JPH0140560B2 - - Google Patents

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.

Figure 1 schematically shows the interior of an automobile. Speakers 2 and 3 are arranged on the left and right sides of the front of the interior of the vehicle 1, and speakers 4 and 5 are placed on the left and right of the rear.
is located. 6 is the driver (listener), L,
R is the left and right ears of the listener 6, and the listener 6 listens to the sound emitted from the speakers 2, 3, 4, and 5. 7A, 7B are electric circuits, and two-channel signals l, r are applied to the speakers 2, 3 and 4, 5 via the electric circuits 7A, 7B.

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

In FIG. 2, H _1R and H _1L are transfer functions between the speaker 3 and the left and right ears L and R of the listener 6, and H _2R ,
H _2L is the transfer function between the speaker 2 and the left and right ears L and R of the listener 6, H〓 _R , H〓 _L is the transfer function between this speaker and the left and right ears L of the listener 6 when the speaker is placed at point P, It is a transfer function between the sound pressure radiated from the speakers 2 and 3 and applied to the left and right ears L and R of the listener 6 via the transfer functions H _1R , H _1L , H _2R , and H _2L , and the sound pressure at the point P. Transfer function radiated from placed speakers
If the sound pressures applied to the left and right ears L and _R of the listener 6 through H〓 _L and H〓 R are equal, the listener 6 hears the sound from point P while listening to the sound radiated from the speakers 2 and 3. It feels like listening to sound, and this can be achieved by connecting the circuit block shown in FIG. 2 before the speakers 2 and 3. 8 is a delay circuit for correcting the distance difference between the speakers 2, 3 and the listener 6.

According to the experiments of the present invention, the circuit blocks H _2R・H _1L /H _1R・H _2L and H _2R・H〓 _L /H _2L・H in FIG.
It was found that the above effect can be obtained even without _R.

In this way, the circuit block H _1R・H〓 _L −H _1L・H〓 _R /H _2L・H〓 _R −H _2R・H〓 _L and H〓 _R /H _1R and the delay circuit are installed before the speakers 2 and 3. By connecting 8, speakers 2, 3
The listener 6 can be made to feel as if he/she is listening to the sound from point P while listening to the sound radiated from the point P.

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. In FIG. 3, 8 is the delay circuit, and 9 is the delay circuit.
H _1R・H〓 _L −H _1L・H〓 _R /H _2L・H〓 _R −H _2R・H〓 Equalizer with the characteristic of _L , 10 is the equalizer with the characteristic of H〓 _R /H _1R , 1 1 is The left and right channel signals added by the adder 11 are added with reverberation by a reverberation adding circuit 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 signal added by 4 is passed through the equalizer 10 to 2
One side is applied to the speaker 3 via a delay circuit 8 and an amplifier 16. Further, the output of the equalizer 10 is sent to the adder 17 via the equalizer 9 to the adder 1.
3 and is applied to the speaker 2 via the amplifier 15.

When two channel signals r and l are applied to the speakers 2 and 3 via the electric circuit 7A shown in FIG. 3, the speaker 3 is moved to point P in FIG. Similar listening conditions can be obtained, and a sense of spaciousness can be obtained even in a small room.

In particular, in this example, since the reverberation signal also passes through the equalizers 9 and 10, 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. Electric circuit 7B in Figure 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 5 via the electric circuit 7B, the listener 6 receives the same effect as if the speaker 5 were moved to point Q. That's what you get.

In this way, this embodiment is equipped with an equalizer that converts the transfer function between the speaker and the listener into the transfer function between the speaker and the listener, which is equivalent to widening the speaker spacing, and Since the two-channel signal and the reverberant signal are radiated 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. , obtain a signal by adding the 2-channel signal and the reverberant signal,
Since this added signal is applied to the left and right speakers via an equalizer and a delay circuit, the reverberant sound is equivalent to being radiated from the expanded sound image position of the speakers, and the reverberant sound is equivalent to being radiated from the expanded sound image position of the speakers. This has the advantage that the reverberant sound can be clearly localized even outside the interval, and the spread is wider.

[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 same 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, 1
3, 14... Adder, 15, 16... Amplifier, 1
7... Adder.

Claims (1)

[Claims] 1. Convert the transfer function between the two speakers placed in the vehicle interior and the left and right ears of the listener to the transfer function between the different points from the speakers and the left and right ears of the listener. It comprises an equalizer, 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, An in-vehicle sound reproducing device characterized in that a signal obtained by adding the reverberation signals of is applied to the speaker via the equalizer and the delay circuit.