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JPH08163688

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DESCRIPTION JPH08163688
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound field correction apparatus for vehicle-mounted audio equipment. More specifically, the
present invention relates to a sound field correction apparatus that enables correction in
accordance with the shape, size, and the like of a vehicle interior space.
[0002]
2. Description of the Related Art The acoustic characteristics in the passenger compartment
differ from vehicle type to vehicle type. That is, due to the shape and size of the cabin interior
space, particularly the narrowness of the cabin interior, standing waves are generated in the
audible frequency band, so the sound emitted from the loudspeakers installed inside the cabin is
affected. What has been equalized by the audio device may not be transmitted to the listener as
desired. FIG. 2 is a diagram showing an example of transmission characteristics in a vehicle
compartment. For the above reason, the audio frequency emitted from the audio equipment in
the flat characteristic becomes a characteristic having a peak-dip at the listener position as
shown in the figure, and is transmitted to the listener with the sound quality deteriorated.
[0003]
In order to correct the above-mentioned deterioration of the sound quality, an equalizer is
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attached to the sound device so that the sound quality can be adjusted to the optimum sound at
the listener position, and the listener adjusts the equalizer to adjust the f characteristic of the
audio signal from the sound device. After the change, a method of playing from a speaker is
taken. FIG. 3 shows an example of such a device, in which the left and right audio signals L and R
are adjusted by the respective equalizers and then reproduced from the speakers via the
respective amplifiers.
[0004]
In such a device, the listener must equalize the optimal f characteristics according to the vehicle
type, but the adjustment is not only surprisingly difficult and complicated, but what the listener
adjusts is really what is desired for the music source In many cases, it can not be determined
whether the characteristics are met. For this purpose, a system has been conceived for obtaining
a desirable f characteristic according to the type of vehicle at the acoustic device installation
stage.
[0005]
For example, Japanese Patent Application Laid-Open No. 60-189396 discloses an apparatus
capable of sound field correction according to vehicle type. In the above device, the equalizer
circuit that corrects the sound field is divided into a main part and a correction unit part that
determines the equalizer characteristics, and the main part conforms to the specifications
common to each car type, By preparing multiple types of compatible characteristics and
detachably connecting the correction unit of the required characteristics to the main body
according to the vehicle type, it is intended to listen to the sound field adapted to each vehicle
type without adjustment. It is
[0006]
Apart from this, in recent years, with the advent of DSP (digital signal processor) etc., after sound
quality processing is performed with digital signals, correction for each vehicle type due to
differences in car size, shape, etc. is made in advance. There is a case in which data to be a value
is stored in a memory, and a correction value is selected from the data to perform sound field
correction as desired.
[0007]
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FIG. 4 shows an example of the case where the correction signal subjected to the DSP processing
is output to the speakers installed in the front and back of the vehicle interior.
As shown in the figure, after audio signals of one or two channels are converted to digital form
by A / D converter 1, D / A converters 3 and 4 become an analog signal through DSP 2 and both
amplifiers 5 and 6 Then, for example, it is outputted to the front side speaker and the rear side
speaker. On the other hand, the microcomputer 10 operates the DSP, and the microcomputer 10
operates according to a signal selected by the vehicle type selection switch 9 for the vehicle type,
reads the correction value for each vehicle type from the memory 11, and operates the DSP. As a
result, by operating the vehicle type selection switch 9 in accordance with the vehicle type,
desirable f characteristics suitable for the vehicle type can be obtained.
[0008]
In the above method, from the memory capacity, the speaker is stored in the memory on the
assumption that the mounting position of the speaker is, for example, at the lower part of the
door on the front side and the rear parcel part on the rear side. It is a thing. However, not only
the same vehicle type may be set by replacing the above position, but also the same acoustic
device may be installed in another vehicle type. Therefore, if the mounting position of the
speaker is changed according to the above-described assumed position, not only correction can
not be suitably made, but also there is a risk of deterioration. In addition, even if the mounting
position of the speaker is different even if it is the same vehicle type, it affects the acoustic
characteristics. Therefore, in order to solve this, a plurality of correction values are set according
to the mounting position of the speaker even in the same vehicle type. The husband must be
stored in memory. That is, correction values must be provided in accordance with the individual
speaker mounting positions, and a large amount of data is required even for the same vehicle
type. Furthermore, installing the same audio equipment in different vehicle types requires a
large-capacity storage device.
[0009]
Therefore, the present invention has been made to solve the problems of the prior art as
described above, and is optimum for various vehicle types and mounting positions of speakers
while having a small storage capacity. It is an object of the present invention to provide a sound
field correction device for vehicle-mounted audio equipment that provides a sound field.
