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JPH11289593

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH11289593
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle audio reproduction apparatus for reproducing sound in an optimum sound field even
for a cabin having different sound field characteristics.
[0002]
2. Description of the Related Art The sound field characteristics in the passenger compartment
vary greatly depending on the type of car, and the size and shape of the passenger compartment
differ greatly. For this reason, when the vehicle-mounted audio reproduction device is installed in
the vehicle compartment, it is necessary to correct the difference in the sound field
characteristics in the vehicle compartment. Conventionally, the correction of the sound field
characteristic is performed so that the user operates the sound field adjustment knob provided
on the operation panel of the in-vehicle audio reproduction device while listening to the sound,
and the sound field suitable for the vehicle compartment is reproduced. It was decided.
[0003]
As a correction method for adjusting the sound field, for example, for the purpose of correction
of frequency characteristics in which an audio band is divided into a plurality of frequency bands
like a graphic equalizer and the audio reproduction level can be varied for each divided
frequency band. There is something that
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[0004]
In addition, a method is also conceivable that can be easily conceived of a method of storing
correction data of frequency characteristics different for each vehicle type in a storage circuit,
reading out the corresponding correction data from the storage circuit according to the vehicle
type to be installed is there.
In this case, it is possible to use a tone control circuit constituted by an analog element or a
digital signal processing circuit such as a DSP as the reproduction circuit.
[0005]
FIG. 4 is a view showing the overall configuration of a conventional in-vehicle audio reproduction
apparatus. In FIG. 4, the correction data of the vehicle type is stored in the storage unit 7, and the
correction data is read out by the control unit 6 and transferred to the correction circuit unit 9
via the interface unit 8. The correction data transferred is used as a setting constant of the sound
field characteristic of the correction circuit unit 9. The audio signal corrected by the correction
circuit unit 9 is amplified by the amplifier circuit unit 11, drives the front speaker 13 and the
rear speaker 14, and is reproduced as sound. The vehicle type selection unit 15 has an operation
button for selecting and specifying a vehicle type. The input selection unit 17 has operation
buttons for switching between the tuner 2 which is an audio reproduction device, the CD / MD
player 3, the tape deck 4, and the external input terminal 5. Further, the control unit 6 controls
the input switching unit 1 and makes connection with the instructed audio reproduction device.
[0006]
In the configuration of the conventional example described above, although the characteristics of
the sound field can be easily changed by using the correction data stored in the storage unit 7,
the phase of the reproduction signal in the vehicle interior of the selected vehicle type is
reflected Changes can not be easily corrected.
[0007]
Further, as a prior art for correcting the sound field characteristic in the vehicle interior,
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2
Japanese Patent Application Laid-Open No. 60-189396 (vehicle-mounted sound correction
device) is disclosed.
According to the invention, it is described that the correction unit of the frequency characteristic
that matches the sound field characteristic of the vehicle interior to be installed is selected and
incorporated in advance in the sound reproduction device main body and the sound reproduction
device is installed in the vehicle interior ing.
[0008]
However, in the prior art correction method involving manual adjustment operation, the means
for setting the correction value in accordance with the vehicle compartment relies on the user's
audition, so that appropriate correction can be performed. Since the setting operation of the
correction value may be ended without being performed, it may not be used in the state of the
optimum sound field characteristic.
[0009]
Also, if a correction unit predetermined in a vehicle type described in Japanese Patent
Application Laid-Open No. 60-189396 is incorporated in the device, an appropriate sound field
can be obtained when the user installs the device by changing the vehicle type. There is a
problem that voice reproduction can not be performed by the characteristics.
[0010]
Further, among the above-described conventional techniques, if correction data set in advance
for each vehicle type is stored in the storage circuit, and then the vehicle type is selected and the
correction data is read out from the storage circuit and corrected, Although it can be improved,
only inadequate sound field characteristics can be obtained in the following points.
[0011]
As one of them, since the audio signals output from the front and rear speakers are output from
the correction circuit set using the same correction data, the direct audio signal from the rear
speakers and the rear glass surface are output. When the sound signal from the front speaker
reflected by the light source is synthesized in the space of the vehicle interior, the sound signal
may be out of phase as compared with the direct sound signal from the rear speaker.
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As a result, there is a problem that the sound quality of the audio signal in the vehicle
compartment is deteriorated.
