device is supplied to the left speaker and the right speaker.

  As another conventional example, three front speakers of a right speaker R and a left speaker L arranged on the right side of the front and a center speaker C installed between them are used, and 3- A technique has been proposed in which a surround effect can be obtained without using a surround speaker by using such three front speakers for a 1-system 4-channel stereo or 2-2-system 4-channel stereo audio signal (for example, , See Patent Document 2).

  In the technique described in Patent Document 2, when audio is output in 3-1 system 4-channel stereo, the front audio signal of 3 channels of L (left) signal, R (right) signal, and C (center) signal is The rear audio signal of one channel of the S (surround) signal is decoded from the high-definition signal, the L1 signal for the left speaker from the L signal and the S signal, and the R1 signal for the right speaker from the R signal and the S signal, respectively. And are supplied to the left speaker L and the right speaker R, respectively. The C signal is supplied to the center speaker C as a C1 signal as it is.

  When audio is output in 2-2 system 4-channel stereo, the front audio signal, SL (surround left) signal and SR (surround right) of the 2-channel L (left) signal and R (right) signal from the high-definition signal. ) The two-channel rear audio signal of the signal is decoded, and the SL signal and the SR signal are added to obtain the SL + SR signal, and the L2 signal for the left speaker is obtained from the L signal and the SL + SR signal by the R signal and the SL + SR signal. R2 signals for the right speaker are respectively created from the left speaker L and supplied to the left speaker L and the right speaker R, respectively. The C signal is supplied to the center speaker C as it is as a C2 signal.

JP-A-9-205295 JP-A-5-56500

  By the way, a 3D video display device that has recently become a hot topic displays images for the left and right eyes that are relatively shifted by the parallax between the left and right eyes, and recognizes them as stereoscopic images by using, for example, dedicated glasses. There is something called.

  However, the conventional surround sound and sound images output from the 3D video display device are compatible with the projection direction of 3D video display, etc., although the conventional stereo sound or surround sound can be selected. In addition, the present situation is that there is no control of the sound image corresponding not only to the front of the screen of the object in the video but also to the 3D video display part projecting in the horizontal or vertical direction.

  In addition, the conventional surround sound output device has 5.1 channels (a total of five speakers, left and right speakers and a center speaker on the front side, and left and right surround speakers on the rear side) arranged outside the video display device. In addition, an audio speaker such as one speaker dedicated to ultra-low sounds is arranged), and 7.1 channels (5.1 channels are further arranged with surround speakers on the left and right sides of the user) are arranged. In many cases, the sound system is constructed by a surround system. In this case, it is necessary to secure a viewing place with a certain amount of room space and a distance between each audio speaker, and in sound image formation such as the troublesome arrangement of a large number of speakers and the securing of a certain distance between audio speakers. It was necessary for viewers to deal with restrictions and the like. At the same time, in this sound field environment, it may be necessary to set the sound image using a sound image setting function such as an amplifier dedicated to external sound or an equalizer function, and in particular, 3D video or 2D video and 3D video. In switching etc., it is also necessary to switch the sound image setting according to the video scene, and in order to obtain a certain degree of realism, a sound field with the size of the room and the distance between the audio speakers is necessary, In some cases, viewing is performed while maintaining the sound field once adjusted without changing the predetermined setting.

  Furthermore, in video display of promotional content called digital signage (digital signage), the sound effect is set to be effective when the installation means or arrangement direction of the video display device is changed. In addition, there are many cases where the user needs to set the arrangement and structure of the audio speaker in accordance with the content for video display, and switch the direction depending on the direction of the audio speaker and the vertical and horizontal installation of the video display device.

  According to such a speaker installation state, since the position of the audio speaker is set in accordance with the video display device, it is an excellent system in terms of acoustic effect. However, since a large number of audio speakers are used, the arrangement change, connection change, or audio This requires a lot of work including the layout of the speaker itself, and the system itself requires a plurality of audio speakers, resulting in an expensive system.

  On the other hand, in the technique described in Patent Document 1 described above, sound output is performed using two left and right speakers in a 3D video display device. In addition, in the technique described in Patent Document 2 described above, For high-definition broadcasting, audio output is performed using three speakers, the left and right speakers and the center speaker arranged between them, so the number of required speakers can be greatly reduced. In addition, it is possible to save the trouble of arranging the speakers and to reduce the price of the system.

  By the way, in the technique described in Patent Document 1 above, when the input audio signal is a stereo audio signal in 3D video display, a pseudo three-dimensional signal is generated from the stereo audio signal, and sound is reproduced using the pseudo three-dimensional signal. By doing so, it is possible to obtain a sense of horizontal spread, a sense of popping out in both directions, and a sense of popping out in the front direction in the reproduced sound, and a three-dimensional sound field can be obtained with 3D video display. Such an acoustic effect is obtained by supplying the left audio signal of the obtained pseudo three-dimensional signal to the left speaker and the right audio signal to the right speaker.

  However, even if the pseudo three-dimensional signal is generated in this way, the sound is played back by the two left and right speakers, so that the video moving in the direction crossing the screen in 3D video display or the video moving so as to jump out to the front On the other hand, a sound field that moves effectively in conjunction with this cannot be generated. For example, when moving so that the vehicle image crosses the screen and approaches the user viewing the screen, the sound field is such that the user approaches the user from one side of the screen to the other. As a result, the stereoscopic effect of the 3D video display is further increased, but such a sound field effect cannot be obtained only by using the left and right speakers.

  The technique described in Patent Document 2 uses three speakers, a left speaker and a center speaker, on the front side, but inputs front, rear, and center four-channel surround sound signals. , Generating right and left signals from front and rear audio signals, supplying them to the right speaker and left speaker, and supplying a center signal to the center speaker to obtain a surround effect, Thus, a sound field linked to the movement of the image moving on the screen is not generated.

  An object of the present invention is to solve such problems, save the trouble of arranging speakers, generate a three-dimensional sound field in conjunction with the movement of the displayed 3D video, and generate more powerful 3D sound. It is an object of the present invention to provide a three-dimensional audio output device that can be used.

  In order to achieve the above object, the present invention is an audio output device of a video display device capable of displaying a three-dimensional video image, and includes a plurality of speakers along each side of the display screen of the video display device. Is arranged to control the operation of the speaker on each side according to the motion of the motion video on the display screen, and to change the sound field in conjunction with the motion of the motion video.

  Further, the present invention is characterized in that the display screen has a quadrangular shape, and each side on which the speaker is arranged is the left side, the right side, and the lower side of the display screen.

  Alternatively, the present invention is characterized in that the display screen has a rectangular shape, and the sides on which the speakers are arranged are all sides of the display screen.

  Alternatively, the present invention is characterized in that the display screen has a rhombus shape and the sides on which the speakers are arranged are all sides of the display screen.

  The present invention also provides a motion vector detecting means for detecting a motion vector of a motion video of a video signal input to the video display device, a control means for detecting a motion video on a display screen from the motion vector, and a control means. And a distribution processing unit that adjusts the audio signal distributed and supplied to the speaker and switches the speaker that distributes and supplies the audio signal in conjunction with the detected motion video motion, and is linked to the motion video motion Thus, a changing sound field is formed.

  According to the present invention, a plurality of speakers are provided on each side of the display screen of the video display device, and the speaker that operates according to the motion of the motion video displayed on the display screen is switched. A sound wave that moves the sound source in conjunction with the movement of the image is formed, and a powerful three-dimensional sound field (acoustic space) is obtained.

  In addition, since each speaker is arranged around the display screen of the video display device, its position is fixed with respect to the display screen. Therefore, it is not necessary to consider the arrangement, and the labor for that is saved.

