JP2003230190A - Speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the stereo image by reproducing the high band signal in a negative phase component positively. <P>SOLUTION: The speaker system comprises a first boost circuit 41 for boosting the high band in an L channel signal, a first speaker unit 102 for reproducing a boosted L channel signal minus an R channel signal, a second boost circuit 42 for boosting the high band in the R channel signal, a second speaker unit 103 for reproducing a boosted R channel signal minus the N channel signal, and a third speaker unit 101 disposed between the first and second speaker units 102 and 103 and reproducing the L channel signal plus the R channel signal. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device in which a plurality of speakers are provided in one housing.

[0002]

In US Pat. No. 6,069,962,
A speaker device has been proposed in which a plurality of speakers are provided in one housing and a stereo image is reproduced by these speakers. 2 and 3 show such a speaker device 100.
FIG. 3 is a plan view and a left side view of FIG. A center speaker unit 101 for reproducing the L + R component on the front side, an L channel speaker unit 102 for reproducing the L-R component on the left side,
An R channel speaker unit 103 for reproducing the RL component is provided on the right side. As shown, speaker units 102 for L channel and R channel, 1
The 03 vibration axis is oriented at a 45 degree angle towards the listener. Reflection walls 104 and 105 are provided so as to be parallel to the vibration axes of the L channel and R channel speaker units 102 and 103, respectively.

Therefore, the synthesized sound of the reproduced sound from the L-channel speaker unit 102 and the reproduced sound reflected by the reflection wall 104 is in front of the virtual point 106 by the arrow A.
Direction and the direction of arrow B, which is the direction of 90 degrees to the left, and the reproduced sound of the R channel speaker unit 103 and the reflection wall 10.
The synthesized sound of the reproduced sound reflected by 5 is emitted in the direction of arrow C, which is 180 degrees opposite to the direction of arrow B. With this configuration, a stereo image can be sufficiently obtained even if the distance between the speaker units 102 and 103 is short.

The band of the minus R signal in the L-R signal is set to 130 Hz to 1.9 KHz, and the high frequency signal is not included in the minus R signal. The purpose of this is to prevent the reproduction of annoying sound by removing the high frequency signal in the anti-phase component. Of course, the minus L signal in the RL signal is also in the frequency band of 130 Hz to 1.9 KHz. Here, the frequency characteristics of the plus L signal and the minus R signal reproduced by the speaker unit 102 are shown in FIG.

[0005]

The present applicant has conducted various experiments and researches on the above-mentioned speaker device, and one of the conclusions is that the high frequency signal in the anti-phase component greatly affects the stereo image. I understood. In particular, the stereo image could be improved by positively reproducing the high frequency signal in the negative phase component.

[0006]

In order to solve the above problems, the present invention subtracts an R channel signal from a boosted L channel signal and a first boost circuit 41 for boosting a high frequency band in the L channel signal. The first speaker unit 102 for reproducing the generated signal and the second boost circuit 4 for boosting the high frequency band in the R channel signal.
2, a second speaker unit 103 that reproduces a signal obtained by subtracting the L channel signal from the boosted R channel signal, and first and second speaker units 102,
A third speaker unit 1 arranged between 103 and reproducing an added signal of the L channel signal and the R channel signal.
01 and.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 4 is a plan view of a case where the above-mentioned speaker device 100 is arranged in front of and behind the listener 13 to form a multi-channel reproducing device. The DVD player 20 and the AV amplifier 21 are connected by an optical cable, and when a DVD is loaded on the DVD player 20, the video signal and the 5.1 channel audio signal before being decoded are input to the AV amplifier 21. The AV amplifier 21 decodes the audio signal from the DVD player 20 to convert it into a 5.1-channel audio signal, and then outputs it to the signal processing device 30. On the other hand, the CD in the DVD player 20
Is loaded, a 2-channel audio signal is output to the AV amplifier 21. Since video-related equipment such as a display is not directly related to the present invention,
The description is omitted.

The signal processing device 30 is connected to the front side enclosure 100, the subwoofer 205, and the rear side enclosure 200 having the same structure as the front side enclosure 100 and the cables 22, 23 and 24, respectively. Signal processing device 30 and enclosures 100, 20
It is possible to connect the signal processing device 30 and the front-side enclosure 100, and the signal processing device 30 and the rear-side enclosure 200 by a single cable by connecting the 0 to the 6-core cable. Therefore, the number of speaker cables is significantly reduced compared to the case where a speaker is installed in a corner of a room, and the appearance of the room is not impaired.
Also, there is no troublesome wiring. Further, since a total of three speaker enclosures including the front-side enclosure 100, the rear-side enclosure 200, and the subwoofer 205 can construct a 5.1-channel system, the number of speakers to be installed can be reduced.

FIG. 1 is a block diagram of the signal processing device 30. The L channel signal and the R channel signal in the stereo output signal of the CD player, the tuner, etc. are input to the L-in terminal 31 and the R channel signal, respectively. The two signals are added by the adder circuit 40 to form the L + R signal, and the switch 56 is switched and controlled by the microcomputer.
Is input to the first fixed terminal of.

