JP2000333297A - Stereophonic sound generator, method for generating stereophonic sound, and medium storing stereophonic sound - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a reproduction sound with excellent presence that applies an optional localization to a specific sound source by combining a binaural source where sound localization is ensured from a recording state with a virtual source applying sound localization to processed conventional sound. SOLUTION: This stereophonic sound generator is provided with a 1st acoustic signal generating means 10 that generates a virtual source applying sound image localization processing to a recorded sound or a synthesis sound or the like, a 2nd acoustic signal generating means 20 that generates a binaural source that is recorded by a dummy head microphone and whose sound image is localized from the recording state, an adder 30 that sums 1st and 2nd acoustic signals, and left right loudspeakers 40L, 40R that reproduce a sound signal outputted from the adder 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of adding a sound signal from a first sound source recorded by a dummy head microphone to a normal sound recorded by a normal microphone or a normal sound generated by voice synthesis. The present invention relates to a three-dimensional sound generation device, a three-dimensional sound generation method, and a medium on which a three-dimensional sound is recorded by adding a sound signal from a second sound source to obtain a three-dimensional reproduction sound with excellent realism. .

[0002]

2. Description of the Related Art Recently, in the field of handling sounds such as a stage, a broadcast site, a movie, a TV game machine, etc., various processings are performed on actually recorded sounds and synthesized sounds by a computer. . One of them is to apply time delay and amplitude adjustment to the audio signals of the left and right two-channel signal system, respectively, to generate a time difference and amplitude difference between each signal system. 2. Description of the Related Art A sound image localization apparatus has been known in which a reproduced sound having a different sense of direction and a different sense of distance is obtained from an actual speaker. The sound image obtained by such a sound image localization apparatus is not a real sound image but is virtually generated using a computer or the like, and the sound image is localized at an arbitrary position different from an actual sound source or a speaker. It is generally called a virtual source because it makes you feel like you are doing it.

Various types of sound image localization devices are known, and there are devices that allow a sound source to be sensed at a specific position (specific direction) by a signal level difference and a phase difference (time difference) between both ears. For example, JP-A-2-298200
And JP-A-6-253399 are known. The method of sound image localization using this digital circuit is to convert a signal from a sound source into an FFT (Fast Fourier Transform), process it on the frequency axis, and convert both left and right channel signals into a frequency-dependent level difference and a phase difference. In this case, the localization of the sound image is digitally controlled.

On the other hand, a binaural system has been conventionally known as a method for strictly generating sound pressure in an original sound field using headphones. In this system, a special microphone called a dummy head (similar to a human head but with microphones installed at the left and right ears) is installed in the original sound field, and both people are listening while people are actually listening. In this method, the sound reaching the ear is recorded as it is on two channels. The recorded acoustic signal is generated at the listener's ear using headphones after recording and transmission.

[0005] In this recording method, the sound around the microphone can be recorded, and the sound can be reproduced as it is when the sound is localized. Therefore, there is a very good sense of localization and presence of the original sound field. Reproduction is a feature, but conventionally, reproduction was substantially limited to headphones. However, in this case, there is a problem that the characteristics of the headphones are mixed and that the headphone is uncomfortable.

For this reason, recently, a transaural system for reproducing using a speaker has been proposed. In this system, the playback device is more complicated than in the former using headphones, but it is possible to solve the problem that the frequency characteristics are disturbed and the user feels uncomfortable. on the other hand,
The transaural method is a method in which a signal equivalent to an acoustic signal reaching the listener's both ears in the original sound field is generated in the listener's both ears by a speaker in the reproduction sound field. In other words, it is ideal that the signal of the right ear (right channel input) in the original sound field reaches the right ear only in the reproduction sound field, and the signal of the left channel only reaches the left ear in the reproduction sound field. However, the use of the speaker causes a phenomenon (crosstalk) that a signal on one side reaches the opposite ear. Also,
The overall frequency characteristics are also disturbed by the frequency characteristics of the speaker and the transfer characteristics between the speaker and the ear. As a result, the intended purpose cannot be fulfilled. Therefore, the trans-oral system suppresses crosstalk,
The frequency characteristics also need to be flat. This is called DSP (Digit
al Signal Processor).