[0012]
Also, in the prior art, when a manual setting is performed to manually adjust the sound field
characteristics and then a car model different from the setting time is selected and reproduced,
the manually set data before changing the car type is Since the sound remains effective, the
sound field characteristic largely deviates from the original, and it is necessary to reset the
manual setting or cancel the manual setting data.
Similarly, when the power is turned off and then turned on again, the data of the manual setting
is lost, and it is necessary to perform the manual setting again.
[0013]
The present invention has been made in view of the foregoing, and it is an object of the present
invention to provide an on-vehicle audio reproduction device that matches the phase of an audio
signal at a listening position with a simple configuration and prevents sound quality deterioration
of reproduced sound in a vehicle compartment. I assume.
[0014]
According to the present invention, there is provided an on-vehicle audio reproduction apparatus
having a sound field correction unit for correcting a sound field characteristic in a vehicle
compartment to a predetermined characteristic, wherein the sound field correction unit is a front
speaker in the vehicle compartment. Correction data for a plurality of vehicles as one set of
correction data for setting the characteristics of the correction circuit for the front speaker and
the correction circuit for the rear speaker. Vehicle-mounted audio reproduction having storage
means stored in the storage unit, and control means for reading out the correction data specified
by the selection means for selecting a vehicle type from the storage unit and setting the
characteristics of the correction circuit It is an apparatus.
[0015]
Further, according to the present invention, there is provided an on-vehicle audio reproduction
device having a sound field correction unit for correcting a sound field characteristic in a vehicle
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compartment to a predetermined characteristic, wherein at least the correction circuit unit for
the front speaker among the correction circuits. This is an on-vehicle audio reproduction device
having a phase correction circuit unit or a delay circuit unit.
[0016]
Further, according to the present invention, in the in-vehicle audio reproduction device having a
sound field correction unit that corrects the sound field characteristic in the vehicle compartment
to a predetermined characteristic, the correction data of a plurality of vehicle types stored in the
storage unit The vehicle-mounted audio reproduction device is data in which the phase and the
level of the audio signal in FIG.
[0017]
Further, according to the present invention, in the in-vehicle audio reproduction device having a
sound field correction unit that corrects the sound field characteristic in the vehicle compartment
to a predetermined characteristic, the correction data of a plurality of vehicle types stored in the
storage unit The vehicle-mounted audio reproduction device is data in which the phase and level
of the audio signal in the vehicle are different for each vehicle type.
[0018]
Further, according to the present invention, in the in-vehicle audio reproduction device having a
sound field correction unit that corrects a sound field characteristic in a vehicle compartment to
a predetermined characteristic, the control unit adds adjustment data to correction data of a
selected vehicle type. The on-vehicle audio reproduction device controls the characteristics of the
correction circuit.
[0019]
Further, according to the present invention, in the in-vehicle audio reproduction device having a
sound field correction unit that corrects a sound field characteristic in a vehicle compartment to
a predetermined characteristic, the storage unit stores correction data of the vehicle type and
adjustment data in different areas. And an adjustment means for arbitrarily changing adjustment
data.
[0020]
Further, according to the present invention, in a vehicle-mounted audio reproduction device
having a sound field correction unit that corrects a sound field characteristic in a vehicle
compartment to a predetermined characteristic, a selected vehicle type or adjustment is
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performed for a predetermined time when the power is turned on. It is a vehicle-mounted audio
reproduction apparatus which has a display means to display the content.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION In order to solve the problems of the prior
art, the embodiments of the present invention will be described below.
FIG. 1 is a whole block diagram showing an embodiment of the present invention.
In FIG. 1, the correction circuit unit 9 is a correction circuit of an audio signal output from the
front speaker 13, and the correction circuit unit 10 is a correction circuit of an audio signal
output from the rear speaker 14.
The correction data of the vehicle type is stored in the storage unit 7, and the control unit 6
reads the stored correction data and transfers it to the correction circuit units 9 and 10 via the
interface unit 8.
The transferred correction data is used as a setting constant of the sound field characteristic of
the correction circuit units 9 and 10.
The audio signal corrected by the correction circuit units 9 and 10 is amplified by the amplifier
circuit units 11 and 12, and the front speaker 13 and the rear speaker 14 are driven to be
reproduced as sound.
