JP2003204598A - Speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker system capable of solving a problem of deficient stereophonic image caused when a reproducing sound directly reaches a listener from speaker units 102, 103. <P>SOLUTION: The speaker system comprises: a first speaker unit to reproduce an L+R signal; a second speaker unit reproducing an L-R signal and placed at an angle of about 45 degrees to the left with respect to the first speaker unit; a third speaker unit reproducing an L-R signal at an angle of about 45 degrees to the right with respect to the first speaker unit; a first reflection wall arranged nearly in parallel with a vibration axis of the first speaker unit; and a second reflection wall arranged nearly in parallel with a vibration axis of the second speaker unit, the second speaker unit is placed at a position near the first reflection wall, and the third speaker unit is placed at a position near the second reflection plate. <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. FIG. 5 is a plan view of such a speaker device. A center speaker unit 101 for reproducing the L + R component on the front side, an L channel speaker unit 102 for reproducing the LR component on the left side, and an R for reproducing the RL component on the right side. A channel speaker unit 103 is provided. As shown in the drawing, the vibration axes of the speaker units 102 and 103 for the L channel and the R channel are arranged at an angle of 45 degrees toward the listener. Further, the reflection walls 104 and 10 are arranged so as to be parallel to the vibration axes of the L channel and R channel speaker units 102 and 103, respectively.
5 are provided.

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, and the reproduced sound of the R channel speaker unit 103 and the reflection wall 105.
The synthesized sound of the reproduced sound reflected by is emitted in the direction of arrow C, which is 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.

[0004]

The present applicant has conducted various experiments and researches on the above-mentioned speaker device, and one of the conclusions is that the speaker unit 1 for the listener is used.
It was found that when the reproduced sound reaches directly from 02 and 103, the stereo image becomes poor. This is because the reproduced sound is not emitted from the virtual point 106 in the directions of the arrows B and C.

[0005]

In order to solve the above-mentioned problems, the present invention is arranged on a first baffle plate to reproduce a L + R signal and a first speaker unit for reproducing an L + R signal. , A second speaker unit arranged on the second baffle plate so as to be arranged at an angle of approximately 45 degrees to the left with respect to the first speaker unit, and reproducing the RL signal and the first speaker. 45 to the right of the unit
A third speaker unit arranged on the third baffle plate so as to be arranged at an angle of degrees, a first reflection wall arranged substantially parallel to the vibration axis of the first speaker unit, and And a second reflection wall arranged substantially parallel to the vibration axis of the second speaker unit, and the second speaker unit is arranged at a position close to the first reflection plate of the second baffle plate, Further, the third speaker unit is arranged at a position on the third baffle plate which is close to the second reflector plate.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the embodiments shown in the drawings. In Dolby Digital, which is one of the multi-channel surround systems, there are three front side channels consisting of front L channel, front R channel and front center channel.
It is necessary to prepare speakers for two channels on the rear side, which are channels, rear L channels, and rear R channels, and one subwoofer channel, for a total of 6 channels.

The enclosure 200 shown in FIGS. 1 and 2 is used on the front side and the rear side. 1 is a plan view of such an enclosure 200, and FIG. 2 is a left side view thereof.
Center speaker units 201 and 202 for reproducing L + R components are provided on the front baffle plate 209. The baffle plate 210 arranged at an angle of 45 degrees with respect to the baffle plate 209 is provided with the L channel speaker unit 203 for reproducing the L-R component, so that the vibration axis of the L channel speaker unit 203 is The center speaker units 201 and 202 are arranged at an angle of 45 degrees.

On the right side, an R channel speaker unit 204 for reproducing the RL component is similarly arranged at an angle of 45 degrees with respect to the center speaker units 201 and 202. Therefore, the speaker units 203, 20
Nos. 4 are arranged so that their vibration axes form an angle of about 90 degrees. Reflection walls 207 and 208 are provided so as to be parallel to the vibration axes of the L channel and R channel speaker units 203 and 204, respectively.

