JPS61252800A - Acoustic device - Google Patents

Abstract

PURPOSE:To obtain a spreading feeling of a listening room by specifying an angle of a segment connecting a reverberating sound speaker and a listening position with respect to the segment connecting a direct sound speaker and the listening position. CONSTITUTION:Since the segment (a) is intersected at an angle of 60 deg. with respect to a segment (b) at a listening point P, a reverberating sound reaches to ears of a listener M with an angle. To the ears of the listener M, accordingly, it seems by illusion that after the reverberating sound strikes against a virtual side wall Wi, it comes with an angle. By this illusion, angles of reflection alpha, betaof the reverberating sound with the side wall Wi and an angle of incidence betaequal to the angle of the reflection alpha may be applied. It seems that there is the side wall Wi at a position requiring the time corresponding to a delay time until reaching. Therefore, though the side wall Wr is actually situated sideways of l1 from the listener M, the listener M feels by illusion that it is situated sideways of l2 of the listener M and the distance l1 to the side wall Wr can be made l2 artificially. Thereby, a wideness as if listening in a wide listening room or a concert hall can be felt.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for pseudo-listening to side walls in a listening room where walls are located close to the side of the listening position, such as in the cabin of an automobile. The present invention relates to an acoustic device that can be spaced apart from a certain location and that can give a sense of spaciousness in a listening room.

As is well known in the art, reproduced sound is transmitted to the walls, ceiling, and
Reverberant sound, which reaches the listener's ears while repeatedly reflecting off the floor, has the effect of making the listener experience the distance to the sound source and the size of the concert hall.

Regarding this reverberant sound, the reverberant sound component is generally included in the playback target such as a record or tape when it is recorded, so even the direct sound that reaches the ear directly from the sound source contains the reverberant sound component. Since the reverberant sound component is extremely small, it cannot produce the above effect.

Therefore, in a sound field where the sound emitted from the sound source inevitably reaches the listener's ears directly, such as in a car interior where it is difficult to secure a sufficient volume for the listening room, the effect of reverberant sound as described above is cannot be expected.

For this reason, ambience devices have been put into practical use that try to obtain a pseudo reverberation sound by reproducing a signal delayed from the original sound signal (September 1988, published by Nippon Motor Co., Ltd., r NI88AN). Service Broadcast” No. 428
No. 269). FIG. 5 shows the configuration of an ambience device, in which a preamplifier 2 is connected to an audio source 1 consisting of a deck, tuner, etc. The preamplifier 2 is provided with a direct sound signal circuit 3 and a reverberant signal circuit 4, which are branched, and the reverberant signal circuit 4 is provided with a reverberant sound generating device 5. Furthermore, both signal circuits 3.4
A mixer 6 is connected to the mixer 6, and a main amplifier 7 and a speaker 8 are provided on the output side of the mixer 6. In such a configuration, the preamplifier 2 is
The acoustic signal input to the reverberant sound generating device 5 via the
The mixer 6 mixes the signal with the direct sound signal on the side. The signal obtained by the mixing is amplified by the main amplifier 7 and reproduced by the speaker 8, thereby making it possible to obtain reproduced sound to which reverberation has been added.

Disadvantages to be Solved by the Invention However, in this ambience device, the reverberant sound and the direct sound are emitted from the same speaker 8, that is, the same sound source, and reach the ears of the listener. For this reason, when listening in the passenger compartment of a car, the time-delayed reverberation emitted from the same sound source as the direct sound can make the sound source seem far away to some extent, but on the other hand, the listener, the passenger, can hear the sound through the window glass. Since the listener is seated close to the listener, the direct person and the reverberant sound reach the listener's ears immediately after being reflected from the windshield. For this reason, the reflected sound heard immediately after hitting the windshield makes you realize that there is a side wall (windshield) near your ears, and it is not possible to achieve the effect of making the listening room artificially larger than it actually is. Ta.

Means for Solving the Problems The present invention has been made in view of the problems of the conventional art. a reverberation circuit that applies a phase change or time delay to the acoustic signal output from the reverberation circuit, and a reverberation sound speaker that reproduces only the acoustic signal output from the reverberation circuit; The angle of the line segment connecting the reverberant sound speaker and the listening position is set to 60° or more and 90° or less.

Effect In the above configuration, the acoustic signal output from the acoustic source is branched and inputted to the direct sound speaker and the reverberation circuit,
The signal is given a phase change or a time delay in the reverberation circuit and is then input to the reverberation speaker. Therefore, in terms of time element, the sound reproduced by the reverberant speaker is delayed with respect to the sound reproduced from the direct sound speaker, i.e., the direct speaker, in the same way as the actual reverberant sound. At this time, the angle of the line segment connecting the reverberant sound speaker and the listening position with respect to the line segment connecting the direct sound speaker and the listening position is 60° or more and 90°.
Since the settings are as follows, the reverberant sound is given directionality with the angle described above with respect to the person directly. Therefore, this reverberant sound reaches the listener's ears in the same manner as the reflected sound that hits the wall located on the side of the listener, with the above-mentioned angle being the reflection angle.

Then, the listener hears the reflected sound (reverberant sound) from the reflection angle.
The audible reflective surface is located at a position where the reflection angle can be given, and is located at a distance that takes a time corresponding to the delay time to reach. Therefore, even in a small space where it is difficult to set a sufficient distance between the listener and the side wall, the auditory reflective surface is given the illusion of being the actual side wall, making the listener feel that the distance to the side wall is far away. hand,
This gives a sense of spaciousness in the listening room.