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[0010]
According to the present invention, there is provided an on-vehicle sound field correction
apparatus for correcting a vehicle compartment to a predetermined sound field characteristic,
comprising: correction data on a front side of a vehicle interior and a rear part A storage means
for storing a plurality of correction data on the side individually and a selection means for
independently reading out data of the correction data on the front side and the correction data
on the rear side of the storage means The main point is to
[0011]
According to the present invention, the sound field correction device of the vehicle-mounted
acoustic device separates the correction data on the front side and the correction data on the
rear side of the vehicle compartment, stores them individually and individually. By reading out, it
is possible to provide an optimum sound field for various vehicle types and mounting positions of
speakers while having a small storage capacity.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an embodiment of the
sound field correction device according to the present invention in contrast to FIG.
The same description as the conventional example is omitted.
[0013]
In FIG. 1, reference numeral 20 denotes a microcomputer, and 21 denotes a memory constituting
storage means for individually storing a plurality of correction data on the front side and a
plurality of correction data on the rear side in the vehicle compartment.
22 is a selection switch for the front side speaker, 23 is a selection switch for the rear side
speaker, and the husband is a selection means for reading out the data of the correction data of
the front side of the storage means and the correction data of the rear side independently.
Configured.
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[0014]
In the present invention, a front speaker selection switch 22 and a rear speaker selection switch
23 are provided instead of the vehicle type selection switch shown in the conventional example,
and the microcomputer 20 corrects in advance stored in the memory 21 each time the switch is
switched. Read data and operate on DSP2.
The DSP processes audio data input through the A / D converter 1 based on the data and outputs
the audio data from the front and rear speakers via the D / A converters 3 and 4 and the
amplifiers 5 and 6 .
[0015]
The correction data is attached to speakers of various sizes that can be attached at each expected
mounting position in the vehicle cabin of various types of vehicles, and is separately measured
for front speaker correction and rear speaker correction, and based on this measurement data
Memory storage setting values are defined and stored separately in the memory. For example,
various types of vehicles such as sedans, station wagons, 1BOXs, minicars, etc. are selected as
vehicle types. As for the mounting position, the door is mainly selected in the front speaker, but
in the rear speaker, various mounting positions such as parcels, doors, stradds and boards are
selected according to the vehicle type, and the aperture of the speaker is also 6.5 A variety of
speakers expected to be installed are selected, such as 1-way or 2-way inch, 4-inch type and
elliptical type speakers.
[0016]
In the above, for example, assuming that a sedan is selected as a car type, 1 way and 2 ways as
front speakers attached to a door, and parcels and doors selected as rear speaker attachment
positions, and correction measurement data is stored in the memory, front speaker correction
Two types of data for data and two types of data for rear speaker correction are obtained. If this
is freely combined with the front speaker selection switch 22 and the rear speaker selection
switch 23, a correction value consisting of a combination of four types of correction data can be
obtained.
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[0017]
This means that the storage data is only half as compared to the case where the front and rear
data are held together. That is, in this case, if the storage amount is the same, the types that can
be set as the correction value can be doubled as compared with the conventional device.
[0018]
In the above case, a car type having a front speaker and a rear speaker is described, but in a car
type without a front speaker, only the rear speaker selection switch 23 corresponding to the rear
speaker may be selected.
[0019]
Although the case of the DSP has been shown in the above embodiment, the DSP may be
replaced by an equalizer.
[0020]
As described above, according to the configuration of the present invention, the transmission
characteristics can be easily corrected according to the various vehicle types and the mounting
positions of the speakers, so that it is preferable regardless of the shape, size, etc. in the vehicle.
It can be listened to by an acoustic characteristic.
[0021]
Further, the sound field correction device for a vehicle-mounted acoustic device according to the
present invention separates the correction data on the front side and the correction data on the
rear side in the vehicle compartment, and stores the correction data individually as a correction
value. It is economical because it can increase the number of types that can be set and provide
suitable acoustic characteristics.
[0022]
Brief description of the drawings
[0023]
1 is a diagram of an embodiment of the sound field correction device of the present invention.
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[0024]
2 is a diagram showing an example of transmission characteristics in the vehicle compartment.
[0025]
3 is a diagram of a conventional vehicle-mounted equalizer.
[0026]
4 is a diagram of a conventional vehicle-mounted sound field correction device.
[0027]
Explanation of sign
[0028]
2 DSP 220 Microcomputer 21 Memory 22 Front Speaker Selection Switch 23 Rear Speaker
Selection Switch
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