[0007]

However, the sound image localization apparatus using a virtual source as described above can localize a sound image at an arbitrary position around a listener, but is recorded using individual microphones. Since the sound image is localized for each sound source or synthesized sound, if the number of sound sources is extremely large in order to obtain a sense of reality, it is necessary to perform different sound image localization for each of the large number of sound sources. The work for that was very difficult. For example, we recorded and synthesized all the sounds that occur in urban busy places such as airports and train stations, inside concert halls and hotels, in nature filled with many sounds such as birds and babbling streams. After that, it was practically impossible to localize the sound image independently for each sound because of the large number of types of sounds.

[0008] On the other hand, the binaural system records and reproduces an actual sound source as it is,
Even if there are a very large number of sound sources, it is possible to obtain a playback sound with a great sense of realism, but on the other hand, since the sound image has been localized from the time of recording, Processing such as localization of a sound image cannot be performed, and there has been a problem that an arbitrary localization of sound cannot be given to a desired sound source. As a result, it cannot be used for applications where it is not possible to record a real sound source, such as a video game machine or an animated movie, and it is necessary to provide sound localization for the recorded or synthesized sound. There were drawbacks.

The present invention has been proposed to solve the above-mentioned problems of the prior art. It is an object of the present invention to process a binaural source that secures sound localization from the time of recording and a normal sound. Sound generating device and method for generating a reproduced sound with an excellent locality and an arbitrary localization added to a specific sound source by combining with a virtual source to which sound localization has been added And a medium on which a three-dimensional sound is recorded.

Another object of the present invention is to obtain a more practical and effective reproduced sound by reproducing a sound source obtained by combining the binaural source and the virtual source by a stereo dipole method (SD method). It is an object of the present invention to provide a three-dimensional sound generation device, a three-dimensional sound generation method, and a medium in which three-dimensional sound is recorded.

[0011]

In order to achieve the above object, a first aspect of the present invention is to provide a first recorded or synthesized first
Sound image localization calculating means for adding sound localization to the first sound signal, and the first sound signal is output from the left and right speakers with respect to the first sound signal output from the sound image localization calculation means. The first and second crosstalk canceling means for performing processing for canceling the crosstalk of each channel, and the second sound signal are output from the left and right speakers with respect to the second sound signal recorded by the dummy head microphone. A second crosstalk canceling means for performing processing for canceling crosstalk of each channel generated in the case, and adding sound signals from the first and second crosstalk canceling means to add left and right channels. Means for outputting from a speaker.

According to the first aspect of the present invention having such a configuration, the first sound signal to which the localization of the sound obtained by the first sound signal generating means is arbitrarily given is recorded by the dummy head microphone. By adding the obtained second acoustic signals, it is possible to obtain a highly realistic three-dimensional sound combining a binaural source that has secured sound localization from the time of recording and a virtual source to which sound localization has been arbitrarily added. it can.

According to a second aspect of the present invention, there is provided a sound image localization calculating means for adding sound localization to a recorded or synthesized first sound signal, and a first sound signal output from the sound image localization calculating means. And a first crosstalk canceling operation unit for performing processing for canceling crosstalk of each channel generated when the first audio signal is output from the left and right speakers, and constitutes a first audio signal generation unit. Second crosstalk cancellation processing for canceling the crosstalk of each channel generated when the second audio signal is output from the left and right speakers to the second audio signal recorded by the dummy head microphone The second acoustic signal generating means is constituted by the arithmetic means,
A plurality of the first sound signal generating means are provided in parallel in accordance with the number of sound sources for localizing sounds, and the sound signals from the plurality of first sound signal generating means and the sound signals from the second sound signal generating means are added. Means for outputting from left and right channel speakers.

According to the second aspect of the present invention having such a configuration, by providing a plurality of the first acoustic signal generating means, it becomes possible to give different localizations to different sound sources. It is possible to move a plurality of sound sources independently in a sound field for reproducing the acoustic signal generated by the acoustic signal generating means.

According to a third aspect of the present invention, in the three-dimensional sound generating apparatus according to the first or second aspect, the speakers of the left and right channels have a spread angle of 6 to 20 degrees when viewed from the listener's listening point. It is characterized by being arranged between.

