JP2951188B2 - 3D sound field formation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a three-dimensional sound field.

[0002]

2. Description of the Related Art In the past, acoustic signals have changed from two-dimensional to three-dimensional from past monaural signals to stereo signals. However, also for this stereo signal, a two-channel sound signal is distributed to left and right speakers and reproduced, and the sound effect is planar.

In recent years, surround systems have become popular, and seemingly stereophonic sound has come into the ears of listeners. However, even with this surround system, the sound that moves to the left and right can be reproduced, but the effect is close to two-dimensional, and the sound approaching from the back can be expressed only by the strength of the sound, matching with the image There was a problem that it could not be removed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a method for effectively forming a three-dimensional three-dimensional sound field from a stereo sound signal. .

[0005]

A three-dimensional sound field forming method according to the present invention.
The method is that two or more main audio signals on the left and right and these main audio signals
And two or more sub audio signals created from the difference signal
Output audio signals to speakers in response to video movement.
Detecting the motion vector in the video
And if no motion vector is detected in the step,
In the case, the steps of generating all the same sub audio signals,
All the sub audio signals created in the
Signal with a predetermined delay on the time axis from the
And outputting the motion vector.
If a motion vector is detected in the
The sub audio signal corresponding to the magnitude of the motion vector
And the sub-audio signal generated in the step.
The amount of delay on the time axis from the main audio signal of the
The motion vector detected in the step of detecting the motion vector
Calculate and delay according to the torque and output to the speaker
And step.

Further , the sound field forming method of the present invention includes the step of
The motion vector is detected in the vector detection step.
Step to drive the body sonic system if
Is further provided.

In the first and second aspects of the present invention, it is desirable that the body sonic system be driven by detecting a moving image. The video signal in this case may be a three-dimensional video signal or a two-dimensional video signal.

[0008]

According to the present invention, a body sonic system is driven in response to a moving sound signal to provide a powerful sound matched to a video to a listener.

Further, the sound field is expanded by the main sound signal and the sub sound signal, and the sense of reality is increased. The above effect can be expected not only for a three-dimensional video but also for a two-dimensional video, a stereoscopic effect by audio or a synergistic stereoscopic effect by vibration of the audio and the body sonic system.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for forming a three-dimensional sound field according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual diagram showing a hardware configuration for realizing the method. In FIG.
Is a video signal, which may be a two-dimensional video or a three-dimensional video. In the video signal 1, the image data of the current frame and the image data of the immediately preceding frame are compared in frame units, and the motion vector detection circuit 2 detects the motion vector.

The output of the motion vector detection circuit 2 is obtained from the left and right input audio signals L3 and R4 from the sub audio signal (LR).
5, an arithmetic circuit 7 for generating (l-r) 6 and a delay amount on the time axis with respect to the input audio signals 3 and 4 of the sub-audio signals (LR) 5 and (l-r) 6. It is supplied to a control circuit 8 for adjustment and is controlled by the disparity information obtained by the motion vector detection circuit 2.

Reference numeral 9 denotes a delay circuit, which is a sub-audio signal (L
-R) 5 and (l-r) 6 are independently delayed by a control signal from the control circuit 8 with respect to left and right main audio signals L11 and R12 described later.

Reference numeral 10 denotes a first audio distributor which receives the main audio signals L11 and R12 which have passed through the arithmetic circuit, distributes the main audio signals L11 and R12 to a plurality of left audio signals L1 to LN ( N is a natural number), right audio signals R1 to RN
(N is a natural number).

The left and right audio signals L1 to LN-1, R
To R N -1 are amplifiers LA1~LAN-1, RA1~RA
Speakers LS1 to LSN-1, RS1 through N-1
Each of the speakers LS1 to LSN-1, which are input to the RSN-1,
Drive RS1 to RSN-1.

The audio signals LN and RN are supplied to an amplifier LA.
N, and are input to the body sonic system 13 via the RAN. The body sonic system 13 is of a chair type, for example, in which a vibration unit driven by a low-frequency input is embedded in the back and the seat, respectively.

Reference numeral 14 denotes a second audio distributor, and the first audio distributor 14
Similarly to the audio distributor 10, the sub audio signals (LR) 5,
(L-r) 6 is converted to a plurality of surround sound signals L-R1 to L-R1.
L-RM (M is a natural number) and l-r1 to l-rM (M is a natural number).

Then, each created surround sound signal L
-R1 to L-RM and l-r1 to l-rM are supplied to the surround speakers SS1 to SSM and sS1 to sSM.
On the other hand, for the video, the video signal 1 is supplied to the television receiver 15 and is displayed on the screen of the television receiver 15.

In the above configuration, it is sufficient that the number of main audio signals is two or more, and it is sufficient that there are two or more speakers corresponding thereto. Also, two or more surround speakers may be used.

Next, the operation of the above hardware configuration will be described with reference to the flowchart of FIG. First, when a video signal is captured in step S1, step S2
, A motion vector is detected from the video of the current frame and the video of the previous frame.

