JPS6297414A - Correcting method for sound quality of on-vehicle equipment - Google Patents

Abstract

PURPOSE:To improve the quality of sound to be listened in a cabin by using a circuit having the resonance characteristic where the center frequency is 50-60Hz and the resonance sharpness is 1-2 and the center frequency is 200-300Hz and the resonance sharpness is 1-2. CONSTITUTION:The circuit having the resonance characteristic where the center frequency is 50-60Hz and the resonance sharpness is 1-2 and the resonance characteristic where the center frequency is 200-300Hz and the resonance sharpness 1-2 is used. The input to a speaker provided in the cabin is amplified by 5-10dB at the center frequency of 50-60Hz, and attenuated by 5-10dB at the center frequency of 200-300Hz, and the correction of the transmission characteristic at a prescribed frequency (e.g., >=300Hz) is facilitated independently of the mounting location of a speaker in the cabin and of the kinds of automobiles to improve the sound quality.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an in-vehicle sound quality correction method used in a sound reproducing device installed in a vehicle interior of an automobile.

2. Description of the Related Art The acoustic characteristics of a vehicle interior differ from those of a general acoustic room, and have unique acoustic characteristics due to various factors such as the narrowness of the interior and exterior cabins, and reflections from the vehicle windows.

In order to correct the acoustic characteristics within the vehicle interior, conventionally a 1-tone control circuit having the characteristics shown in FIG. 8 or a graphic equalizer having the characteristics shown in FIG. 9 has been used.

Problems to be Solved by the Invention However, when using a tone control circuit having the characteristics shown in FIG. Without C, 2oO~300
Bamboo had the disadvantage that the peak at Hz was emphasized.

As shown in Figure 9! Among the graphic equalizers with 14 characteristics, in the case where the frequency f,, I:Q value is fixed, it is difficult to find an appropriate complement + L, and 1, -. German＼rVC setting possible TVl, the listening point characteristics of the middle room were measured for each unit. -x Q Adjustment with the candy [7] There are many adjustment parts, so the adjustment work is complicated, - Is it a disadvantage that there is no film property? - The present invention eliminates the above-mentioned conventional disadvantages, This acoustic ease can be used as the transmission characteristic from the speaker position to the listening point, and by correcting the transmission characteristic including differences depending on the position of the speaker and the type of car, it is possible to improve listening in the vehicle. The present invention aims to provide an in-vehicle sound quality correction method that can improve sound quality.

Means for Solving the Problems In order to achieve the above object, the present invention has a center frequency of 60 to 6
01m, resonance characteristics with resonance sharpness of 1 to 2 and center frequency of 2
00~soo++,! Using a circuit with resonance characteristics with a resonance sharpness of 1 to 2, the input to the speaker installed in the vehicle interior is amplified by 5 to 10 dB at a center frequency of 50 to 60 degrees.
It is attenuated by 6 to 10 dB at the center frequency of 00 to 30o++z.

Effects of the present invention By the method described in ``-'', the frequency characteristics can be corrected regardless of the vehicle type and the speaker installation point.

Embodiment Hereinafter, an in-vehicle sound quality correction method according to an embodiment of the present invention will be described with reference to the drawings.

FIGS. 2A and 2B show an example of installing a speed sensor in a vehicle interior. In Figure 2 A and B, a and b.

C indicates the installation points of the speakers, where a is the rear parcel tray, B is the installation point of Nonowurzide, and C is the installation point of Genoshbo-1.

Figure 3 shows the transmission characteristics when the sound source is installed in the rear parcel tray. The overall sound pressure frequency characteristic at the fifth point is
The characteristics are shown in the figure, and the car type is A.

Due to the difference between B and C, the frequency response at the listening point is 6th.
As shown in the figure, A, B, and C have different characteristics. As is clear from Figure 5, in the frequency band below 300f)z, the characteristics are constant regardless of the vehicle type, and 3
Special A/1 temperament J in the frequency band H above 00Hz',
It becomes U depending on the width f.

In order to flatten the sound pressure frequency characteristics of each vehicle 4'1liA, B, and C shown in FIG. ~6011. boost by providing a circuit with resonance characteristics of Q = 1 to 2, and f-200 to 3001
Eliminate by providing a circuit having resonance characteristics of Q-1 to Q-2 at L.

It has been revealed through measurements of many other vehicle types that this characteristic below 300 Hz is a universal characteristic that is common to vehicle types other than vehicle types A, B, and C.

Furthermore, considering that one wavelength of 3oO1l/ is approximately 1m, it can be seen that there is almost no difference depending on the car model in this wavelength unit, and there is almost no difference depending on the mounting position. In other words, the listening point characteristics in the car interior When correction is to be made, it is possible to make most of the corrections at 300 + hours or less without any measurement or trial listening due to the above-mentioned certain characteristics.

On the other hand, for 3001L or more, the following correction is performed for each vehicle type. For vehicle type A, f=500Hz.

