JP2568059Y2 - In-vehicle sound reproduction device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle sound reproducing apparatus to be mounted on an automobile or the like and used in particular. The present invention relates to a sound reproducing device for use.

[0002]

Conventionally, a typical vehicle audio reproducing apparatus, has been coordinated <br/> place the speakers in each of the front left and right and rear left of the vehicle body interior. In this case, the front speaker is disposed on the lower or dashboard of the vehicle body front of the door, rear spin <br/> over months is normal to have placed on the rear tray.

However, when such a speaker arrangement is performed, the front speaker arrangement is relatively narrow, whereas the rear speaker arrangement is relatively wide. A front speaker having a small diameter is used, while a rear speaker having a large diameter is used.

[0004]

In [devised is to solve the above vehicle audio reproducing apparatus such as described above, by the diameter of the front speakers and the rear spin <br/> over mosquitoes are different, during reproduction of the bass signal,
In particular, when trying to obtain a sufficiently low tone in terms of audibility, the sound image localization in the low tone shifts considerably backward from the normal position, resulting in an overall unnatural sound.
There was.

The present invention has been devised in order to solve such a problem, and its purpose is to use a small-diameter front speaker and a large-diameter rear speaker. even when an front localization of sound image can be ensured, to provide a vehicle audio reproducing apparatus capable of obtaining audibility sufficient bass.

[0006]

In order to achieve the above-mentioned object, an on-vehicle sound reproducing apparatus according to the present invention comprises a forward signal and a forward signal.
Acoustic signals consisting of rear signals are sent to each side of the car
Two front speakers and two rear speakers
And reproduces the forward signal with a low-frequency cut-off.
Low frequency f _FL to add to the front speakers
That means a low-frequency cut from the rear signal off frequency f _RL Delo
-Cut low cut signal and high cutoff frequency
Form a high cut signal that is high cut at f _RH ,
After that, the high cut signal is enhanced and added to the low cut signal
And means for adding this addition signal to the rear speakers.
Only, the cut-off frequency f _FL, f _RL, between the _RH f, f _RL
> Is provided with a means that to have a relationship of f _RH ≧ f _FL.

[0007] In addition, in order to achieve the above object, the present invention
Vehicle audio reproducing apparatus according from front signal and rear signal
Sound signals are arranged on each side of the front and rear of the car.
Play with two front speakers and two rear speakers
Rear speakers as front speakers.
At least 10Hz higher than the lowest resonance frequency
Select the one with the lowest resonance frequency to reproduce the bass signal
Low-frequency cutoff from the rear signal
Low-cut signal and high- frequency signal low-cut at frequency f _RL
The high cut signal that is high cut at the cutoff frequency f _RH
Form, then enhance the high-cut signal and low-cut
Signal and add this signal to the rear speakers.
And between each cutoff frequency f _RL , f _RH , f _RL >
There is provided a means for _providing a relationship of f _RH .

[0008]

Generally, in a low-frequency sound having a low directivity, such as a heavy bass signal, the direction of the sound source is determined as follows.
It is known that the sound has a great relation to the rising portion of the bass.

Therefore, in the present invention, the forward signal is low.
After low cut at the frequency cutoff frequency f _FL ,
In addition to the speaker, the rear signal is converted to a low-frequency cutoff frequency f _RL
The low-cut signal and the rear signal
High after cutting high at cut-off frequency f _RH
First hand that adds the cut signal and adds it to the rear speaker
Adopting a step, or in the first means,
And low-cut front signals with low cut-off frequency f _FL
After, instead of Ru addition to the front speakers, front spin
Less than the lowest resonance frequency of the rear speaker
Both have the lowest resonance frequency higher than 10Hz,
Using the signal whose signal component is not reproduced, the front signal is
By adopting a second means for adding to the front speakers.
Therefore, a rich bass signal signal rich in volume is reproduced from the rear speaker.

