JPH03254163A - Sound apparatus for vehicle - Google Patents

Abstract

PURPOSE:To make it possible to reproduce constant position feeling (stereo image) accurately by providing a control means for regulating the output according to a delay time and an attenuation constant. CONSTITUTION:Right and left signals detected through a balance control circuit 11 and front and rear signals detected through a fader control circuit 12 are fed, as control signals, to a delay circuit 13. The delay circuit 13 incorporates a delay circuit for setting the delay time of output signals corresponding to respective speakers FR, FL, RR, RL. The balance control circuit 11 and the fader control circuit 12 incorporate circuits for setting the attenuation constants (volume) of output signals corresponding to the delay time. Output is then regulated according to the delay time set by the delay circuit and the attenuation constant (volume) set by the attenuation constant setting circuit. Consequently, arriving time and volume of reproduced sound are equalized for a listener and constant position feeling (stereo image) is reproduced accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle audio device that is capable of accurately reproducing a sense of localization (stereo image).

(Prior art) Traditionally, audio equipment for automobiles, etc. has been used to control the phase and arrival time of the sound from front, rear, left, and right speakers, and to add reflected and reverberant sounds similar to those at a concert venue. A method that reproduces adhesiveness has been proposed (see Japanese Patent Laid-Open No. 62-216493).

Specifically, the above-mentioned technique is designed to enhance the sound field effect by attenuating the low frequency range of the reverberant signal relative to the high frequency range.

By the way, as shown in FIG. 6, the vehicle 1 is normally provided with a left front speaker PL and a right front speaker PR at the left and right positions of the front seat 2.3, and a left rear speaker PR at the left and right positions of the rear seat 4. A speaker RL and a right rear speaker RR are provided, respectively.

For example, based on the listener (driver) 5 seated on the right front seat 3, the right front speaker PR is at the closest distance Q to the listener 5, and then The distances become farther in the order of speaker FL, right rear speaker RR with distance Q3, and left rear speaker RL with distance 124.

Therefore, as shown in FIG. 7, each speaker FRSF
Since the time t for the reproduced sounds of L, RR, and RL to reach the listener is slightly different, and the sense of localization (stereo image) deteriorates, the left rear speaker RL at the farthest distance Q4
Right ear speaker R at a distance a3 based on the output signal of
The output signal is delayed little by little in the order of the left front speaker PL for distance R, and the right front speaker FR for distance M, so that the time it takes for the reproduced sound from each speaker PR, PL, RR, and RL to reach the listener is equalized. It is conceivable to carry out processing.

(Problem to be Solved by the Invention) However, if the volume (gain) of the reproduced sound of each speaker PR, PL, RR, RL is the same, even if the arrival time of the reproduced sound to the listener 5 is equal, the maximum Close distance 1111
2. The left front speaker FL is at a distance Q, with the volume of the right front speaker FH as a reference.

There was a problem in that the sound volume gradually decreased in the order of the right rear speaker RR at the distance Q3 and the left rear speaker RL at the distance Q4, and the sense of localization (stereo image) deteriorated.

The present invention was made in order to solve the above-mentioned problem, and an object of the present invention is to make it possible to accurately reproduce a sense of localization (stereo image).

(Means for Solving the Problems) Therefore, the present invention provides a vehicle audio system that reproduces an output signal from a signal source using speakers arranged at a plurality of locations in a vehicle interior. The delay time and the attenuation rate of the output signal corresponding to the delay time are set, and a control means is provided for adjusting the output in accordance with the delay time and the attenuation rate.

It is preferable that the delay time and attenuation rate are set in accordance with the distance between the listening position and each speaker.