It is a block block diagram which shows the video display apparatus using 1st Embodiment of the audio | voice output apparatus by this invention. FIG. 2 is a block configuration diagram showing a specific example of a voice switching circuit in FIG. 1. FIG. 2 is a block configuration diagram showing a specific example of a pseudo stereo sound generation circuit in FIG. 1. It is a block block diagram which shows one specific example of the 3D audio | voice production | generation circuit in FIG. Is a perspective view showing a specific example of the arrangement of the speakers 14 ₁ to 14 _N in the image display device in FIG. Left speaker 14L ₁ ～14L ₄ viewed from the front of the image display unit 4 in Fig. 1 is a front view showing the placement of the right speaker 14R ₁ ~14R _4. FIG. 2 is a circuit diagram showing a specific example of a distribution processing circuit 13 in FIG. 1. It is a figure which shows one specific example of the relationship between the motion vector a in FIG. 1, FIG. It is a front view which shows the specific example of arrangement | positioning of the speaker in a different type of video display apparatus from the video display apparatus shown in FIG. Is a diagram showing a specific example of a menu screen on-screen display for the volume adjustment of the speaker _{14L 1 ~14L 4, 14R 1 ~14R} 4 ( output level setting). Is a diagram showing a specific example of a menu screen on-screen display for adjusting the characteristics of the speaker _{14L 1 ~14L 4, 14R 1 ~14R} 4 equalizer 21L ₁ ~21L ₄ against, 24R ₁ ~21R _4. It is a diagram showing a specific example of a menu screen on-screen display for the speaker _{14L 1 ~14L 4, 14R 1 ~14R} 4 speaker function setting.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a video display device using a first embodiment of an audio output device according to the present invention, in which 1 is a video signal processing block, 2 is a video processing unit, 3 is a motion vector detection circuit, 4 is a video display unit, 5 is a sound reproduction apparatus of the first embodiment, 6 is a CPU (Central Processing Unit), 7 is a sound switching circuit, 8 is a monaural sound circuit, 9 is a stereo sound circuit, 10 is a pseudo stereo sound generation circuit, 11 is a 3D (three-dimensional) sound generation circuit, 12 is a selector switch, 12a and 12b are changeover switches, 13 is a distribution processing circuit, and 14 _{1 to} 14 _N are speakers.

  In the figure, a video signal processing block 1 and a video display unit 4 constitute a video unit of a video display device, and an input video signal V input by reception or playback from a recording / playback device is a video. Signal processing is performed in the signal processing block 1 and supplied to the video display unit 4, whereby 2D video or 3D video is displayed on the video display unit 4. The audio output device 5 of the first embodiment is provided in such a video display device. Here, the input video signal V is also a 2D video signal, there is also a 3D video signal, and when it is a 2D video signal, a 2D video is displayed on the video display unit 4 and when it is a 3D video signal, a video display unit is displayed. 4 displays a 3D image.

  An audio signal is added to the input video signal V input by reception or reproduction from a recording / reproducing apparatus, and this is input as the input audio signal A to the audio output apparatus 5 of the first embodiment. Here, the input audio signal A is composed of a 2-channel audio signal, and when the input audio signal A is a monaural audio signal, these audio signals are the same audio signal. This input monaural audio signal A is hereinafter referred to as a monaural audio signal M (L + R). When the input audio signal A is a stereo audio signal, the audio signal of one channel is the left audio signal SL, and the audio signal of the other channel is the right audio signal SR. Hereinafter, the input stereo audio signal A is referred to as a stereo audio signal (SL + SR). The monaural audio signal M (L + R) and the stereo audio signal (SL + SR) are collectively referred to as an input audio signal A.

  The input audio signal A is supplied to the audio switching circuit 7, monaural audio circuit 8, and stereo audio circuit 9.

  The voice switching circuit 7 detects a level difference between the two channels of the voice signal as the input voice signal A, integrates the level difference for each predetermined period, compares the integrated value with a prescribed threshold value, and inputs the input voice signal A. 2 is a monaural audio signal M (L + R) or a stereo audio signal (SL + SR), and one specific example is shown in FIG.

  In the figure, the input audio signal A is supplied to the subtracting circuit 7a, and the subtracting circuit 7a subtracts the audio signal of the other channel from the audio signal of one channel of the input audio signal A. These level differences are detected. This level difference is supplied to the integration circuit 7b and integrated by a predetermined constant integration period, and the integration value of the level difference is supplied to the comparator 7c every time this integration period elapses and is set in advance as a reference. Compared with the value 7d. The comparison result b is supplied to the CPU 6 (FIG. 1) as the control means.

  Therefore, when the input audio signal A is a monaural audio signal M (L + R), the audio signal ML of one channel and the audio signal MR of the other channel are the same audio signal. The level difference between the signals ML and MR is almost zero, and the integrated value obtained by integrating it for a predetermined period is almost zero. Accordingly, the integration value is less than the reference value 7d, and the comparison result b (for example, data of “0”) indicating that the integration value is less than the reference value 7d is supplied to the CPU 6. Are determined to be monaural audio signals M (L + R). When the input audio signal A is a stereo audio signal (SL + SR), the audio signal SL of one channel is different from the audio signal SR of the other channel. The level difference is not zero, and the integral value obtained by integrating it for a predetermined period is not zero. Accordingly, the integration value is not less than the reference value 7d, and the comparison result b (for example, “1” data) indicating that the integration value is not less than the reference value 7d is supplied to the CPU 6, so that the CPU 6 at this time Is determined to be a stereo audio signal (SL + SR).

  Returning to FIG. 1, the CPU 6 controls the selector switch 12 based on the determination result. When the input audio signal A is the monaural audio signal M (L + R), the selector switch 12 is changed over. 12a is moved to a movable state, and switch 12b is moved to a non-movable state. When the input audio signal A is a stereo audio signal (SL + SR), the selector switch 12 is set to the movable switch 12b and the selector switch 12a is set to the non-movable state.

In the video signal processing block 1, the motion vector a is detected by the motion vector detection circuit 3 and supplied to the CPU 6 in the process of processing the input video signal V by the video processing unit 2. The CPU 6 controls an amplifier and a switch (not shown) for each of the speakers 14 _{1 to} 14 _N in the distribution processing circuit 13 according to the motion vector a.

  Here, the motion vector detection circuit 3 takes a matching with the previous frame for each frame of the input video signal V, and moves in a direction across the screen within a predetermined search range. For example, a partial image of a moving vehicle or a partial image with movement in the direction from the back to the front of the screen or in the opposite direction is detected, and the detected motion is detected by matching between two frames. A motion amount (represented by the number of pixels) and a motion direction of a video are detected and a motion vector a composed of the motion amount and the motion direction is generated. The detection of the motion vector a is used for frame rate conversion for converting the number of frames per second, interlace / progressive conversion which is conversion between interlaced scanning and sequential scanning, video compression processing, and the like. The motion vector is determined from the degree of coincidence calculated for each motion vector candidate vector set within the search range. As the degree of coincidence, a summed absolute difference (SAD) is generally used.

  In this motion vector detection, the video signal is supplied to the motion vector detection circuit 3 to detect the direction of motion of the video between two frames, and at the same time, the motion direction of the video in the screen is mapped. This detection information can be output in a plurality of bits as a motion vector a representing the motion direction of the video signal. Note that the communication means of the motion vector a from the motion vector detection circuit 3 to the CPU 6 may be a communication means such as parallel or serial I2C (Inter-Integrated Circuit).

  The video signal processing block 1 that processes the input video signal V, for example, outputs a three-dimensional video on the time axis with respect to the left-eye video and the right-eye video, that is, the original video signal. One image is composed of the other image that is delayed (or advanced) by several fields, and these images are out of phase with each other in the horizontal direction. The field delay (or advance) amount and phase shift amount are information for determining the phase shift control amount for the pseudo-stereo or pseudo-stereoization of the sound. Based on these information, the motion vector detection circuit 3 maps the motion direction reflecting the phase shift amount of the video, and detects the motion vector a representing the motion direction and the motion amount of the video together with the information. is there.

On the other hand, the monaural audio signal M (L + R) as the input audio signal A is subjected to processing such as amplification in the monaural audio circuit 8, and then supplied to _one terminal a1 of the switch 12a in the selector switch 12, The pseudo stereo sound generation circuit 10 is supplied. In the pseudo stereo audio generation circuit 10, a pseudo stereo audio signal (SL _M + SR _M ) is generated from the supplied monaural audio signal M (L + R) and supplied to the other terminal a ₂ of the switch 12 a in the selector switch 12. .

