KR101161453B1 - Sound reproduction method and sound reproduction system - Google Patents

Abstract

The sound reproduction of the low range sound is also provided using a speaker, and a sound reproduction system that can reduce the propagation of the low range sound to a neighboring house or the like even when reproducing at a high volume. Holding means 22 without attaching the low frequency speaker units 11SW1 to 11SW4 which receive the audio signal of the low frequency channel of a plurality of channels, and reproduces the low frequency sound to the baffle board so that the sound from the front and back of the diaphragm can be added. By holding it near the ear of the listener 1.

Audio system, audio signal, low-frequency speakers, baffle plate, multi-channel, diaphragm

Description

SOUND REPRODUCTION METHOD AND SOUND REPRODUCTION SYSTEM}

BRIEF DESCRIPTION OF THE DRAWINGS The figure for demonstrating the speaker arrangement in one Embodiment of the sound reproduction system by this invention.

2 is a diagram used for explaining the operation of an embodiment of a sound reproduction system according to the present invention;

3 is a diagram used for explaining the operation of an embodiment of a sound reproduction system according to the present invention;

4 is a view for explaining an embodiment of a sound reproduction system according to the present invention;

FIG. 5 is a diagram for explaining the configuration of main parts of the embodiment of FIG. 4; FIG.

6 is a block diagram illustrating a configuration example of an audio signal processing apparatus according to the embodiment of FIG. 4.

7 is a view for explaining an embodiment of a sound reproduction system according to the present invention;

8 is a view for explaining another embodiment of the sound reproduction system according to the present invention;

9 is a block diagram illustrating a configuration example of an audio signal processing apparatus according to the embodiment of FIG. 8.

Fig. 10 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention.

Fig. 11 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention.

Fig. 12 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention.

Fig. 13 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention;

Fig. 14 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention.

Fig. 15 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention;

Fig. 16 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention.

Fig. 17 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention.

Fig. 18 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention.

Fig. 19 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention;

Fig. 20 is a diagram for explaining another speaker arrangement in one embodiment of the sound reproducing system according to the present invention;

21 is a diagram for explaining a general speaker arrangement example in the conventional sound reproduction system.

<Explanation of symbols for main parts of the drawings>

11FL: Speaker for front left channel

11FR: Speaker for front right channel

11C: Speaker for center channel

11RL: Speaker for rear left channel

11RL: Speaker for rear right channel

11SW1 ~ 11SW4: Speaker (subwoofer) for low range reproduction

20, 51, 67, 69: chair

22, 52, 531, 532, 54, 56, 571, 572, 58, 63, 65, 68: Speaker holder

30: voice signal processing device

 [Patent Document 1] Japanese Patent Application Laid-Open No. 5-95591

The present invention relates to a sound reproducing method and a sound reproducing system suitable for use in reproducing a multi-channel voice signal including a low frequency voice signal such as, for example, a 5.1 channel.

A video sound reproduction system called a home theater system is spreading. In the video sound reproducing system, for example, video reproduction from a DVD (Digital Versatile Disc) is displayed on a relatively large display, and sound reproduction is performed using a multi-channel method, and recently, a 5.1-channel method. Sound playback is possible.

The 5.1-channel sound reproduction system requires front, center, rear, and subwoofers, and four types of speakers. Subwoofers, which are dedicated low-frequency speakers, are in charge of monaural bands of 100Hz and below. Other speakers cover 100 Hz to 20 kHz.

The speaker arrangement in the conventional 5.1-channel sound reproduction system is as shown in FIG. That is, as shown in Fig. 21, the front left channel speaker 2FL is on the front left side of the listener 1, the front right channel speaker 2FR is on the right side, and the center channel speaker 2C is on the front side. Each is arranged.

Further, the rear left channel speaker 2RL is disposed on the left side of the rear of the listener 1 and the rear right channel speaker 2RR is disposed on the right side, respectively. In addition, a subwoofer speaker 2SW for a low frequency effect (LFE) channel (low frequency only) is disposed at an appropriate position.

These six speakers 2FL, 2FR, 2C, 2RL, 2RR, 2SW are each attached to a speaker box and placed at each position. Normally, the front and rear six speakers are often arranged such that the distance ds from the listener 1 is, for example, about 2 meters.

In the conventional sound reproducing system, for example, a speaker for L and R, in which a speaker box of about 15 liters is used, is replaced with a small box around 1 liter and is also called a satellite speaker. Of course, the low range doesn't come out, so a low-end speaker called a subwoofer has been added to support it. In this case, when a speaker other than the subwoofer is used as a small box, the crossover frequency of the audio signal supplied to the subwoofer (2SW) is 150 Hz, which is often slightly higher than the above 100 Hz. Is unchanged.

With the speaker system of such an arrangement, when reproducing a 5.1-channel audio signal from a DVD, it is natural that a sufficient bass sound is reproduced. In addition, since the channel is provided specifically for the low-side dedicated playback side, the bass is so loud that it is unprecedented in a source such as a movie, and a powerful presence can be obtained.

