JPS60193781U - Automotive sound field correction device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 A is the sound pressure frequency characteristic in the front seat of the vehicle interior, B
2 is a configuration diagram showing an example of a reproduction system of an in-vehicle audio device. FIG. 3 is a diagram showing an example of direct waves and reflected waves in a sound field. Figure 5 shows the frequency characteristics of sound pressure at the listening point, Figure 5 shows the spectrum of noise inside a car depending on road conditions and driving speed, and Figure 6 shows a block diagram showing an embodiment of the present invention. 7 is a circuit diagram showing an example of the first high-frequency correction circuit in FIG. 6, FIG. 8A is a characteristic diagram of the energy response of the speaker, and FIG. 8B is a correction frequency characteristic diagram of the circuit in FIG. 7. , FIG. 9 is a frequency characteristic diagram of the driving masking correction circuit in FIG. 6, FIG. 10 is a circuit diagram of an example of the second high frequency correction circuit in FIG. 6, and FIG. 11 is a diagram of each vehicle type A,
A frequency characteristic diagram of the original signal a for each B, the output b of the first high frequency correction circuit, and the output C of the second high frequency correction circuit, FIG. The characteristic diagram, FIG. 13, is the correction circuit 16L corresponding to the number of occupants in FIG. 6.
, 16R is an example circuit diagram, FIG. 14 is a diagram showing the positional relationship between a pair of left and right speakers attached to the front door and a listening point, and FIG. 15 is a circuit diagram of an example of the variable gain device 25L in FIG. 6.
, 25R, FIG. 16 is a circuit diagram of an example in which the first high frequency correction circuit on the front seat side and the correction circuit corresponding to the number of passengers in FIG. 6 are integrated, and FIG. 17 is a circuit diagram showing an example of the rear seat side FIGS. 18 to 20 are circuit diagrams showing a specific configuration of the display means in FIG. 6, and FIG. Figure 22 is a diagram showing the principle of mirror image effect when speakers are placed on the rear parcel tray. Figure 22 is a diagram showing the frequency characteristics in the rear seat when speakers are placed on the rear parcel tray. Figure 23 is a low frequency cut. Fig. 24 is a diagram showing the standing wave distribution in the vehicle interior when no cutting is performed, Fig. 24 is a diagram showing its frequency characteristics, Fig. 25 is a diagram showing the frequency characteristics of the power amplifier on the rear seat side, and Fig. 26 is a diagram showing the frequency characteristics of the power amplifier on the rear seat side. Fig. 27 is a diagram showing the distribution of standing waves in the vehicle interior, Fig. 28 is a diagram showing the frequency characteristics of each power amplifier for rear seat side A, front seat side B, and bass C, Fig. 29 The figure is a diagram showing the mounting position of the speaker in the vehicle interior. Explanation of symbols of main parts, 10...First high frequency correction circuit, 11...Travel masking correction circuit, 1
2...Front seat speaker correction circuit, 13...
...Rear seat speaker correction circuit, 15L, 15R
...Second high frequency correction circuit, 16L, 16R...
... Correction circuit corresponding to the number of passengers, 17L, 17R ...
...Peak dip correction circuit, 23L, 23R, 25
L, 25R...Variable gain unit, 30...
Input means, 31...Display means. "dβ11 ■---- 100 7 to 0° (11rl:) 10K Ji 1 mi 8 poor 1 ivy: ()-1zl43F
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Claims (2)

[Scope of utility model registration request] (1) An in-vehicle sound field that corrects the acoustic characteristics in the vehicle interior sound field created by direct waves and their reflected waves from front and rear speakers installed in pairs on the left and right, corresponding to the front and rear seats of the vehicle. a correction device, an input means for inputting seating conditions in each of the front seat and the rear seat;
In accordance with the input information from the input means, when there are multiple occupants in the front seat, the output level of the pair of front speakers is set to be approximately the same, and when there is only one occupant, the output level of the pair of front speakers is set to be approximately the same, and when there is only one occupant, the output level of the pair of front speakers is set to be approximately the same. The first to increase the output level of
and a correcting means for making the output level of the pair of rear speakers the same when there are a plurality of occupants in the rear seat according to the input information by the input means, and for the seat where the occupant is seated when there is only one occupant. A vehicle-mounted sound field correction device comprising a second correction means for attenuating the output level of a nearby speaker. (2) The vehicle-mounted sound field correction device according to claim 1, wherein the rear speaker is installed on a parcel tray.