When reproducing a two-channel signal such as a reproduction signal of a CD player, the switching control means 57 causes the movable contact of the switch 56 to have an addition circuit 40 as shown in FIG.
Switch to the position to connect to. As a result, the adder circuit 4
The output of 0 is input to the amplifier 62 via the variable resistor 43 for gain adjustment and reproduced from the center speaker 101.

The L channel signal input to the L-in terminal 31 is boosted by the boost circuit 41 in a required frequency band of about 2 KHz or more. A subtractor 47 subtracts the R channel signal whose level is adjusted by the variable resistor 46 from the L channel signal whose high frequency band is boosted. The L-R signal generated by this subtraction is amplified by the amplifier 61 and reproduced by the L-channel speaker 102. Similarly, from the R channel signal that is input to the R-in terminal 32 and the high frequency signal of 2 KHz or higher is boosted by the boost circuit 42,
The subtractor 49 subtracts the L channel signal whose level is adjusted by the variable resistor 48. The RL signal generated by this subtraction is amplified by the amplifier 63 and reproduced by the R channel speaker 103.

The L-channel signal and the R-channel signal are added by the adder circuit 50, a low-frequency signal of 150 Hz or less is extracted by the LPF 51, and then amplified by the amplifier 64 via the variable resistor 55 for gain adjustment. It is input to the subwoofer 105.

Therefore, the L-R signal is reproduced by the speaker 102, the L + R signal is reproduced by the speaker 101, the R-L signal is reproduced by the speaker 103, and the low frequency component of the L + R signal is reproduced by the subwoofer 105. By the above-mentioned signal processing, an R channel signal having an opposite phase to the L channel signal and an L channel having an opposite phase to the R channel signal
Since the channel signals are added, a sufficiently wide sound field space can be reproduced even if the speaker interval is narrow.

Further, the L-R input to the speaker 102
Since the signal is boosted in the high frequency range of the L signal, there is a gain difference with the negative R channel signal in the high frequency range. This gain difference contributes to the improvement of the stereo image. The frequency characteristics of the L signal and the minus R signal are shown in FIG.

Although the above description is for the circuit operation for reproducing a 2-channel audio signal, the present apparatus can also input a Dolby Digital 5.1-channel signal which is one of the multi-channel signals. in this case,
The output signal of the AV amplifier 21 is the above-mentioned L-in terminal 31,
In addition to the R-in terminal 32, the front center channel signal is to the C-in terminal 33, the rear L channel signal is to the RL-in terminal 34, and the rear R channel signal is to the RR-in terminal 35. Also, the subwoofer signal is Su
It is input to the b-in terminal 36.

At the time of reproducing the Dolby Digital 5.1 channel signal, the switching control means 57 including a microcomputer detects the signal format and switches the movable contact of the switch 56 to the second fixed terminal. Therefore, the center channel signal input to the C-in terminal 33 is amplified by the amplifier 62 via the variable resistor 43 for gain adjustment and reproduced from the center speaker unit 101. On the center channel, the serifs and other monaural sound effects that are localized in the center of the screen are recorded. Therefore, as compared with the case where the L + R signal of the monaural component is further added to the center channel signal and output, the speaker units 101 to 1
The monaural component in the reproduced sound from 03 decreases,
It does not spoil the stereo image.

On the other hand, the L-in terminal 31 and the R-in terminal 3
2. By connecting the C-in terminal 33 to the adder circuit 50, front side three-channel signals are added.
The low frequency signal of about 150 Hz or less in this addition signal is L
Variable resistor 5 for gain adjustment extracted by PF51
5 to the amplifier 64.

Therefore, not only the subwoofer signal input to the Sub-in terminal 36 but also the front L channel,
Since the low-frequency components included in the front center channel and the front R channel are reproduced by the subwoofer 105, it is possible to reduce the diameter of the speaker units 101 to 103.

On the other hand, after the rear L channel signal and the rear R channel signal input to the RL-in terminal 34 and the RR-in terminal 35 are added by the adder 81, the gain is adjusted via the variable resistor 84 for gain adjustment. After being amplified by 92, it is reproduced from the center speaker unit 201.

The rear L channel signal input to the RL-in terminal 34 is boosted by the boost circuit 82 in a required frequency band of about 2 KHz or more. From the rear L channel signal with this high frequency boosted, a variable resistor 85
The rear R channel signal whose level has been adjusted by is subtracted by the subtractor 86. The rear L-R signal generated by this subtraction is amplified by the amplifier 91,
It is reproduced by the rear L channel speaker 202. Similarly, it is input to the RR-in terminal 35 and 2 KHz
The rear R channel signal whose level is adjusted by the variable resistor 87 is subtracted from the rear R channel signal whose high frequency signal is boosted by the boost circuit 83.
Is subtracted by. The rear R-L signal generated by this subtraction is amplified by the amplifier 93 and reproduced by the rear R channel speaker 203.

