JPH11289593A - On-vehicle voice reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle voice reproducing device with which the phases of audio signals can be matched at a hearing position in a simple configuration and the quality of reproduced sounds in a car is prevented from being degraded. SOLUTION: Correction data for correcting the characteristics of a correction circuit 9 for a front speaker 13 and of a correction circuit 10 for a rear speaker 14 are stored in a storage part 7 as one set, and the correction data designated by a car type selecting means 15 are read out of the storage part 7 and controlled so as to set the characteristics of the correction circuits 9 and 10. Corresponding to the correction data stored in the storage part 7, a change in the phase of an audio signal caused by reflection of the audio signal on front and rear glass panes inside the car is corrected while changing the ratio of levels of audio signals outputted from the front and rear speakers.

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 for reproducing sound in an optimum sound field even in a vehicle room having different sound field characteristics.

[0002]

2. Description of the Related Art The sound field characteristics in a vehicle compartment vary greatly in size and shape of the vehicle compartment depending on the type of vehicle. For this reason, when installing an in-vehicle audio reproduction device in a vehicle cabin,
It is necessary to correct the difference in the sound field characteristics in the passenger compartment. Conventionally, sound field characteristics are corrected by operating a sound field adjustment knob provided on an operation panel of an in-vehicle audio reproducing device while a user listens to a sample so that a sound field suitable for a vehicle compartment is reproduced. Had been decided.

[0003] As a correction method for performing sound field adjustment, for example, an audio band is divided into a plurality of frequency bands like a graphic equalizer, and a frequency characteristic correction is performed so that an audio reproduction level can be varied for each divided frequency band. There is something for the purpose.

Further, a method of storing correction data having different frequency characteristics for each vehicle type in a storage circuit, reading out the corresponding correction data from the storage circuit in accordance with the vehicle type to be installed, and changing the frequency characteristics of the reproduction circuit can be easily considered. Technology.
In this case, a digital signal processing circuit such as a tone control circuit or a DSP composed of analog elements can be used as the reproduction circuit.

FIG. 4 is a diagram showing the overall configuration of a conventional on-vehicle audio reproducing apparatus. In FIG. 4, correction data for each vehicle type is stored in a storage unit 7, the control unit 6 reads out the correction data, and is transferred to a correction circuit unit 9 via an interface unit 8. The transferred correction data 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 amplification circuit unit 11, drives the front speaker 13 and the rear speaker 14, and
Played as audio. The vehicle type selection unit 15 has operation buttons for selecting and specifying a vehicle type. Input selector 17
Has operation buttons for switching among a tuner 2, a CD / MD player 3, a tape deck 4, and an external input terminal 5, which are audio reproducing devices. Further, the control unit 6 controls the input switching unit 1 to perform connection with the instructed audio reproducing device.

In the configuration of the above-described conventional example, although the characteristics of the sound field can be easily changed by using the correction data stored in the storage section 7, the reflection of the reproduced signal in the vehicle compartment of the selected vehicle type is performed. Cannot be easily corrected.

As a prior art for correcting the sound field characteristics in a vehicle cabin, Japanese Patent Application Laid-Open No. Sho 60-189396 (Voice correction device for vehicle) is disclosed. According to the invention,
It describes that a correction unit having a frequency characteristic that matches a sound field characteristic in a vehicle room to be installed is selected and installed in a main body of the audio reproducing device in advance, and the audio reproducing device is installed in the vehicle interior.

[0008]

However, in the correction method of the prior art involving manual adjustment operation, the means for setting the correction value according to the vehicle compartment relies on the user's audition, so that an appropriate correction can be made. In some cases, the setting operation of the correction value is terminated without being performed, so that the sound field may not be used in an optimal sound field characteristic state.

Further, if a correction unit predetermined for a vehicle type described in Japanese Patent Application Laid-Open No. 60-189396 is incorporated in a device, it is possible for a user to install the device in a different vehicle type. There has been a problem that sound cannot be reproduced with various sound field characteristics.

In the above-described prior art, a method of storing correction data preset for each vehicle type in a storage circuit, and then selecting a vehicle type and reading out the correction data from the storage circuit to correct the data, will be described. Although the problem can be improved, only insufficient sound field characteristics are obtained in the following points.

As one of them, audio signals output from the front speaker and the rear speaker are output from a correction circuit set using the same correction data. When the audio signal from the front speaker reflected on the rear glass surface is synthesized in the cabin space, the audio signal is out of phase compared to the direct audio signal from the rear speaker. I do. As a result, there is a problem that the sound quality of the audio signal in the vehicle interior is deteriorated.

Further, in the prior art, when a manual setting for manually adjusting to change the sound field characteristics is performed, and then a vehicle different from the setting is selected and reproduced, the manual setting before changing the vehicle type is performed. Since the data thus set remains valid, the sound field characteristics greatly deviate from the original, and it is necessary to redo the manual setting or cancel the data of the manual setting. Similarly, when the power is turned off and the power is turned on again for playback, the data of the manual setting is lost, and the manual setting has to be performed again.

The present invention has been made in view of the above,
It is an object of the present invention to provide an on-vehicle audio reproducing apparatus that adjusts the phase of an audio signal at a listening position with a simple configuration and prevents the sound quality of reproduced sound in a vehicle cabin from deteriorating.

[0014]

SUMMARY OF THE INVENTION The present invention relates to an on-vehicle audio reproducing apparatus having a sound field correcting section for correcting a sound field characteristic in a vehicle compartment to a predetermined characteristic. And a correction circuit unit for the rear speaker, and sets correction data for setting characteristics of the correction circuit for the front speaker and the correction circuit for the rear speaker as a set, and corrects correction data for a plurality of vehicle types. Storage means for storing in the storage unit;
Control means for reading the correction data specified by the selection means for selecting a vehicle type from the storage unit and controlling the characteristics of the correction circuit to be set.

According to the present invention, there is provided an on-vehicle audio reproducing apparatus having a sound field correcting section for correcting a sound field characteristic in a vehicle compartment to a predetermined characteristic. This is an on-vehicle audio reproducing apparatus having a phase correction circuit section or a delay circuit section in a circuit section.

Further, according to the present invention, in a vehicle-mounted audio reproducing apparatus having a sound field correcting section for correcting a sound field characteristic in a vehicle compartment to a predetermined characteristic, the correction data of a plurality of vehicle types stored in the storage section is This is an in-vehicle audio reproducing device that is data in which the phase and level of the audio signal at the listening position are substantially the same regardless of the vehicle type.

Further, according to the present invention, in a vehicle-mounted audio reproducing apparatus having a sound field correction unit for correcting a sound field characteristic in a vehicle compartment to a predetermined characteristic, the correction data of a plurality of vehicle types stored in the storage unit is: This is an in-vehicle audio reproducing device that is data in which the phase and level of an audio signal at a listening position are different for each vehicle type.

Further, according to the present invention, in a vehicle-mounted audio reproducing apparatus having a sound field correction section for correcting a sound field characteristic in a vehicle compartment to a predetermined characteristic, the control section includes correction data of a selected vehicle type. To control the characteristics of the correction circuit.

Further, according to the present invention, in a vehicle-mounted audio reproducing apparatus having a sound field correcting unit for correcting a sound field characteristic in a vehicle compartment to a predetermined characteristic, the storage unit differs in correction data for vehicle type and adjustment data. This is an on-vehicle audio reproducing apparatus having an adjusting unit that is stored in an area and arbitrarily changes adjustment data.

According to the present invention, there is provided an on-vehicle audio reproducing apparatus having a sound field correcting section for correcting a sound field characteristic in a vehicle cabin to a predetermined characteristic. This is an on-vehicle audio reproducing device having a display means for displaying a vehicle type or adjusted contents.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below to solve the above-mentioned problems of the prior art. FIG. 1 is an overall configuration diagram showing one embodiment of the present invention. In FIG. 1, a correction circuit section 9 is a correction circuit for an audio signal output from the front speaker 13, and a correction circuit section 10 is a correction circuit for an audio signal output from the rear speaker 14. The correction data for each vehicle type is stored in the storage unit 7, and the control unit 6 reads out 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 constant for setting sound field characteristics of the correction circuit units 9 and 10. The audio signals corrected by the correction circuit units 9 and 10 are amplified by the amplifier circuit units 11 and 12 and drive the front speaker 13 and the rear speaker 14 to be reproduced as sound.

The vehicle type selecting section 15 has operation buttons for selecting and specifying a vehicle type. The input selection unit 17 has operation buttons for instructing switching of the tuner 2, the CD / MD player 3, the tape deck 4, and the external input terminal 5, which are audio reproduction devices. The display unit 18 is a display for displaying a mode setting state and a reproduction state of the recording and reproducing apparatus. The control unit 6 controls the input switching unit 1 to connect to the audio reproducing device selected by the input selection unit 17.

The control unit 6 reads out the front speaker correction data and the rear speaker correction data stored in the storage unit 7 as a set from the storage unit 7 and transfers the correction data to the interface unit 8. Correction circuit units 9 and 10
Set the characteristics of

The control unit 6 includes a manual setting unit 16
Is generated as adjustment data and stored in the storage unit 7. When the correction data is read from the storage unit, the correction data and the adjustment data are added and transferred to the interface unit 8.

The correction data is supplied to the correction circuits 9 and 10 shown in FIG.
Each of the adjustment circuit units 100, 101,
102, 200, 201, and 202, and the contents of the correction data are gain data in a low frequency region in a voice band, gain data in a wide frequency region, gain data in all frequency bands, and a delay circuit. 103 is delay data.

As an example of a signal output by operating the operation knob provided in the manual setting section 16, although not shown, when the manual setting section outputs a digital signal using a rotary encoder or the like, The control unit 6 recognizes digital data output in accordance with the rotational position or the number of rotations of the rotary encoder as a setting change signal of the adjustment data, and converts the signal into a predetermined data format by recognizing the setting change signal. Store in the storage unit.

When outputting an analog signal using a volume or the like, the analog signal is converted into a digital signal using an analog-to-digital converter, and then converted into a predetermined data format by the control unit 6 and stored in the storage unit. To memorize. 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.

In FIG. 1, when one of the vehicle types such as sedan, wagon, and sports is selected as the type name of the vehicle type set by the vehicle type selecting unit 15 of the panel operation unit 19, the control unit 6 selects the type. The correction data for each vehicle type is read out from the storage unit 7 and gain adjustment circuit units 100 and 200 for the low frequency part and gain adjustment circuit parts 101 and 201 for the wide frequency part of the correction circuit parts 9 and 10 via the interface unit 8. The characteristics of the volume control circuit units 102 and 202 and the delay circuit 103 are set respectively. Registers 104 and 204 for storing correction data are provided in each circuit section.
And the characteristics of each circuit are determined by the stored correction data. Here, the front speaker 13 and the rear speaker 1
Although the correction data of No. 4 is set as different data, the data may be the same depending on the vehicle type.

Next, in this embodiment, a manual setting section 16 for manually adjusting the correction data according to the listener's preference is provided in addition to the setting of the sound field characteristics by the vehicle type selection button. The data manually adjusted by the manual setting unit 16 is stored in the storage unit via the control unit 6 as adjustment data attached to the vehicle-specific correction data separately from the vehicle-specific correction data in the storage unit 7.

The correction data and the adjustment data are respectively stored in different areas of the storage unit. After these are read out from the storage unit, the correction data and the adjustment data are added by the control unit, and stored in the registers. Is stored.

When the power of the audio reproducing apparatus is turned on, data obtained by adding the correction data read from the storage section and the adjustment data is transferred to the correction circuit section, corrected based on the transferred data, and reproduced. The audio signal output from the device is reproduced as audio.

The display unit 18 displays the vehicle type selected by the vehicle type selection unit 15, and although not shown, the vehicle type can be easily determined by pressing a vehicle type selection confirmation button.

The type name of the determined vehicle type is displayed for a certain time when the power of the apparatus is turned on, so that the vehicle type set by the operator can be confirmed. Further, by simultaneously displaying the contents of the manual adjustment, it is possible to confirm whether the desired sound quality is obtained.

FIG. 2 shows the intensity H of the sound signal of the reflected sound when the sound signal from the front speaker is reflected on the rear glass surface.
1 and the intensity B1 of the audio signal generated from the rear speaker
FIG. 7 is a diagram illustrating a relationship between the audio signal and a spatially synthesized audio signal at a listening position P. FIG. 2A 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, the sound intensity B1 directly from the rear speaker and
Depending on the sound intensity H1 of the reflected sound from the rear glass surface, B
A phase shift of θ occurs with respect to 1 and an audio signal indicated by P1 is obtained. B1, H1, P1, and A1 are represented by vectors having magnitude and phase, respectively. Here, A1 is a vector representing an audio signal at a listening position of the audio signal output from the front speaker. Here, the audio signal P1 at point P
Is represented by the following equation. P1 (P1, θ) = | B1 | · Sin (ωt) + | H1 | · Si
n (ωt + θ1)

FIG. 2B shows the relationship between the level and the phase of the audio signal in the case of the second vehicle type. Reflected signal level | H2 | of the audio signal from the front speaker reflected from the rear glass surface with respect to the audio signal B1 from the rear speaker
(| H2 |> | H1 | in the figure), the phase shift of the audio signal due to the effect of the reflected sound at the listening position P is θ ′. The audio signal at the point P at this time is It is represented by P2 (P2, θ ') = | B1 | · Sin (ωt) + | H2 | ·
Sin (ωt + θ1) Here, θ ′> θ, and the phase shift changes more greatly.

Next, as shown in FIG. 2C, in the second vehicle type, the audio signal level | B1 | of the rear speaker is increased to | B2 |
Can be made the same as that of the first vehicle type by the phase shift θ due to the influence of the reflected sound. The sound signal level at point P at this time is expressed by the following equation. P3 (P3, θ) = | B2 | · Sin (ωt) + | H2 | · S
The phase shift θ of in (ωt + θ1) P1 is output after the sound signal output from the front speaker is corrected in advance by a delay circuit incorporated in a correction circuit for the front speaker, and is output as shown in FIG. As shown in a), the audio signal A1 output from the front speaker and the audio signal P1 obtained by combining the audio signal output from the rear speaker and the reflected signal of the reflected sound have the same phase. .

Next, in order to make the audio signal of P3 shown in FIG. 2C the same size as that of FIG. 2A, | A1 |
| B2 | may be changed at the same ratio. The audio signal at the listening point P at this time is expressed by the following equation. P1 ′ (P1 ′, θ) = | B2 ′ | · Sin (ωt) + | H2 ′
| · Sin (ωt + θ1) P1 '= P1

As described above, the correction of the sound field characteristics is separately performed for the front speaker and the rear speaker, and the output from the front speaker uses the phase correction circuit or the delay circuit. By varying the output level of the output, it is possible to eliminate the phase shift at the listener's position P regardless of the vehicle type, and to prevent deterioration of the acoustic characteristics.

In the above-described embodiment, the characteristic of the phase correction circuit is described as being constant. However, the characteristic may be changed according to the correction data.

As described above, due to the reflection of the audio signal in the vehicle cabin, the phase of the audio signal output from the front speaker and the audio signal from the rear changes at a position where the audio signal is heard. However, by adjusting the gain of the volume control circuit or the phase of the delay circuit so as to make the same, and adjusting the gain of the low frequency part or the gain of the high frequency part, the listening position P point So that the frequency characteristics at are constant.

Further, by using a function that can further add a correction value set in advance according to the vehicle type with data manually adjusted, the sound field characteristics in the vehicle compartment can be adjusted to the taste of the listener. The sound quality can be changed. The manual adjustment data described above is stored in a storage area different from the correction data previously stored in the storage unit 7 in FIG. 1, and the manual adjustment data is updated each time manual adjustment is performed.

Next, the operation will be described with reference to FIG. 3 which is a flowchart showing the operation of the embodiment of the present invention. When the vehicle type selection button provided on the vehicle type selection unit of the panel operation unit is pressed for two seconds or more, the mode is set to the vehicle type setting mode, and a preset type name of the first vehicle type is displayed on the display unit of the panel operation unit.
(Steps S1, S2, S3)

When the type name of the vehicle type is displayed, the correction data of the sound field characteristics of the displayed vehicle type is read from the storage unit.
(Step 4)

Next, the vehicle type selection button is operated again, but as a function different from the above, after pressing the pressing time within 2 seconds, when the vehicle type selection button is rotated, the type name of the second vehicle type is displayed. Further, when the vehicle type selection button is rotated, the third and fourth vehicle types are sequentially displayed. (Steps S9, S10, 13)

Each time the vehicle type correction data is displayed, it is read from the storage unit and transferred to the correction circuit. (Steps 5 and 6) In this state, the setting of the correction data is not the determined data, but is determined by the operation after the next step.
The reason why the correction data is not fixed at this point is that the step 7
This is because whether or not to perform manual adjustment is selected, and when manual adjustment is performed, the adjustment data is added to the correction data for each vehicle type to obtain correction data.

When the vehicle type selection button is pressed again for 2 seconds or more while the type name of the vehicle type to be set is displayed, the contents of the displayed sound field characteristic correction data are determined and stored in the storage unit. (Steps S10, S11, S12)

In step 7, when it is desired to manually adjust the sound field characteristics of the type of vehicle to be installed, the correction data set in the sound quality adjustment circuit can be reset. While the type name of the vehicle type is displayed, for example, a low-frequency correction button, which is an operation button for changing the characteristics of the low-frequency portion of the voice provided in the manual setting section 16, or a high-frequency portion of the voice. A high-frequency correction button, which is an operation button for changing characteristics, is operated to make settings for changing the frequency characteristics of audio to be reproduced. Each time the above setting is performed, the correction data of the sound quality adjustment circuit is rewritten.

After the above setting is completed, the setting of the adjustment data adjusted by the manual unit is determined by pressing the vehicle type selection button for 2 seconds or more in step 9 to cancel the vehicle type selection mode, and the adjustment data is simultaneously stored in the storage unit. . After the manual adjustment setting, the stored adjustment data is read from the storage unit every time the reproducing apparatus is started, and the sound field acoustic characteristics set by the read data can be maintained.

Also, the vehicle type set on the display device or the result of manual adjustment is displayed for a certain period of time from the time when the reproducing apparatus is started, so that it is possible to easily confirm whether the setting has been properly performed. .

The above description has been given of obtaining substantially the same sound field characteristics irrespective of the vehicle type. However, different sound field characteristics can be provided for each vehicle type for the purpose of setting the sound field characteristics according to the atmosphere of the vehicle type. .

The present invention is not limited to an in-vehicle audio reproducing apparatus, and can be applied to, for example, a room in a general house where an audio signal is likely to be reflected, similarly to a vehicle room.

[0052]

As described above, according to the present invention, sound field correction data suitable for a vehicle type can be easily set by storing sound field correction data for each vehicle type in a storage unit.
Further, even when the user of the vehicle changes the type of the in-vehicle reproducing device of the present invention and installs it in another vehicle, appropriate sound field characteristics can be easily set.

The sound field characteristics of each vehicle are corrected by setting the front and rear speakers to output different levels of sound pressure or to change the phases of the front and rear speakers. It is possible to easily correct the deterioration of the acoustic characteristic due to the reflection of the sound in the vehicle interior and the installation position of the speaker, and it is possible to reduce the difference in the sound quality depending on the vehicle type.

Further, by storing the manually adjusted adjustment data in the storage circuit, a manual adjustment operation for adjusting the sound field characteristics every time the power is turned on is eliminated, and an in-vehicle reproducing apparatus excellent in operability is obtained. Can be.

For a certain period of time after the power is turned on, the selected vehicle type and the adjustment contents of the sound field characteristics are displayed.
It is no longer possible to listen to music with the wrong sound field characteristics without noticing that a vehicle model has been selected incorrectly or that a wrong adjustment has been made.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a vector diagram showing a relationship between a level and a phase of an audio signal according to one embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of one embodiment of the present invention.

FIG. 4 is an overall configuration diagram showing a conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input switching part 2 Tuner 3 CD / MD player 4 Tape deck 5 External input terminal 6 Control part 7 Storage part 8 Interface part 9, 10 Correction circuit part 11, 12 Amplification circuit part 13, 14 Speaker 15 Model selection part 16 Manual Setting section 17 Input selection section 18 Display section 19 Panel operation section 100, 200 Low frequency gain control circuit 101, 201 High frequency gain control circuit 102, 202 Volume control circuit 103 Delay circuit 104, 204 Register

Claims (7)

[Claims] An in-vehicle audio reproducing 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 includes a correction circuit unit for a front speaker in the vehicle compartment and a rear speaker. Storage means having a correction circuit section for the first and second correction data for setting the characteristics of the correction circuit for the front speaker and the correction circuit for the rear speaker as a set of correction data for a plurality of vehicle types in a storage section; Control means for reading out the correction data specified by the selection means for selecting a vehicle type from the storage unit and controlling the characteristics of the correction circuit to be set. 2. The on-vehicle audio reproducing apparatus according to claim 1, wherein at least a correction circuit for a front speaker of the correction circuit includes a phase correction circuit or a delay circuit. On-board audio playback device. 3. The on-vehicle audio reproducing apparatus according to claim 1, wherein the correction data of the plurality of vehicle types stored in the storage unit is such that the phase and level of the audio signal at the listening position are substantially independent of the vehicle type. An on-vehicle audio reproducing apparatus, characterized in that the data is the same data. 4. The in-vehicle audio reproducing apparatus according to claim 1, wherein the correction data of the plurality of vehicle types stored in the storage unit is such that the phase and the level of the audio signal at the listening position are different for each vehicle type. An in-vehicle audio reproducing apparatus, characterized in that the data is coded data. 5. The on-vehicle audio reproducing apparatus according to claim 1, wherein the control unit controls the characteristics of the correction circuit by adding adjustment data to correction data of a selected vehicle type. In-vehicle audio playback device. 6. The on-vehicle audio reproducing apparatus according to claim 1, wherein the storage unit has an adjusting unit that stores correction data and adjustment data of a vehicle type in different areas and arbitrarily changes the adjustment data. An in-vehicle audio reproducing device, characterized in that: 7. The on-vehicle audio reproducing apparatus according to claim 1, further comprising display means for displaying a selected vehicle type or adjusted contents for a predetermined time when the power is turned on. An in-vehicle audio reproducing apparatus characterized by the above-mentioned.