JP3374425B2 - Sound equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio device using a sound field recording / reproducing system used in the technical field of audio engineering, for example.

[0002]

2. Description of the Related Art As a conventional acoustic device using a sound field recording / reproducing system, one having a structure shown in FIGS. 4 and 5 is known. Hereinafter, the sound field recording / reproducing method shown in FIG. 4 will be referred to as “conventional method A”, and the sound field recording / reproducing method shown in FIG. 5 will be referred to as “conventional method B”.

First, the conventional method A will be described with reference to FIG. In FIG. 4, 1 is a system for collecting sound, 2 is a sounding body,
Reference numerals 3 and 4 are sound collecting means mainly for collecting a direct sound from the sound producing body 2, and 5 is a sound collecting means for mainly collecting a reverberant sound from the sound collecting system 1. 4, 6 and 7 are pre-filter groups, 8 and 9 are signal amplifying devices, 10 and 11 are signal reproducing means, 12 is a person who hears reproduced sound, and 13 is a system for reproducing.

In this system, the reverberation characteristic of the sound collecting system 1 is provided by appropriately adding the signal collected in 5 to the signal collected in 3 and 4. In playback, 2ch speaker 1 as playback means
Use 0, 11 or headphones. According to the conventional method A, the listener 12 can enjoy the front localization by the natural tone color of the sound image of the sounding body by reproducing the speaker.

Next, the conventional method B will be described with reference to FIG.
The conventional method B is a sound field recording / reproducing method having a configuration different from that of the conventional method A. In FIG. 5, 14 is a dummy head made based on a human shape. Reference numerals 15 and 16 denote sound collecting means arranged on the left and right ears of the dummy head.

[0006] In this system, when reproducing, FIG.
How to listen with headphones 17 like (A),
There is a method of using the speakers 10 and 11 as shown in FIG. In the case of (i), a signal for finally removing the component (crosstalk component) of the audio signal radiated from the speakers 10 and 11 reaching the ear on the opposite side of the listener at the ear opening of the listener 12. It is common practice to place the processing unit 18 in front.

In the conventional method B, acoustic information input to the ear opening at the position where the dummy head 14 is placed is recorded, and the information is reproduced at the ear opening of the listener 12, whereby the placement of the dummy head 14 of the sound pickup system is arranged. The listener 12 is allowed to enjoy a realistic three-dimensional acoustic spatial sensation of being in a position.
By the way, the above-described conventional sound field sound collecting and reproducing system has the following problems.

The conventional method A has the following problems. 1. Since the reverberation sound collecting means 5 mainly uses an omnidirectional microphone, it was not possible to record the direction information of the reverberation of the sound collection system. 2. Therefore, it is difficult to obtain a natural reverberation even when the reproduced sound is heard.

The conventional method B has the following problems. 3. Since it is difficult to match the shape of the head and the ear of the listener 12 in the recording system with the dummy head 14 in the recording system, the tone color tends to be particularly tight during reproduction. The object of the present invention is to provide the above-mentioned 1. ~ 3. An object of the present invention is to provide an audio device capable of solving all of the above problems.

[0010]

The problem to be solved is that it is difficult to obtain a natural reverberation in the conventional method A, and the timbre tends to be hard in the conventional method B. is there.

[0011]

First means according to the invention To achieve the above object, according to a first sound collecting means 3, 4 for picking up direct sound from the sounding body 2 in stereo, the remaining Hibikioto from the sounding body The second sound collecting means 20, 21 for collecting only the sound by the binaural signal.
If, against the picked-up signal by the upper Symbol second collecting means
However , the first matrix processing means 29 for compensating the crosstalk in the reproduction of the speakers 10 and 11 and the above-mentioned first collection processing.
Sound picked up by the sound means and the first matrix
Mixing hand that mixes with the signal obtained by the processing means
An acoustic device comprising a step (no reference numeral) .

The second means according to the present invention is the first sound collecting means 3, 4 for collecting the direct sound from the sounding body 2 in stereo.
When the only remaining Hibikioto from the sounding body and the second sound collecting means 20, 21 for picking up the binaural signal, to the signal picked up by the upper Symbol first sound pickup means, the headphone
Second matrix processing means 28 for adding crosstalk for forward localization when reproducing 17 and the second sound collection
The sound collected by the means and the second matrix processing
Mixing means for mixing with the signal obtained by the processing means
(No reference numeral) .

A third means of the invention, above the first sound collecting means, sound absorbing means 3 0 to block or attenuate the sound from the other direction of the sounding body is provided, said second collecting means
Shuts off or attenuates the direct sound from the above sounding body.
The first or second feature that the sound absorbing means 31 is provided.
The sound device according to the means.