This pseudo stereo audio generation circuit 10 generates a pseudo stereo audio signal (SL _M + SR _M ) that can obtain a sound field with a sense of spreading left and right and popping out to the front. One example is shown in FIG. An example is shown.

In FIG. 3, the monaural audio signal M (L + R) is input by inputting one of the audio signals ML + MR of the two channels or by adding these signals (this signal is hereinafter referred to as the monaural audio signal M). The BPF 10b and the HPF 10c are divided into three bands, a low band, a mid band, and a high band, and the low band audio signal M _L , the mid band audio signal M _B , and the high band audio signal _{MH respectively} Delay is performed by delay circuits 10d ₁ , 10d ₂ , and 10d ₃ for adjusting the feeling of spreading.

Audio signal M _L of the low band from the delay circuit 10d _1, after being multiplied processed by the multiplier 10e ₁ for adjusting the sense jumping out in the front direction of the sound, the adder 10 g ₁ low pass from LPF10a is added to the audio signal M _L, also, the sound signal M _L of the low band from the delay circuit 10d _1, after being multiplied processed by the multiplier 10f ₁ for adjusting the sense jumping out in the front direction of the sound, the subtracter subtracting the audio signal M _L of the low band from LPF10a at 10h _1.

Similarly, the audio signal M _B midrange from the delay circuit 10d _2, after being multiplied processed by the multiplier 10e ₂ for adjusting the sense jumping out in the front direction of the sound, from BPF10b the adder 10 g ₂ is added to the audio signal M _B midrange, also, the sound signal M _B midrange from the delay circuit 10d _2, after being multiplied processed by the multiplier 10f ₂ for adjusting the sense jumping out in the front direction of the sound , it subtracts the voice signal M _B midrange from BPF10b subtracter 10h _2.

Further, the high frequency audio signal _MH from the delay circuit 10d ₃ is multiplied by the multiplier 10e ₃ for adjusting the forward sound feeling of the sound, and then added to the high frequency from the HPF 10c by the adder 10g _3. is the audio signal M _H addition, also the audio signal M _H high frequency from the delay circuit 10d _3, after being multiplied processed by the multiplier 10f ₃ for adjusting the sense jumping out in the front direction of the sound, subtraction subtracting the audio signal M _H in the high range from BPF10c in vessel 10h _3.

Further, the audio signals from the adders 10g ₁ , 10g ₂ , and 10g ₃ are added by the adder 10i ₁ , thereby generating the left audio signal SL _M of the pseudo stereo audio signal (SL _M + SR _M ), the audio signal from the adder 10h _1, 10h _2, 10h ₃ are added by an adder 10i _2, thereby, right audio signal SR _M pseudo stereo audio signal (SL _M + SR _M) is generated.

In this way, a pseudo stereo audio signal (SL _M + SR _M ) is generated and supplied to the terminal a ₂ of the switch 12a in the selector switch 12 in FIG.

Returning to FIG. 1, the stereo audio signal (SL + SR) as the input audio signal A is subjected to processing such as amplification in the stereo audio circuit 9 and then supplied to _one terminal b ₁ of the switch 12 b in the selector switch 12. And supplied to the 3D sound generation circuit 11. In the 3D sound generation circuit 11, a 3D (three-dimensional) sound signal (SL _3D + SR _3D ) is generated from the supplied stereo sound signal (SL + SR), and is supplied to the other terminal b ₂ of the switch 12 b in the selector switch 12. The

The 3D sound generation circuit 11 generates a 3D sound signal (SL _3D + SR _3D ) that can produce a sound field with a sense of spreading left and right and popping out to the front. One specific example is shown in FIG. Show.

In FIG. 4, the left audio signal SL of the input stereo audio signal (SL + SR) is supplied to the adders 11f ₁ and 11b, and is supplied to the BPF 11a ₁ to extract a predetermined band, so that the spread in the horizontal direction is sensed. And a multiplier 11d ₁ for adjusting the feeling of popping out in both side directions. The output signal of the multiplier 11d ₁ is supplied to the adder 11f ₁ and added to the input left audio signal SL. Similarly, the input right audio signal SR of the stereo audio signal (SL + SR) is supplied to the adders 11f ₂ and 11b, and is also supplied to the BPF 11a ₂ to extract a predetermined band, so that a sense of spread in the horizontal direction is obtained. And a multiplier 11d ₂ for adjusting the protruding feeling in both side directions. The output signal of the multiplier 11d ₂ is supplied to the adder 11f ₂ and added to the input right audio signal SR.

In the adder 11b, the left audio signal SL and the right audio signal SR of the input stereo audio signal (SL + SR) are added, and this added signal is supplied to the BPF 11c, and a predetermined band is extracted, and a feeling of popping out in the writing direction is obtained. Is supplied to a multiplier 11e for adjusting. The output signal of the multiplier 11e is supplied to the adder / subtractor 11g ₁ and added to the audio signal from the adder 11f ₁ , and the output signal of the multiplier 11d ₂ is subtracted to obtain a 3D audio signal (SL _3D + SR _3D ) Left audio signal SL _3D is generated. The output signal of the multiplier 11e is supplied to the adder-subtracter 11g ₂ is added to the audio signal from the adder 11f _2, further subtracted output signal of the multiplier 11d ₁ are 3D audio signal (SL _3D + SR _3D ) of the right audio signal SR _3D is generated.

Returning to FIG. 1, the selector 12 controls the switching of the switches 12a and 12b by the control of the CPU 6 by operating a remote controller (not shown). When the input audio signal A is a monaural audio signal M (L + R), the switch 12a is in a movable state under the control of the CPU 6, so that the switch 12a is operated by the user through a remote control operation. L + R) and the pseudo stereo sound signal (SL _M + SR _M ) from the pseudo stereo sound generation circuit 10 are selected and supplied to the distribution processing circuit 13. Further, when the input audio signal A is a stereo audio signal (SL + SR), the switch 12b is in a movable state under the control of the CPU 6, so that the switch 12b is switched from the stereo audio signal (from the stereo audio circuit 9 by a user's remote control operation). SL + SR) and the 3D audio signal (SL _3D + SR _3D ) from the 3D audio generation circuit 11 are selected and supplied to the distribution processing circuit 13.

In the distribution processing circuit 13, one audio signal ML of the monaural audio signal M (L + R) selected by the selector switch 12, the left audio signal SL _{M of} the pseudo stereo audio signal (SL _M + SR _M ), and the stereo audio signal (SL + SR) left audio signal SL, and after the left audio signal SL _3D of 3D audio signal (SL _3D + SR _3D) were processed on the basis of the control signal c in accordance with the motion vector a and a comparison result b from CPU 6, a speaker 14 _{1 to} 14 _N , the right audio signal of the other audio signal MR of the monaural audio signal M (L + R) selected by the selector switch 12 and the pseudo stereo audio signal (SL _M + SR _M ). SR _M, right audio signal SR of the stereo audio signal (SL + SR), the right audio signal SR _3D of the 3D audio signal (SL _3D + SR _3D), vector movement from CPU6 After being processed in accordance with the Le a or comparison result b, it is supplied to the right speaker of the speaker 14 ₁ to 14 _N.

FIG. 5 is a perspective view showing a specific example of the arrangement of the speakers 14 _{1 to} 14 _N in the video display device in FIG. 1, wherein 14 L ₁ to 14 L ₄ are left speakers, 14 R _{1 to} 14 R ₄ are right speakers, 15 Is an LED (light-emitting diode) drive circuit, 16 is a light-emitting diode, 17 is a light guide plate, 18 is a reflection plate, and 19 is a diffusion plate. The parts corresponding to those in FIG. .