The result of the detection is determined in step S3, and if there is no motion vector, that is, if there is no motion picture, the process proceeds to step S4. Conversely, if a motion vector exists, that is, if the image has a motion, the process proceeds to steps S5 and S6.

In step S4, the sub-audio signals (LR) 5, (1-
r) 6 is made equal to each other. Further, the control circuit 8 determines in step S7 the sub audio signal (LR) 5,
Adjustment is made so that the delay amounts of (l-r) 6 with respect to the main signals L11 and R12 become equal.

The thus obtained difference signal (LR) 5,
In step S8 based on (l-r) 6, the surround speakers SS1 to SSM, s are transmitted via the second audio distributor 14.
S1 to sSM are driven.

In the step S5, the main audio signal L1
1 and R12 through the first audio distributor 10, audio signals L1 to LN-1, LN, R1 to RN-1, and RN, respectively, to use speakers LS1 to LSN-1 and RS1 to RS, respectively.
Activate N-1 and body sonic system 13.

In step S6, the sub audio signals (LR) 5,
(L-r) 6 are separately created. And step S
9, the sub audio signals (LR) 5, (l-r) 6
Of the main audio signals L11 and R12 are adjusted by the control signal of the control circuit 8, and the signals thus individually delayed are distributed via the second audio distributor 14, and the surround speakers SS1 to SSM and sS1 to sSM Drive.

By doing so, the surround speakers SS1 to SSM, sS can be used in the case of a motionless image.
1 to sSM, a sound having a small volume is output with the same delay amount with respect to the main audio signals L11 and R12. Conversely, in the case of a moving image, the surround speakers SS1 to SSM and sS are output.
From 1 to sSM, sounds having different delay amounts with respect to the main sound signals L11 and R12 are output, and a three-dimensional sound field matching the sense of depth of the target object in the video is formed.

As described above, in this embodiment, the left and right movement of the object in the video is automatically detected by detecting the motion vector.
In the case of a moving image, the left and right speakers LS1 to LS
N-1 and the stereo reproduction by the RS1 to RSN-1 and the sense of space expansion by the surround speakers SS1 to SSM and sS1 to sSM are realized.
A powerful three-dimensional sound field can be realized by the synergistic effect of the N-1 and the body sonic system 13.

The surround speakers SS1-S
For example, when two main speakers and six surround speakers are used, a set of surround speakers SS1 to SS3 and a pair of sS1 to sSM are arranged as shown in FIG.
It is desirable to arrange the sets of S1 to sS3 alternately and around the listener. Further, it is desirable to arrange these sets at random.

With such an arrangement, it is possible to more effectively change the sound field in accordance with a change in the delay amount caused by the delay unit 9, and the surround speaker SS
By separately arranging the set of sS1 to sS3 and the set of sS1 to sS3, there is an effect that it is possible to prevent a problem of a feeling of spreading of a sound field caused by a bias of a sound image or the like due to a deviation of a sound image.

[0029]

As described above, according to the method of the present invention, the movement of the left and right objects in the stereoscopic video can be automatically detected by detecting the motion vector, and the sound field corresponding to this can be detected by the main sound signal and the sub sound. It can be realized three-dimensionally with a main speaker and surround speakers driven by signals,
For scenes that are difficult to reproduce with the left and right speakers or have little effect, such as the movement of an object in the front-back direction, the body sonic system can be used to give the listener a three-dimensional effect with the body. .

In addition, the present method is not limited to a three-dimensional image, and can be expected to have an effect of enabling a listener to enjoy a three-dimensional feeling only with sound, even for a two-dimensional image. Becomes

[Brief description of the drawings]

FIG. 1 is a block diagram of a hardware configuration for realizing a method of the present invention.

FIG. 2 is a flowchart illustrating the operation of FIG.

FIG. 3 is a diagram showing an arrangement configuration of a specific example of a sound field forming method using two main speakers and six surround speakers.

[Explanation of symbols]

 2 motion vector detection circuit 5, 6 sub audio signal 10 first audio distributor 11, 12 main audio signal 13 body sonic system 14 second audio distributor 15 television receiver

Claims (2)

(57) [Claims] (1) Two or more main audio signals on the left and right and these main audio signals
Two or more sub-audio signals created from the difference signal between audio signals
Output to the speaker according to the motion of the video.
Detect motion vectors in video
Step and whether a motion vector is not detected in the step
Creating all the same sub-audio signals,
All the sub audio signals created in this step are
Delay by a predetermined amount of time on the time axis from the audio signal
And outputting the motion vector to the speaker.
If a motion vector is detected in the detecting step,
Sub audio signals corresponding to the motion vectors detected by
Creating step, and the sub audio signal created in the step
The amount of delay on the time axis from the main audio signal of
The motion vector detected in the step of detecting a motion vector
To calculate and delay according to the
Stereo sound field forming method, characterized by chromatic and step, the. 2. The method according to claim 1, wherein the step of detecting the motion vector comprises :
If a motion vector is detected,
Driving the system.
The method of forming a three-dimensional sound field according to claim 1.