When the signal is reproduced in this manner, the flow
Only the bass rising portion (bass) (contour of the bass) is reproduced from the cement speaker, also become bass rich unclear massive sound image localization is reproduced from the rear speakers, the car The listener of the sound reproducing apparatus present feels that these bass sounds (heavy bass sounds) are generated in a portion near the front.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the sound reproducing apparatus according to the present invention.

In FIG. 1 , 1 is a low-cut filter for a front signal, 2 is a high-cut and low-cut filter for a rear signal, 3 is a power amplifier for a front signal, 4 is a power amplifier for a rear signal, 5 is a front speaker arranged in front , 6 Is a rear speaker arranged rearward, 7 is a voltage amplifier, 8 is a signal adder, 9 is a front signal input terminal, and 10 is a rear signal input terminal.

The low-cut filter 1 has a low-frequency cut-off frequency f _FL , and the frequency f
_{In addition} to cutting low-frequency (heavy low-frequency) signal components equal to or lower than _FL, it works so as to pass a low-cut signal (hereinafter referred to as a front low-cut signal) equal to or higher than the frequency f _FL . Also, high cut and Russia - cut filter 2 is substantially high-cut filter and b - and consists of two filter cut filter, in which the high-cut filter is high frequency cut-off frequency f _RH, Russia - cut filter Has a low-frequency cut-off frequency f _RL , transmits a signal component of the frequency f _RH or lower in the rear signal from the output terminal 21 as a high cut signal, and outputs a signal component of the frequency f _RL or higher in the rear signal. The signal component serves to transmit a low cut signal (hereinafter referred to as a rear low cut signal) from the output terminal 22.

Note that each of the cutoff frequencies f _FL ,
Between f _RH and f _RL , f _RL > f _RH , f _RH ≧ f _FL , f _RH ≦
It has a relationship of 200 Hz.

The sound reproducing apparatus according to the present embodiment performs the following operation.

The front signal supplied from the front signal input terminal 9 to the low-cut filter 1 is changed by the cut-off frequency f _{FL of the} filter 1 into the front speaker 5 therein.
The low-frequency (heavy low-frequency) signal component equal to or lower than the lowest resonance frequency f ₀ is cut off, and the remaining signal component equal to or higher than the cut-off frequency f _FL is extracted as a front low-cut signal. Then
The front low-cut signal is power-amplified by the front signal power amplifier 3 and is output from the front speaker 5.

The rear signal supplied from the rear signal input terminal 10 to the high cut and low cut filter 2 is:
By the high cut-off frequency f _{RH of the} filter 2,
The signal component above the frequency f _RH in the rear signal is cut off,
Both the remaining frequency f _RH following signal components are taken out from the output terminal 21 as a high-cut signal, the low band cut-off frequency f _RL of the filter 2, the low band cut-off frequency f _RL following signal components in the rear signal Is cut off, and the remaining signal components below the frequency f _RL are extracted from the output terminal 22 as a rear low cut signal. Next, the high cut signal is amplified and amplified by the voltage amplifier 7, and then supplied to the signal adder 8, and the rear low cut signal is directly supplied to the signal adder 8, where both are mixed. This mixing signal is a power amplifier 4 for the rear signal.
, And is output from the rear speaker 6.

In this case, in this embodiment, for the front signal, the low-frequency (heavy low-frequency) signal component in the front low-cut filter 1 is cut by the arrangement of the front low-cut filter 1, so that the rising portion (contour portion) of the low-frequency signal is cut. Only the front speaker 5
For the rear signal, the rear high cut and low cut filter 2 and the voltage amplifier 7 are arranged so that the bass signal in the rear signal is reduced by about 6 to 10 with respect to the other signals.
By increasing the sound level by about db, a rich and massive bass signal whose sound image localization is unclear is reproduced by the rear speaker 6, so that the localization of the bass image of the bass signal in the reproduced sound signal can be performed by a conventional device of this type. In comparison with this, it is possible to reproduce a bass sound which moves considerably forward and has a sufficiently abundant sound volume.

FIG. 2 is a block diagram showing another embodiment of the sound reproducing apparatus of the present invention.