  In this figure, this video display device is a liquid crystal display device as an example, and only the backlight portion of the video display unit 4 is shown here. The backlight has a plurality of light emitting diodes 16 arranged in an array. The light emitting diode 16 may be substantially white by combining light emitting diode arrays of three colors of RGB. The light emitting diodes 16 are driven to emit light by the LED driving circuit 15, and the light emitted from the respective light emitting diodes 16 is irradiated to the inside of the light guide plate 17. Here, the diffusion plate 19 is installed on the upper side of the light guide plate 17, and the reflection plate 18 is installed on the lower side. That is, FIG. 5 shows the image display portion facing upward. In this case, the light emitted from the array of light emitting diodes 16 is incident on the light guide plate 17 and propagates in the direction of the surface of the light guide plate 17 and is then reflected and diffused at the boundary surface between the reflection plate 18 and the light guide plate 17. The light is irradiated inside the plate 19 and becomes uniform light in the surface direction, and is emitted as irradiation light to a liquid crystal panel (not shown) provided on the upper side of the diffusion plate 19.

A left speaker 14L ₁ is provided on the left side and a right speaker 14R ₁ is provided on the right side along the lower side of the video display unit 4, and a left speaker 14L ₂ is provided on the lower side along the left side of the video display unit 4. The left speaker 14L ₃ is provided on the upper side. A right speaker 14R ₂ is provided on the lower side along the right side of the video display unit 4 and a right speaker 14R ₃ is provided on the upper side thereof, and a left speaker is provided on the left side along the upper side of the video display unit 4. 14L ₄ is the right speaker 14R ₄ are provided respectively on the right side. In this specific example, eight speakers 14 of four left speakers 14L _{1 to} 14L ₄ and four right speakers 14R _{1 to} 14R ₄ are provided as described above. 1, N = 8), the left speakers 14L _{1 to} 14L ₄ are connected to one audio signal ML of the monaural audio signal M (L + R) selected by the selector switch 12 in FIG. 1 and the pseudo stereo audio signal (SL _M + SR _M ) Left audio signal SL _M , stereo audio signal (SL + SR) left audio signal SL, or 3D audio signal (SL _3D + SR _3D ) left audio signal SL _3D is supplied to function as a left speaker, and right speaker 14R ₁ To 14R ₄ , the other sound signal MR of the monaural sound signal M (L + R) selected by the selector switch 12 in FIG. 1 and the right sound of the pseudo stereo sound signal (SL _M + SR _M ) Voice signal SR _M, stereo audio signal (SL + SR) right audio signal SR _3D right audio signal SR or 3D audio signal (SL _3D + SR _3D) is supplied, and functions as a right speaker.

  Here, the speaker 14 arranged on the left side from the center of the video display unit 4 is called a left speaker, and the speaker 14 arranged on the right side is called a right speaker. The speaker 14 that functions to output the left sound when the left audio signal is supplied is referred to as a left speaker, and the speaker 14 that functions to output the right sound when the right audio signal is supplied. This is called the right speaker.

Figure 6 is a left speaker 14L ₁ ～14L ₄ viewed from the front of the image display unit 4 of FIG. 1, a front view showing the placement of the right speaker 14R ₁ ~14R _4, 4a denotes a display screen, FIG. 5 The parts corresponding to are assigned the same reference numerals, and redundant explanations are omitted.

In the figure, the periphery of the horizontally long display screen 4a of the image display unit 4, along its lower edge, the left speaker 14L ₁ to the left, right speaker 14R ₁ is respectively disposed on the right side, along the left-hand The left speaker 14L ₂ is arranged on the lower side, the left speaker 14L ₃ is arranged on the upper side, the right speaker 14R ₂ is arranged on the lower side along the right side, and the right speaker 14R ₃ is arranged on the upper side, respectively. A left speaker 14L ₄ is arranged on the left side along the upper side, and a right speaker 14R ₄ is arranged on the right side thereof.

As described above, the speakers 14L _{1 to} 14L ₄ and 14R _{1 to} 14R ₄ are integrally provided in the video display device, and their arrangement is fixed with respect to the display screen 4a of the video display unit 4.

FIG. 7 is a circuit diagram showing a specific example of the distribution processing circuit 13 in FIG. 1, in which 20L ₁ to 20L ₄ and 20R _{1 to} 20R ₄ are open / close switches, and 21L _{1 to} 20L ₄ and 21R _{1 to} 21R ₄ are equalizers. , 22L _{1 to} 22L ₄ and 22R _{1 to} 22R ₄ are variable gain amplifiers, and portions corresponding to those in FIGS.

In the figure, the distribution processing circuit 13, the left speaker _{14L 1, 14L 2, 14L 3} , husband 14L ₄ s, closing switch _{20L 1, 20L 2, 20L 3} , 20L 4 and equalizer _{21L 1, 21L 2, 20L 3} , 20L ₄ and variable gain amplifiers 22L ₁ , 22L ₂ , 22L ₃ , 22L ₄ are provided, and the right speakers 14R ₁ , 14R ₂ , 14R ₃ , 14R ₄ are respectively connected to open / close switches 20R ₁ , 20R ₂ , 20R ₃ , 20R ₄ , equalizers 21R ₁ , 21R ₂ , 20R ₃ , 20R ₄ and variable gain amplifiers 22R ₁ , 22R ₂ , 22R ₃ , 22R ₄ are provided.

One audio signal ML of the monaural audio signal M (L + R) selected by the selector switch 12 (FIG. 1), the left audio signal SL _{M of} the pseudo stereo audio signal (SL _M + SR _M ), and the left of the stereo audio signal (SL + SR) The left audio signal SL _{3D of the} audio signal SL or the 3D audio signal (SL _3D + SR _3D ) (hereinafter collectively referred to as the selected left audio signal L) is an open / close switch 20L ₁ , 20L ₂ , 20L ₃ , 20L ₄ , the band is adjusted by the equalizers 21L ₁ , 21L ₂ , 20L ₃ and 20L ₄ , respectively, and then the signal level is adjusted by the variable gain amplifiers 22L ₁ , 22L ₂ , 22L ₃ and 22L ₄ and left The signals are supplied to the speakers 14L ₁ , 14L ₂ , 14L ₃ and 14L ₄ . Accordingly, the left speakers 14L ₁ , 14L ₂ , 14L ₃ , and 14L ₄ function as left speakers that output left audio. Also, the other audio signal MR of the monaural audio signal M (L + R) selected by the selector switch 12 (FIG. 1), the right audio signal SR _{M of} the pseudo stereo audio signal (SL _M + SR _M ), and the stereo audio signal (SL + SR) the right audio signal SR or 3D audio signal (SL _3D + SR _3D) right audio signal SR _3D (hereinafter, these are collectively referred to as the right audio signal R which is selected by the selector switch 12), the opening and closing switch 20R _1, 20R ₂ , 20R ₃ , and 20R ₄ are distributed to the equalizers 21R ₁ , 21R ₂ , 20R ₃ , and 20R ₄ , and then adjusted by the variable gain amplifiers 22R ₁ , 22R ₂ , 22R ₃ , and 22R ₄ . The level is adjusted and supplied to the right speakers 14R ₁ , 14R ₂ , 14R ₃ , 14R ₄ . Accordingly, the right speakers 14R ₁ , 14R ₂ , 14R ₃ , and 14R ₄ function as right speakers that output right sound.

Here, the opening / closing switches 20L _{1 to} 20L ₄ and 20R _{1 to} 20R ₄ are controlled to be opened / closed by a control signal c ₁ corresponding to the comparison result b and the motion vector a from the CPU 6.

That is, when the left audio signal L and the right audio signal R selected by the selector switch 12 are the audio signals ML and MR of the monaural audio signal M (L + R), for example, the open / close switches 20L ₂ , 20L ₃ and 20R _{2 are used.} , 20R ₃ is turned on and the open / close switches L ₁ , L ₄ , R ₁ , R ₄ are turned off, the left audio signal L is supplied to the left speakers 14L ₂ , 14L ₃ , and the right audio signal R is supplied to the right speakers 14R ₂ , 14R _3. Respectively. However, the present invention is not limited to this. For example, all the open / close switches 20L _{1 to} 20L ₄ , 20R _{1 to} 20R ₄ are turned on, and the left audio signal L is supplied to all the left speakers 14L _{1 to} 14L ₄ . The right audio signal R may be supplied to the right speakers 14R _{1 to} 14R ₄ .

