JP2601419Y2 - Car stereo - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car stereo, and more particularly, to a car stereo that performs sound field control optimal for a vehicle type.

[0002]

2. Description of the Related Art In a conventional car stereo, sound from a sound source such as an FM radio or a CD player is reproduced from a speaker. For example, in a CD player device, a CD
After a read signal read from a CD (compact disc) set in the player is converted into a digital signal, the digital signal processing unit (DSP) performs predetermined digital signal processing, converts the signal again into an analog signal, and outputs the analog signal from the speaker. .

[0003]

As described above, in a conventional car stereo, a predetermined signal processing is performed on a sound signal from a sound source to reproduce sound from a speaker. However, there are a wide variety of cars equipped with car stereos, and the conditions such as the interior space, interior materials, and seating arrangements of cars to which the car stereos are attached are different, so it is necessary to reproduce the optimal sound field for each condition. Is impossible. Conventionally, it is not optimal for all types of vehicles, regardless of the setting of such optimal conditions, but it only considers the setting of the speaker position to reproduce a preferable sound field, etc. It cannot meet the demands of the user who wants to reproduce the sound field in a proper manner. To meet this demand, DSP
In order to change the contents of the processing, the parameters such as the filter coefficient and the delay time may be changed. However, the change of these parameters requires a complicated circuit configuration and causes a cost problem.

[0004] Therefore, an object of the present invention is to provide a car stereo capable of reproducing a sound field that is optimal for a vehicle interior such as a vehicle type.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a car stereo according to the present invention is optimized for a car stereo that reproduces a sound field by performing predetermined signal processing on a reproduced music signal to generate sound. Reading means for reading the vehicle type correction data from a CD / ROM in which vehicle type correction data of a predetermined vehicle type necessary for reproducing a sound field is recorded; and a vehicle read by the reading means. A display unit for displaying vehicle type information corresponding to the vehicle type included in the type correction data, a selection unit for selecting an arbitrary vehicle type from the vehicle types displayed on the display unit, and a selection unit selected by the selection unit. And control means for controlling the signal processing with the correction based on the vehicle type correction data corresponding to the vehicle type.

[0006]

In the present invention, correction data necessary for reproducing an optimal sound field for each vehicle type is stored in a CD / ROM, and the correction data is stored in a CD / ROM.
By performing signal processing on music data based on the correction data read from the ROM, it is possible to reproduce a sound field optimal for each vehicle model with a simple configuration.

[0007]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of a car stereo according to the present invention. The CD player 1 houses a CD / ROM 11A or a music CD 11B, and the stored contents are reproduced. The reproduced data is
By passing through the determination circuit 15, it is determined whether the data is correction data or music data. The CD / ROM 11A stores, for example, correction data necessary for reproducing an optimal sound field for each type of vehicle, that is, for each type of vehicle space arrangement, seat position, and the like. The correction data is, for example, correction data for reference data set as optimal data in the sedan.
The models include "sedans", "hardtops", "hatchbacks", "coupe", "vans", and the like.

The system microcomputer 26 receives the vehicle type data corresponding to the correction data transmitted via the system microcomputer 12, the driver 14, and the driver 28, and the vehicle type data is displayed on the display 27. A vehicle type to be selected is set by operating the selector switch 29 from the vehicle type data displayed on the display 27.

The system microcomputer 12 is provided with the discrimination circuit 1
5 and performs predetermined signal processing upon receiving the music data from the music CD 11B.
If the data is correction data, the data is sent to the driver 14. A digital signal processing unit (DSP) 22 of the digital signal processing device (DSP device) 2 receives digital music data from the A / D converter 13 and performs predetermined digital signal processing. The correction data from the driver 14 of the CD player 1 is stored in the external empty memory (EX-RAM) 24B via the driver 28 of the DSP device 2 and is always stored under the control of the DSP control unit 25. The EX-RAM) 24A is linked with the correction data stored in the external empty memory (EX-RAM) 24B, and the linked data is stored in the external empty memory (EX-RAM) 24B again. The DSP 22
Under the control of the DSP control unit 25 based on the correction data stored in the external empty memory 24B, the digital signal processing optimal for the vehicle type corresponding to the correction data is performed.

