JP2003037898A - Speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a more real reproduction sound. SOLUTION: This speaker system is provided with a speaker unit 202 for an L channel for reproducing a signal obtained by subtracting an R channel signal from an L channel signal, a speaker unit 203 for an R channel mounted in almost the same height of the speaker unit for the L channel for reproducing a signal obtained by subtracting the L channel signal from the R channel signal, a center speaker unit 201 mounted so as to be higher than the speaker unit 202 for the L channel and the speaker unit 203 for the R channel for reproducing a signal obtained by adding the L channel signal to the R channel signal, and an enclosure 200 in which the speaker 202 for the L channel and the speaker unit 203 for the R channel and the center speaker unit 201 are incorporated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker system device.

[0002]

2. Description of the Related Art Normally, in order to reproduce a stereo signal,
Ideally, the L channel speaker and the R channel speaker are placed in front of the listener with a required distance, and the line connecting the two speakers and the listener is an equilateral triangle. On the other hand, US Pat. No. 6,069,962 proposes a speaker device in which a plurality of speakers are provided in one housing and a stereo image is reproduced by these speakers.

FIG. 7 is a plan view of such a speaker device. A center speaker unit 301 for reproducing the L + R component on the front side, an L channel speaker unit 302 for reproducing the LR component on the left side, and an RL component on the right side. An R channel speaker unit 303 for reproduction is provided. The speaker units 302 and 303 for the L channel and the R channel are arranged at an angle of 45 degrees toward the listener. Reflection walls 304 and 305 are provided at an angle of 90 degrees with the L-channel and R-channel speaker units 302 and 303, respectively.

Therefore, the synthesized sound of the reproduced sound from the L-channel speaker unit 302 and the reproduced sound reflected by the reflection wall 304 is in front of the virtual point 306 and is indicated by an arrow A.
Direction, the synthesized sound of the reproduced sound of the R channel speaker unit 303 and the reproduced sound reflected by the reflection wall 305 is emitted in the arrow C direction opposite to the arrow B direction. It

Since the reflection wall 104 is provided so that the sound emitted from the first speaker unit 302 arranged at an angle of 45 degrees with the direction of arrow B is directed in the direction of arrow B, it is a material with good reflection efficiency. Has been done. Of course, the reflection wall 305 has the same structure. With this configuration, a stereo image can be sufficiently obtained even if the distance between the speaker units 302 and 303 is short.

[0006]

As a result of researching and developing the above-described speaker, it is possible to obtain a more realistic reproduced sound by increasing the localization height of the L + R signal, especially for vocals localized in front of the listener. I understood.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention reproduces a signal obtained by subtracting an R channel signal from an L channel signal, and an L channel speaker unit and an L channel speaker unit are substantially the same. An R channel speaker unit that is mounted at a height and reproduces a signal obtained by subtracting the L channel signal from the R channel signal, and is mounted at a position higher than the L channel speaker unit and the R channel speaker unit, A center speaker unit for reproducing a signal obtained by adding the R channel signal, and L
A channel speaker unit, an R channel speaker unit, and an enclosure incorporating the center speaker unit.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the embodiments shown in the drawings. Dolby Digital, which is one of the multi-channel surround systems, has 3 channels for front, 3 channels for L channel, R channel, and center channel, 2 channels for rear L channel, 1 channel for subwoofer, and 6 channels for subwoofer. It is necessary to prepare a speaker.

The enclosure 200 shown in FIGS. 1 and 2 is used on the front side. FIG. 1 shows such an enclosure 2
00 is a plan view, and FIG. 2 is a right side view thereof, showing L + on the front.
A center speaker unit 201 for reproducing the R component is provided, and an L channel speaker unit 202 for reproducing the L-R component is provided on the left side of the center speaker unit 2.
01 is arranged in the opposite direction. R on the right
-R channel speaker unit 2 for reproducing L component
03 also faces the center speaker unit 201 in the opposite direction. This is the enclosure 200
This is because it is designed on the assumption that the wall 10 exists on the back surface of the speaker unit, and is arranged so that the reproduced sound from the speaker units 202 and 203 is radiated toward the wall 10 at an angle of approximately 45 degrees. Therefore, the speaker units 202 and 203 are arranged such that their vibration axes form an angle of about 90 degrees.

As a result, the speaker unit 202 is located at the reflection point 11 where the reproduced sound from the speaker unit 202 is reflected by the wall 10, and the speaker unit is located at the reflection point 12 where the reproduced sound from the speaker unit 203 is reflected by the wall 10. 203 will be virtually located. Therefore, even though the speaker units 202 and 203 are compactly arranged in one enclosure 200, this is the same as when the interval between the speaker units 202 and 203 is virtually widened, so that the reproduction is performed. It is possible to expand the stereo image.

