JPS61202600A - Accoustic device - Google Patents

Abstract

PURPOSE:To make possible to produce reverberative sounds having a distance and three-dimensional feeling in a narrow accoustic space such as vehicle chamber by providing a reverberating sound speaker besides the direct sound speaker, and diffusing and adding a sound which is delayed an original sound. CONSTITUTION:The accoustic sounds Lch, Rch outputted from a program source 1 are amplified through a preamplifier 2 by main amplifiers 13, 14, 15 of the respective channels and reproduced by direct sound speakers 20(L), 21(L), 25(R), 26(R), 27(R), 28(R). The accoustic signals mixed in a mixer 10 and affixed with delay time in a delay circuit 11 are amplified by a monomain amplifier 12 and reproduced as the reverberated sound from reverberating sound speakers 16, 17 with a delay of 0.4-50msec. This reproduced sound is reflected by striking against the front window and diffused over a wide range in the horizontal direction or towards the center of the vehicle chamber 9 etc. Since the diffused reverberated sound arrive at the hearer from all directions, the hearer is wrapped in the sound irrespective of the direction of arrival so that excellent expanding feeling is obtained.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention diffuses and adds delayed sound to the original sound, thereby creating a sense of distance and spaciousness, especially in a narrow acoustic space such as a car interior. The present invention relates to an audio device that makes it possible to obtain reverberant sound.

2. Description of the Related Art Conventionally, unlike a listening room where a sufficient acoustic space can be secured, acoustic IT for vehicles such as the one shown in Figs. Sound equipment is in practical use. This vehicle equipment includes program sources such as a cassette deck and a tuner. Preamplifier 2. For front seats.

Each main amplifier 3 and 4 is provided for the rear seats, and the main amplifier 3
, 4 are transmitted to the respective channel reproduction speakers 7R, 7L, 8R provided in the front doors 5, 5 and the rear bar cell nonilflo.

It is reproduced by 8L.

However, in such a vehicle acoustic system, since the internal volume of the vehicle cabin 9, which is the acoustic space, is small, it is not possible to obtain sufficient reverberation sound due to direct sound reflection from the wall like in a general sounding room, and it is mainly used The sound field consists mainly of direct sound. For this reason, today, vehicle sound systems using ambience devices (September 1980, published by Nissho Jidosha ■ "N
IBSAN Service Bulletin” No. 428, page 269)
There are also devices in practical use that actively add reverberant sound to direct sound and reproduce it without relying on reverberant sound caused by wall reflections.

Problems to be Solved by the Invention However, in the above dual-use acoustic system, although it is true that a certain degree of spaciousness can be obtained due to the reverberant sound component contained in the reproduced sound, the direct sound and the reverberant sound are different. Since the reverberant sound is reproduced from the same speaker, the reverberant sound that should be perceived as reflected sound from the surroundings is heard in the same direction as the direct sound.

For this reason, it is not possible to fully obtain a sense of distance that makes the distance to the sound source seem far away, or a sense of spaciousness that makes the surroundings feel as if surrounded by sound, as in a concert hall, but on the contrary, A new problem arises in that the influence of indirect sound radiated from the same direction impairs the sense of localization of the sound image that should be obtained with direct sound.

Means for Solving the Problems The present invention has been made with a focus on such intermediary points, and it reproduces the acoustic signal output from an appropriate program lease so that the tonic axis is oriented in a predetermined direction. a reverberant speaker that reproduces a signal obtained by adding a delay time to the acoustic signal; and a reverberant sound diffuser that is provided on the main sound axis of the reverberant sound speaker and that diffuses the emitted reproduced sound. Means are provided.

Effect: In the above configuration, the acoustic signal output from one suitable program source is reproduced by the direct sound speaker, and at the same time, a signal obtained by adding a delay time to the acoustic signal is reproduced by the reverberant sound speaker. Therefore, the direct sound and the reverberant sound are played by separate speakers, and the sound from the direct sound speaker pointing toward the listener is clear, without being affected by indirect sound, as would be the case if both sounds were played by the same speaker. Accurate sound localization can be obtained.

