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JPS6297414

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DESCRIPTION JPS6297414
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle sound quality correction method used in an audio reproduction apparatus or the like
provided in a vehicle compartment of a car. The acoustic characteristics in the prior art vehicle
interior are generally different from the sninning room, i have narrow acoustic chambers, various
factors such as the reflection of a car window, etc., and have unique acoustic characteristics. In
order to correct the acoustic characteristics in the passenger compartment, conventionally, a 1 иии
control circuit having the characteristic shown in FIG. 8 or a graphic equalizer having the
characteristic shown in FIG. 9 has been used. Problems to be Solved by the Invention However,
when using the tone control circuit having the characteristics shown in FIG. Without C, there was
a drawback of bamboo where the peak at 2oO-300 Hz is emphasized. Dimensioned, shown in
Figure 9! Among the graphic equalizers with 14 characteristics, frequency f, I: for fixed Q values,
the appropriate complement + L is a poor shoe, and-also, frequency f and Q values You can set
up a single TV, and you can measure the listening point characteristics of the middle room 1-1
and the whole reproduction frequency band f,! -X Q ?? adjustment [7 must be, because there
are a lot of adjustment parts, adjustment work is complicated, and the defect that there is no film
property-1 ░ The present invention eliminates the above-mentioned conventional defects, This
acoustical ease is used as a transmission characteristic from the position of the speaker to the
position of the listening point by finger pressing, and correction of the transmission
characteristic is also made by including the difference depending on the position of several
phrases of the speaker and the type of car. An object of the present invention is to provide an onvehicle tone correction method capable of improving the tone quality. MEANS FOR SOLVING THE
PROBLEMS In order to achieve the above object, the present invention achieves the resonance
characteristics with a center frequency of 60 to 60 m and a resonance sharpness of 1 to 2 and a
center frequency of 200 to soo ++! Use a circuit with resonance characteristics of 1 to 2 and the
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input to a speaker provided in the vehicle cabin is amplified by 5 to 10 dB at the center
frequency of 50 to 60 fields, and 6 at the center frequency of 200 to 30 o ++ z It attenuates by
10 dB. Operation The present invention can correct the frequency characteristics regardless of
the vehicle type and the speaker installation point by the method described above. Embodiment
An on-vehicle tone quality correction method according to an embodiment of the present
invention will be described with reference to the drawings. FIGS. 2A and 2B show installation
examples of the speaker in the vehicle cabin. In FIG. 2A, B, a, b. C shows an installation point of
the speaker, a is an installation point of the rear parcel tray, b-th, no-urouid, and C is a
installation point of Genoschovo-1 и.
Fig. 3 shows the transmission characteristics of the sound source installed on the parcel tray (7).
? The sound pressure frequency characteristic at the listening point when the speaker having
the sound pressure frequency characteristic shown in FIG. 4 is installed in the rear parcel tray
becomes the characteristic shown in FIG. Due to the difference between B and C, the frequency
characteristics at the listening point become different from A, B and C as shown in FIG. As
apparent from FIG. 5, in the frequency band of 300 f) z or less, the characteristics become
constant regardless of the type of car, and the special frequency / 1 frequency J in the frequency
band H of 300 Hz 'or more and U by the width f small. Become. In order to make the sound
pressure frequency characteristics of each of the vehicles 4'1liA, B, and C shown in FIG. 5 flat and
flat, the center frequency f = 50 in any of the vehicle types A, B, and C in 300111 and after.
6011. Then, a circuit having a resonance characteristic of Q = 1 to 2 is provided and boosted, and
a circuit having a resonance characteristic of Q-1 to 2 is provided and eliminated from f?200 to
3001 L. It has become clear from measurements of many other types of vehicles that the
characteristics below 300 Hz are universal characteristics common to all models except A, B and
C. Furthermore, even if it is considered that 1 wavelength of 3 o O 1 l / is about 1 m, it can be
understood that there is almost no difference by vehicle type and attachment by position in this
wavelength unit. 0 In the case of correction, it is possible to almost correct with the abovementioned certain characteristics without measuring or listening to the music under 300 + h or
less. On the other hand, for 3001 L or more, the following correction is performed for each
vehicle type. In model A, f = 500 Hz. While providing and boosting a circuit having a resonance
characteristic of Q-2, a correction is performed to boost with a circuit having a resonance
characteristic of f = 2 KHz and Q = 2. Also, in model B, f = 650 fields. The correction is made
using a circuit having a resonance characteristic of Q = 1.5 and f = 3, KHz, Q = 1.6. Furthermore,
in the model C, f ,,, 500 Hz. It correct | amends by the resonance circuit of Q = 2. FIGS. 6 and 7
show the transmission characteristics when sound sources are installed on the cowl side b and
the dash board C in FIGS. 2A and 2B, respectively. The following table is a table summarizing
each of the correction functions. FIG. 1 shows an example of correction characteristics of the
correction apparatus for realizing the on-vehicle tone correction method of the present invention.