A fourth means according to the present invention is the second collection method described above.
The sound unit, obtained in advance reverberation characteristics of the sound collecting system is assumed,
Is it a stereo signal picked up by the first sound pickup means?
In the acoustic device according to the first or second aspect, a monaural signal is generated, and the reverberation characteristic is convoluted with the monaural signal (convolution processing 38) to generate the binaural signal. is there.

[0015]

According to this, while the sounding body is localized forward with a natural tone color, the reverberant sound in the sound collecting system can be enjoyed by the listener with a three-dimensional spread.
The tonal tightness of the reverberation due to the binaural signal can be reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.

In FIG. 1, reference numerals 30 and 31 denote sound absorbing means. In the sound absorbing means 30, the sound collecting means 3 and 4 are mainly the sounding body 2.
It is installed for the purpose of shutting out or attenuating the sound from directions other than the direction of the sounding body 2 so as to pick up the direct sound from. A method of using sound collecting means having directivity in the direction of the sounding body 2 as the sound collecting means 3 and 4 without providing the sound absorbing means 30 is also effective. The sound absorbing means 31 is the sound collecting means 20, 21 arranged at the ear of the dummy head 19.
On the other hand, it is installed for the purpose of shutting out or attenuating the direct sound from the sounding body 2. Sound collecting means 3, 4,
The sound signals picked up at 20 and 21 are mixed by applying appropriate gains 24, 25, 26 and 27 in the mixing stage. Further, at this time, the delay elements 22 and 23 may be provided.

Further, in this mixing, as a reproduction system, 2
When a ch speaker is assumed, a matrix process 29 is provided for the purpose of crosstalk compensation in speaker reproduction of an acoustic signal recorded by the dummy head 19. When a headphone is assumed as the reproduction system, matrix processing 28 is provided for the purpose of adding crosstalk to the signals picked up by the sound pickup means 3 and 4.

FIG. 2 shows the matrix processing 28 in FIG.
An example for each of the 29 is shown.

FIG. 2A shows an embodiment of the matrix processing 29 for the purpose of crosstalk compensation in the speaker reproduction shown in FIG. S in FIG.
A is the relationship between the speakers 10 and 11 and the listener 12 in the reproduction system as shown in FIG. 2 (u), and the acoustic transfer characteristic S from the speaker to the ear opening on the speaker side and the speaker to the speaker It indicates the acoustic transfer characteristic A to the ear opening located on the opposite side. Processing 32 and 3 in FIG.
3 is the filter coefficient calculated as described there and F
This indicates that IR processing is performed.

FIG. 2A shows an embodiment of the matrix processing 28 for the purpose of adding crosstalk in FIG. It is shown that the processes 34 and 35 in FIG. 2A are the same as the processes 32 and 33 in FIG.

That is, in this device, when the sound is reproduced by the 2ch speaker, the sound by the 2ch stereo microphone which mainly records the direct sound from the sounding body is reproduced as it is by the 2ch speaker. With respect to the sounding body located in the front, a natural tone color as in the conventional method A and a reproduced sound in the front localization can be heard. In addition, the reverberation sound of the sound collection system recorded by the binaural signal can be reproduced in the listener's ear of the reproduced sound by performing crosstalk compensation processing by speaker reproduction in advance. It is possible to enjoy the three-dimensional spatial information of the reverberation sound in the sound collection system.

Therefore, by appropriately adding these two kinds of voices, the listener is localized in a natural tone color forward in the 2ch speaker reproducing system, and the reverberant sound in the sound collecting system is spread three-dimensionally. Can be enjoyed. The reverberant sound has a smaller level than the direct sound, and the level in the high frequency range tends to be further reduced due to the reflected sound, so that the reverberant sound due to the binaural signal has a weak tone color.

In this way, according to the above-mentioned device, the sounding body can be localized forward with a natural tone color, and the reverberant sound in the sound collecting system can be enjoyed by the listener with a three-dimensional spread. The tightness of the reverberant sound due to the signal can be reduced.

Further, when the sound is reproduced by the headphones, the sound from the 2ch stereo microphone, which mainly records the direct sound from the sounding body, is appropriately subjected to the crosstalk process in advance so that the reproduced sound listener can reproduce the sound from the 2ch speaker. You will be able to enjoy the perfect localization and timbre. The reverberation sound of the sound pickup system recorded by the binaural signal can be reproduced as it is with the headphones.
You can enjoy dimensional spatial information. By appropriately adding these two types of sounds, the headphone reproduction system can allow the listener to enjoy the reverberation sound in the sound collection system with a three-dimensional spread while locating the sounding body forward with a natural timbre. it can.