(Operations and Effects of the Invention) In the present invention, since the delay time and attenuation rate of the output signal are set by the control means in correspondence with a plurality of speakers, the arrival time and volume of the reproduced sound to the listener can be adjusted. becomes equal, making it possible to accurately reproduce the sense of localization.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 1, in-vehicle audio equipment includes a balance control circuit ll that balances left and right signals of the audio signal (output signal) from a signal source 10 such as a cassette deck or CD player, and A fader control circuit 12 that fades a signal, a delay circuit 13, and amplifiers 14a, 14b, 14c, 14
d, and the right front signal, left front signal, right rear signal, and left rear signal amplified by the amplifiers 14a to 1-1d are sent to the speakers PR, PL, RR, and RL.
Each hill is meant to be played.

The right and left signals detected by the balance control circuit 11 and the front signals detected by the fader control circuit 12,
The post signal is input to the delay circuit 13 as a control signal.

The delay circuit 13 includes each speaker FRSFL, RR.
, RL is incorporated.

The balance control circuit 11 and the fader control circuit 12 incorporate an attenuation rate setting circuit that sets the attenuation rate (volume) of the output signal corresponding to the delay time.

Then, the output is adjusted in accordance with the delay time by the delay circuit and the attenuation rate (volume) by the attenuation rate setting circuit.

Specifically, the relationship between delay time and volume as shown in Figure 2 is set for the left and right output signals, and the relationship between the delay time and volume as shown in Figure 3 is set for the front and rear output signals. A relationship between delay time and volume is set.

For example, as shown in FIG. 5(a), if there is a listener (5FR) on the previous seat, each speaker FR.

The distance between PL, RR, and RL is 121<mu<Cs<124
The delay time becomes t, <tl<t3<t
, the volume increases in the order of V l < V t < V
, < V 4, the speaker F
R is the delay time t4. The volume is set to V1, and the speaker P
L is t3. v,, speaker RR is t*V3, speaker R
L is set to,t,V,.

As a result, the arrival time and volume of the reproduced sound to the listener (5F R) are equalized, and the sense of localization (stereo image) is improved.
is accurately reproduced.

Also, if there is a listener (5F1) in the front seat (5th
The same applies to cases where the listener (5RR) is in the rear right seat (Figure 5 (C)), and the listener (5R1) is in the rear left seat (Figure 5 (d)). Can be controlled.

This is summarized in the table below.

(Left below) Note that N is the listener who is assumed to be at the same distance g from each speaker FR, PL, RR, and RL (Fig. 5 (e)).
, in this case, the delay time t and the volume V are constant.

In order to control the delay time and volume according to the listener,
For example, a display panel as shown in FIG. 4 can be provided on an instrument panel in the vehicle interior.

A display is provided to illuminate listeners 5PR, 5FL, 5RR, 5RL, and N, and above it are L (left), N (
Center), R (right) selector switch, F (front) on the right side
゛, N (center), R (rear) changeover switch is provided,
A specific listener is illuminated by pressing each switch.

In conjunction with this lighting display, the delay time and volume are controlled as shown in the table above.

Note that the means for switching to a specific listener may be a sliding volume other than the above-mentioned button switch.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an audio device according to the present invention, and FIGS. 2 and 3 are graphs showing the relationship between delay time and volume, respectively.
Figure 4 is a front view of the display panel, Figures 5(a) to 5(
e) is a plan view showing the distance between the listener and each speaker;
The figure is a plan view of the automobile, and FIG. 7 is a graph showing the relationship between each speaker and delay time. 11...Balance control circuit, 12...Fader control circuit, 13...Delay circuit, PR, FLlRRSRL...Speaker, Q1-Q4.
...Distance, t1-t4...Delay time, ■1-V4...
·Volume.

Claims (2)

[Claims] (1) In a vehicle audio system that reproduces output signals from a signal source using speakers placed at multiple locations in the vehicle interior, the delay time of the output signal corresponding to each of the speakers and the output corresponding to the delay time What is claimed is: 1. A vehicle acoustic device, characterized in that a signal attenuation rate is set, and a control means is provided for adjusting output in accordance with the delay time and the attenuation rate. (2) The vehicle audio device according to claim (1), wherein the delay time and attenuation rate are set in accordance with the distance between the listening position and each speaker.