Further, the left audio signal L and the right audio signal R selected by the selector switch 12 are the audio signals SL _M and SR _{M of} the pseudo stereo audio signal (SL _M + SR _M ) or the audio signal SL of the stereo audio signal (SL + SM). , SR, when the amount of motion of the video on the 2D screen displayed on the video display unit 4 (FIG. 1) is larger than a predetermined value, the open / close switches 20L _{1 to} 20L ₄ according to the motion of the video. , 20R _{1 to} 20R ₄ are sequentially controlled to be opened and closed, and the audio signal supply timings of the left speakers 14L _{1 to} 14L ₄ and the right speakers 14R _{1 to} 14R ₄ are shifted by a predetermined amount accordingly. That is, the speaker that generates sound is switched in the moving direction of the video in accordance with the movement of the video. At this time, the gains of the variable gain amplifiers 22L _{1 to} 22L ₄ and 22R _{1 to} 22R ₄ are sequentially controlled by the control signal C ₂ from the CPU 6, and the volume is adjusted in the moving direction of the video according to the movement of the video. Changed. As a result, the pseudo stereo audio signal (SL _M + SR _M ) and the stereo audio signal (SL + SR) provide a sense of left and right expansion and a feeling of popping out to the front, and this video is used as a sound source in accordance with the movement of the video. In addition, a sound field in which the sound from the sound source moving in the moving direction can be heard is obtained.

Further, when the left audio signal L and the right audio signal R selected by the selector switch 12 are the audio signals SL _3D and SR _3D of the 3D audio signal (SL _3D + SR _3D ), the video display unit 4 (FIG. 1). When the amount of motion of the video on the 2D screen or 3D screen displayed on the screen is larger than a predetermined value, the open / close switches 20L _{1 to} 20L ₄ and 20R _{1 to} 20R ₄ are sequentially controlled to open / close according to the motion of the video. Accordingly, the audio signal supply timings of the left speakers 14L _{1 to} 14L ₄ and the right speakers 14R _{1 to} 14R ₄ are shifted by a predetermined amount. That is, the speaker that generates sound is switched in the moving direction of the video in accordance with the movement of the video. At this time, the gains of the variable gain amplifiers 22L _{1 to} 22L ₄ and 22R _{1 to} 22R ₄ are sequentially controlled by the control signal C ₂ from the CPU 6, and the volume is adjusted in the moving direction of the video according to the movement of the video. Changed. As a result, a 3D audio signal (SL _3D + SR _3D ) provides a sense of left and right expansion and a sense of popping out to the front, and moves in the moving direction so that this video is used as a sound source in accordance with the movement of the video. A sound field where the sound from the sound source can be heard is obtained.

Incidentally, the audio signals SL of the audio signals SL _M, SR _M and stereo audio signals of the audio signal selected by the selector switch 12 L and the right audio signal R pseudo stereo audio signal _{(SL M + SR M) (} SL + SM), SR The audio signals SL _3D and SR _3D of the 3D audio signal (SL _3D + SR _3D ), and the amount of motion of the video on the 2D screen or 3D screen displayed on the video display unit 4 (FIG. 1) is less than a predetermined value. in some cases, as no video with motion, for example, closing switch 20L ₂ ~20L _3, 20R ₂ only ～20R ₃ is turned on or all off switch _{20L 1 ~20L 4,, 20R 1} ~20R 4 Is turned on, and the gains of all the variable gain amplifiers 22L _{1 to} L ₄ and 22R _{1 to} 22R ₄ are set to predetermined values.

FIG. 8 is a diagram illustrating a specific example of the relationship between the motion vector a and the operation of the speaker 14 in FIGS. 1 and 5, wherein 23 is a motion image, 24 is an arrow, and 25 is a display area. Parts corresponding to those in the previous drawings are assigned the same reference numerals and redundant description is omitted. Here, the left speakers 14L _{1 to} 14L ₄ and the right speakers 14R _{1 to} 14R ₄ are collectively referred to as the speaker 14.

  FIG. 8A shows the movement of the motion image 23 on the display screen 4a. Here, as an example, the image 23 of a locomotive or the like is displayed on the display screen 4a from the left side to the right side as shown in the figure. Assume that it is moving. Here, the motion image 23 is an image that moves larger than a predetermined amount of movement.

  As shown in FIG. 8B, the motion vector detection circuit 3 in FIG. 1 assumes a horizontally long display area 25 corresponding to the display screen 4a, generates a motion vector a from the motion of the motion video 23, and displays this display. This motion vector a is mapped on the area 25. As described above, the motion vector a is detected by comparing the current frame with the previous frame. In this mapping, the motion video 23 in the previous frame is used. The motion vector a is represented by an arrow having a magnitude corresponding to the amount of motion from the position and pointing in the direction of motion.

  The display area 25 is divided into a plurality of partial areas with respect to the display screen 4a, for example, according to the arrangement relationship of the speakers 14 as shown in FIG. Here, in FIG. 6, since two speakers 14 are arranged on each side of the horizontally long display screen 4a, the display area 25 is divided into three in both the vertical and horizontal directions, and nine divided areas A, B, C,..., H, I are assumed. From the positional relationship of the motion vector a with respect to the divided areas A to I, the switching order of the speakers 14 that generate sound is set.

  Here, the motion vector a reaches the boundary between the partial areas F and I from the boundary between the partial areas D and G, as shown in the figure, but the motion image 23 exists at the boundary between the partial areas D and G. This position is detected from the motion vector a.

Therefore, as shown in FIG. 8 (c), assuming the position of the speakers 14 against the display area 25, the left speaker 14L ₁ to the left along the lower edge of the display area 25, the right speaker to the right 14R ₁ is arranged, the left speaker 14L ₂ is arranged on the lower side along the left side, the left speaker 14L ₃ is arranged on the upper side, and the right speaker 14R ₂ is arranged on the lower side along the right side. The right speaker 14R ₃ is arranged, the left speaker 14L ₄ is arranged on the left side along the upper side, and the right speaker 14R ₄ is arranged on the right side.

  With such an arrangement of the speakers 14, the operating speakers 14 differ depending on whether the position of the motion video 23 is in any of the partial areas A to I of the display area 25. An example of this will be described below.

(1) As an example, when the motion video 23 is in the partial area A, the left speaker 14L ₃ on the left side of the display area 25 and the left speaker 14L ₄ on the upper side operate.
When in the partial area B, the left speaker 14L ₄ and the right speaker 14R ₄ on the upper side of the display area 25 operate,
When in the partial area C, the right speaker 14R ₃ on the right side of the display area 25 and the right speaker 14R ₄ on the upper side operate.

When the motion image 23 is in the partial area D, the left speakers 14L ₂ and 14L ₃ on the left side of the display area 25 and the left speaker 14L ₄ on the upper side operate.
When in the partial area E, the left speakers 14L ₁ and 14R ₁ on the lower side of the display area 25, the left speaker 14L ₄ and the right speaker 14R ₄ on the upper side operate.
When in the partial area F, the right speakers 14R ₂ and 14R ₃ on the right side of the display area 25, the right speaker 14R ₁ on the lower side, and the right speaker 14R ₄ on the upper side operate.

Furthermore, when the motion image 23 is in the partial area G, the left speaker 14L ₂ on the left side of the display area 25 and the left speaker 14L ₁ on the lower side operate,
When in the partial area H, the left speaker 14L ₁ and the right speaker 14R ₁ on the lower side of the display area 25 operate,
When in the partial area I, the right speaker 14R ₂ on the right side of the display area 25 and the right speaker 14R ₁ on the lower side operate.