 By the way, in general, the sound of the high range is easy to block, and it is possible to attenuate a considerable sound by a wall or a door. However, in the case of a low range sound such as 100 Hz or less, which is the object of reproduction in a subwoofer, the sound blocking is not simple, and in a small house, the room is not large enough to block the low frequency sound. In addition, in a typical 5.1-channel speaker configuration, a volume of about 90 dB or more is required in order to reproduce a powerful sound in watching a video sound of a DVD. At this time, in particular, the bass, such as 50 Hz and 40 Hz, which are in charge of the subwoofer, is resonated and the sound propagates in a considerable range.

For this reason, when the sound is reproduced from the subwoofer, the sound may reach the upper and lower chambers as well as the next room, which may cause trouble. In particular, low-band sound is more difficult to block, and subwoofers are a big problem in housing in urban areas, and there is a phenomenon in which even a 5.1 channel sound reproduction system cannot be used sufficiently.

In order to solve this problem, Patent Literature 1 discloses that the midrange sound reproduces sound with a small speaker (a type in which the speaker unit is housed in a speaker box), and the low range reproduces sound in the vicinity of the ear of the listener, a headphone or bone conduction channel for the low end. A reproduction system has been proposed.

According to the technique of this patent document 1, since a bass sound is reproduced sound in the vicinity of the ear of a listener by a headphone or a bone conduction path, even if it is heard by a loud volume to a listener, it cannot be transmitted to a neighboring house.

However, in the invention of Patent Document 1, even when the low-end sound is reproduced in the vicinity of the ear, it is not a speaker but a vibrating body using headphones and bone conduction. With vibrators other than speakers, there is individual difference in achieving low bass equal to speakers, but it is not considered pure enough to be generally accepted. Another problem is that the listener has to wear headphones or a bone conduction headset.

SUMMARY OF THE INVENTION In view of the above, the present invention provides a sound reproducing method and a sound reproducing system that can reduce the propagation of low-level sound to a neighboring house, even if the low-level sound is reproduced using a speaker and also reproduced at a high volume. It aims to do it.

The present invention to solve the above problems,

A low frequency speaker unit which receives audio signals of a low frequency channel among a plurality of channels and reproduces low frequency sound;

And a holding means for holding the low frequency speaker unit so that the sound coming from the front and rear of the diaphragm of the low frequency speaker unit can be added near the ear of the listener without being attached to the baffle plate. Provide a system.

In the present invention, since the low-frequency speaker unit is configured to be held near the listener's ear, the low-frequency speaker unit can be made to be heard at a loud volume to the listener.

And since the low frequency speaker unit is not attached to the baffle plate, the sound of the low frequency sound reproduced is sound-proofed from before and after the diaphragm of the low frequency speaker unit. Since the sound coming from the front and rear of the diaphragm of the speaker unit is in the opposite phase (inverse phase), they cancel each other out and attenuate. In particular, the lower the frequency, the greater the attenuation, and the low frequency sound propagated to the neighboring house is significantly reduced.

DESCRIPTION OF EMBODIMENTS An embodiment of the sound reproducing system according to the present invention will be described below with reference to the drawings as an example of the case of reproducing the above-mentioned 5.1-channel multi-channel audio signal.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the speaker arrangement in embodiment of the sound reproduction system which concerns on this invention.

As shown in FIG. 1, the front left channel speaker 11FL is on the front left side of the listener 1, the front right channel speaker 11FR is on the right side as shown in the example of FIG. The center channel speaker 11C is disposed in each.

These speakers 11FL, 11FR, and 11C are the baffle plates in this example, for example, with the front side of the small speaker boxes 12FL, 12FR, and 12C of about 1 liter, and the speaker units 13FL, 13FR, and 13C) is attached. These speakers 11FL, 11FR and 11C are referred to hereinafter as front speakers when it is not necessary to distinguish which channel they are.

Further, the rear left channel speaker 11RL is disposed on the left side of the rear of the listener 1 and the rear right channel speaker 11RR is disposed on the right side, respectively. When these speakers 11RL and 11RR need not distinguish left and right, they are called a rear speaker hereafter.

These speakers 11RL and 11RR use baffle plates as the front side of the speaker boxes 12RL and 12RR which are smaller than the speakers 11FL, 11FR and 11C in this example. It consists of an attached one.

Therefore, the three speakers 11FL, 11FR, 11C for the front channel and the two speakers 11RL, 11RR for the rear channel may have a configuration and arrangement as in the prior art. In this embodiment, the configuration of the subwoofer is significantly different from the conventional example.

That is, in this embodiment, two subwoofers 11SW1 and 11SW2 are arrange | positioned between the head part of the listener 1 so that the diaphragm may oppose each ear in the vicinity of the left and right ear of the listener 1. The two subwoofers 11SW1 and 11SW2 are not in contact with the head or ears of the listener 1. These two subwoofers 11SW1 and 11SW2 are not housed in the speaker box nor attached to the baffle plate so that sounds radiated from the front and rear of the diaphragm of the speaker unit can be mixed.

The low-frequency signals of the LFE channel are commonly supplied to the two subwoofers 11SW1 and 11SW2, and the low-frequency sound of the LFE channel is soundproofed in phase from these subwoofers 11SW1 and 11SW2.