The mounting height of the center speaker unit 201 is the L channel speaker unit 20.
2, differently arranged for the R channel speaker unit 203. As a result, the source of the reproduced sound from the speaker unit 201 that reproduces the positive phase component and the source of the reproduced sound from the speaker units 202 and 203 that reproduces the negative phase component are clearly different in the height direction, so that the localization of the reproduced sound is performed. I found that the feeling improves. Particularly, as shown in FIG. 4, it is possible to obtain a preferable result in terms of sound quality by raising the center speaker unit 201.

The rear side enclosure 100 is shown in FIG. 3 which is a plan view thereof and FIG. 4 which is a front view thereof. On the front of the enclosure 100 is a center speaker unit 10 for reproducing the sum component of the rear L channel and the rear R channel.
1. L channel speaker unit 102 for reproducing the L-R component obtained by subtracting the rear R channel from the rear L channel, and speaker unit 103 for rear R channel reproducing the R-L component obtained by subtracting the rear L channel from the rear R channel Is provided.

The L channel and R channel speaker units 102 and 103 are center speaker units 1.
01 at an angle of about 50 degrees, respectively. Also, like the front enclosure 200,
The speaker units 102 for L channel and R channel are arranged so that their heights are different from those of the speaker unit 101, which contributes to improving the localization of reproduced sound.

FIG. 5 is a plan view showing a state in which the enclosure 200 is installed in the front and the enclosure 100 is installed in the rear of the listener 13. DVD player 20 and AV
The amplifier 21 is connected by an optical cable, and when a DVD is loaded on the DVD player 20, the 5.1 channel audio signal before being decoded and the video signal is input to the AV amplifier 21. AV amplifier 21 is a DVD
The audio signal from the player 20 is decoded and converted into a 5.1 channel audio signal, and then output to the signal processing device 30. On the other hand, when a CD is loaded on the DVD player 20, a 2-channel audio signal is output to the AV amplifier 21.

The signal processing device 30 includes a front enclosure 200, a subwoofer 204, a cable 22,
23 and the infrared rays are connected to the rear enclosure 100. Therefore, by connecting the signal processing device 30 and the enclosure 200 with a 6-core cable, the signal processing device 30 and the speaker device 200 on the front side can be connected with one cable. Further, since the rear side enclosure 100 is connected by infrared rays, there is no cable. Therefore, compared to installing a speaker in the corner of the room,
The number of speaker cables is remarkably reduced, and the aesthetics of the room are not spoiled. Moreover, since a 5.1-channel system can be constructed by the front-side enclosure 200, the rear-side enclosure 100, and the subwoofer 204, the number of speakers to be installed can be reduced.

FIG. 6 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. These two signals are added by an adder circuit 40 to obtain an L + R signal, and a low-pass filter (hereinafter, L + R signal) is passed through an adder circuit 41.
After passing through a high frequency component of about 2 KHz or more by passing through the PF) 42, it is input to the amplifier 62 via the variable resistor 43 for gain adjustment, and the center speaker 201
Played from.

The low-frequency signal of about 150 Hz or less of the L + R signal passing through the LPF 44 is amplified by the amplifier 64 via the adding circuit 45 and then reproduced by the subwoofer 204.

The level of the L channel signal input to the L-in terminal 31 is adjusted by the variable resistor 46.
The channel signal is subtracted by the subtractor 47 to form an L-R signal, which is then amplified by the amplifier 61 and reproduced by the L-channel speaker 202. Similarly, the level of the R channel signal input to the R-in terminal 32 is L adjusted by the variable resistor 48.
The channel signal is subtracted by the subtractor 49 to become an RL signal, which is then amplified by the amplifier 63 and reproduced by the R channel speaker 203.

Therefore, the speaker 202 outputs the L-R signal, and the speaker 201 outputs the low-frequency and middle-frequency components of the L + R signal.
Thus, the RL signal is reproduced by the speaker 203, and the low frequency component of the L + R signal is reproduced by the subwoofer 204. By the above signal processing, a negative R channel signal is added to the L channel signal and a negative L channel signal is added to the R channel signal. Therefore, even if the speaker interval is narrow, the sound field is wide enough. The space can be reproduced.

Since the high frequency component has a great influence on the localization of the sound image, the LPF 42 prevents the high frequency component of the L + R signal from being output from the center speaker 201.

Further, by arranging the enclosure 200 close to the wall 10, the L-R signal and the R-L signal are reflected by the wall 10 and then toward the listener, as shown by arrows in FIG. The sound image image is spread over a wider area, and a wider stereo image can be reproduced.

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. In this case, the output signal of the AV amplifier 71 has the front-side center channel signal at the C-in terminal 33 and the rear-side L channel signal at the RL-in in addition to the above-described L-in terminal 31 and R-in terminal 32. The rear R channel signal is input to the terminal 34, the rear woofer signal is input to the RR-in terminal 35, and the subwoofer signal is input to the Sub-in terminal 36.