(2) As another example, when the motion image 23 is in the upper half of the partial area A or the partial area D, the left speaker 14L ₃ on the left side of the display area 25 and the left speaker 14L ₄ on the upper side operate.
When in the upper half of the partial area B or the partial area E, the left speaker 14L ₄ and the right speaker 14R ₄ on the upper side of the display area 25 operate,
When in the upper half of the partial area C or the partial area F, the right speaker 14R ₃ on the right side of the display area 25 and the right speaker 14R ₄ on the upper side operate.

When the motion video 23 is in the lower half of the partial area D or in the partial area G, the left speaker 14L ₂ on the left side of the display area 25 and the left speaker 14L ₁ on the lower side operate.
When in the lower half or partial area H of the partial area E, the left speaker 14L ₁ and the right speaker 14R ₁ on the lower side of the display area 25 operate,
When in the lower half or partial area I of the partial area F, the right speaker 14R ₂ on the right side of the display area 25 and the right speaker 14R ₁ on the lower side operate.

Here, “speaker 14 operates” means a state in which an audio signal is supplied to speaker 14 to generate sound. At this time, switch 20 (corresponding to speaker 14 shown in FIG. The switches 20L _{1 to} 20L ₄ and 20R _{1 to} 20R ₄ are generically named, and the same applies to the corresponding variable gain amplifier 21 (variable gain amplifiers 22L _{1 to} 22L ₄ , 22R _{1 to} 22R _4). (The same applies hereinafter) is controlled.

When the motion image 23 has a large amount of motion and the motion vector a is large, the operating speaker 14 is sequentially switched as the motion image 23 moves, but the motion amount of the motion image 23 is predetermined. If the moving image 23 is smaller than the value, or there is no moving image 23, but the movement is slow, as described above, the left speakers 14L ₂ and 14L ₃ and the right speakers 14R ₂ and 14R ₃ The speaker 14 operates.

Therefore, the amount of motion of the motion video 23 is large, and a large movement vector a is detected as shown in FIG. 8C, and the motion video 23 is moved from the position on the boundary between the partial areas D and G to the partial areas E, Assume that the position moves to the position on the boundary of H and the position on the boundary of partial areas F and I, and will be described based on the above “example of (1)” (however, the boundary lines of partial areas A and D) As in the partial area A, the upper boundary line belongs to the upper partial area, and the lower boundary line as in the partial area D and G, as in the partial area G. In FIG. 7, when the motion video 23 moves on the boundary between the partial areas D and G, the switches 20L ₁ and 20L ₂ are on, and the selector switch 12 The left audio signal L selected in FIG. It is supplied to the L _1, 14L _2. At this time, along with the motion picture 23 moves the display area 25 on the right, along with the gain of the variable gain amplifier 22L ₁ for the left speaker 14L ₁ is controlled to rise, the variable gain amplifier 22L for the left speaker 14L ₂ The gain of ₂ is controlled to decrease.

In this case, in FIG. 8A, assuming that the motion video 24 is moving only in the right direction, the variable gain amplifier 22L so that the total output volume of the left speakers 14L ₁ and 14L ₂ increases. The gains ₁ and 22L ₂ are controlled.

If the moving image 23 is further moved toward the front side (that is, the direction approaching the user), the gain of the variable gain amplifier 22L _{1 with} respect to the left speaker 14L ₁ is rapidly increased, and FIG. ), The total output volume of the left speakers 14L ₁ and 14L ₂ is further increased. Of course, when the moving image 23 is also moving in the direction opposite to the front side, that is, in the depth direction, the gain of the variable gain amplifier 22L ₁ is gradually decreased, and the left speakers 14L ₁ and 14L ₂ Make the total output volume decrease.

As the moving image 23 moves and approaches the boundary line between the partial areas E and H, the variable gain amplifiers 22L ₁ and 22L ₂ increase so that the total output volume of the left speakers 14L ₁ and 14L ₂ increases. Gain is controlled. When the motion image 23 reaches the boundary line between the partial areas E and H (which may be slightly before the boundary line is reached), the switch 20L ₂ is turned off and the left speaker 14L ₂ stops operating, At the same time, the switch 20R ₁ is turned on, and the right speaker 14R ₁ starts operating. In this case, the variable gain amplifiers 22L ₁ and 22L are set so that the total output volume of the left speaker 14L ₁ and the right speaker 14R ₁ that has started operation becomes equal to the total output volume of the left speakers 14L ₁ and 14L ₂ at that time. gain of the variable gain amplifier 22R ₁ is set for a gain of _two.

Thereafter, the variable gain amplifier 22L ₁ is further increased so that the total output volume of the left speaker 14L ₁ and the right speaker 14R ₁ is further increased as the moving image 23 moves in the right direction on the boundary line between the partial areas E and H. the gain is constant, so that the gain of the variable gain amplifier 22R ₁ increases, the gain of each is controlled. When the motion image 23 reaches the center point of the boundary line between the partial areas E and H, the gain of the variable gain amplifier 22L _{1 and} the gain of the variable gain amplifier 22R ₁ are made equal, and then the variable gain amplifier 22R. ₁ gain is constant, the gain of each is controlled so that the gain of the variable gain amplifier 22L ₁ is decreased, the total output volume of the left speaker 14L ₁ and the right speaker 14R ₁ decreases.

As described above, assuming that the motion image 23 is also moving toward the front side (that is, the direction approaching the user), the gain of the variable gain amplifier 22R _{1 with} respect to the right speaker 14R ₁ is rapidly increased. As shown in FIG. 8D, the total output volume of the left speaker 14L ₁ and the right speaker 14R ₁ is increased.

When the moving image 23 moves and reaches the boundary line of the next partial areas F and I (may be slightly before the boundary line is reached), the switch 20L ₁ is turned off and the left speaker 14L ₁ stops operating. At the same time, the switch 20R ₂ is turned on and the right speaker 14R ₂ starts operating. In this case, the variable gain amplifiers 22L ₁ and 22R ₁ are set so that the total output volume of the right speaker 14R ₁ and the right speaker 14R ₂ is equal to the total output volume of the left speaker 14L ₁ and the right speaker 14R _{1 at} that time. gain of the variable gain amplifier 22R ₂ is set for the gain.

The gain of the variable gain amplifier 22R ₁ is adjusted so that the total output volume with the right speakers 14R ₁ and R ₂ gradually decreases as the movement image 23 moves rightward on the boundary line between the partial areas F and I. while gradually reducing the increase the gain of the variable gain amplifier 22R _2.

As described above, assuming that the motion image 23 is also moving toward the front side (that is, the direction approaching the user), the gain of the variable gain amplifier 22R _{2 with} respect to the right speaker 14R ₂ is rapidly increased. As shown in FIG. 8D, the total output volume of the right speakers 14R ₁ and 14R ₂ is increased.

Thus, as the motion video 23 moves, the speaker 14 operating from the left speakers 14L ₁ , 14L ₂ to the left speaker 14L _{1, the} right speaker 14R ₁ , and the right speakers 14R ₁ , 14R ₂ Together with this, the sound field in which the sound source moves together with the movement of the motion image 23 is obtained.

In particular, when the pseudo stereo sound signal (SL _M + SR _M ) generated by the pseudo stereo sound generation circuit 8 is supplied to the speaker as described above, this is a feeling of spreading the horizontal sound field or popping out in the front direction. In addition, when the 3D audio signal (SL _3D + SR _3D ) generated by the 3D audio generation circuit 11 is supplied to the speaker as described above, this is the horizontal direction. Since the sound field expands, projects forward, and both sides project, the sound field in which the sound source moves can be obtained more effectively. Become.

  In the above description, the total output volume of the speaker 14 that operates as the moving image 23 moves in the left-right direction changes. However, the total output volume may always be constant. In this case, the gain of the speaker 14 that operates simultaneously may be kept constant.

  8A to 8C, the moving image 23 moves along a path from the boundary lines of the partial areas D and G to the boundary lines of the partial areas F and I through the boundary lines of the partial areas E and H. The switching of the speaker 14 at that time has been described, but when moving along another route, the same applies based on the above “(1) example” and “(2) example”. The speaker 14 is switched.