According to the third aspect of the present invention having such a configuration, the sound image localization calculation means and the respective crosstalk cancellation calculation means, and the speakers of the adjacent left and right channels, and the stereophonic sound generation method of the present invention utilizing the SD system. The device can be configured.

According to a fourth aspect of the present invention, the first aspect of the present invention is captured from the viewpoint of a method, in which sound localization is added to a recorded or synthesized first sound signal, and the first sound signal is added to the first sound signal. Processing for canceling the crosstalk of each channel which occurs when the first sound signal is output from the left and right speakers, and the second sound signal recorded by the dummy head microphone is , Second
To cancel the crosstalk of each channel generated when the left and right speakers output the left and right speakers, add the first and second sound signals subjected to these processes, and add the left and right speakers. Output from

According to a fifth aspect of the present invention, there is provided a recording medium for realizing the three-dimensional sound generating apparatus and the three-dimensional sound generating method according to any one of the first to fourth aspects. The sound localization is added to the sound signal of the first sound signal, and the first sound signal is subjected to processing for canceling crosstalk of each channel generated when the first sound signal is output from the left and right speakers. The second audio signal recorded by the dummy head microphone is subjected to a process for canceling crosstalk of each channel that occurs when the second audio signal is output from the left and right speakers, and these processes are performed. The recorded first and second acoustic signals are recorded so as to be output from left and right channel speakers.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings.

(1) Configuration of the Embodiment (1-1) Overall Configuration As shown in FIG. 1, the three-dimensional sound generator of this embodiment performs localization processing of a sound image on original sounds such as recorded sounds and synthesized sounds. A first sound signal generating means 10 for generating a virtual source, a second sound signal generating means 20 for generating a binaural source recorded by a dummy head microphone and having a sound image localized from the time of recording, and a first and a second signal. Adder 30 for adding the respective sound signals generated by the two sound signal generating means, and left and right channel speakers 40 for reproducing the sound signals output from the adder 30
L, 40R.

(1-2) First acoustic signal generating means 10 First acoustic signal generating means 1 for generating a virtual source
Reference numeral 0 denotes a sound image localization which is connected to original sound generating means 11 such as a musical sound recorded by a microphone or a musical sound synthesized by a computer, and localizes an acoustic signal output from the original sound generating means 11 in an arbitrary direction around a listener. It has a two-stage configuration of a calculating means 12 and a crosstalk canceling calculating means 14 for performing a crosstalk canceling process.

(1-3) Sound image localization calculation means 12 The sound wave from the sound source is transmitted to a transmission system of a field such as a room or space where the listener is located, and reflected, diffracted, and resonated by the head, auricles, shoulders, etc. of the listener. To the ears (eardrum) of the listener. Here, the transfer functions of these transfer systems are collectively referred to as Head Related Transfer Functions. The sound image localization calculation means 12 includes: a listener and a direction of a sound source to be sound image localized;
The input signal is processed by using a head-related transfer function determined by the directions of L and 40R, and a sound image is localized at an arbitrary position around the listener.

Hereinafter, the principle of the sound image localization calculating means 12 will be described with reference to FIG. FIG. 4 shows a situation where the listener is listening to the sound signal 0 of the sound source 0 with both ears and the headphones PL and PR.
Represents a situation in which the user is listening to the acoustic signals PL and PR of. This situation indicates a situation where it is not necessary to consider the above-mentioned crosstalk. In FIG. 4, HL is the head-related transfer function from the sound source 0 to the left ear of the listener, and HR is the head-related transfer function to the right ear. HH is headphone PL, PR
Transfer function (including a headphone speaker) from the head to the ear, PL and PR are sound signals (sound pressure levels) from the headphones, and EL and ER are sound signals at the entrance of the ear canal of the listener.