[0022]
The vehicle type selection unit 15 has an operation button for selecting and specifying a vehicle
type.
The input selection unit 17 has an operation button for instructing switching of the tuner 2
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which is an audio reproduction device, the CD / MD player 3, the tape deck 4, and the external
input terminal 5.
The display unit 18 is a display for displaying the mode setting state and the reproduction state
of the recording and reproduction apparatus.
The control unit 6 controls the input switching unit 1 and makes connection with the audio
reproduction device selected by the input selection unit 17.
[0023]
Further, the control unit 6 reads the front speaker correction data and the rear speaker
correction data stored in advance in the storage unit 7 as a pair from the storage unit 7, transfers
the correction data to the interface unit 8, and corrects the correction circuit unit Set 9, 10
characteristics.
[0024]
Further, the control unit 6 generates information set by the operation knob of the manual setting
unit 16 as adjustment data and stores the information in the storage unit 7, and when the
correction data is read from the storage unit, the correction data and the adjustment data are
Add and transfer to interface section 8.
[0025]
The correction data is data input to each of the adjustment circuit units 100, 101, 102, 200, 201
and 202 shown in the configuration of the correction circuit units 9 and 10 in FIG. 1, and the
content of the correction data is , Gain data in a low frequency domain in the voice band, gain
data in a wide frequency domain, gain data in the entire frequency band, and delay data of the
delay circuit 103.
[0026]
Although not shown as an example of the signal output by the operation of the operation knob
provided in the manual setting unit 16 described above, when the manual setting unit outputs a
digital signal using a rotary encoder or the like, the rotary encoder The digital data output
according to the rotational position or rotational speed of the controller is recognized as a signal
of setting change of adjustment data, and the control unit 6 converts it into a predetermined data
format by recognizing the signal of setting change and stores it in the storage unit. Remember.
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[0027]
When outputting an analog signal using a volume etc., after converting from an analog signal to
digital using an analog-digital converter, the control unit 6 converts it into a predetermined data
format and stores it in a storage unit .
Further, the data converted into the predetermined data format is displayed on the display unit
18 with a display symbol that can be recognized by the operator.
[0028]
In FIG. 1, when one of vehicle types such as sedan, wagon, sports, etc. is selected as the type
name of the vehicle type set by the vehicle type selection unit 15 of the panel operation unit 19,
the control unit 6 The correction data is read out from the storage unit 7 and the gain adjustment
circuit units 100 and 200 of the low frequency parts of the correction circuit units 9 and 10 and
the gain adjustment circuit parts 101 and 201 of the wide area frequency unit and the volume
adjustment circuit The characteristics of sections 102 and 202 and delay circuit 103 are set
respectively.
Each circuit unit is provided with registers 104 and 204 for storing correction data, and the
characteristics of each circuit are determined by the stored correction data.
Here, although the correction data of the front speaker 13 and the rear speaker 14 are set as
different data, the data may be the same depending on the vehicle type.
[0029]
Next, as the present embodiment, in addition to the setting of the sound field characteristic by
the vehicle type selection button, the manual setting unit 16 is provided which manually adjusts
the correction data in accordance with the preference of the listener.
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The data manually adjusted by the manual setting unit 16 is stored in the storage unit as
adjustment data attached to the correction data of the vehicle type separately from the correction
data of the vehicle type of the storage unit 7 via the control unit 6.
[0030]
The correction data and the adjustment data are stored in different areas of the storage unit
respectively, but after they are read out from the storage unit, the control unit adds the
correction data and the adjustment data and stores them in the respective registers. .
[0031]
When the power of the audio reproduction device is turned on, data obtained by adding the
correction data and adjustment data read from the storage unit is transferred to the correction
circuit unit, corrected based on the transferred data, and output from the reproduction device
The voice signal thus reproduced is reproduced as voice.
[0032]
The display unit 18 displays the vehicle type selected by the vehicle type selection unit 15.
Although not shown, the vehicle type can be easily determined by pressing the vehicle type
selection confirmation button.
[0033]
Further, the type name of the determined vehicle type is displayed for a certain period of time
when the power of the apparatus is turned on, and the vehicle type set by the operator can be
confirmed.
Further, by simultaneously displaying the contents of the manual adjustment described above, it
is possible to confirm whether the desired sound quality is obtained.