The system microcomputer 26 controls the overall operation of the DSP device 2, and displays the operating state and the type of vehicle corresponding to the currently selected correction data on the display 27.
To be displayed. The digital music data digitally processed by the DSP 22 is converted into an analog signal by the D / A converter 23, amplified by the amplifier 3, and output to a speaker or the like as a music signal. Reset switch 2
1 is D when setting correction data for another vehicle type.
This is for resetting related circuit units in the SP device 2.

The correction data recorded on the CD / ROM 11A includes, for example, the following data. In this embodiment, the CD / ROM 11A is divided into a plurality of selectors in the same manner as the music CD 11, and each divided selector It records vehicle-specific correction data. (A) Correction data of direct sound by vehicle type (b) Correction data of initial reflected sound by vehicle type (c) Correction data of reverberation sound by vehicle type (d) Correction data of asymmetrical listener position with respect to speaker by vehicle type ( e) Correction data of sound image fixed position by vehicle type (f) Correction data of delay time for L / R speaker of vehicle type (g) Correction data of transmission characteristic peculiar to vehicle interior

FIG. 2 is a block diagram showing another embodiment of the car stereo according to the present invention. In FIG.
The components denoted by the same reference numerals as those in FIG. 1 are components having the same functions. In this embodiment, a CD / ROM and a music CD can coexist by utilizing the function of a CD autochanger and without entering / leaving a CD / ROM as in the embodiment of FIG. Further, by applying this embodiment, it is possible to store various types of correction data, and the expandability is improved.

[0013]

[Effect of the Invention] As described above, the car stereo according to the invention stores correction data necessary for reproducing an optimum sound field for each vehicle type in a CD / ROM, and a CD / R.
Since the music data is signal-processed based on the correction data read from the OM, an optimal sound field for each vehicle type can be reproduced with a simple configuration. In addition, since it is only necessary to add a CD / ROM and perform the correction processing in the DSP device section, it is possible to set appropriate optimum conditions for a mass-produced vehicle.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a car stereo according to the present invention.

FIG. 2 is a structural block diagram showing another embodiment of the car stereo according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 CD player 2 Digital signal processor (DSP) 3 Amplifier 11A C
D / ROM 11B Music CD 12, 26 System microcomputer 13 A / D converter 14, 16, 17, 28 Driver 15 CD / ROM, music CD discriminating circuit 18 Decoder 21 Reset switch 22 Digital signal processing unit (DSP) 23 D / A converter 24A External memory 24B External empty memory 25 DSP control unit 27 Display 29 Selector switch

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Sato 2-17-5 Shibuya, Shibuya-ku, Tokyo Co., Ltd. Kenwood Co., Ltd. (56) References JP-U 2-112100 (JP, U) JP-U 4 -61995 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B60R 11/02

Claims (2)

(57) [Scope of request for utility model registration] 1. A car stereo which reproduces a sound field by generating a voice by performing a predetermined signal processing on a reproduced music signal, wherein a predetermined vehicle type required for reproducing an optimum sound field is provided. Reading means for reading the vehicle type correction data from the CD / ROM in which the correction data is recorded; and display means for displaying vehicle type information corresponding to the vehicle type included in the vehicle type correction data read by the reading means. Selecting means for selecting an arbitrary vehicle type from among the vehicle types displayed on the display means; and performing the signal processing with correction based on vehicle type correction data corresponding to the vehicle type selected by the selecting means. And control means for controlling the car stereo. 2. A CD autochanger, wherein the CD / R
The car stereo according to claim 1, wherein the OM and the music CD coexist.