The sound signals from the headphones PL and PR are
Sound level 0 at the position of sound source 0 behind the left side of the listener
In order to make it sound as if it is sounding, the sound signal 0 from the sound source 0 and the signals PL, P from the headphones PL, PR are placed at the positions of both ears (entrances of the ear canal) of the listener.
R should be equal. In order for the sound signals from the two speakers 40L, 40RSL, and SR to sound as if they are sounding at a sound pressure level 0 at the position of the sound source 0 on the rear left side of the listener, it is necessary to use both of the listeners. The sound signal V0 from the sound source VS and the sound signals SL and SR from the two speakers 40L and 40R may be equal at the position of the ear (the entrance of the ear canal).

As can be seen from FIG. 4, when a sound is emitted from the sound source VS, the signals near the entrances of the ear canals on the left and right sides are:

## EQU1 ## EL = HL × 0 ER = HR × 0

When sound is emitted from the headphones PL and PR, the acoustic signals EL and E near the ear canal entrances on the left and right sides, respectively.
R is

## EQU2 ## EL = HH × PLER = HH × PR When the sound signals EL and ER are eliminated from Expressions 1 and 2, and the sound signals PL and PR from the headphones PL and PR are obtained,

## EQU3 ## PL = (HL / HH) × V0 PR = (HR / HH) × V0

As described above, the sound image localization calculating means 12 is constituted by the filter for performing (HL / HH) or (HR / HH) processing on the acoustic signal V0 from the sound source. The signals PL and PR are output to the subsequent stage crosstalk canceling calculation means 14.

Further, the sound image localization calculating means 1 as described above
2 is provided with an adjuster 13 for changing the fixed position of the sound image. That is, when a sound from a certain sound source is always heard from a fixed position to the listener, the localization processing of the sound by the sound image localization calculating means 12 may be constant, but the sound source moves within the reproduction sound field. When performing such localization, the localization position is made variable by changing the parameters of the filter in the sound image localization calculation means 12 using the adjuster 13.

(1-4) Crosstalk Canceling Calculation Means 14 The sound signal obtained by the sound image localization calculation means 12 is for localizing a sound image on the assumption that the sound signal is heard through headphones. These headphones send the left and right channel sound signals directly to the listener's ears. However, as in the present invention, when reproducing using the two left and right channel speakers 40L and 40R, the left speaker goes to the right ear. There is also a signal that causes crosstalk from the right speaker to the left ear, and this crosstalk signal gives a sense of incompatibility with the sense of localization of the sound from the real sound source. Therefore, in the present embodiment, there is provided a crosstalk canceling calculating means 14 for calculating and generating a signal for canceling the crosstalk signal and adding the signal to the output signals PL and PR of the sound image localization calculating means 12. As an example, the crosstalk cancellation calculating means 14 outputs the left and right channel output signals PL, PR from the sound image localization calculating means 12.
A first filter 14AL that calculates a transfer function for
14AR and the second filters 14BL and 14BR.

This crosstalk cancel operation means 14
The principle will be described with reference to FIG. FIG. 5 shows the sound source VS (the sound pressure level is set to V0) in which the listener is behind and behind both ears.
And the situation where the user is listening to the sounds of two speakers 40L and 40R (the sound pressure levels are SL and SR, respectively) arranged in front of the listener. In this case, crosstalk occurs in the listener's ear in which sound signals from both the speaker closer to the ear and the speaker farther from the ear can be heard. HE is a head-related transfer function from the speaker 40L or 40R to the ear of the listener closer to the speaker (including the speaker), and HX is a head-related transfer function of the listener to the ear farther from the speaker. (Including speakers).

When sound is emitted from the left speaker 40L and the right speaker 40R disposed in front of the listener so as to be at the same distance to the listener, the transfer functions HE and HX are symmetrical with each other, and the entrances of the left and right ear canals are respectively. Signals EL and ER in the vicinity
Is

## EQU4 ## EL = HE * SL + HX * SR ER = HE * SR + HX * SL Eliminating the signals EL and ER from Equations 1 and 4,
When the signals SL and SR of the speakers 40L and 40R are obtained,

## EQU5 ## SL = (HL * HE * V0-HR * HX * V
0) / (HE ² −HX ² ) SR = (HR * HE * V0−HL * HX * V0) / (H
E ² −HX ² ).

Substituting Equation 3 into Equation 5 to eliminate the acoustic signal V0 and the transfer functions HL and HR related to the sound source VS,

## EQU6 ## SL = (HH / HE) / (1- (HX / HE)
² ) * (PL-PR * (HX / HE)) SR = (HH / HE) / (1- (HX / HE) ² ) *
(PR-PL * (HX / HE)).