A circuit having a resonance characteristic of Q-2 is provided to perform boosting, and a correction is performed by boosting by a circuit having a resonance characteristic of f=2 KHz and Q=2.

In addition, for car type B, f=650.

Q=1.5 and f=3 KHz, Q=,
A circuit having a resonance characteristic of 1.6 is used for correction.

Furthermore, in car type C, f..., 500Hz.

This is corrected using a resonant circuit with Q=2.

6 and 7 show transmission characteristics when sound sources are installed on cowl side b and dash board C in FIGS. 2A and 2B, respectively.

The following table summarizes each of the above-mentioned correction functions. FIG. 1 shows an example of the correction characteristics of a correction device that implements the in-vehicle sound quality correction method of the present invention.

The correction characteristic Ul of this correction device is p(
,300tiz CJ, below, center frequency f-5
0-6011. ! A circuit with a resonance characteristic of Q=1 to 2 is provided to boost (amplify) it by 5 to 10 dB, and a circuit that irritates the resonance characteristic of Q-1 to 2 at a center frequency f-200 to 30o1]l is provided. 6 to 10 dB elimination
) (attenuation). In addition, 30
For frequencies below 0 Hz, f-650I, Q-2 and complementary I with resonance characteristics of f=2 KHz and Q=2 are used.
T-, shows the correction characteristics of the circuit.

” - As is clear from the table, this example is for car models round.
Regardless of the J Kobi speaker installation point, f = so ~ 601
(7,, Q = 1 ~ 2 and f = 2oo ~ 300H7
,.

3oOI due to the circuit having resonance w' property of Q-1~2
Correct the frequency characteristics below L, f=ts○0~800f
iz, Q = 1~3 and f = 1.5~3K
It uses a circuit with resonance characteristics of Hz, Q = 1 to 3 to correct frequency characteristics of 30o1]7 and above, and even if the car model and speaker installation point are different, it can correct a small number of correction points. ]: It can be easily supplemented, and it has the advantage of easily improving the sound quality in the middle room.

The effectiveness of the invention is 31 = sea urchin, the invention is 1 no. 1, and the center frequency is 5.
A circuit with a resonance characteristic with a resonance sharpness of 1 to 2 at a frequency of 0 to 60 Hz and a resonance characteristic with a resonance sharpness of 1 to 2 at a center frequency of 200 to 300Hz was installed (7, installed in the vehicle interior) at 1°. Input to the speaker at the center frequency of 60 to 60 Hz.
It is amplified by 10 dB and attenuated by 5 to 1 dB at the center frequency of 200 to 300 degrees. Regardless of the position of the speaker in the vehicle interior and the type of speaker, the specified value is 117 or less. For example, transmission characteristics of frequencies below 300 Hz can be easily corrected, and the sound quality heard inside the vehicle can be improved.

1. If you use the correction method of the present invention, 300
1-(If you correct the characteristics below about z, the car model and speaker installation will be 3001 and 3 even if the can is replaced.
This method also has the advantage that it is only necessary to correct the transmission characteristics for the above-mentioned frequencies, making adjustment work extremely easy.

[Brief explanation of drawings]

FIG. 1 C4 is a correction characteristic diagram of a correction device that implements an in-vehicle sound quality correction method according to an embodiment of the present invention; FIGS. 2A and B are diagrams showing speaker installation points in a vehicle interior;
The figure shows the transmission characteristics in the vehicle interior, Figure 4 shows the frequency characteristics of the speaker installed in the vehicle interior, and Figure 5 shows the sound pressure frequency at the listening point when the speaker is installed in the rear parcel tray in the vehicle interior. Figure 6 shows the sound pressure frequency characteristics at the listening point when the speaker is installed on the cowl side of the vehicle interior, and Figure 7 shows the sound pressure frequency characteristic at the listening point when the speaker is installed on the dash board inside the vehicle interior. Figure, 8th
The figure is a frequency characteristic diagram of a conventional tone control circuit, and FIG. 9 is a frequency characteristic diagram of a graphic equalizer. a... Rear parcel tray, b... Cowl side, C. Datsushi board. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure ZOSo foo 200.3006110 /'
2'Jti17'E (71z) Fig. 2 Fig. 6 Fig. 3 Fig. 4 Fig. 5 Fig. 8 Shoulder foot (Fig. 9 Thought ball)

Claims (1)

[Claims] Resonant characteristics with a center frequency of 50 to 60 Hz and a resonance sharpness of 1 to 2, and a center frequency of 200 to 300 Hz and a resonance sharpness of 1.
Using a circuit with a resonance characteristic of ~2, the input to the speaker installed in the vehicle interior is set at the center frequency of 50 to 60 Hz.
An in-vehicle sound quality correction method characterized by amplifying by ~10 dB and attenuating by 5 to 10 dB at the center frequency of 200 to 300 Hz.