JPH0427268Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a vehicle audio device in which a speaker is provided at the front or rear of a vehicle or in the headrest of a seat, and the speaker reproduces a reproduction signal from a sound reproduction device. It is related to.

[Summary of the invention] This invention inputs a signal delayed by a predetermined time to a speaker installed in the headrest with respect to a signal from a sound reproduction device that is input to a speaker installed at the front or rear of the vehicle, and then outputs the signal from the speaker installed in the headrest. By reflecting the sound coming from inside the headrest and radiating indirect sound to the outside, the system prevents changes in the sound image depending on the seat position and creates a sufficiently spacious sound field.

[Prior Art] Conventionally, speakers are installed in the rear or front in a vehicle interior, and direct sound is transmitted to the front speakers.
Indirect sound was played back to the rear speakers with a predetermined delay to create a sense of spaciousness and distance.

In other words, the sense of spaciousness of sound means that many clear sound images are distributed over a wide range between the left and right speakers, and the size and width of the sound image matter in this sense of spaciousness of sound. .

That is, in order for the listener to feel the spaciousness of the sound, it is necessary to consider the impression of being surrounded by sound or the impression of a large space such as a concert hall. In order to obtain such a sense of sound spaciousness, it is known that indirect sound obtained by reflection has a large influence on the sense of distance, and it is necessary to take this into consideration.

However, such speakers have the disadvantage that the sound image changes depending on the seat position.

In order to solve this problem, it has been considered to reproduce sound by attaching, for example, a rear speaker to the head rest of the seat in the vehicle interior.

[Problems to be solved by the invention] However, in such a conventional device that reproduces sound by attaching a speaker to the headrest, when considering the spread of sound, the headrest Since the distance from the headrest speaker to the ear is short, the direct sound from the headrest speaker is dominant, giving the impression that you are listening to the sound through a headphone.

As a result, the balance between the reproduced sound between the front or rear speakers and the headrest speaker becomes unbalanced, making it impossible to obtain a sufficiently spacious sound field.

An object of the present invention is to provide a vehicle acoustic device that prevents changes in sound images due to seat positions and creates a sufficiently spacious sound field.

[Means for Solving the Problems] In order to achieve the above object, the vehicle audio device according to the present invention includes a first speaker provided at a predetermined position in the front or rear part of the vehicle; In a vehicle sound reproducing device in which a reproduced signal is inputted from an audio reproducing device to a second speaker provided in a headrest of a seat and reproduced sound is emitted from each of the speakers, the reproduced signal is delayed by a predetermined time to generate a delayed signal. A delay means for outputting to the second speaker and the second speaker are provided inside the headrest at a position where the radiation direction of the speaker is at an acute angle with respect to the headrest longitudinal direction, and the sound reproduced from the second speaker is provided. and a reproduced sound reflecting means for reflecting the reproduced sound inside the headrest and radiating it from approximately the side of the headrest to the vicinity of the listener's ears.

[Function] In this invention, a signal delayed by a predetermined time from the signal from the sound reproduction device is input to the speakers in the headrest, and the indirect sound reflected inside the headrest is radiated to the outside, thereby providing a well-balanced sound to each seat. The sound spreads, and as a result, the sound image is localized.
In addition, the listener gets the impression of being surrounded by indirect sound, and it is possible to create a spacious sound field in the vehicle interior.

[Embodiments of the invention] Hereinafter, embodiments of the invention will be described in detail with reference to the drawings.

A characteristic feature of the present invention is that a signal from a sound reproduction device is supplied to a speaker installed at the front or rear of the vehicle, a delayed signal delayed by a predetermined time is inputted to a speaker in the headrest, and the signal is output from the speaker. The reason is that the reproduced sound is not radiated to the outside as direct sound, but as indirect sound reflected within the headrest.

Fig. 1 is a block diagram of an example of a vehicle acoustic device according to the present invention, Fig. 2 is a block diagram of an example of a speaker system attached to a headrest, and Fig. 3 is a block diagram of an example of a speaker system attached to a headrest. It is a figure showing a state.

In the present invention, as shown in FIG. 3, a rear speaker 1 is provided at the rear of the vehicle interior, and a headrest speaker 2 is provided at the headrest portion of the seat.

As shown in FIG. 1, the two outputs of the sound reproduction device 6, which consists of the reproduction section 3, preamplifiers 4, 4', and main amplifiers 5, 5', are output to the rear speakers 1, 1'.
In addition to being input to the delay circuit 7 such as BBD,
7' to the headrest speakers 2, 2'.

With this configuration, the acoustic signal from the sound reproduction device 6 is reproduced by the rear speakers 1, 1', and the signal with an appropriate delay time is transmitted to the headrest speakers 2, 2' through the delay circuits 7, 7'.
can be played with.

Figures 2a and 2b are a front view and a side sectional view showing the internal structure of the headrest, which is divided into two chambers 12 and 13 by an inner wall 11, and openings 14 and 15 are provided in the outer wall of each chamber. , the speakers 2, 2' are installed inside the respective chambers so that the sound emitted from them is reflected by the inner wall portion and emitted as indirect sound to the outside from the openings 14, 15.

FIG. 4 is a block diagram of another embodiment of the vehicle acoustic device according to the present invention, in which the outputs of the preamplifiers 4 and 4' of the sound reproduction device 6 are subtracted by the arithmetic circuit 8 to extract a difference signal, and The signal is input to the headrest speakers 2, 2' via a delay circuit 9.

In addition, in a headrest speaker like the one shown in Figure 2, the distance between the listener's ears is short, and in order to create a spacious sound field under this condition,
It is important to consider how to increase the effect of indirect sound. Therefore, by considering the reflective material inside the headrest and the arrangement (tilt) of the internal speakers, etc., it is possible to enhance the reverberation effect and obtain a more expansive sound field.

In this embodiment, the rear speakers 1 and 1' are provided at the rear of the vehicle 10, but they may be front speakers provided at the front of the vehicle 10.

[Effects of the Invention] With the configuration as described above, in the present invention, sound spreads to each seat in a well-balanced manner and a sound image is localized. Then, the listener gets the impression of being surrounded by indirect sound, and a spacious sound field can be created in the vehicle interior. Furthermore, by incorporating a speaker inside the headrest and emitting indirect sound, a natural sound that is not harsh on the ears can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the vehicle acoustic device according to the present invention, FIGS. 2 a and b are front sectional views and side views of an example of the vehicle acoustic device according to the present invention, and FIG. FIG. 4 is a block diagram of another embodiment of the vehicle audio system according to the present invention. 1, 1'... Rear speaker, 2, 2'... Headrest speaker, 6... Sound reproduction device, 7, 7'
...Delay circuit, 12, 13... Chamber, 14, 15...
...opening.

Claims (1)

[Claims for Utility Model Registration] A reproduction signal is transmitted from a sound reproduction device to a first speaker provided at a predetermined position in the front or rear part of a vehicle and a second speaker provided in a headrest of a seat in the vehicle. In a vehicle sound reproducing device that receives input and radiates reproduced sound from each speaker, the second speaker includes: a delay unit that delays the reproduced signal by a predetermined time and outputs the delayed signal to the second speaker; The speaker is installed inside the headrest at a position where the radiation direction of the speaker is at an acute angle with respect to the front and back direction of the headrest, and the reproduced sound from the second speaker is reflected inside the headrest and radiated from approximately the side of the headrest to the vicinity of the listener's ears. 1. A vehicle acoustic device comprising: a reproduced sound reflecting means for causing a reproduction sound.