The crosstalk canceling calculation means 14 of the present embodiment is constituted by first and second filters for performing the calculation of the equation (6). Note that the crosstalk canceling calculation means is not limited to the filter configuration as shown in the drawing, and any other configuration may be used as long as it cancels the crosstalk generated when the audio signals are reproduced by the left and right channel speakers. Can be used as appropriate.

(1-5) Second Acoustic Signal Generating Unit 20 The second acoustic signal generating unit 20 for generating the binaural source is recorded by the right and left channel dummy head microphones 21 installed in the recording sound field. Connected to the output terminal of the recording device 22 that records the recorded audio. The second acoustic signal generating means 20 includes a recording device 22
And a crosstalk canceling operation unit 23 that performs a crosstalk canceling process on the left and right channel audio signals input from the. The configuration of the crosstalk cancellation calculation means 23 has the same configuration as that of the crosstalk cancellation calculation means employed in the first acoustic signal generation means.

The sound image localization calculation means 12 and the crosstalk cancellation calculation means 14 and 23 are usually
It is configured using a DSP (Digital Signal Processor) or a microcomputer, etc., and performs arithmetic processing of the above-described various transfer functions. The transfer function of each of the filters constituting the sound image localization calculation means 12 is realized using an FIR filter (Finite Impulse Response Filter). This is because the FIR filter can easily realize various transfer functions including a complicated transfer function. Also,
Although there are practical limitations on the transfer functions that can be realized, it is also possible to use an IIR filter (Infinite Impulse Response Filter). This IIR filter has an advantage that the hardware scale and the software scale may be smaller than the FIR filter. Further, as the head-related transfer function for determining the configuration of the filter, a function calculated from an approximation result using a hard sphere arranged at the listener's listening point can be used.

(1-6) Left and right channel speakers 40
L, 40R In the present embodiment, left and right channel speakers 40L, 4R
The OR is positioned so that the distance between its centers is 45 cm or less. The spread angle θ of the speakers 40L and 40R is set to 6 to 20 degrees, preferably about 10 degrees with respect to the listener. That is, in a normal stereo system, the left and right channel speakers 40L,
The spread angle of 40R was set to about 60 degrees,
In the present embodiment, by using the above-described crosstalk cancel calculation means and the speakers 40L and 40R of the adjacent left and right channels having such a small spread angle,
A sound field reproduction system called the SD system is configured.

(2) Operation of the Embodiment The operation of the apparatus of this embodiment having such a configuration is shown in FIG.
It will be described according to.

First, in order to obtain an acoustic signal to be provided to the first acoustic signal generating means 10 for generating a virtual source, sound from a sound source capable of localizing a sound image is recorded by a stereo or monaural microphone. Or use a computer to generate the desired synthesized sound. For example, as shown at A-1 in FIG. Next, sound localization is given to the recorded original sound using the sound image localization calculating means 12. For example, by giving a certain localization to a dialogue or a footstep, and then using the adjuster 13 to change the localization over time, as shown in B-1 of FIG. Try to get the sound of walking. In this example, since it is sufficient to give the same localization to the speech and the footstep of the person, the speech and the footstep are set to 1
After recording with a book microphone or separately recording or synthesizing each, the sound signals of both are added, and then the sound image is localized. As described above, the sound signal from the virtual sound source in which the sound image is localized with respect to the recorded sound and the synthesized sound is canceled by the crosstalk canceling calculation unit 14 when the sound signals are reproduced from the left and right channel speakers 40L and 40R. Processing is performed, and the result is output to the adder 30.