For example, when the motion video 23 moves along a route from the partial area A to the partial area C through the partial area B, the operating speaker 14 is changed from the left speaker 14L ₃ , 14L ₄ to the left speaker L ₄ / right speaker. R ₄ is switched to the right speakers 14R ₃ and 14R ₄ , and the moving image 23 moves along the path from the back side to the near side from the partial area A through the partial area E to the partial area I. The operating speakers 14 are switched from the left speakers 14L ₃ and 14L ₄ to the left speakers 14L ₁ and L ₄ / the right speakers 14R ₁ and 14R ₄ and the right speakers 14R ₃ and 14R ₄ . In this case, the total output volume from the operating speaker 14 gradually increases as the moving image 23 moves.

FIG. 9 is a front view showing a specific example of the arrangement of the speakers 14 in a video display device of a type different from the video display device shown in FIG. 6, where 4 _LD is the lower left side, 4 _RD is the lower right side, and 4 _LU is The upper left side, 4 _RU is the upper right side, and parts corresponding to those in the previous drawings are given the same reference numerals and redundant description is omitted.

9 (a) is a display screen 4a is vertically long image display device of the image display unit 4, a left speaker 14L ₁ and the right speaker 14R ₁ along the lower side of the display screen 4a is disposed on the left and right, left The left speakers 14L ₃ and 14L ₂ are vertically arranged along the right side, the right speakers 14R ₃ and 14R ₂ are vertically arranged along the right side, and the left speaker 14L ₄ and the right speaker 14R ₄ are horizontally arranged along the top side. Has been placed. These left speaker 14L ₁ ~14L _4, which form a function of the same left speaker and the left speaker 14L ₁ ~14L ₄ in FIG. 6, right speaker 14R ₁ of the right speaker 14R ₁ ~14R ₄ in FIG. 6 those forming a function of the same right speaker as ~14R _4.

  The configuration shown in FIGS. 1, 5 and 7 and the functions and operations shown in FIG. 8 are the same in this specific example.

  As described above, in the first embodiment, even if the number of speakers 14 is large, the speaker 14 is connected to the video display unit 4 shown in FIG. The display screen 4a can be arranged in the same manner as a horizontally long video display device, and the same effect can be obtained. Therefore, the positioning of each speaker 14 is uniquely determined, and its function (operation, equalizer, variable gain amplifier characteristics, etc.) is uniquely determined by this installation position, and the display screen 4a is horizontally long. In the design process and the production process of the video display device or the video display device having a vertically long display screen 4a, there is no need to consider the arrangement and function of the speakers for each video display device.

FIG. 9B is a video display device used for digital signage (digital signage) for displaying advertising content and the like, and the display screen 4a of the video display unit 4 has a diamond shape. The display screen 4a of diamonds but has a lower left side 4 _LD and the right lower side 4 _RD and left upper sides 4 _LU and the right upper side 4 _RU, oblong display screen 4a and 9 shown in FIG. 6 (a) The vertically long display screen 4a shown in FIG.

Here, in the lower left side 4 _LD , the left speaker 14L ₁ is disposed on the lower side, and the left speaker 14L ₂ is disposed on the upper side, and on the upper left side 4 _LU , the left speaker 14L ₃ is disposed on the lower side. disposed people left speaker 14L ₄ husband upward, on the right lower side 4 _RD, the right speaker 14R ₁ on its lower side, the right speaker 14R ₂ are respectively arranged on its upper side, the right upper side 4 _RU, the lower The right speaker 14R ₃ is disposed on the upper side, and the right speaker 14R ₄ is disposed on the upper side.

These left speaker 14L ₁ ~14L ₄ are those having a function as the same left speaker and the left speaker 14L ₁ ~14L ₄ in FIG. 6, these right speaker 14R ₁ ~14R ₄ is the right speaker in FIG. 6 14R _{1 to} 14R ₄ have the same function as the right speaker. The configuration shown in FIGS. 1, 5 and 7 and the function and operation shown in FIG. 8 are the same in this specific example.

  As described above, in the first embodiment, even if the number of the speakers 14 is large, the speaker 14 of the video display unit 4 shown in FIG. The display screen 4a can be arranged in correspondence with the horizontally long video display device, and the same effect can be obtained. Therefore, the positioning of each speaker 14 is uniquely determined, and its function (operation, equalizer, variable gain amplifier characteristics, etc.) is uniquely determined by this installation position, and the display screen 4a is horizontally long. In the design process and production process of the video display device, the vertically long video display device, and the rhomboid video display device, it is possible to reduce the trouble of considering the arrangement and functions of the speakers for each video display device.

  In the first embodiment described above, two speakers 14 are provided for each side of the display screen 4 having a horizontally, vertically, and diamond-shaped square shape. However, the present invention is not limited to this. Three or more speakers 14 may be provided in each, and a plurality of speakers 14 are arranged on each side, but the number of speakers 14 arranged on the left and right sides and the upper and lower sides. May be different.

Further, no speaker may be provided on the upper side of the display screen 4a. Accordingly, in the horizontally long video display device shown in FIG. 6, the left speaker 14L ₄ and the right speaker 14R ₄ are not provided on the upper side, and the display screen 4a shown in FIG. Then, the left speaker 14L ₄ and the right speaker 14R ₄ are not provided on the upper side. In the video display device display screen 4a is rhombic as shown in FIG. 9 (b), a left speaker 14L ₄ and right loudspeaker 14R ₄ is not provided. Therefore, the circuit configuration shown in FIG. 7 also corresponds to this.

Incidentally, in this embodiment, a menu screen and on-screen display on the display screen 4a by remote control operation, the variable gain amplifier 22L ₁ ~22L ₄ in FIG. 7, 22R ₁ adjustment setting gain ~22R ₄ (speaker 14L ₁ ~14L _4, 14R ₁ volume adjustment) or ～14R _4, to be able to adjust the characteristics of the equalizer _{21L 1 ~21L 4, 21R 1 ~21R} 4, also, the speaker _{14L 1 ~14L 4, 14R 1 ~14R} 4 Can be set. When various adjustments and settings are made by displaying the menu on the display screen 4a on the screen as described above, for example, the operation of the voice switching circuit 7 is stopped under the control of the CPU 6 in FIG. As a result, the sector switch 12 stops operating, and the sound reproducing device 5 stops operating. The on-screen display of menus for adjusting the volume of the speaker, adjusting the characteristics of the equalizer, and setting the function of the speaker will be described below.

FIG. 10 is a diagram showing a specific example of a menu screen displayed on-screen for volume adjustment (output level setting) of the speakers 14L _{1 to} 14L ₄ and 14R _{1 to} 14R ₄ . (Gain) setting menu, 27 is a level (gain) setting unit, 28 is a level axis, and 29 is a slider.

In the figure, when the display operation of the speaker output level setting menu is performed with the remote controller, the speaker output level setting menu 26 is displayed on the display screen 4a. In the speaker output level setting menu 26, the corresponding level setting unit 27 is displayed at a position facing each speaker 14 for each of the speakers 14L _{1 to} 14L ₄ and 14R _{1 to} 14R ₄ .

Here, the level setting unit 27 of the left speaker 14L ₁ will be described. The level setting unit 27 includes a level (gain) shaft 28 and a slider 29 that extend in the horizontal direction. The slider 29 can be moved along the level axis 28 by moving the cursor 29 in the horizontal direction in a state where the cursor 29 is clicked. Setting the output level level of the left speaker 14L ₁ position of the slider 29 on the level axis 28 (set gain), and the maximum sound output level This setting output levels that can output the left speaker 14L ₁ (maximum gain) It becomes. The control signal c ₂ from the CPU 6 in FIG. 7 changes the gain by maximizing the gain set in this way.

Other speakers, i.e., a same applies to the level setting section 27 for the speaker _{14L 2 ~14L 4, 14R 1 ~14R} 4, by adjusting the position of the slider 29 at the level setting section 27 corresponds to that The set gain of the speaker 14 can be adjusted.