The present invention is not limited to this embodiment, and various modifications such as those shown in FIG. 3 are conceivable. FIG. 3 shows that in the sound collecting system 1, sound impulses are radiated from each assumed sounding body position, the reverberation characteristics of the sound collecting system are obtained in advance by the dummy head 19, and the sounding body is recorded later in the anechoic chamber 37. This reverberation characteristic is convoluted with the monaural signal of (convolution processing 38) to artificially generate the reverberation sound by the binaural signal of the sound pickup system 1 recorded by the dummy head 19 in the embodiment as shown in FIG. It is a thing. Further, when it is assumed that the dummy head 19 is arranged away from the sounding body, it is possible to obtain only the sound impulse response from an appropriate representative position without obtaining the sounding impulse response from each assumed sounding body position. May be used as a typical reverberation characteristic.

[0027]

As described above, according to the present invention, the direct sound from the sounding body is recorded in the 2ch stereo microphone, only the reverberant sound in the sound collecting system is binaurally recorded, and the preprocessing is appropriately performed depending on the type of the reproducing system. The following effects can be obtained by mixing. 1. Compared to the conventional method A, since the reverberation sound collecting means uses the dummy head microphone, the reverberation direction information of the sound collection system can be recorded. 2. Therefore, compared to the conventional method A, a natural reverberation can be obtained even when the reproduced sound is heard. 3. Compared to the conventional method B, the direct sound from the sounding body is picked up by the general sound pickup means as in the conventional method A, so that the tone color tightness as in the dummy head recording can be felt in the reproduction. You can enjoy the front stereo image without.

Further, in the present invention, since the dummy head in the recording system has a lower level than the direct sound and is a reflected sound, the level in the high frequency range is mainly recorded for reverberant sound. When reproducing, the stereoscopic reverberation sound can be enjoyed by the listener without feeling the timbre of the tone that is often present in dummy head recording.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an audio device according to the present invention.

FIG. 2A is a block diagram showing an example of a matrix process for the purpose of crosstalk compensation in speaker reproduction according to the present invention. (B) is a block diagram showing an embodiment of a matrix process for the purpose of adding crosstalk during headphone reproduction in the present invention. It is a figure which shows the meaning of S and A shown in (U) (A) (I).

FIG. 3 is a configuration diagram showing another embodiment of the audio device according to the present invention.

FIG. 4 is a diagram showing a configuration of a sound field recording / reproducing system according to a conventional system A.

5 is a diagram showing a configuration of a sound field recording / reproducing system according to a conventional system B. FIG.

[Explanation of symbols]

1 sound collecting system 2 sound producing body 3, 4 sound collecting means 5 mainly collecting direct sound from the sound producing body 2 sound collecting means 6, 7 mainly collecting reverberant sound from the sound collecting system 1 such as attenuator and delay element Filter groups 8 and 9 Signal amplifying devices 10 and 11 Signal reproducing means (speaker) 12 Reproduced sound Listener 13 Reproduction system 14 Dummy heads 15 and 16 according to the conventional method B Sound pickup arranged at the ear opening of the dummy head 14 Means 17 Signal reproducing means (headphones) 18 Matrix processing section for crosstalk compensation in speaker reproduction 19 Dummy heads 20 and 21 in this method Sound collecting means 22 and 23 delay elements arranged at the ear openings of the dummy head 19 Delay elements 24, 25, 26, 27 Gain 28 Crosstalk addition processing unit 29 Crosstalk compensation processing unit 30, 31 Sound absorbing means 32, 33, 34, 35 FIR filter Motor 36 and audio impulse source 37 anechoic chamber 38 superimposition

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Claims (4)

(57) [Claims] 1. A a first sound collecting means for picking up direct sound in stereo from the sounding body, and a second collecting means for picking up the remaining Hibikioto only a binaural signal from the sounding body, the upper serial to signal collected by the second collecting unit, scan
A first matrix processing means for compensating crosstalk in speaker reproduction, the sound picked up by the first sound collecting means, said first
Mix with the signal obtained by the matrix processing means
An audio device comprising a mixing means . Wherein the first sound collecting means for picking up direct sound in stereo from the sounding body, and a second collecting means for picking up the remaining Hibikioto only a binaural signal from the sounding body, the upper serial to signals picked up by the first sound pickup means, f
A second matrix processing means for adding cross-talk in order to forward localization during Ddofon reproduction, a sound picked up by the second collecting unit, the second
Mix with the signal obtained by the matrix processing means
An audio device comprising a mixing means . 3. The first sound collecting means includes :
Sound absorbing means for blocking or attenuating sound from directions other than the direction is provided , and the second sound collecting means receives a direct sound from the sounding body.
The acoustic device according to claim 1 or 2 , further comprising a sound absorbing means for blocking or dampening . The method according to claim 4 wherein said second collecting means, obtained in advance reverberation characteristics of the sound collection system envisaged by the above-described first sound collecting means
Generate a monaural signal from the stereo signal picked up by
Convolving the reverberation characteristics in this mono signal, the bus
Acoustic device according to claim 1, wherein generating a Inoraru signal.