On the other hand, the binaural source recorded by the dummy head microphone is supplied to the second acoustic signal generating means 20 for obtaining the binaural source through the recording device. This binaural source is shown in FIG.
As shown in A-2, using the dummy head microphone 21 arranged in the natural environment, the sound exists around the listener, such as the sound of the surrounding twigs, the sound of birds, and the sound of the river flowing. The sound is recorded on the recording device 22. Next, the recorded sound is input to the crosstalk canceling calculation means 23, and the sound is localized at the time of recording, and the crosstalk is reproduced so that the crosstalk when the sound is reproduced by the left and right channel speakers 40L and 40R is canceled. Perform talk cancellation processing. As a result, as shown in B-2 of FIG. 2, even when the sound is reproduced by the left and right channel speakers 40L and 40R, an acoustic signal for outputting the same three-dimensional reproduced sound as that at the time of recording by the dummy head microphone 21 is obtained. Is obtained.

The thus obtained sound signal from the virtual source output from the first sound signal generating means 10 and the sound signal from the binaural source output from the second sound signal generating means 20 are added to each other. At 30, the added audio signals are output from the left and right channel speakers 40 </ b> L and 40 </ b> R. Then, C in FIG.
As shown in Fig. 5, a listener can hear the sound of a person walking while speaking in a natural environment against the backdrop of river sounds and twigs.

(3) Effects of the Embodiment As described above, according to this embodiment, even if there are a large number of sound sources and it is impossible to localize the sound image to all of them, the dummy head microphone can be used. By combining the recorded binaural source with a virtual source that can arbitrarily localize the sound image,
It is possible to obtain a three-dimensional sound excellent in a sense of reality.

Further, if the SD system is used as in the present embodiment, a three-dimensional sound with a sense of realism can be reproduced only by the two speakers 40L and 40R arranged very close to the left and right. Speaker 40 which was necessary for two
L and 40R can be substantially combined into one space. Further, the SD system is characterized in that the range in which the 3D effect can be experienced (service area) is wide and the localization of the sound image (the position where sound can be heard) is stable, compared to the conventional 3D sound field reproduction system. Furthermore, left and right speakers 4
Since it is not necessary to provide a distance between the stereo speakers 40L and 40L, two stereo speakers 40 which are normally arranged at distant positions.
Even if the L and 40R are arranged at the center without an interval, a 3D sound field having a wide left and right can be reproduced.
Even if L and 40R are concentrated, a sound field much more three-dimensional than a normal boombox can be reproduced. As described above, in the present embodiment using the SD system, a rich stereo sound field having a three-dimensional effect and a spaciousness can be realized with a compact system. It is also possible to create design products.

(4) Other Embodiments The present invention is not limited to the above-described embodiments, but includes the following other embodiments.

(A) When there are a plurality of sound sources for localizing a sound image such as a recorded sound and a synthesized sound, as shown in FIG. 2, a plurality of first sound signal generating means 10-1 to 10-n are arranged in parallel. The output signals of the plurality of first sound signal generation means 10-1 to 10-n are added to the output signals of the second sound signal generation means 20 by an adder 30 to obtain the left and right channels. Output can be made from the speakers 40L and 40R. In this case, since different localizations can be given to each sound source, it is possible to obtain a reproduced sound in which various sounds can be heard from different distances and directions with the binaural source as a background. As a result, a common sound field is formed in a situation where there are multiple speakers in different places in a common sound field such as an electronic conference system, or in a virtual space generated by a game machine or a computer. Multiple sound sources (for example, moving in different directions in the sound field)
Game characters and vehicles).

(B) Without using the SD system, the distance between the left and right channel speakers 40L and 40R can be increased so that the spread angle becomes large as in the conventional stereo system.

(C) In the case of the SD system or a normal stereo system, other speakers are provided in addition to the left and right channel speakers 40L and 40R, and the sound image localization calculation means and the crosstalk cancellation are provided for the other speakers. It is also possible to supply an acoustic signal that has been processed by the arithmetic means. In this case, the left and right channel speakers 40L, 40L
It is necessary to perform processing for canceling crosstalk between the speakers for R and other speakers.

(D) Although the above-described embodiment expresses the present invention as an apparatus, the present invention is not realized only by the apparatus of this embodiment. And all methods for generating a three-dimensional sound by a procedure similar to that described in the above.

(E) The present invention is not limited to the device as in the above embodiment and the method as described in the embodiment, and the first and second acoustic signals can be output from the left and right speakers. A recording medium such as a CD-ROM, a video tape, or a DVD recorded as described above is also an embodiment of the present invention.