In the above-described embodiment, the front signal path is used in the front signal path.
In this embodiment, the cut filter 1 is arranged. In this embodiment, the lowest resonance frequency f ₀ of the front speaker 5 is replaced by the rear speaker, except for the front low cut filter 1. - it is those who chose to be higher at least 10Hz or higher than the lowest resonance frequency f ₀ of mosquitoes 6.
Note that the high-frequency cut-off frequency f _RH and the low-frequency cut-off frequency f in the rear high-cut and low-cut filter 2.
The relationship between _RL , f _RL > f _RH , f _RH ≦ 200 Hz, is the same as in the above-described embodiment.

With such a configuration, even if the low-frequency (heavy bass) signal component in the front signal is not cut by the front low-cut filter 1, the low-frequency (heavy bass) signal component is relatively high. Since it is substantially cut by the front-located speaker 5 having the lowest resonance frequency f ₀ , the same operation as in the above-described embodiment can be performed, and the sound image localization of the bass signal in the reproduced sound signal is conventionally This type of device has an effect that it can be shifted considerably forward as compared with this type of device, and that it is possible to reproduce a low tone having a sufficiently abundant sound volume.

In the above embodiment, the description has been given that the means for enhancing the bass signal in the rear signal is constituted by the voltage amplifier 7. However, the means for enhancing the bass signal is not limited to this. Of course, other configurations may be employed as long as the configuration can enhance the bass signal compared to other signals.

Further, a voltage amplifier 7 having a variable gain is used in place of the voltage amplifier 7 having a fixed gain,
It may be possible to adjust the enhancement level of the high cut signal according to the preference of the user.

[0025]

As described above, the present invention reproduces only the rising part (contour) of the bass signal by cutting the bass (heavy bass) signal component in the forward signal. As for the rear signal, since the bass signal in the rear signal is enhanced to reproduce the rich and rich bass signal with unclear sound image localization, the sound image localization of the bass signal is This makes it possible to regenerate a bass sound which moves considerably ahead of the apparatus and has a sufficiently rich volume in terms of hearing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an on-vehicle sound reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing another embodiment of the in-vehicle sound reproducing device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-cut filter for front signals 2 High-cut and low-cut filters for rear signals 3 Power amplifier for front signals 4 Power amplifier for rear signals 5 Speakers arranged in front 6 Speakers arranged in rear 7 Voltage amplifier 8 Signal addition Container 9 Front signal input terminal 10 Rear signal input terminal 21, 22 Output terminal

Claims (2)

(57) [Scope of request for utility model registration] 1. A two front placing the acoustic signal consisting of a forward signal and a backward signal to the left and right before and after each car
In-vehicle sound reproduction apparatus for reproducing a speaker and two rear speakers, the front signal low cutoff frequency
Low-cut at several f _FL and add to the front speaker
In means and the low pass cut-off frequency f _RL from the rear signal
Low cut low cut signal and high cutoff frequency
Forming a high-cut signal that is high-cut at several f _RH , then enhancing the high-cut signal and adding it to the low-cut signal, and adding this added signal to the rear speaker
And a cut-off frequency f _FL , f _RL , f _RH
Characterized in that a relationship of f _RL > f _RH ≧ f _FL is established between the two . 2. Two fronts in which acoustic signals composed of a front signal and a rear signal are arranged on each of the left and right sides of the front and rear of the vehicle, respectively.
In the in-vehicle sound reproducing device for reproducing with a speaker and two rear speakers , as the front speaker ,
At least 10H above the lowest resonance frequency of the rear speaker
Select the one with the lowest resonance frequency higher than z
Signal is prevented from being reproduced, and, from the rear signal
Forming a low-cut signal low-cut at a low- frequency cut-off frequency f _RL and a high-cut signal high-cut at a high-frequency cut-off frequency f _RH , and then enhancing the high-cut signal and adding it to the low-cut signal ; This sum signal is
So that it can be added to the rear speakers and each of the cutoffs
Between the frequencies f _RL and f _RH , the relation of f _RL > f _RH is given.
An on-vehicle sound reproducing apparatus characterized in that: