JPH08163688A - On-vehicle sound field correction device - Google Patents

Abstract

PURPOSE: To provide a sound field correction device for on-vehicle audio equipment capable of giving the optimum sound field to every kind of vehicle specification and the mounting position of a loudspeaker though with memory small in capacity. CONSTITUTION: A front loudspeaker selection switch 22 and a rear loudspeaker selection switch 23 are provided, and a microcomputer 20 reads out correction data stored in memory 21 in advance at every switching of a switch, respectively, and operates a DSP 2. The DSP 2 processes audio data inputted via an A/D converter 1 based on the correction data, and outputs a result from D/A converters 3, 4 and moreover, from a front side loudspeaker and a rear side loudspeaker via amplifiers 5, 6. The correction data for the front part side and that for the rear part side of a vehicle are separated and stored individually in unit of plural pieces of data, thereby, the kinds settable as correction values can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field correction device for an on-vehicle audio equipment. More specifically, the shape of the vehicle interior space,
The present invention relates to a sound field correction device that enables correction according to size and the like.

[0002]

2. Description of the Related Art Acoustic characteristics in a vehicle compartment differ depending on the vehicle type. That is, since the standing wave is generated in the audible frequency band due to the shape and size of the vehicle interior space, especially the spatial narrowness of the vehicle interior, the sound emitted from the speaker installed in the vehicle interior is not affected by it. , In some cases, the equalized sound device may not be transmitted to the listener as desired. FIG. 2 is a diagram showing an example of transmission characteristics in the passenger compartment. For the above reason, the audible frequency emitted from the audio device with a flat characteristic has a characteristic with a peak dip at the listener position as shown in the figure, and is transmitted to the listener in a state where the sound quality is deteriorated.

In order to correct the above-mentioned deterioration of sound quality, an equalizer is attached to the audio equipment so that the optimum sound quality can be adjusted at the listener's position, and the listener adjusts the equalizer to adjust the audio signal from the audio equipment. After changing the f characteristic, a method of reproducing from a speaker is used. FIG. 3 shows an example of such a device, in which the left and right audio signals L and R are adjusted by their equalizers and then reproduced from a speaker via respective amplifiers.

In such a device, the listener must equalize the optimum f characteristic according to the vehicle type, but the adjustment is not only surprisingly difficult and complicated, but also
The listener often cannot determine if the adjustments truly match the desired characteristics of the music source. Therefore, a method has been considered in which a desired f characteristic is obtained according to the vehicle type at the stage of mounting the audio equipment.

For example, Japanese Patent Laid-Open No. 60-189396 discloses a device capable of correcting a sound field for each vehicle type. In the above device, the equalizer circuit that corrects the sound field is divided into a main body portion and a correction unit portion that determines the equalizer characteristic, and the main body portion has a common specification for each vehicle type, while the correction unit portion has a sound transmission characteristic for each vehicle type. By preparing multiple types of compatible characteristics and connecting the correction unit of the required characteristics according to the vehicle type to the main body part in a detachable manner, the sound field suitable for each vehicle type can be heard without adjustment. To do.

Apart from this, in recent years, with the advent of DSPs (digital signal processors) and the like, it has become possible to perform sound quality processing with digital signals. In some cases, a method of storing the data as the correction value for each of the above in the memory and selecting the correction value from the memory to perform the sound field correction as desired.

FIG. 4 shows an example of the case where the DSP-processed correction signal is output to the speakers installed in the front and rear of the passenger compartment. As shown in the figure, the 1 or 2 channel audio signal is digitally converted by the A / D converter 1 and then D
An analog signal is output from the D / A converters 3 and 4 via the SP2 and is output to the front speaker and the rear speaker via the respective amplifiers 5 and 6. Meanwhile D
There is a microcomputer 10 for operating the SP, and the microcomputer 1 is activated by the signal selected by the vehicle type selection switch 9 for each vehicle type.
0 operates to read the correction value for each vehicle type from the memory 11 and operate the DSP. As a result, by operating the vehicle type selection switch 9 in accordance with the vehicle type, a desired f suitable for the vehicle type is obtained.
The characteristics are obtained.

According to the above method, the speaker is mounted on the memory in consideration of the memory capacity on the assumption that the speaker is placed at a certain position, for example, on the lower side of the door on the front side and on the rear parcel section on the rear side. It is a memorized one. However, even if the same vehicle model is set by changing the above positions, the same audio device may be installed in another vehicle model. Therefore, if the mounting position of the speaker is changed to the above-mentioned assumed position, not only the correction cannot be performed properly, but also the deterioration may be caused. In addition, even if the speaker mounting position is different even in the same car model, the acoustic characteristics are affected, so to solve this, set multiple correction values according to the speaker mounting position in the same car model.
You must keep your husband and wife in memory. That is, a correction value must be set according to each speaker mounting position, and a large amount of data is required even for the same vehicle type. Further, when the same audio equipment is installed in another vehicle type, a large capacity storage device is required.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is suitable for various vehicle types and speaker mounting positions while having a small storage capacity. An object of the present invention is to provide a sound field correction device for an in-vehicle audio device that provides a sound field.

[0010]

A vehicle-mounted sound field correction apparatus according to the present invention is a vehicle-mounted sound field correction apparatus for correcting a vehicle compartment to have a predetermined sound field characteristic. And a selection unit for independently reading the correction data on the front side and the correction data on the rear side of the storage unit. The purpose is to

[0011]

The sound field correction apparatus for an on-vehicle audio equipment according to the present invention separately stores the correction data on the front side and the correction data on the rear side in the vehicle compartment, and stores them individually for each of a plurality of husbands and then independently. By reading it out, it is possible to provide an optimum sound field for various vehicle types and speaker mounting positions with a small storage capacity.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the sound field correction apparatus of the present invention, which is contrasted with FIG. The same description as the conventional example is omitted.

In FIG. 1, 20 is a microcomputer, and 2
Reference numeral 1 is a memory that constitutes a storage means for individually storing a plurality of correction data for the front side and a plurality of correction data for the rear side inside the vehicle compartment. Reference numeral 22 is a selection switch for the front speaker, and 23 is a selection switch for the rear speaker. The husband has a selection means for independently reading the correction data on the front side and the correction data on the rear side of the storage means. I am configuring.

In the present invention, the front speaker selection switch 2 is used instead of the vehicle type selection switch shown in the conventional example.
2. Microcomputer 2 with rear speaker selection switch 23
0 is the memory 2 in advance each time the switch of the husband and the husband is switched.
The correction data stored in 1 is read out and the DSP 2 operates. The DSP processes the audio data input via the A / D converter 1 based on the data and outputs the D / D data.
The signals are output from the front side speaker and the rear side speaker via the A converters 3 and 4, and the amplifiers 5 and 6.

The correction data is obtained by mounting the speakers of various caliber which can be mounted at the respective expected mounting positions in the passenger compartments of various vehicle types, and measuring the correction separately for the front speaker correction and the rear speaker correction. A memory storage setting value is determined based on the data and stored separately in the memory. For example, various vehicle types such as sedans, station wagons, 1BOX, and light passenger cars are selected as vehicle types.
In addition, the door is mainly selected as a mounting position for the front speaker, but various mounting positions such as a parcel, a door, a straddle, and a board are selected for the rear speaker according to the vehicle type, and the speaker has a diameter of 6.5. Various types of speakers that are expected to be installed are selected, such as inch 1-way, 2-way, 4-inch type and elliptical type speakers.

In the above, for example, if a sedan is selected as the vehicle type, 1-way and 2-way are selected as the front speakers attached to the door, and parcels and doors are selected as the rear speaker mounting positions, and respective correction measurement data are stored in the memory. Two types of front speaker correction data and two types of rear speaker correction data are obtained. By freely combining these with the front speaker selection switch 22 and the rear speaker selection switch 23, a correction value composed of a combination of four types of correction data can be obtained.

This means that the stored data need only be 1/2 as compared with the case where the front side data and the rear side data are held together. In other words, in this case, if the storage amount is the same, the type that can be set as the correction value can be doubled as compared with the conventional device.

In the above case, the vehicle type having the front speaker and the rear speaker is described, but in the vehicle type having no front speaker, only the rear speaker selection switch 23 corresponding to the rear speaker may be selected.

Although the case of the DSP is shown in the above embodiment, an equalizer may be used instead of the DSP.

[0020]

As described above, according to the configuration of the present invention, the transmission characteristics can be easily corrected according to various vehicle types and speaker mounting positions, so that it is suitable regardless of the shape and size of the vehicle interior. It can be heard by its acoustic characteristics.

In addition, the sound field correction apparatus for a vehicle-mounted audio device according to the present invention separately stores the correction data on the front side and the correction data on the rear side in the vehicle compartment, and stores the plural data individually for each of the two. The number of types that can be set as the correction value can be increased to provide suitable acoustic characteristics, which is highly economical.

[Brief description of drawings]

FIG. 1 is a diagram of an embodiment of a sound field correction apparatus of the present invention.

FIG. 2 is a diagram showing an example of transmission characteristics in a vehicle interior.

FIG. 3 is a diagram of a conventional vehicle-mounted equalizer.

FIG. 4 is a diagram of a conventional vehicle-mounted sound field correction device.

[Explanation of symbols]

 2 DSP2 20 Microcomputer 21 Memory 22 Front speaker selection switch 23 Rear speaker selection switch

Claims (1)

[Claims] 1. A vehicle-mounted sound field correction device for correcting a vehicle interior to have a predetermined sound field characteristic, wherein a plurality of storages are separately stored for each of front side correction data and rear side correction data in the vehicle interior. Means and a selection means for independently reading the correction data on the front side and the correction data on the rear side of the storage means.