EXAMPLE An example of the present invention will be described below with reference to the drawings. That is, in FIG. 1, 10 is an audio source consisting of a tuner, deck, CD player, etc.;
is an amplifier. The amplifier 11 includes a direct sound speaker 1.
2 is connected, and the direct sound speaker 12 is arranged in front of the listener M located on the listening point P. On the other hand, a circuit branched to the output side of the acoustic source 10 is provided with a reverberation circuit 13 that gives a phase change or time delay to the input acoustic signal. , reverberant sound speakers 15 are sequentially connected.

The line segment a connecting the reverberant sound speaker 15 and the listening point P is 60
° is set.

In this embodiment with the above configuration, the acoustic signal output from the acoustic source 10 is amplified by the amplifier 11 and reproduced by the direct sound speaker 12. On the other hand, the acoustic signal input to the reverberation circuit 13 is given a phase change or a delay time, is amplified by the amplifier 14, and is reproduced by the reverberation sound speaker 15. Then, as shown by the solid line in FIG. 2, the direct sound that is the sound reproduced by the direct sound speaker 12 crosses the line, and the reverberant sound that is the sound reproduced by the reverberant sound speaker 15 crosses the line as shown by the dotted line. a toward the listener M, respectively.

At this time, the reverberant sound is a sound that has been given a time delay by the reverberation circuit 13, and the line segment a is 60%
Since they intersect at the listening point P at an angle of °,
The reverberant sound reaches the ear of the listener M at the above-mentioned angle. Therefore, the ears of the listener M are under the illusion that the reverberant sound has hit the virtual side wall W1 and then arrived at the angle, and from this illusion, the reverberant sound is caused by the side wall W1 of the reverberant sound.
reflection angle α.

The side wall W1 is experienced as if it were located at a position where it is possible to provide an incident angle β equal to the reflection angle α, and where it takes time to adjust to the delay time. Therefore, although the side wall Wr is actually located on the right side of the listener M, due to the above-mentioned illusion, it is configured to be oriented to the t2 side of the listener M, and the distance to the side wall Wr is It is possible to perform tzK in a pseudo manner on t1. Therefore, even in a small space such as the cabin of a car, where the windshield is located close to the side of the listener (occupant), the windshield is constructed as if it were much further away than it actually is, creating a spacious listening room. You can feel the spaciousness as if you were listening in a concert hall.

In this embodiment, the angle of the line segment a with respect to the line segment A is set to 60°, but if the angle asymptotically approaches 90° as shown in FIG. 3, the imaginary side wall W1.・
・Moves further away to the side. However, at angles exceeding 90°, the reverberations begin to arrive from behind the listener M.
In reality, such reflected sound from the side wall cannot occur, so the virtual side wall W1 cannot be obtained, and the 60°
Below, it becomes audibly difficult to give the illusion that the reverberant sound is the sound reflected from the side wall. Therefore, in order to reliably obtain the virtual side wall W1, it has become clear through experiments conducted by the inventor that it is essential to set the angle to 60° or more and 90° or less.

FIG. 4 shows another embodiment of the present invention, which is applied to a stereo playback device. In other words, an audio source 10 and an amplifier 11 are connected to each R (left and right) channel.
Direct sound speakers 12L for each left and right channel,
12R is connected, and on the other hand, the reverberation circuit 13 is connected to the reverberation sound speaker 1 of each left and right channel via the amplifier 14.
5L and 15R are connected. The reverberant sound speaker 15
The line segments a, a connecting the direct sound speakers 12 L, 15R and the listening point P are set at 60 degrees with respect to the line segments a, b connecting the direct sound speakers 12 L, 12R and the listening point P, respectively.

In this embodiment with the above configuration, the direct sound speaker 1
On the 2L side, there is a reverberation sound from the knee alarm speaker 15L, and on the direct sound speaker 12R side, there is a residual sound speaker.
Due to the reverberant sound of force 15R, each virtual side wall W1 can be obtained by the same effect as in the previous embodiment, and therefore both sides can be constructed as if they were located much further away than they actually are.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention includes a direct sound speaker that emits direct sound and a reverberant sound speaker that emits reverberant sound.
In addition, with respect to the line segment connecting the direct sound speaker and the listening position, the angle of the line segment connecting the reverberant sound speaker and the listening position is set to 60° or more and 90° or less. Therefore, the reverberant sound reaches the listener at the listening point as if the angle is the reflection angle, similar to the actual reflected sound that actually hits the side wall of the listening room, and the side wall reaches the listener at the reflection angle. It is configured to be located on a virtual plane that forms the same angle of incidence as . Therefore, even in a small space such as a vehicle interior where it is difficult to set a sufficient distance between the actual side wall and the receiving point, the illusion is created as if the side wall exists at the hypothetical position, and the distance to the side wall is simulated. This gives you the feeling of being far away from the target and giving you a sense of the spaciousness of the walking room.

[Brief explanation of the drawing]

FIG. 1 is a block explanatory diagram showing one embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams showing the operation of the same embodiment, and FIG.
FIG. 5 is a block diagram showing another embodiment of the present invention. FIG. 5 is a block diagram showing an ambience device. 10...Acoustic source, 12.12L, 12R...
- Direct sound speaker, 130 - Reverberation circuit, 15... Reverberation speaker P... Listening point, Mo - Listener. 2 people Figure 1 Figure 4

Claims (1)

[Claims] 1. A direct sound speaker that reproduces the acoustic signal output from the acoustic source, a reverberation circuit that applies a phase change or time delay to the acoustic signal branched from the acoustic source, and only the acoustic signal output from the reverberation circuit. a reverberant sound speaker that reproduces the sound, and an angle of a line segment connecting the reverberant sound speaker and the listening position with respect to a line segment connecting the direct sound speaker and the listening position is set to 60° or more and 90° or less. A sound device characterized by: