JPH01264099A - Vehicle mounted acoustic system - Google Patents

Abstract

PURPOSE:To obtain a preferable sound field to even a listener in a rear seat by providing a couple of right/left auxiliary speakers fitted to the rear face of a front seat. CONSTITUTION:A small sized speaker 2 is embedded in the rear side of a front seat 3 as an auxiliary speaker 2. That is, without the auxiliary speaker 2, the direction of sound source is biased to the right side of the front door speaker for a listener in the left rear seat and the sound source is biased to the left side of the door speaker for the listener at the right seat. This is caused because the front seat shuts off sound. Thus, the auxiliary speaker 2 is added to the rear side of the front seat. Thus, a biased sound image is prevented.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a stereo sound system for use in a vehicle.

B1 Overview of the invention When using a door speaker in a car speaker system,
For listeners in the rear seats, a speaker that reproduces only mid-high frequency components is embedded behind the front seat.The sound played from the speakers embedded in the front seat is more constant than the sound played from the front door speakers. It is configured to reach the listener with a time delay.

C0 Prior Art One type of speaker arrangement installed in a vehicle interior is a door speaker. With this speaker arrangement.

The transmission characteristics are quite different between the front and rear seats.
It is difficult to create a uniform sound field. Especially in the rear left and right seats, the front seats block sound waves, and high-frequency components are particularly likely to be attenuated. As a result, the distance to the sound source also feels far away, which does not create a desirable sound field.

However, in the front seats, it is unavoidable that the sound is uneven, but the sound pressure level is high and also contains high-frequency components, so
The sound field is better than that of the rear seats. Although the rear seat is a place where you can listen to music in a calm and mentally relaxed manner6, it is undesirable that the sound field environment of the door speakers is inferior to that of the front seat.

Therefore, if a speaker is installed in the rear parcel, there will be a sound source behind one horse, which will create a rather strange feeling, so this method is also not preferable. It is desirable to place the speakers on the front side. Another option is to install speakers in the rear doors of the rear seats in the same way as the front seats. However, with this method, listeners in the front seats are likely to be dominated by the rear sounds.

I can't say it's desirable. Furthermore, for listeners in the rear seats, the level difference between the left and right signals becomes large, causing the sound to become unbalanced.

D0 Problems to be Solved by the Invention As described above, there is no known stereo sound system for a vehicle that satisfies both the listeners in the front seats and the listeners in the rear seats.

[Object of the Invention] An object of the present invention is to provide a speaker system that can satisfy listeners in the rear seats in a situation where speakers must be installed in the front door due to the installation location.

In order to achieve the object described in 2.20, the in-vehicle sound system according to the present invention includes a pair of left and right front speakers attached to the doors on both sides of the front seat, and a pair of front speakers attached to the doors on both sides of the front seat. The gist includes a pair of left and right auxiliary speakers attached to the back of the seat, and a stereo sound source that supplies signals to the front speakers and the auxiliary speakers.

In an advantageous embodiment of the present invention, the auxiliary speaker reproduces the inner high frequency side of the signal from the stereo sound source,
Also, the reproduction from the front speakers is delayed by a predetermined time.

The middle and high frequency components are satisfactory even to those listening in the rear seats of the vehicle interior, which is configured with an F1-acting door speaker system, and the sound source is not biased in one direction, resulting in a favorable sound field. Furthermore, for a person listening on the left side of the rear seat, for example, among the sound sources output from the front door speakers, the sound output from the left speaker is blocked by the left front seat and is output from the right speaker. Since there is no sound insulating material, listeners on the rear left side tend to feel the sound source toward the right side. For this reason, a speaker is embedded in the back of the seat to reproduce mid- and high-frequency components, but if you play it as is, the sound will be biased towards the left side (auxiliary speaker). Therefore, the sound output from the auxiliary speaker must be output with a certain time delay with respect to the sound output from the front door speaker. This is because the auxiliary speaker is close to the listener, and the front door speaker is far from the listener, resulting in a difference in arrival time.

G8 Embodiment The present invention will be explained in more detail using examples below with reference to one drawing, but these are merely illustrative, and various modifications and improvements may be made without going beyond the scope of the present invention. Of course you can get it.

FIG. 1 is a vehicle interior speaker system according to the present invention, and FIG. 2 is a perspective view of a front seat viewed obliquely from behind.

In the figure, 1 and 1' are door speakers, 2 and 2' are auxiliary speakers, 3.3' are front seats, and 4.4' are rear seats. A small speaker is embedded in it.

The operation of the above embodiment will be explained below.

Without the auxiliary speaker 2, as shown in Figure 3, the direction of the sound source will be to the right of the front door speaker for listeners in the rear seats, and the sound source will be to the left of the door speaker for people with heartache. The reality is that the sound source is biased toward the

This is because the front seats block out sound. Therefore, by adding the auxiliary speaker 2 to the back side of the front seat, it is possible to prevent the sound image from being biased.

Furthermore, since the front seats in the rear seats are made of sound-absorbing material, high-frequency components are reduced. I will also consider making up for this lack of high frequencies.

Therefore, as the auxiliary speaker 2, a small diameter speaker is sufficient. In Figure 3, 5 and 5' are left and right signal inputs, 6.6' is an amplifier, 7.7' is a high-pass filter, and 8
, 8' are regulators, and 9, 9' are delay circuits.

FIG. 4 shows signal components output from the speaker. Conventional door speakers 1 and 1' output as is, and auxiliary speakers 2 and 2' output at a cutoff frequency of 5001.
A signal passed through a high-pass filter 7.7' of about 1z is used to output middle and high frequency components. Furthermore, in order to prevent the sound from becoming uneven, level adjustment is also provided using volume controllers 8, 8'.

In addition to the back of the front seat, it can also be embedded in the headrest.

As described in detail of the H1 invention, according to the present invention, a sound field that is favorable even to listeners in the rear seats can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows an in-vehicle speaker system according to the present invention, FIG. 2 is a perspective view of a front seat viewed obliquely from the rear, and FIG. 3 shows the geometrical arrangement and electrical configuration of the in-vehicle audio system according to the present invention. Conceptual diagram FIG. 4 is a conceptual diagram showing signal components output from a speaker. 1.1'...Door speaker, 2,2'.
...Old...Auxiliary speaker, 3.3'...
・Front seat, 4.4'...Rear seat, 5
．． 5'・・・・・・Left and right signal input, 6.6'・
・・・・・・・・・Amplifier, 7, 7′・・High pass filter, 8, 8′・Old・・・・Adjuster, 9, 9′
・Old...delay circuit. Patent applicant Clarion Co., Ltd.

Claims (2)

[Claims] (1) (a) A pair of left and right front speakers attached to the doors on both sides of the front seat, (b) A pair of left and right auxiliary speakers attached to the back of the front seat, and (c) The above A vehicle-mounted sound system comprising a stereo sound source providing signals to a front speaker and an auxiliary speaker. (2) The auxiliary speaker reproduces the inner high frequency side of the signal from the stereo sound source, and is delayed by a predetermined time with respect to the reproduction by the front speaker. in-vehicle sound system.