On the other hand, the sound emitted from the onomatopoeic speaker, that is, the reverberant sound, reaches the listener's ears after being diffused by a diffusion means provided on its main sound axis. For this reason, the listener has the illusion that the diffused reverberant sound is coming from the direct sound speakers as if it were being reflected by a wall that forms a large space, and each speaker is located at a lower position than the actual location. You can get a sense of distance that makes you feel as if you are far away. Furthermore, since the diffused reverberant sound reaches the listener from all directions, the listener is enveloped in the sound without specifying its arrival direction, providing an excellent sense of spaciousness.

EXAMPLE An example of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention, in which a program source 1 is composed of a 1000 yen, a deck, etc., and a preamplifier 2 is provided for each left and right channel Lch and Rch of this program source 1. It is connected. The preamplifier 2 includes a mixer lO9 that mixes L and Rch acoustic signals, a delay circuit 11 that gives a delay time of, for example, 0.4 to 50 mn to the signal mixed by the mixer lO, and a mono main that amplifies the delayed signal. Amplifier 1
2! 1! has been done. Furthermore, the left-hand Jannel main amplifier 13 is on the Lch of preamplifier 2, and the Rch is
A first right channel main amplifier 14 and a second right channel main amplifier 15 are connected. The mono main amplifier 12 includes a first. second reverberation sound speaker 16,
17 are connected, and the noise speakers 16 and 17
are arranged in parallel at intervals on the upper surface of an instrument panel 18 installed horizontally on the front side of the vehicle compartment 9. The reverberant sound speakers 16 and 17 are mounted so that their main sound axes are directed substantially vertically upward, and a front window 19 serving as a reverberation sound diffusion means is located on the main sound axis. The left channel main amplifier 13 is connected to the front seat center speaker 20 (Ll), which is a direct sound speaker, and the rear seat center speaker 21 (L). The rear seat center speaker 21 (Ll) is attached to the rear end of the center console 24 provided between the driver's seat 22 and the passenger seat n, and is oriented toward the rear blade. A driver seat right speaker 25 (R1) and a passenger seat left speaker 26 (R), which are direct sound speakers, are connected to the first right channel main amplifier 14.

Both speakers 25 (R) and 26 (R) are attached to both sides of the instrument panel 18,
The tonic axis is the driver's seat 22. It is directed toward a passenger seated in the passenger seat 23. Furthermore, the second channel main amplifier 15 has a rear seat right speaker 27 which is a direct sound speaker.
(R), rear seat left speaker 28 (connected to R1. Both speakers 27 (G)), 28 (R1 are attached to the inner front end of the rear doors 29, 29,
The main sound axis is directed toward the occupants seated on both sides of the rear seat 30.

In addition, the passenger seated in the front seat 22 and the driver's seat right speaker 25 (
R1, the distance between the front seat center speaker 20 (l) is set to be equal to each other, and similarly, the distance between the pair of valley speakers located on both sides of the front seat with respect to other passengers is also set to be equal to each other. In addition, in Fig. 2, the symbols of each speaker are appended (Ll, (R1 is the left side for playback (L
), right (displaying R1 channel).

Next, the operation of this embodiment according to the above configuration will be considered with respect to the passenger M seated in the driver's seat 22. In other words, I, ch, Rch f @ double signal output from program source 1,
Each channel main amplifier 13 via preamplifier 2
, 14 and 15, mixed by a mixer 10, given a delay time by a delay circuit 11, and then amplified by a mono main amplifier 12. Then, from the driver's seat right speaker 25 (R1) located on the right side of the passenger M, the Rch sound signal amplified by the first right channel main amplifier 14 is reproduced as an RQh direct sound, and the front seat center speaker located on the left From the speaker 20fLl, the Lch acoustic signal amplified by the left channel main amplifier 13 is reproduced as Lch direct sound.At the same time, from the first reverberant sound speaker 16 in the front center, the sound signal is mixed and given a delay time. The signal is reproduced. At this time, the driver's seat right speaker 25 (R1) and the front seat center speaker 20 (Ll)
Since they are at the same distance from the occupant M, the sound image is localized in front of the occupant M. At this time, the driver's seat right speaker 2
5 (the main sound axis of R1 is directed toward the passenger M, and the main sound axis of the front seat center speaker 20 (Ll) is directed toward the center rear of the vehicle interior 9. Therefore, each speaker 2
5(R), 20 (The reproduced sound from Ll is transmitted to the ears of occupant M as a pure direct sound component, without reflecting on the peripheral wall of the narrow passenger compartment 9 and producing reflected sound components with short time intervals. Furthermore, since the reverberant sound is individually reproduced by another first reverberant sound speaker 16, it is not affected by the reverberant sound.Therefore, the sound image is
An ideal sound image localization property that is clearly formed by direct sound, is directly in front of the occupant M, and is clear can be obtained.

On the other hand, from the first reverberant sound speaker 16, the signal amplified by the mono main amplifier 12 is 0.4 to 50 m5a3.
It is delayed and played as reverberation. This delayed L
The mixed sound of ch and Rch hits the front window 19 and is reflected. As shown in FIG. 1, the front window 19 has an oblique shape with its upper side inclined toward the inside of the single compartment 9, and curves toward the inside of the vehicle compartment 9 at both side parts (not shown).

Therefore, the person who was hit by the front windshield 19 is horizontally
It is diffused over a wide area, such as toward the center of the vehicle compartment 9. Therefore, the sound diffused in this way is heard in the ears of the occupant M as if the driver's seat, front seat central tooth speaker 25 (R1, 20
(There is an illusion that the sound emitted from Ll is heard as it roars and reflects off the walls forming a wide space, and each speaker 25 (R1, 20 (Ll) is heard farther away than the actual position. You can get an excellent sense of distance that makes you feel as if you are there.

Furthermore, since the sound diffused over a wide area by the front window 19 having the above-mentioned shape reaches the ears of the occupant M from all directions, the direction of arrival of the sound, that is, the position of the first reverberant sound speaker 16 can be audibly identified. The result is a spacious sound field that is enveloped in sound.

Even for the passenger seated in the passenger seat n, the same effect can be obtained, although the R @ channel sound is in the opposite position compared to the passenger M, and especially for the passenger seated in the rear seat 30. , 1st. Since the distance from the second reverberant speakers 16 and 17 is long, an excellent sense of distance and spaciousness can be obtained.

FIG. 4 shows a second embodiment of the present invention, in which a rear window is used as a reverberation sound diffusion means. That is, a speaker case 31 is mounted horizontally on the rear side of the vehicle compartment 9 or on a separator shelf 6, and a sound absorbing material is installed on the separator shelf 6 between the speaker case 31 and the rear seed pack 30a. Material 32 has been laid. The speaker case 31 is equipped with a direct sound speaker 33 and a reverberant sound speaker 34, and the acoustic signal of the program source 1 is transmitted through the direct sound speaker 33 Kld and the main amplifier 3, and the reverberant sound speaker;
A signal to which a delay time is added by the delay circuit 11 via the main amplifier 4 is input to 34 . The main sound axes of the direct sound speakers 33 are oriented toward the occupant seated in the rear seat 30, and the main sound axes of the reverberation sound speakers 34 are as follows:
It is directed toward the rear window 35, which is a diffusion means. In the above configuration, similar to the above embodiment, the direct sound speaker 32
Clear sound image localization can be obtained by the sound reproduced by the reverberant speakers 3.1, and the sound reproduced by the 3.1 reverberation sound speaker and diffused by hitting the rear window 35 can give a sense of distance and spaciousness. In addition, in this embodiment, since the sound absorbing material 32 is laid on the AL clear parcel 6 of the direct sound speaker 33, the generation of reflected sound with short time intervals accompanying the direct sound can be more effectively suppressed. It is something that can be avoided.

5 and 6 show the third and fourth embodiments of the present invention, respectively, as reverberation sound diffusion means.

It uses an acoustic lens. In the embodiment shown in FIG. 5, an acoustic lens 37 having a curved recess 37a is disposed in front of the reverberant sound speaker 36, that is, on the main sound axis.
8 is fixed to the reverberant sound speaker 36. In addition, in the embodiment shown in FIG.
The acoustic lens 39, which is constructed by superimposing lenses a diagonally at appropriate intervals, is connected to the reverberant sound speaker 36 via the stay 40.
is attached to. According to each of these embodiments, the desired diffusion effect can be obtained by the acoustic lenses 37 and 39, and since the acoustic lenses 37 and 9 are attached to the reverberant sound speaker 36, the mounting position is set to the front window 19. The mounting position can be freely selected without being limited to the vicinity.