The speaker units 203 and 204 have a horizontal center line 212 of the baffle plates 210 and 211, respectively.
It is arranged at a position closer to the virtual point 206 than 213 (the center line 212 is shown by a dotted line in FIG. 2). With this arrangement, the ratio of the sound emitted from the speaker units 203 and 204 being reflected by the reflection plates 207 and 208 increases, so that the reproduced sound from the speaker units 203 and 204 is directed from the virtual point 206 in the directions of arrows B and C. The rate of radiation is increased. As a result, it is possible to obtain a reproduced sound with a good localization feeling.

The speaker units 201 to 204 described above use units of the same shape. Further, since the center speaker units 201 and 202 are connected in parallel, for example, when the impedance of the speaker units 203 and 204 is 8Ω, the impedance of the center speaker units 201 and 202 is 16Ω.

FIG. 3 is a plan view showing a state in which the enclosure 200 is arranged with respect to the listener 13. 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 DVD player 20 C
When D 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 includes a front side enclosure 200, a subwoofer 204, and a rear side enclosure 1 which is the same as the front side enclosure 200.
00 and cables 22, 23, and 24, respectively. Signal processing device 30 and enclosures 100, 200
It is possible to connect the signal processing device 30 and the front-side enclosure 200, and the signal processing device 30 and the rear-side enclosure 100 with a single cable by connecting to and with a 6-core cable. Therefore, the number of speaker cables is significantly reduced as compared with the case where the speaker is installed in the corner of the room, and the aesthetics of the room is not spoiled.
Further, since a total of three speaker enclosures including the front-side enclosure 200, the rear-side enclosure 100, and the subwoofer 204 can construct a 5.1-channel system, 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 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 reproduced from the center speakers 201 and 202 connected in parallel.

The R channel signal whose level is adjusted by the variable resistor 46 from the L channel signal input to the L-in terminal 31.
The L-R signal generated by subtracting the channel signal by the subtractor 47 is amplified by the amplifier 61 and reproduced by the L-channel speaker 203. Similarly, the R-L signal generated by the subtracter 49 subtracting the L-channel signal whose level is adjusted by the variable resistor 48 from the R-channel signal input to the R-in terminal 32 is generated by the amplifier 63. The amplified signal is reproduced by the R-channel speaker 204.

The L-channel signal and the R-channel signal are added by the adder circuit 50, and 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. After that, it is reproduced by the subwoofer 205.

Therefore, the speaker 203 outputs the L-R signal, and the speaker 20 outputs the low-frequency and middle-frequency components of the L + R signal.
1 and 202, the RL signal is reproduced by the speaker 204, and the low frequency component of the L + R signal is reproduced by the subwoofer 205. By the above signal processing, the R channel signal having the opposite phase to the L channel signal and the L channel signal having the opposite phase to the R channel signal are added, so that the speaker spacing is sufficiently wide even if the speaker interval is narrow. The sound field space can be reproduced.

L + from the center speakers 201 and 202
When the high frequency component of the R signal is output, the sound image is concentrated in the vicinity of the center speakers 201 and 202, and the stereo image becomes poor. Therefore, as in the above embodiment, the LPF 42 is passed through the L + R signal to obtain a high frequency of about 2 KHz or more. It is prevented that the range component is reproduced from the center speakers 201 and 202.

Center speaker units 201 and 202
Since an addition signal of the L-channel signal and the R-channel signal is output to, the level of the input signal is higher than that of the L-channel speaker 203 and the R-channel speaker 204. Therefore, we have two speaker units,
By increasing the input withstand margin, it is possible to prevent distortion due to excessive input to the center speaker unit during high-volume playback. Further, since a large-diameter speaker is not used to increase the withstand input, large-volume reproduction is possible without sacrificing the high frequency characteristics of the speaker units 201 and 202.

Although the above description is for the circuit operation for reproducing a 2-channel audio signal, the present device can also input a Dolby Digital 5.1-channel signal. In this case, the output signal of the AV amplifier 21 includes the center channel signal on the front side on the C-in terminal 33 and the L channel signal on the rear side on the RL-in in addition to the L-in terminal 31 and the 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. , 202. On the other hand, by connecting the L-in terminal 31, the R-in terminal 33, and the C-in terminal 32 to the adder circuit 50, the front side three-channel signals are added. About 150 in this addition signal
A low-frequency signal below Hz is extracted by the LPF 51 and connected to the amplifier 64 via the variable resistor 55 for gain adjustment.