[0034]
FIG. 2 shows the strength H1 of the sound signal of the reflected sound when the sound signal
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from the front speaker is reflected on the back glass surface and the spatial strength B1 of the
sound signal generated from the rear speaker and the position P at which the sound is heard. Is a
diagram showing the relationship with the voice signal synthesized in FIG.
(A) of FIG. 2 shows the relationship between the level and the phase of the audio signal in the
case of the first vehicle type.
At the listening position P, an audio signal indicated by P1 causes a phase shift of θ with respect
to B1 due to the intensity B1 of the direct sound from the rear speaker and the intensity H1 of
the sound reflected from the rear glass surface It becomes.
B1, H1, P1 and A1 are represented by vectors having magnitudes and phases, respectively. Here,
A1 is a vector representing an audio signal at the listening position of the audio signal output
from the front speaker. Here, the audio signal P1 at point P is expressed by the following
equation. P1 (P1, θ) = | B1 | · Sin (ωt) + | H1 | · Sin (ωt + θ1)
[0035]
Next, FIG. 2B shows the relationship between the level and the phase of the audio signal in the
case of the second vehicle type. Assuming that the audio signal from the front speaker is the
reflected signal level | H2 | (in the figure, | H2 |> | H1 |) with respect to the audio signal B1 from
the rear speaker, the listening position P The phase shift of the audio signal due to the influence
of the reflected sound at is θ ′, and the audio signal at point P at this time is expressed by the
following equation. P2 (P2, .theta. ') =. Vertline.B1.vertline..sin (.omega.t) +.
Vertline.H2.vertline..sin (.omega.t + .theta.1) where .theta.'>. Theta.
[0036]
Next, as shown in (c) of FIG. 2, in the second vehicle type, the sound signal level | B1 | of the rear
speakers is increased to | B2 |, and the influence of the reflected sound at the listening position P
Can be made the same as that of the first vehicle type. The audio signal level at point P at this
time is expressed by the following equation. The phase shift θ of P3 (P3, θ) = | B2 | · Sin (ωt) +
| H2 | · Sin (ωt + θ1) P1 is a correction circuit for the front speaker with respect to the audio
signal output from the front speaker 2A, the audio signal A1 output from the front speaker and
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the audio signal output from the rear speaker and the reflected sound are output as shown in
FIG. 2A. The phases of the synthesized speech signal P1 and the reflected signal are made to
coincide with each other.
[0037]
Next, in order to make the audio signal of P3 shown in (c) of FIG. 2 the same size as (a) of FIG. 2,
the sizes of | A1 | and | B2 | are changed at the same ratio. Also good. The audio signal at the
listening position P at this time is expressed by the following equation. P1 '(P1', θ) = | B2 '| Sin
(ωt) + | H2' | Sin (ωt + θ1)
[0038]
As described above, the correction of the sound field characteristic is divided into the front
speaker and the rear speaker, and the output from the front speaker uses a phase correction
circuit or a delay circuit, and the correction from the rear speaker By varying the output level, it
is possible to eliminate the phase shift at the position P of the listener regardless of the type of
vehicle and to prevent the deterioration of the acoustic characteristics.
[0039]
Although the characteristics of the phase correction circuit have been described as being
constant in the above-described embodiment, the characteristics may be changed according to
correction data.
[0040]
As described above, even for a plurality of vehicle types in which the phase changes at different
positions where the sound signal output from the front speaker and the sound signal from the
rear are heard due to the reflection of the sound signal in the vehicle compartment, Adjust the
gain of the volume adjustment circuit or adjust the phase of the delay circuit so that this is the
same, and perform the gain adjustment of the low frequency part or the gain adjustment of the
high frequency part. Make the characteristics constant.
[0041]
In addition, the sound quality is changed according to the preference of the person who listens to
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the sound field characteristics in the passenger compartment by using a function capable of
further correcting the correction value preset according to the vehicle type with the data
adjusted manually. can do.
The above-described manual adjustment data is stored in a storage area different from the
correction data stored in advance in the storage unit 7 of FIG. 1, and the manual adjustment data
is updated each time the manual adjustment is performed.
[0042]
Next, the operation will be described using FIG. 3 which is a flowchart showing the operation of
the embodiment of the present invention.
