JPS59107700A - On vehicle acoustic reproducing device - Google Patents

Abstract

PURPOSE:To obtain an on vehicle acoustic reproducing device having spreading feeling by impressing a signal adding a 2-channel signal and an echo signal from an echo adding circuit to two speakers arranged in a compartment via an equalizer and a delay circuit. CONSTITUTION:Speakers 2, 3 are arranged left and right of the front in a compartment and sepakers 4, 5 are arranged left and right of the rear part in addition. A listner 6 listens to sound radiated from speakers 2-5 and two channel signals l, r are impressed to the speakers 2, 3 and 4, 5 via electric circuits 7A, 7B. The signals l, r are added 11 and an echo is added by the echo adding circuit 12. The echo signal is added to the signals l, r by address 13, 14. The added (14) signal is divided into two via an equalizer 10; one is impressed 10 to the speaker 3 via a delay circuit 8 and an amplifier 16. Further, the other is added 17 with an output of the adder 13 via an equalizer 9 and impressed to the speaker 2 via an amplifier 15. The circuit 7B is constituted similarly and the spreading feeling is obtained even at a narrow compartment.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-vehicle sound reproducing device used in the interior of an automobile, and provides an in-vehicle sound reproducing device with a simple circuit configuration that provides a sense of spaciousness even when listening in a narrow vehicle interior. It is.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows the interior of a vehicle. Speakers 2 and 3 are arranged on the left and right sides of the front of the interior of the vehicle 1, respectively, and speakers 4 and 6 are arranged on the left and right of the rear. 6
is the driver (listener), L.

R is the left and right ears of the listener 6, and the listener 6 is the speaker 2.
．． 3.4.5 to listen to the sound emitted from the device.

7A and 7B are electric circuits, and 2-channel signals 42.
The speakers 2 and 3 are connected to the speakers 2 and 3 via the electric circuits 7A and 7B.
and is applied to speaker 4.6.

FIG. 2 shows a circuit that makes the user feel that the sound is being radiated from the speaker placed at point P while listening to the sound radiated from the speakers 2 and 3.

In Figure 2, H1R2H1L is the transfer function between speaker 3 and listener 6's left and right ears, R, H2R2H2L is the transfer function between speaker 2 and listener 6's left and right ears, R, H
φR2HφL places the speaker at point P and 3beko! This speaker and listener 6's left and right ears in this case.

This is the transfer function between R, and the sound pressure radiated from the speakers 2 and 3 and applied to the left and right ears of the listener 6 through the transfer function HIRIHILIH2RIH2L to R, and the speaker y placed at point P, 1: The radiated transfer function H, t,
L.

If the sound pressure applied to listener 6's left and right views and H through H, t, and R are equal, the sound radiated from speakers 2 and 3 will not be heard. This can be achieved by connecting the circuit block shown in FIG. 2 before the speaker 2.3.

8i1 is a delay path for correcting the distance difference between the speakers 2 and 3 and the listener 6.

According to the inventor's experiments, it was found that the above effect can be obtained even in the circuit block shown in FIG. 2.

In this way, the circuit block and delay circuit 8 are connected before the speakers 2 and 3.
Listener 6d listens to the sound radiated from point P while listening to the sound radiated from point P: J: It can make you feel like a sea urchin.

The present invention is based on the above principle, and one embodiment of the present invention will be described below with reference to FIG. 3. Third
In the figure, 8 is the delay circuit, 9 is an equalizer, and 11 is an adder.The left and right channel signals added by the adder 11 are added with reverberation by a reverberation adding circuit 12 including a delay element such as a BBD.

This reverberation signal is added to the right channel signal r and the left channel signal l by adders 13 and 14, respectively. Adder 1
The signals added in step 4 are divided into two parts via an equalizer 1o, and one is applied to the speaker 3 via a delay circuit 8 and an amplifier 6 page 2-16. Further, the output of the equalizer 10 is added to the output of the adder 13 via the equalizer 9 in an adder 17, and is added to the output of the adder 13 via the amplifier 15.
is applied to.

A two-channel signal r is transmitted through the electric circuit 7A shown in FIG.
, l are applied to the speakers 2 and 3, a listening condition similar to that obtained by moving the speaker 3 to the point P and increasing the distance between the speakers 2 and 3 in Fig. 1 can be obtained, and a sense of spaciousness can be obtained even in a small room. That's what you get.

In particular, in this example, since the reverberation signal also passes through the equalizers 9 and 1o, the reverberation is also radiated from the direction of point P and the direction of the speakers 2, which further increases the sense of spaciousness. The electric circuit 7B in FIG. 1 has the same configuration as the circuit 7A, and when the left and right channel signals r and l are applied to the speakers 4 and 6 via the electric circuit 7B, the listener 6 moves the speaker 5 to the Q point. The same effect can be obtained by moving it.

In this way, in Example 1, an equalizer is provided that converts the transfer function between the speaker and the listener into a transfer function between the speaker and the listener, which is equivalent to widening the speaker spacing. Since the two-channel signal and the reverberation signal are emitted from the speaker via an equalizer, a sense of spaciousness can be obtained.

As described above, according to the present invention, an effect equivalent to widening the speaker spacing can be obtained, and a sense of spaciousness can be obtained even when listening in a narrow vehicle interior.In particular, with the present invention, reverberant sound is also moved. Since the radiation is emitted from a loudspeaker, it has the advantage of having a large spreading effect.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an in-vehicle sound reproducing device according to an embodiment of the present invention, FIG. 2 is a block diagram of the main parts of the device, and FIG. 3 is a block diagram of the device. 1... Vehicle interior, 2, 3, 4.5... Speaker, 6... Listener, L, R... Ear.
7A, 7B... Electric circuit, 8... Delay circuit, 9, 10... Equalizer, 11...
...Adder, 12...Reverberation addition circuit, 13゜7- 14...Adder, 15.16...Amplifier,
17...Adder. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 112~

Claims (1)

[Claims] Two speakers arranged in a vehicle interior, and an equalizer that converts a transfer function between the speakers and the listener's left and right ears into a transfer function between a different point from the speakers and the listener's left and right ears. and a delay circuit that corrects the distance difference between the speaker and the listener, and a reverberation addition circuit that adds reverberation to the summed signal obtained by adding the two channel signals, A vehicle-mounted sound reproducing device characterized in that a signal obtained by adding a reverberation signal is applied to the speaker via the equalizer and the delay circuit.