Figure 11 is a a diagram showing a specific example of a menu screen on-screen display for adjusting the characteristics of the equalizer _{21L 1 ~21L 4, 24R 1 ~21R} 4 for speaker _{14L 1 ~14L 4, 14R 1 ~14R} 4 Reference numeral 30 denotes an equalizer characteristic setting menu, and reference numeral 31 denotes a characteristic setting unit. Parts corresponding to those in the previous drawings are given the same reference numerals and redundant description is omitted.

In the figure, when an equalizer characteristic setting menu display operation is performed with the remote controller, an equalizer characteristic setting menu 30 is displayed on the display screen 4a. In the equalizer characteristic setting menu 30, the corresponding characteristic setting unit 31 is displayed at a position facing each speaker 14 for each speaker 14L _{1 to} 14L ₄ , 14R _{1 to} 14R ₄ .

Here, the characteristic setting unit 31 of the left speaker 14L ₁ will be described. The characteristic setting unit 31 divides the band of the audio signal supplied to the left speaker 14L ₁ into a plurality of partial bands. The level is displayed. The characteristics of the equalizer 21L ₁ with respect to the left speaker 14L ₁ are determined by the levels of these partial bands. The level in this band can be changed by matching a cursor (not shown) with a certain band in the characteristic setting unit 31 by remote control operation and moving the cursor up and down in a clicked state. The characteristics of the equalizer 21L ₁ can be adjusted by changing the level in the predetermined band.

Other speakers, i.e., a same applies to the characteristic setting unit 31 for the speaker _{14L 2 ~14L 4, 14R 1 ~14R} 4, by adjusting the level of a predetermined band at the characteristic setting unit 31 corresponds to that The characteristics of the equalizer can be adjusted as desired.

FIG. 12 is a diagram showing a specific example of a menu screen displayed on-screen for speaker function setting of the speaker 14, wherein 32 is a speaker function setting menu, 33 is a speaker function setting unit, and 34 _L is a left speaker function. A setting button, 34 _R is a right speaker function setting button, and 34 _C is a center speaker function setting button. Parts corresponding to those in the previous drawings are given the same reference numerals and redundant description is omitted.

  The “speaker function” means that the speaker operates as the left speaker, the right speaker, or the center speaker. The center speaker is omitted in FIG. 4, but a center audio signal is input. This is a speaker to which this center audio signal is supplied.

In the figure, when a speaker function setting menu display operation is performed with the remote controller, a speaker function setting menu 32 is displayed on the display screen 4a. In the speaker function setting menu 32, the corresponding function setting unit 33 is displayed at a position facing each speaker 14 for each speaker 14L _{1 to} 14L ₄ , 14R _{1 to} 14R ₄ .

Here, the function setting unit 33 of the left speaker 14L ₁ will be described. In the function setting unit 33, a left speaker function setting button 34 _L for setting the function so that the left speaker 14L ₁ functions as a left speaker, A right speaker function setting button 34 _R for setting the left speaker 14L ₁ to function as a right speaker, and a center speaker function setting button 34 _C for setting the function so that the speaker 14L ₁ functions as a center speaker; Is always in a state in which any one of these setting buttons is designated and the speaker 14L ₁ is in a state in which the designated function is set. Either setting button can be selected. In the state illustrated, since the state of the left speaker function setting button 34 _L is selected by the function setting unit 33 of the left speaker 14L _1, the left speaker 14L ₁ is made to function as the left speaker.

Looking for other speakers 14, so that the left speaker 14L ₂ ~14L ₄ are set so as to function as a left speaker, right speaker 14R ₁ ~14R ₄ are set so as to function as a right speaker . When this feature as has been set, the speaker 14 each, as shown in FIG. 4, is connected to the opening and closing switch _{20L 1 ~20L 4, 20R 1 ~20R} 4, as described with reference to FIG. 5 Operate.

When the function of each speaker 14 is designated in the speaker function setting menu 32, each speaker 14L _{1 to} 14L ₄ , 14R _{1 to} 14R ₄ and the open / close switch 20L ₁ to 20L ₁ to The connection relationship with L ₄ and 20R _{1 to} 20R ₄ is set. In an extreme example, for example, in FIG. 12, it is assumed that the right speaker function setting button 34 _R is designated for the left speaker 14L _{2 and the} left speaker function setting button 34 _L is designated for the right speaker 14R ₂ . 4, the left speaker 14L ₂ is connected to the open / close switch 20R ₂ and functions as a right speaker, and the right speaker 14R ₂ is connected to the open / close switch 20L ₂ and functions as a left speaker.

When a center audio signal is input, the speaker 14 can be caused to function as a center speaker by designating the center speaker function setting button 34 _C in the function setting unit 33 of the speaker 14 that is desired to function as a center speaker. . 1 and 7 do not show a circuit configuration for the center audio signal, but when the input audio signal A includes the center audio signal, the center audio signal is distributed via the selector switch 12 or directly. It is supplied to the circuit 13 and supplied to the center speaker. For example, the left speaker 14L ₁ and the right speaker 14R ₁ can be operated as the center speaker by designating the center speaker function setting button 34 _C in the function setting unit 33 of the left speaker 14L ₁ and the right speaker 14R _1. it can.

  In this way, by displaying the speaker function setting menu 32 on the display screen 4a, the function of each speaker 14 can be confirmed, and the function is set to the speaker 14 for which an incorrect function is set. It can be corrected by a simple screen operation, and the function of each speaker 14 can be set according to the user's preference.

DESCRIPTION OF SYMBOLS 1 Video signal processing block 2 Video processing part 3 Motion vector detection circuit 4 Video display part 4a Display screen 5 Audio | voice reproduction apparatus 6 CPU
7 audio switching circuit 8 monaural audio circuit 9 stereo audio circuit 10 pseudo-stereo audio generation circuit 11 3D audio generation circuit 12 selector switch 12a, 12b changeover switch 13 distribution processing circuit 14L _{1 to} 14L ₄ left speaker 14R _{1 to} 14R ₄ right speaker 20L _{1 ~20L 4,} 20R _{1 ~20R 4} close switch _{21L 1 ~20L 4, 21R 1 ~21R} 4 equalizer _{22L 1 ~22L 4, 22R 1 ~22R} 4 variable gain amplifier 23 motion picture 25 display area 26 loudspeaker output level (gain ) Setting menu 27 Level (gain) setting part 28 Level axis 29 Slider 30 Equalizer characteristic setting menu 31 Characteristic setting part 32 Speaker function setting menu 33 Speaker function setting part 34 _L Left speaker function setting button 34 _R Right speaker function setting button 34 _C Center speaker function setting button

Claims (5)

An audio output device of a video display device capable of displaying 3D video,
A plurality of speakers are arranged along each of the sides of the display screen of the video display device,
The sound of the three-dimensional image is characterized by controlling the operation of the speaker at each side according to the movement of the moving image on the display screen and changing the sound field in conjunction with the movement of the moving image. Field forming device. In claim 1,
The three-dimensional video sound field forming apparatus according to claim 1, wherein the display screen has a rectangular shape, and the sides on which the speakers are arranged are a left side, a right side, and a lower side of the display screen. In claim 1,
The three-dimensional video sound field forming apparatus according to claim 1, wherein the display screen has a rectangular shape, and the sides on which the speakers are arranged are all sides of the display screen. In claim 1,
The three-dimensional video sound field forming apparatus, wherein the display screen has a rhombus shape, and the sides on which the speakers are arranged are all sides of the display screen. In any one of Claims 1-4,
Motion vector detecting means for detecting a motion vector of the motion video of a video signal input to the video display device;
Control means for detecting a motion of the motion video on the display screen from the motion vector;
Switching the speaker that distributes and supplies the audio signal in conjunction with the detected movement of the motion video, and distribution processing means that adjusts the audio signal distributed and supplied to the speaker; An apparatus for forming a sound field of a three-dimensional image, characterized by forming a sound field that changes in conjunction with the movement of a moving image.

Images