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 205, it is possible to reduce the diameter of the speaker units 201 to 204 used in the enclosures 100 and 200. In addition, for example, when the bass component is included only in the front L channel, the bass should originally be reproduced from the front left side, but since humans cannot identify the directionality of the bass component, it is arranged at an arbitrary position. Even if this bass is played from the subwoofer, no discomfort will occur.

In the above embodiment, the subwoofer 204 reproduces the low frequency components contained in the subwoofer signal, the front L channel, the front center channel and the front R channel. Therefore, when the low frequency signal is included only in the subwoofer channel, the decrease in the volume of the low frequency sound reproduced from the subwoofer should be reduced compared to the case where the low frequency components of all channels are added and added to the subwoofer channel. You can

RL-in terminal 33, RR-in terminal 34
After the rear L channel signal and the rear R channel signal input to the are added by the adder 82, the LPF 83 removes high frequency components of 2 KHz or more, and is amplified by the amplifier 92 via the variable resistor 84 for gain adjustment. Then, the sound is reproduced from the center speaker units 201 and 202.

Further, the rear R channel signal is set 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 L-R signal on the rear channel side is obtained. Is generated. The L-R signal is amplified by the amplifier 91 and reproduced by the speaker unit 203. Similarly, the rear L channel signal is adjusted by the 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 204.

Similar to the front side, the L-channel speaker 203 reproduces the anti-phase component of the R-channel signal, and the R-channel speaker 204 reproduces the anti-phase component of the L-channel signal. Similar to the enclosure 200, the speaker units 203, 2
Even if the interval with 04 is narrow, the sound image image is diffused in a wider range, and a wide stereo image can be reproduced.

In the above 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, the L-R signal is generated by subtracting the gain-adjusted R signal from the L channel signal, but depending on the speaker unit used and the environment of the room to be reproduced, 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.

Furthermore, in the above-described embodiment, the speaker units 203 and 204 are arranged at an angle of 45 degrees to the left and right with respect to the vibration axes of the speaker units 201 and 202, but the arrangement angle is from the virtual point 206. If the reproduced sound is emitted, a slight angle change is allowed.

[0028]

As described above, according to the present invention, since the speaker units 203 and 204 are arranged in the baffle plate at positions close to the reflection plate, the L channel signal and the R channel signal emitted from the speaker unit are respectively 180 degrees. Is emitted to the left and right at the angle of. Therefore, it is possible to provide a compact and cost-effective speaker device with a rich stereo image.

[Brief description of drawings]

FIG. 1 is a plan view of an enclosure 200.

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

FIG. 3 is a plan view showing a state where the enclosure 200 is installed in a room.

FIG. 4 is a block diagram of a signal processing device 30.

FIG. 5 is a plan view of a conventional enclosure 100.

FIG. 6 is a right side view of the conventional enclosure 100.

[Description of Reference Signs] 20 DVD player 21 AV amplifier 30 Signal processing device 200 Enclosures 201, 202 Center speaker unit 203 L
Speaker unit for channel 204 Speaker unit for R channel 205 Subwoofer 207, 208 Reflection wall

Claims (2)

[Claims] 1. A first speaker unit arranged on a first baffle plate for reproducing an L + R signal, and an angle of about 45 degrees left with respect to the first speaker unit for reproducing an L-R signal. And the second speaker unit arranged on the second baffle plate, which reproduces the RL signal, and is arranged at an angle of about 45 degrees to the right with respect to the first speaker unit. As described above, the third speaker unit arranged on the third baffle plate, the first reflection wall arranged substantially parallel to the vibration axis of the first speaker unit, and the second speaker unit A second reflection wall arranged substantially parallel to the vibration axis, wherein the second speaker unit is arranged at a position close to the first reflection plate of the second baffle plate, and Also 3 speakers Knit speaker apparatus characterized by being arranged at a position close to the second reflector in the third baffle plate. 2. The speaker device according to claim 1, wherein the first speaker unit is composed of a plurality of identical speaker units.