By connecting the C-in terminal 33 to the adder 41, the center channel signal of the Dolby digital signal is added to the above-mentioned L + R signal and the high frequency component is removed by the LPF 42, and then the center speaker unit 201. Played from. On the other hand, the C-in terminal 33,
RL-in terminal 34, RR-in terminal 35, Sub-i
By connecting the n terminal 36 to the adding circuit 50, the rear L channel signal, the rear R channel signal, and the subwoofer signal are added. About 150H in this addition signal
A low-frequency signal equal to or lower than z is extracted by the LPF 51, added to the low-frequency signals of the front L-channel signal and the front R-channel signal by the adder circuit 45, and then connected to the amplifier 64 via the variable resistor 55 for gain adjustment. It

Therefore, the subwoofer 204 reproduces not only the signal input to the subwoofer input terminal 35 but also the low frequency components included in all channels, so that the speaker device 10
Since the subwoofer 204 can reproduce low-frequency components that cannot be reproduced due to the small diameter of the speaker units used for 0 and 200, there is no loss of bass that affects the sensation of reality. Since humans cannot identify the direction of the bass component, it cannot be recognized that the bass is being reproduced from the left side of the rear side even when the bass component is included only in the rear L channel. Therefore, even if the bass to be originally reproduced from the left side of the rear is reproduced from the subwoofer, no discomfort is caused.

RL-in terminal 33, RR-in terminal 34
The rear L channel signal and the rear R channel signal input to are converted into serial signals by the signal conversion circuit 52 and then output from the light emitting device 53 as infrared rays. The light receiving device 80 provided in the rear speaker device 100 receives this infrared light and demodulates it into a two-channel signal by the signal conversion circuit 81. The demodulated rear L channel signal and rear demodulated R channel signal are respectively added by an adder 82, a high frequency component is removed by an LPF 83, and amplified by an amplifier 92 via a variable resistor 84 for gain adjustment. It is reproduced from the center speaker unit 101.

The rear R channel signal is adjusted to a predetermined level by the variable resistor 85 for gain adjustment, and then subtracted from the rear L channel signal by the subtractor 86, so that the rear channel L-R signal is obtained. Is generated. The L-R signal is amplified by the amplifier 91 and reproduced by the speaker unit 102. Similarly, the rear L-channel signal has a variable resistor 8 for gain adjustment.
After being set to a predetermined level by 7, the subtracter 88 subtracts from the rear R channel signal to generate a rear channel RL signal. This RL
The signal is amplified by the amplifier 93 and reproduced by the speaker unit 103.

Similar to the front side, the speaker 102 for L channel reproduces the opposite phase component of the R channel signal, and the speaker 103 for R channel reproduces the opposite phase component of the L channel signal.
Similar to 0, even if the distance between the speaker units 102 and 103 is narrow, the sound image image is diffused in a wider range, and a wide stereo image can be reproduced.

In the above-mentioned embodiment, the reproduction signal is transmitted to the rear side enclosure by infrared rays, but the present invention is not limited to this, and one speaker cable is used for wired connection. It is also possible to transmit the signal by.

In the above embodiment, the L-R signal is generated by subtracting the gain-adjusted R signal from the L channel signal. For example, subtraction processing or addition processing may be performed with frequency characteristics such as generation of an L-R signal by subtracting the R channel middle band signal from the L channel signal.

[0030]

As described above, according to the present invention, it is possible to reproduce a stereo signal with one speaker box, and particularly, a monaural component such as vocal is localized above other components. This enables more realistic reproduction.

[Brief description of drawings]

FIG. 1 is a plan view of a front side enclosure 200. FIG.

2 is a right side view of the front side enclosure 200. FIG.

FIG. 3 is a plan view of the rear side enclosure 100.

FIG. 4 is a front view of the rear side enclosure 100.

FIG. 5 is a plan view showing a state where the enclosures 100 and 200 are installed in a room.

FIG. 6 is a block diagram of a signal processing device 30.

FIG. 7 is a plan view of a conventional speaker 300.

[Explanation of symbols]

10 wall 20 DVD player 21 AV amplifier 30 signal processing device 100 rear side enclosure 101 rear side center speaker unit 102 rear side L channel speaker unit 103 rear side R channel speaker unit 200 front side enclosure 201 front side center speaker unit 202
Front side L channel speaker unit 203 Front side R channel speaker unit 204 Subwoofer

Claims (2)

[Claims] 1. An L channel speaker unit for reproducing a signal obtained by subtracting an R channel signal from an L channel signal, and an L channel speaker unit mounted at substantially the same height as the L channel speaker unit. An R channel speaker unit 203 which reproduces a signal obtained by subtracting a signal, and a signal which is attached to a position higher than the L channel speaker unit and the R channel speaker unit and reproduces the L channel signal and the R channel signal Center speaker unit 201 for reproduction
A speaker system comprising: an L channel speaker unit 202; an R channel speaker unit 203; and an enclosure 200 incorporating the center speaker unit 201. 2. The L-channel speaker 202 and R
The channel speaker 203 is arranged so as to face in a direction opposite to the front center speaker 201 facing the listener so as to radiate at a predetermined angle toward a wall located in front of the listener. The speaker system according to claim 1.