[0049]

As described above, according to the present invention, a binaural source recorded by a dummy head microphone is used for a sound field in which it is difficult to localize a sound image after recording, and the binaural source and an operator can freely generate a sound image. Since it is made to add and reproduce a virtual source that can set the localization, it is possible to freely move a desired sound in a background sound having a complex sound signal,
It is possible to easily obtain a reproduced sound that is realistic and has excellent expressive power.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a three-dimensional sound generator according to the present invention.

FIG. 2 is a view for explaining the operation of the embodiment of FIG. 1;

FIG. 3 is a block diagram showing a second embodiment of the three-dimensional sound generator according to the present invention.

FIG. 4 is a diagram showing the principle of a sound image localization calculation unit used in the three-dimensional sound generation device according to the present invention.

FIG. 5 is a diagram showing the principle of a crosstalk cancel calculation means used in the three-dimensional sound generation device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... 1st sound signal generation means 11 ... Original sound generation means 12 ... Sound image localization calculation means 13 ... Adjusters 14, 23 ... Crosstalk cancellation calculation means 20 ... 2nd sound signal generation means 21 ... Dummy head microphone 22 ... Recording Apparatus 30 ... Adder 40L, 40R ... Speaker

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuzo Okamoto 3-1-25 Ominishi, Omori-nishi, Ota-ku, Tokyo 204 (72) Inventor Shigetoshi Uchida 2-40-1 Kitahonmachi, Funabashi-shi, Chiba Prefecture Bright City 621 No. (72) Inventor Haruo Hamada 2-2-16 Sekimae, Musashino-shi, Tokyo F-term (reference) 5D011 AB12 5D062 AA64

Claims (5)

[Claims] 1. A sound image localization calculating means for adding sound localization to a recorded or synthesized first acoustic signal, and a first sound signal output from the sound image localization calculating means, A first crosstalk cancellation calculating means for performing processing for canceling crosstalk of each channel generated when an audio signal is output from the left and right speakers, and a second audio signal recorded by a dummy head microphone. A second crosstalk canceling calculating means for performing processing for canceling crosstalk of each channel generated when the second audio signal is output from the left and right speakers; and a first and a second crosstalk canceling calculating means. Means for adding sound signals from the speakers and outputting the signals from left and right channel speakers. Sound generator. 2. A sound image localization calculating means for adding sound localization to a recorded or synthesized first acoustic signal, and a first sound signal output from the sound image localization calculating means, A first crosstalk canceling operation unit for performing a process for canceling crosstalk of each channel generated when an audio signal is output from the left and right speakers, and a first audio signal generation unit; The second crosstalk canceling operation means for performing processing for canceling crosstalk of each channel generated when the second audio signal is output from the left and right speakers to the recorded second audio signal by the second crosstalk cancellation calculating means And a plurality of the first acoustic signal generating means are provided in parallel in accordance with the number of sound sources for localizing sound. Stereo sound generation apparatus, characterized in that it comprises a means for outputting the first audio signal generating means and the second left and right channel speakers by adding the sound signal from the sound signal generator means number. 3. The speaker according to claim 1, wherein the left and right channel speakers are arranged at a spread angle of 6 to 20 degrees when viewed from the listener's listening point. Three-dimensional sound generator. 4. A method in which sound localization is added to a recorded or synthesized first acoustic signal, and the first acoustic signal is output from the left and right speakers with respect to the first acoustic signal. Performs processing for canceling channel crosstalk, and cancels the crosstalk of each channel generated when the second audio signal is output from the left and right speakers with respect to the second audio signal recorded by the dummy head microphone. A stereophonic sound generating method, wherein the first and second acoustic signals subjected to these processes are added and output from left and right channel speakers. 5. A method in which sound localization is added to a recorded or synthesized first acoustic signal, and the first acoustic signal is output from the left and right speakers with respect to the first acoustic signal. Performs processing for canceling channel crosstalk, and cancels the crosstalk of each channel generated when the second audio signal is output from the left and right speakers with respect to the second audio signal recorded by the dummy head microphone. A medium for recording a three-dimensional sound, wherein the first and second acoustic signals subjected to these processes are recorded so as to be output from speakers on the left and right channels.