FIG. 7 shows a fifth embodiment of the present invention, in which one reflecting plate 41 is used as the reverberation sound diffusion means.

The reflecting plate 41 has a spherical surface 4 bulging toward the reverberant sound speaker 36 side.
1a, and is supported by L-shaped stays 42, 42 in front of the reverberant sound speaker 36, on the main sound axis.

According to this embodiment, the mounting position can be freely selected as in the third and fourth embodiments, and the sound quality can be adjusted by changing the material of the reflector 41, the curvature of the spherical surface 41a, etc. This also makes it possible.

Furthermore, according to each of the embodiments 3.4.5, it is possible to obtain the same sense of ff1d, spaciousness, etc. not only in a single room on the 9th floor but also in a general listening room, especially in a listening room with a small volume. be.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention reproduces a sound output from an appropriate program source through a direct sound speaker, and regenerates a signal given a delay time through a reverberant speaker. A reverberation sound diffusion means is provided on the main sound axis of the reverberation sound speaker. Therefore, the sound having a delay time emitted from the reverberant sound speaker is diffused by the diffusion means, reaches the listener's ears from one surrounding without specifying the direction of arrival, and is enveloped by the sound, resulting in an excellent spread. You can feel it. In addition, due to the shallow sound that reaches the ears from the surroundings through diffusion, the listener is given the illusion that the sound is directly reflecting off a wall that forms a large space and is being heard. An excellent sense of distance can be obtained, giving the impression that the speakers placed inside are much farther away than their actual location. Furthermore, the sound that produces such a reverberation effect and the direct sound obtained by reproducing the acoustic signal of the program source as it is are reproduced by individual speakers, and the speakers that emit direct sound have their main sound axis. Since it is directed toward the listener, it is possible to localize a clear sound image to the listener without being affected by the sound from the reverberant speaker.

In addition, the above 3. In the fourth embodiment, since the reverberant sound diffusion means is integrally provided with the reverberant sound speaker, there is flexibility in the mounting position, and in the fifth embodiment, the material and curvature of the reflector can be adjusted. By changing the sound quality, it is also possible to adjust the sound quality.

[Brief explanation of the drawing]

FIG. 1 is an explanatory side view showing a speaker arrangement structure according to an embodiment of the present invention, FIG. 2 is an explanatory plan view showing a speaker arrangement structure according to the embodiment, and FIG. 3 is a block circuit diagram of the embodiment. ,
FIG. 4 is an explanatory diagram showing the second embodiment of the present invention, Section 5.6
．． 7 is a side view showing the main parts of the 3.4.5 embodiment of the present invention, and FIG. 8 is an explanatory diagram showing a conventional vehicle acoustic device.
FIG. 9 is an explanatory side view showing the speaker arrangement structure of the device. 1...Program source, 11...Delay circuit, 16
A first reverberation sound speaker, 17... second reverberation sound speaker,
19...Front window (reverberation sound diffusion means), 20
(Ll...Front seat center speaker (if contact speaker),
21 fLl...Rear seat center speaker (direct sound speaker), 25 (R)...Driver seat right speaker (direct sound speaker), 26 (R1...Passenger seat left speaker (direct sound speaker), 27 (R1) ...Rear seat right speaker (
Direct sound speaker), 28 (■... Rear seat left speaker (
direct sound speaker), O...direct sound speaker, '(4
, 36... Reverberant sound speaker, 35... Rear window (reverberant sound diffusion means), 37, 39... Acoustic lens (
Overtime 1 Figure 2 Figure 4] 1 4 Figure 5 Figure 6 3 colors Figure 7

Claims (1)

[Claims] (1) A direct sound speaker that reproduces an acoustic signal output from an appropriate program source and whose tonic axis is directed toward the listener, and a reverberant sound that reproduces a signal obtained by adding a delay time to the acoustic signal. 1. An acoustic device comprising: a speaker; and a reverberation sound diffusion means provided on the main sound axis of the reverberation sound speaker and diffusing radiated reproduced sound.