When the vehicle type selection button provided in the vehicle type selection unit of the panel
operation unit is pressed for 2 seconds or more, the vehicle type setting mode is set, and the type
name of the first vehicle type set in advance is displayed on the display unit of the panel
operation unit.
(ステップS1、S2、S3)
[0043]
When the type name of the car type is displayed, the correction data of the sound field
characteristic of the displayed car type is read out from the storage unit. (ステップ4)
[0044]
Next, the vehicle type selection button is operated again, but after pressing the pressing time
within 2 seconds as a function different from the above, when the vehicle type selection button is
rotated, the type name of the second vehicle type is displayed. Furthermore, when the vehicle
type selection button is rotated, the third and fourth vehicle types are displayed in order. (ステ
ップS9,S10、13)
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[0045]
The correction data of the vehicle type is read from the storage unit each time it is displayed, and
transferred to the correction circuit. (Steps 5 and 6) In this state, the setting of the correction
data is not determined data, but determined by an operation after the next step. The reason why
the correction data is not determined at this time is to select whether or not to perform the
manual adjustment in step 7 and to add the adjustment data to the correction data for each
vehicle type to make the correction data when performing the manual adjustment.
[0046]
When the type name of the car type to be set is displayed and the car type selection button is
pressed again for 2 seconds or more, the contents of the correction data of the displayed sound
field characteristics are determined and stored in the storage unit. (ステップS10,S11、
S12)
[0047]
In step 7, when it is desired to manually adjust the sound field characteristics of the vehicle type
to be installed, the correction data set in the sound quality adjustment circuit can be reset. For
example, when the type name of the vehicle type is displayed, a low band correction button or an
high frequency part of the voice, which is an operation button for changing the characteristics of
the low frequency part of the voice provided in the manual setting unit 16 The high-frequency
correction button, which is an operation button for changing the characteristics, is operated to
change the frequency characteristics of the sound to be reproduced. The data of the correction of
the sound quality adjustment circuit is rewritten each time the above setting is performed.
[0048]
When the above setting is completed and the vehicle type selection button is pressed for 2
seconds or more in step 9, the setting of the adjustment data adjusted by the manual unit is
confirmed by canceling the vehicle type selection mode, and the adjustment data is
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simultaneously stored in the storage unit. After the manual adjustment setting, the adjustment
data stored each time the reproducing apparatus is activated is read from the storage unit, and
the sound field echo characteristic set by the read data can be maintained.
[0049]
Further, since the vehicle type or the result of manual adjustment set on the display device is
displayed for a certain period of time after the playback device is started, it is possible to easily
confirm whether the setting has been made properly.
[0050]
Although the foregoing has described about obtaining substantially the same sound field
characteristics regardless of the vehicle type, it is also possible to provide different sound field
characteristics for each vehicle type for the purpose of setting the sound field characteristics
according to the atmosphere of the vehicle type.
[0051]
Further, the present invention is not limited to the in-vehicle audio reproduction apparatus, and
can be applied to the interior of a general house where audio signals are likely to be reflected, for
example, in the same manner as the vehicle interior.
[0052]
As described above, according to the present invention, by storing sound field correction data for
each type of car in the storage unit, sound field correction appropriate for the type of car can be
easily set.
Further, even when the user of the car changes the type of the in-vehicle reproducing apparatus
of the present invention and installs it on another car, it is possible to easily set appropriate
sound field characteristics.
[0053]
Also, by setting the correction of the sound field characteristic of the vehicle type to output
different levels of sound pressure to the output of the front and rear speakers or changing the
phase of the output of the front and rear speakers and outputting the sound in the passenger
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compartment It is possible to easily correct the deterioration of the acoustic characteristics due
to the reflection and the installation position of the speaker, and to reduce the difference in the
sound quality depending on the vehicle type.
[0054]
Further, by storing the adjustment data that has been manually adjusted in the storage circuit,
the operation of manual adjustment that adjusts the sound field characteristic each time the
power is turned on can be eliminated, and the in-vehicle reproducing apparatus having excellent
operability can be obtained.
[0055]
In addition, to display the adjustment contents of the selected vehicle type and sound field
characteristics for a certain period of time from the time the power is turned on, music with the
wrong sound field characteristics without noticing that the vehicle type selection mistake or
incorrect adjustment is made There is no such thing as listening to
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