Similarly to the front side, the speaker unit 202 for the L channel reproduces the opposite phase component of the R channel signal and the speaker 203 for the R channel reproduces the opposite phase component of the L channel signal. , 203, the sound image image is diffused in a wider range even if the interval is narrow, and a wide stereo image can be obtained.

The rear L input to the speaker 202
The −R signal is boosted in the high range of the rear L signal, so that a gain difference occurs between the −R signal and the minus R channel signal in the high range. This gain difference contributes to the improvement of the stereo image.

In this embodiment, the front side enclosure 100 and the rear side enclosure 200 are provided.
And speaker units 101 to 103, 201 to 20
Although the same number 3 is used, the present invention is not limited to this, and it is also possible to use, for example, a speaker unit on the front side having a large diameter.

The changeover control means 57 controls the changeover operation of the switch 56. However, the changeover switch provided on the front panel of the apparatus may be used by the listener to manually change over the switch 56.

In the above-described embodiment, the L + R signal is not input to the center speaker unit 101 at the time of reproducing the multi-channel signal, but the present invention is not limited to this, and the level of the L + R signal may be changed. You may decrease and input a little.

In the above-described embodiment, the low frequency components included in the subwoofer signal, the front L channel, the front center channel and the front R channel are added by the adding circuit 50 and reproduced by the subwoofer 204. Without being limited to
It is also possible to eliminate the adder circuit 50, add only the subwoofer channel signal to the subwoofer, and reproduce the low frequency component of the signal input to each of the other speaker units.

Further, in the above-described embodiment, as shown in FIGS.
As shown in FIG. 3, the speaker unit 102, 103 or 20 is attached to the vibration axis of the speaker unit 101 or 201.
Although the enclosure 100 or 200 having a shape in which 2 and 203 are respectively arranged at an angle of 45 degrees to the left and right is used, if it is a speaker for reproducing the L + R signal, the L-R signal and the L + R signal, the enclosure is particularly The shape is not limited to.

[0028]

As described above, according to the present invention, by raising the high frequency range of the L signal in the LR signal or the R signal in the RL signal and providing a gain difference with the negative signal, a stereo image is obtained. It is possible to provide a speaker device that is rich in sound.

[Brief description of drawings]

FIG. 1 is a block diagram of a signal processing device 30.

FIG. 2 is a plan view of the enclosure 200.

FIG. 3 is a right side view of the enclosure 200.

FIG. 4 is a plan view showing a state where the enclosure 200 is installed in a room.

FIG. 5 is a diagram showing frequency characteristics of an L signal and a minus R signal in the present embodiment.

FIG. 6 is a diagram showing frequency characteristics of an L signal and a minus R signal in the related art.

[Explanation of symbols]

20 DVD player 21 AV amplifier 30 signal processing device 100, 200 enclosure 101, 201 center speaker unit 102, 202 L channel speaker unit 103, 203 R channel speaker unit 205 subwoofer

Claims (4)

[Claims] 1. A first boost circuit 41 for boosting a high frequency band of an L channel signal, and a first speaker unit 1 for reproducing a signal obtained by subtracting an R channel signal from the boosted L channel signal.
02, and second for boosting high frequencies in the R channel signal
And a second speaker unit 103 which reproduces a signal obtained by subtracting the L channel signal from the boosted R channel signal, and is arranged between the first and second speaker units 102 and 103. A third speaker unit 101 for reproducing the added signal of the L channel signal and the R channel signal
And a speaker device. 2. The first to third speaker units 101.
10. The speaker device according to claim 1, wherein the enclosures 103 to 103 are housed in one enclosure 100. 3. A first boost circuit 41 for boosting a high frequency band in a front front L channel signal, and a first speaker unit 102 for reproducing a signal obtained by subtracting the front R channel signal from the boosted front L channel signal. A second boost circuit 42 for boosting high frequencies in the front R channel signal; and a second boost circuit 42 for reproducing a signal obtained by subtracting the front L channel signal from the boosted front R channel signal.
Is disposed between the speaker unit 103 and the first and second speaker units,
A third speaker unit 101 for reproducing the center channel signal and a third speaker unit for boosting the high frequency range in the rear L channel signal.
Boost circuit 82, a fourth speaker unit 202 for reproducing a signal obtained by subtracting the rear R channel signal from the boosted rear L channel signal, and a fourth boost circuit for boosting a high frequency band in the rear R channel signal. 83, and the rear L from the boosted rear R channel signal
It is arranged between a fifth speaker unit 203 for reproducing a signal obtained by subtracting a channel signal and the third and fourth speaker units 202, 203, and reproduces an added signal of the rear L channel signal and the rear R channel signal. And a sixth speaker unit 201 for controlling the speaker device. 4. The first to third speaker units 101.
˜103 and the fourth to sixth speaker units 201
~ 203 are one enclosure 100, 20 respectively
The speaker device according to claim 3, wherein the speaker device is housed in 0.