The correction characteristic Ul of this correction device, as shown in part A of the table, p (, 300
tiz CJ, below, center frequency f-50 6 01!!
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A circuit having a resonance characteristic of Q = 1 to 2 is boosted to boost the resonance
characteristic of Q-1 to 2 with a center frequency of f-200 to 30 o 1] l It has a characteristic of
providing 6-10 dB eliminance (attenuation). Furthermore, in the case of 300 Hz or less, f-650I, Q2 and f = 2 KHz, Q shows the correction characteristics of the complementary IT- circuit having
resonance characteristics of Q = 2. -As is clear from the table, regardless of the vehicle type circle
и, J stepping speaker installation point, f = so -601 (7, Q = 1 to 2 and f = 2oo to 300H7, as is clear
from the table). The frequency characteristics below 3 oOIL are corrected by the circuit having
the resonance w 'characteristics of Q-1 to 2, f = ts 800 0 to 800 fiz, Q = 1 to 3 and f = 1.5 to 3
KHz, Q = 1 to 2 Correct the frequency characteristics of 30 o 1] 7 2 or more by using a circuit
with 3 resonance characteristics, and even if the vehicle type and the installation point of the
speaker are different, for the correction of a small correction point]: S, easily It has the advantage
of being able to easily improve the sound quality of the middle room [7]. According to the
present invention, the resonance characteristics have a center frequency of 50 to 60 Hz and the
resonance sharpness is 1 to 2, and the resonance frequency of 200 to 300 Hz and a resonance
frequency of 1 to 2 The input to a speaker with a circuit having resonance characteristics of 1 J
(7, provided in the vehicle compartment) is amplified by 5 to 10 dB at the center frequency of 60
to 60 Hz, and at the center frequency of 200 to 300 to Attenuation by 5 to 1 o dB J: Correction
of transmission characteristics of less than 117, for example, less than 300 Hz can be easily
performed regardless of the difference due to the position of speakers 11 '& 4 и 1 in the car room
and the type of resistance. , It is possible to improve the sound quality of in-room listening. 1 If
the correction method of the present invention is used, if the characteristics below about 3001(z or so are corrected in advance, even if the car type and the attachment of the speaker are
replaced with cans, only for frequencies of 3001 or more and 3 or more It suffices to correct the
transmission characteristics, and has the advantage that the adjustment operation is extremely
easy.
[0002]
Brief description of the drawings
[0003]
1C4, correction characteristics of the correction device for realizing the vehicle-mounted sound
quality correction method according to an embodiment of the present invention, FIGS. 2A and 2B
are diagrams showing speaker installation points in a vehicle compartment of a car, and FIG. Fig.
4 shows the transmission characteristics in the passenger compartment, Fig. 4 shows the
frequency characteristic of the speakers installed in the passenger compartment, Fig. 5 shows the
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sound pressure frequency characteristics at the listening point when the speakers are installed in
the rear parcel tray in the passenger compartment Fig. 6 shows the sound pressure frequency
characteristics at the listening point when the speaker is installed on the cowl side in the vehicle
compartment, and Fig. 7 shows the sound pressure frequency characteristics at the listening
point when the speaker is installed on the dash board in the vehicle interior. FIG. 8 is a frequency
characteristic diagram of a conventional tone control circuit, and FIG. 9 is a frequency
characteristic diagram of a graphic equalizer.
?????????????????????????????????????? Name of
agent Attorney Nakao Toshio and 1 other person Figure 1. ZOSo foo 200.3006110 / '2' Jti 17 'E
(71z) Figure 2 Figure 6 Figure 3 Figure 4 Figure 8 Shoulder Huo (Fig. 9)
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