As a result, since the low frequency sound of the LFE channel is sound-proofed in the vicinity of both ears of the listener 1, the listener 1 is listened at a high volume, but the subwoofers 11SW1 and 11SW2 are located at a position away from the listener 1. Since the sound coming from the front and rear of the diaphragm of the speaker unit of 180) is mutually different from each other by 180 degrees, they are almost canceled out. As a result, it is possible to prevent the situation that low-frequency sound propagates to neighboring houses and causes lungs as in the prior art.

In order to confirm the attenuation of the low range sound, the sound from the speaker unit 11SW having a diameter of 17 cm, for example, used for the subwoofer in the anechoic chamber as shown in FIG. When the sound was received by the microphone 12 at a position separated by d), and the frequency characteristic of the sound pressure level was measured, the result was as shown in FIG. In this case, the speaker unit 11SW is not stored in the box or attached to the baffle plate.

In the four frequency characteristic curves 21, 22, 23, and 24 in FIG. 3, the distance d between the speaker unit 11SW and the microphone 12 is d = 10 centimeters, d = 20 centimeters, and d = When 40 centimeters and d = 80 centimeters.

3 shows that when the speaker unit is not placed in the box, the sound of 1 kHz or less is considerably attenuated. In particular, the lower the sound, the larger the attenuation.

In this embodiment, the distance dsw between the two subwoofers 11SW1 and 11SW2 and the left and right ears of the listener 1 is not attenuated so much by the low-end sound of the listener 1. The distance transmitted, in this example, dsw = 20 centimeters.

For example, in the example of FIG. 21 explained as a conventional example, the distance between the subwoofer 2SW and the ears of the listener 1 is 2 meters, whereas in the embodiment of FIG. 1, the subwoofers 2SW1 and SW2 and the listener ( Since the distance with each ear of 1) was 20 centimeters, compared with the conventional example, the distance becomes 1/10 in the case of embodiment.

For this reason, in this embodiment, the energy required for the listener 1 to feel the same sound pressure is sufficient to be 1/100 in the case of the conventional example. In other words, in the conventional example, if an amplifier of 100W (watts) is required, the same sound pressure is felt even with an amplifier of 1W in this embodiment.

In this embodiment, if the spread of the sound is small only by the difference in the output of the audio signal supplied to the speaker, and the low sound, for example, about 20 Hz, 30 Hz, and 40 Hz, the sound is canceled in terms of phase, Almost no sound can be heard outside of the speaker unit. On the other hand, since the powerful sound effect included in the DVD software is obtained by recording a large energy in this low band, the soundproofing effect becomes larger.

With the above constitution, when only the low range sound is noticed and only the low range sound is attenuated, the effect is sufficiently obtained. However, in this embodiment, the soundproofing effect is obtained not only in the low range sound reproduced by the subwoofers 11SW1 and 11SW2 but also in the entire sound range.

In other words, other speakers other than the subwoofer can likewise reduce the distance to the ears of the listener 1, thereby making the radiation energy in all sound regions small and contributing to the sound insulation.

In particular, it is effective to arrange the rear speakers 11RL and 11RR near the return of the listener 1 adjacent to the subwoofers 11SW1 and 11SW2. Originally, since the rear speakers 11RL and 11RR are the main sound sources, the reverberation sound from the back of the listener 1 is included, and a small speaker is included on the left and right of the head rear of the listener 1 incorporating an insignificant point. Positioning and energy saving can be achieved by storing and placing a small speaker unit in a box.

In addition, the front speakers 11FL, 11FR, and 11C also need to be studied for their arrangement, but as a minimum value, for example, by approaching the center of the listener 1 near 50 centimeters, the volume of the total is lowered to the surroundings. The negative pollution can be reduced.

In the above example, the sound pressure of the subwoofers 11SW1 and 11SW2 decreases by 20 dB when the distance dsw between the subwoofers 11SW1 and 11SW2 and the ears of the listener 1 is 20 centimeters compared to the conventional 2 meters. . The same applies to the rear speakers 11RL and 11RR. Also, in relation to other front speakers 11FL, 11FR, and 11C, when the distance (df) between these speakers 11FL, 11FR, and 11C and the ear of the listener 1 approaches 2 centimeters to 50 centimeters, sound pressure is also 12 dB. Has the effect of lowering.

Considering the above, as a method of arranging all seven speakers without being separated too far from the ears of the listener 1, for example, a method of installing the speakers in a chair having a structure such as a massage chair can be considered.

Fig. 4 is an example of the case, and shows an embodiment of the sound reproducing system of the present invention, in which a structure in which seven speakers 11FL, 11FR, 11C, 11RL, 11RR, 11SW1, 11SW2 as described above are mounted on a chair. It is a figure which shows.

That is, in this example, for example, the chair 20 has a structure similar to a seat of a business class of an airplane, and the speaker holder 22 is attached to the top portion 21a of the back portion 21 of the chair 20, Subwoofers 11SW1 and 11SW2 and rear speakers 11RL and 11RR are attached to this speaker holder 22 and held therein.

5A and 5B are diagrams showing an example of the speaker holder 22. As shown in FIG. The speaker holder 22 is constituted by a pipe 221 made of metal such as aluminum, for example. As shown in FIG. 5B, the pipe 221 has a flat ring shape, and the subwoofers 11SW1 and 11SW2 and the rear speakers 11RL and 11RR are formed in a space formed by the ring. In addition, the auxiliary subwoofers 11SW3 and 11SW4 are fixed.

Since the subwoofers 11SW3 and 11SW4 for the auxiliary may feel that the auditory image and low range sound are insufficient in power only by the subwoofers 11SW1 and 11SW2 arranged next to the ear of the listener 1, the corresponding power shortage To supplement, these auxiliary subwoofers 11SW3 and 11SW4 are not essential.

The pipe 221 is configured in a flat ring shape, and the ring-shaped portion has a side (left and right ears and a side of the head except for the frontal direction of the face of the listener 1 as shown in Fig. 5A). It is composed of a substantially U shape so as to surround the rear side of the opposite side) and the head.

Attachment legs 222a and 222b for attaching to the backrest portion 21 of the chair 20 are connected to the ring-shaped pipe 221, and the chairs are provided by the attachment legs 222a and 222b. The backrest part 21 of 20 can be detachably attached, for example. That is, for example, a long hole (not shown) in which the attachment leg portions 222a and 222b are inserted and fitted is formed in the top portion 21a of the back portion 21 of the chair 20, and the attachment leg portion is formed. 222a, 222b is comprised so that attachment and fixation may be carried out by being inserted in the long hole of the said backrest part 21, and being fitted.

Subsequently, the subwoofers 11SW1 and 11SW2 are placed on the pipe 221 at positions opposite to the left and right ears of the listener 1 when the listener 1 sits on a chair of the U-shaped ring pipe 221. Stays fixed. In addition, rear speakers 11RL and 11RR in which the speaker unit is housed in the box are fixed to the pipe 221 on the rear side of each of the subwoofers 11SW1 and 11SW2. In addition, the auxiliary subwoofers 11SW3 and 11SW4 are fixed to the pipe 221 at the ring-shaped pipe position that becomes the rear of the head of the listener 1.

In this example, when the listener 1 sits on the chair 20, the distance between the subwoofers 11SW1 to 11SW4 and the rear speakers 11RL and 11RR and the head (especially the ear) of the listener 1 is in this example. It is configured to be about 20 centimeters.

In this embodiment, three front speakers 11FL, 11FR, and 11C are also attached to the chair 20. As shown in FIG.

That is, the front left channel speaker 11FL is attached to the front end of the attachment arm 24L detachably attached to the armrest portion 23L on the left side of the chair 20 in this example, for example. In this example, the armrest portion 23L is provided with a mounting portion (not shown) in which the attachment arm 24L is detachably mounted, and the attachment arm 24L having the speaker 11FL fixed to the tip end is attached thereto. It is attached to the chair 20 by attaching to the attaching part. In this case, the position of the speaker 11FL is configured to be such that it does not disturb the viewing of the image of the display screen of the listener 1.

Although not shown, the front right channel speaker 11FR is also fixedly attached to the distal end of the attachment arm, and the attachment arm is attached by being attached to the attachment arm attachment portion of the armrest portion on the right side of the chair 20.

In addition, although not shown, the center channel speaker 11C is also fixedly attached to the distal end of the attachment arm, and the attachment arm is attached by being attached to the attachment arm attachment portion that is attached to either of the left and right armrest portions. .

In this case, the attachment arm and its mounting portion are configured so that the positions of the speakers 11FL, 11FR, 11C after attachment are such that they do not interfere with viewing of the image on the display screen of the listener 1.

And the audio signal of the corresponding channel to each speaker 11FL, 11FR, 11C, 11RL, 11RR, 11SW1 to 11SW4 is a signal line from the voice signal processing device 30 provided in the lower part of the chair 20 in this example, respectively. Speaker cable). The audio signal processing device 30 receives a multi-channel audio signal from, for example, a DVD playback device, separates the audio signal of each channel, outputs and amplifies the separated audio signal of each channel, and Supply it to the speaker.

In this case, the audio signal processing device 30 may be configured to receive a signal from a source of a multi-channel audio signal, for example, a DVD playback device, via a signal cable, but then between the DVD playback device and the chair. It must be connected with a signal cable. In this embodiment, a DVD reproducing apparatus is provided with means for transmitting a multi-channel audio signal wirelessly using radio waves or light, and the multi-channel audio signal transmitted wirelessly to the voice signal processing apparatus 30. By providing a receiving unit for receiving the signal, a signal cable between the DVD player and the chair 20 is unnecessary.

6 is a block diagram showing a configuration example of an example of the audio signal processing apparatus 30 according to this embodiment. This example is a case where, for example, a multi-channel audio signal from a DVD player is sent by radio waves.

As shown in FIG. 6, the audio signal processing apparatus 30 of this example includes a radio receiver 31, a voice signal processor 32, and output amplifiers 33FR, 33FL, 33C, 33RL, 33RR, and 33LFE for each channel. ) Is configured.

The radio receiver 31 receives, for example, a multi-channel audio signal transmitted by radio waves from a DVD playback device, and supplies the received signal to the audio signal processor 32. The voice signal processor 32 separates the voice signal of each channel from the received signal and supplies the voice signal of each channel to the output amplifier of the corresponding channel.

In this case, the multi-channel audio signal sent from the DVD playback device is, for example, channel decoded by the DVD playback device so that the audio signals of each channel of the 5.1 channel are restored, and the audio signals of these 5.1 channels are time-division multiplexed, frequency multiplexed. In the multiplexing method, such as multiplexing, the speech signal processing unit 32 performs multiple decoding processing to separate the speech signal of each channel.

When the multi-channel audio signal sent from the DVD reproducing apparatus is a signal before channel decoding, the audio signal processing unit 32 performs channel decoding processing to extract the audio signal of each channel.

The separated and extracted voice signals of the respective channels are output through the output amplifiers 33FR, 33FL, 33C, 33RL, 33RR, and 33LFE for the respective channels, and the speakers 11FR, 11FL, 11C, 11RL, 11RR, 11 SW1 to SW4). In this case, the audio signal of the LFE channel is commonly supplied to the four speakers SW1 to SW4 through the output amplifier 33LFE.

In addition, the audio signal processing unit 32 may perform a delay process for the audio signal of each channel in consideration of the difference between the distance between the listener 1 and each speaker.

According to the sound reproducing system of the embodiment in which the multi-channel speaker is attached to the chair 20 shown in FIG. 5 as described above, the listener 1 sitting on the chair 20 has a large volume, and has a multi You can enjoy channel audio and greatly reduce the leakage of sound to the surroundings.

In particular, in this embodiment, by placing the subwoofer near the ear of the listener 1 without storing it in the box, leakage of the bass sound into the adjacent room can be greatly attenuated. In addition, as described above, speakers of channels other than the subwoofer channel are also arranged near the listener 1, so that the level of the audio signal supplied to the speakers of these channels can be lowered. The overall level of negative leakage to the surroundings can be lowered. Thus, for example, even a late night DVD viewing can be enjoyed at a sufficient volume level without worrying about others.

In addition, since the low-end sound speaker (subwoofer) is located near the listener's ear, the audio signal output power can be about 1/100 of the conventional case in extreme cases, and energy saving can be achieved. The cost of (output amplifier) can be greatly reduced. In addition, the voice output power is solved with a small power, so that the speaker can use a thin, light and inexpensive speaker that does not require a large stroke. In addition, as the voice output power is reduced, heat generation is reduced, and the device such as a power supply can be miniaturized, so that the battery can be driven and can be put into a design such as a chair.

In addition, as described above, the audio signal output from a multi-channel audio signal source such as a DVD playback device is transmitted by radio waves or light, so that the radio between the DVD playback device and the sound reproduction system becomes wireless, for example, a sound reproduction system. Chair 20 equipped with the advantage that it can move freely.

Accordingly, there is an advantage that a total energy saving of the sound reproduction system can be realized, and a sound reproduction system can be provided that reduces noise to the surroundings without lowering the satisfaction of the listener.

Even in a normal sound insulation window, even if there is a performance that can attenuate 45 dB at 5 kHz, it drops to 36 dB at 1 kHz and to 20 dB at 100 Hz. In addition, since the amount of attenuation becomes smaller at 50 Hz or less, the sound insulation effect of the subwoofer according to this embodiment is remarkable, and the cost-saving effect is very large considering that the sound-absorbing work of the room is enjoyed. .

In addition, in the above-described embodiment, since the subwoofer for sound reproduction in the low range is provided at a position facing the ears of the listener, the low frequency sound reaching the listener becomes high efficiency. However, the arrangement position of the subwoofer is not limited to such a position, and may be any position as long as it is on a spherical surface having a radius of dsw centered on the head of the listener 1, for example, as shown in FIG. do. However, as the arrangement position of the subwoofer, the space on the front side of the listener rather than the face of the listener 1 is not preferable, and as shown in FIG. 7, the space on the rear side of the listener 1 is preferable.

[Other Embodiment 1]

In the above-described embodiment, the front speaker is provided with a center channel speaker 11C in addition to the front left channel and front right channel, but the center channel speaker 11C is disposed in front of the listener 1. Therefore, there is a fear that the viewing of the image on the display screen may be disturbed.

Therefore, in this embodiment, as shown by the broken line in FIG. 8, without the center channel speaker 11C installed, the sound is virtually sounded by sound that is sounded from the front left channel speakers and the front right channel speakers 11FL and 11FR. Thus, the sound from the broken line position in FIG. 8, that is, the sound of the center channel is configured to be inspired by the listener 1. In the example of FIG. 8, the auxiliary subwoofers 11SW3 and 11SW4 are omitted.

9 is a block diagram showing an example of the configuration of the audio signal processing device 30 in the case of this embodiment. In the example of FIG. 9, since the center channel speaker 11C does not exist in the audio signal processing device 30, the output amplifier 33C of the audio signal of the center channel is not provided.

Instead of the voice signal processor 32 of FIG. 6, a voice signal processor 34 is provided. The voice signal processing section 34 processes the same up to the audio signal processing section 32 to separate or extract the audio signal of each channel. However, the voice signal component SC of the center channel is converted to the audio signal of the front left channel. The sound signal processing unit 32 differs from that of the audio signal SR in the SL and the front right channel at the same phase and same level.

That is, the signal SA supplied to the output amplifier 33FL and the signal SB supplied to the output amplifier 33FR in this embodiment are

SA = SL + αSC

SB = SR + αSC

Becomes However, 0≤α <1.

In this case, since the sound of the center channel is sound-insulated in phase and at the same level from the speakers 11FL and 11FR for the front left channel and the front right channel, the listener 1 as if there is a sound source at the broken line position in FIG. ) Is heard.

Therefore, according to this embodiment, even if the center channel speaker 11C is omitted, the center channel sound can be reproduced substantially, so that the front image is disturbed by the center channel speaker while listening to 5.1 channel multi-channel audio. You will be able to observe it without any trouble.

[Other Embodiment 2]

In the above-mentioned embodiment, not only the speakers for the low-frequency reproduction channel but also the speakers for other channels are attached to the chair. As in one embodiment, it may be attached to a chair so as to be arranged near the ear of the listener without being attached to the baffle plate.

In that case, it is also possible to have a configuration of a sound reproduction system including only speakers for low-frequency reproduction, and speakers of channels other than those for low-pass reproduction are separately prepared and appropriately arranged to constitute a multi-channel sound reproduction system. You can do that.

In addition, in the above-described embodiment, the speaker is attached to the chair so that the speaker for low pass reproduction is arranged near the ear of the listener. However, the configuration of placing the speaker near the ear of the listener is not limited to the structure attached to the chair. .

[Other holding configurations of subwoofer]

In the above-described embodiment, the speaker units of the subwoofers 11SW1 and 11SW2 are mounted on the speaker holder fixed to the chair without being housed in the speaker box and not attached to the baffle plate and mounted in a so-called bare state. The speaker holder does not have to be fixed to the chair.

10 and 11 are, for example, an example in which the speaker holders of the two subwoofers 11SW1 and 11SW2 made of aluminum pipes can be detachably attached to the chair 51 as in the above-described embodiment. .

In the example of FIG. 10, the two subwoofers 11SW1 and 11SW2 are attached to both sides of the T-shaped attachment arm 52a of the speaker holder 52. The two subwoofers 11SW1 and SW2 are attached to the speaker holder 52 in a state where the vibration surfaces thereof face each other and are separated by a predetermined distance.

Also in this example, the distance between the vibrating surface of the subwoofer 11SW1 and the vibrating surface of the subwoofer 11SW2 is determined by the listener 1 when the head of the listener 1 is inserted between the two subwoofers 11SW1 and 11SW2. ) And the distance between each of the two subwoofers 11SW1 and 11SW2 are set to a distance dsw as described in FIG.

The center arm 52b of the T-shaped attachment arm 52a of the speaker holder 52 is inserted into the speaker holder mounting hole 51a provided in the chair 51 in this example, so that the speaker to the chair 51 is mounted. It becomes a part for attaching the holder 52.

The speaker holder mounting hole 51a of the chair 51 is formed in the center part of the shoulder width direction at the time of the listener 1 when the back part of the chair 51 sat.

In the example of FIG. 10, when the listener 1 listens to music using the subwoofers 11SW1 and 11SW2, the listener arm of the chair 51 mounts the center arm 52b of the speaker holder 52. The subwoofers 11SW1 and 11SW2 are mounted on the chair 51 by being inserted into the holes 51a.

In the example of FIG. 10, when the listener 1 is seated on the chair 51, the subwoofers 11SW1 and 11SW2 are disposed at a position separated by a predetermined distance dsw with respect to both ears near their ears. The sound is reproduced at a sufficient volume in the listener 1 even at a small volume, and the sound is low in the surroundings.

In the example of FIG. 11, each of the subwoofers 11SW1 and 11SW2 is attached to the speaker holder 531 and the speaker holder 532. On the other hand, a speaker holder fitting hole 51b for inserting and fitting the speaker holder 531 into one end portion of the back of the chair 51 in the shoulder width direction when the listener 1 is seated is formed. The speaker holder fitting hole 51c which inserts and fits the speaker holder 532 is formed in the other end part of the shoulder width direction at the time of the listener 1 when the back part of the chair 51 sits.

In the example of FIG. 11, when the listener 1 listens to music using the subwoofers 11SW1 and 11SW2, the speaker holder 531 is inserted into the speaker holder mounting hole 51b of the chair 51. In addition to the mounting, the speaker holder 532 is inserted into the speaker holder mounting hole 51c of the chair 51 so that the subwoofers 11SW1 and 11SW2 are mounted on the chair 51.

The distance between the vibration surface of the subwoofer 11SW1 and the vibration surface of the subwoofer 11SW2 when the speaker holders 531 and 532 are attached to the chair 51 is determined by the two subwoofers 11SW1 and 11SW2. When the head of the listener 1 is inserted in between, the distance between the ears of the listener 1 and each of the two subwoofers 11SW1 and 11SW2 is such that the distance dsw as described in FIG. It is.

Therefore, also in the example of FIG. 11, when the listener 1 sits in the chair 51, the subwoofers 11SW1 and 11SW2 are arrange | positioned in the position which is separated by the predetermined distance dsw with respect to the both ears near one's ear. The low range audio is reproduced at a sufficient volume in the listener 1 even at a small volume, and becomes low noise to the surroundings.

In the case of the example of FIG. 10 and FIG. 11, when using the normal chair 51, since the speaker holder 52 and the speaker holders 531, 532 can be attached and detached from the chair 51, the subwoofer It does not interfere with 11SW1 and 11SW2, and usability is good.

The two subwoofers 11SW1 and 11SW2 are not limited to the configuration to be attached to the chair as shown in the above example.

In the example of FIG. 12, the speaker holder 54 with two subwoofers 11SW1 and 11SW2 facing each other with the same distance as the example of FIG. 10 or 11 is attached to the ceiling by the suspension member 55. This is an example suspended from.

In the case of the example of FIG. 12, although the suspension member 55 is abbreviate | omitted illustration, the length from the ceiling is adjustable, for example, as shown in FIG. 12 by the said length adjustment, the chair 51 The subwoofers 11SW1 and 11SW2 are arranged in the vicinity of both ears of the listener 1 sitting at the position 1) by a predetermined distance dsw with respect to the ears.

In addition, the example of FIG. 13 is a case where two subwoofers 11SW1 and 11SW2 are comprised in the stand type | mold with the speaker holder 56 attached so that the two subwoofers 11SW1 and 11SW2 may face the same distance as the example of FIG.

In the example of FIG. 14, the speaker holder is formed in the stand type similarly to the example of FIG. 13, but in the case of the example of FIG. 14, each of the two subwoofers 11SW1 and 11SW2 is an independent stand type speaker holder. It is a case where it is attached to each of the spheres 571 and 572, and is comprised.

Therefore, in the case of the example of FIG. 13, when the speaker holder 56 is provided at a predetermined position with respect to the listener 1, the two subwoofers 11SW1 and 11SW2 are similar to the above-described examples of FIGS. 10 and 11. Are correctly placed.

However, in the case of the example of Fig. 14, since the speaker holders 571 and 572 are completely separate and independent, each of the stand type speaker holders 571 and 572 is arranged so that the listener 1 is disposed at an appropriate position.

The example of FIG. 15 is a case in which two subwoofers 11SW1 and 11SW2 are configured such that the speaker holders 58 facing each other with the same distance as the example of FIG. 10 or 11 are attached to the wall 59. .

In the case of this example of FIG. 15, as in the example of FIG. 13, the distance between the two subwoofers 11SW1 and 11SW2 is fixed by the speaker holder 58, so that the listener 1 has its own head portion. What is necessary is just to put it in the center of subwoofer 11SW1 and 11SW2.

The example of FIG. 16 is another example of the example which mounts a speaker holding part detachably with respect to a chair. In the example of FIG. 16, the iron plate 62 is embedded in the back side of the back portion 61 of the chair 51.

On the other hand, the magnet part 64 is attached to the speaker holder 63 to which the two subwoofers 11SW1 and 11SW2 face each other with the same distance as in the example of FIG. 10 or 11, for example, by screwing or the like. It is. The speaker holder 63 fixes the magnet portion 64 by the magnetic attraction force to the iron plate 62 of the back portion 61 of the chair 51 to be fixed to the back portion 61 of the chair 51. do.

Also in this example of FIG. 16, the listener 1 may sit on the chair 61 and place its head at the center of the two subwoofers 11SW1 and 11SW2.

The above is an arrangement example of the subwoofer with respect to one listener 1, but the present invention can be applied even when a plurality of people enjoy listening to music at the same time. 17-20 is a figure for demonstrating the example of arrangement | positioning with respect to the said plurality of listeners of the subwoofer when such a plurality of people enjoy a music simultaneously.

17 and 18 show an example of an acoustic reproduction system in which two subwoofers 1A and 1B are arranged in the vicinity of an ear of each listener, which is an application example of the example of FIG. .

In the example of FIG. 17, two subwoofers 11SW1A and 11SW2A for the listener 1A are attached to the speaker holder 65 made of, for example, aluminum pipe, and two subwoofers for the listener 1B ( 11SW1B, 11SW2B) are attached.

The speaker holder 65 is attracted to the back plate portion of the bench 67 shown in FIG. 18A by magnetic attraction force with respect to the iron plate (not shown) embedded in the same manner as in the example of FIG. 16. The magnet part 66 (refer FIG. 17) to be attached is attached, for example by screwing.

The arrangement relationship of the listeners 1A of the two subwoofers 11SW1A and 11SW2A and the arrangement relationship of the listeners 1B of the two subwoofers 11SW1B and 11SW2B are, of course, similar to those of the above-described examples. However, the diaphragm of the subwoofer 11SW2A and the subwoofer 11SW2B does not oppose the diaphragm of the subwoofer 11SW1A and the subwoofer 11SW1B in this example, as shown in FIG. It is arrange | positioned so that sound may be sound-proofed in the back of 1A and listener 1B.

That is, the subwoofer 11SW2A and the subwoofer 11SW2B have the radial direction of the sound waves from these diaphragms becoming the direction orthogonal to the radial direction of the sound waves from the diaphragms of the other two subwoofers 11SW1A and 11SW1B. have.

For this reason, when the position of the subwoofer 11SW2A and the subwoofer 11SW2B assumes the line of the direction orthogonal to the said diaphragm from the center position of the said diaphragm, the position of the line becomes a position which opposes the ear of a listener. In addition, the distance between the listener's ear and the line becomes the distance dsw.

Therefore, in the state where the two listeners 1A and 1B are sitting on the bench 67, as shown in FIG. 18A, the low frequency reproduction sound is generated by the two subwoofers 11SW1A and 11SW2A for the listener 1A. The low frequency reproduction sound is provided by the two subwoofers 11SW1B and 11SW2B for the listener 1B.

In this case, for the left and right ears of the listener 1A, the sound signal for the subwoofer is transmitted so that sound waves from the diaphragms (front side of the speaker unit of the subwoofer) of the two subwoofers 11SW1A and 11SW2A arrive in phase. Inputs are made to two subwoofers 11SW1A and 11SW2A. Similarly, for the left and right ears of the listener 1B, two audio signals of the subwoofer are transmitted so that sound waves from the diaphragms (front side of the speaker unit of the subwoofer) of the two subwoofers 11SW1B and 11SW2B arrive in phase. Inputs are made to the subwoofers 11SW1A and 11SW2A (see FIG. 18B). In FIG. 18, the display of "+" and "-" shows the phase of a sound wave, and "+" and "-" show a sound wave to reverse phase.

In FIG. 18B, the low-frequency sound waves provided from the two subwoofers are also in phase between the listener 1A and the listener 1B, but as shown in FIG. 18C, the listener ( When the distance between 1A) and the listener 1B is relatively apart, the low-frequency sound waves provided from the two subwoofers can be reversed between the listener 1A and the listener 1B.

As shown in Fig. 19A, the two subwoofers 11SW1A and 11SW2A for the listener 1A are provided so that the diaphragms face each other, and the heads of the listener 1A are interposed therebetween. Similarly, the two subwoofers 11SW1B and 11SW2B used for the listener 1B may be disposed so that these diaphragms face each other and disposed so as to sandwich the head of the listener 1A.

In the example of FIG. 19A, the subwoofer 11SW2A for the listener 1A and the subwoofer 11SW2B for the listener 1B are provided between the listener 1A and the listener 1B. Sound waves coming out of the rear of the speaker unit on the opposite side to the diaphragm are preferably configured to cancel each other out. Thus, in the example of FIG. 19A, the sound waves from the two subwoofers 11SW1A and 11SW2A for the listener 1A, as shown in FIG. 19A in the listener 1A and the listener 1B, respectively. And the audio signal for each subwoofer is supplied to the subwoofer for each listener so that sound waves from the two subwoofers 11SW1B and 11SW2B for listener 1 are reversed.

As shown in FIG. 19B, a subwoofer provided between the listener 1A and the listener 1B is provided, and one subwoofer 11SW5 common to the listener 1A and the listener 1B is provided. You may do so. In the case of this example of FIG. 19B, the distance between the listener 1A and the listener 1B is close.

As shown in FIG. 19B, the common subwoofer 11SW5 is provided at the rear of the center position between the listener 1A and the listener 1B. When the position of this common subwoofer 11SW5 assumes the line of the direction orthogonal to the said diaphragm at the center position of the said diaphragm, the position of the line becomes a position which opposes the ear of listeners 1A and 1B, Further, each of the distances between the ears of the listeners 1A and 1B and the corresponding line becomes the distance dsw.

And the common subwoofer 11SW5 is arrange | positioned so that the radial direction of the sound wave from the diaphragm may become a direction orthogonal to the radial direction of the sound wave from the diaphragm of the other subwoofers 11SW1A and 11SW1B.

Therefore, in the case of this example of FIG. 19B, the arrangement relationship between the subwoofer 11SW1A and the subwoofer 11SW5 with respect to the listener 1A, and the subwoofer 11SW1B and the subwoofer 11SW5 with respect to the listener 1B. ) And the arrangement relationship of the subwoofer 11SW1 and the subwoofer 11SW2 with respect to the listener 1 in the above-described example, for example in FIG. 10.

In this example, as shown in Fig. 19B, sound waves from the diaphragm (front side of the speaker unit of the subwoofer) of the three subwoofers 11SW1A, 11SW2A, and 11SW5 are the listeners 1A, 1B. The audio signal for the subwoofer is input to these three subwoofers 11SW1A and 11SW2A so as to reach in-phase to the ear.

Next, the example of FIG. 20 shows an example of an acoustic reproduction system in which the subwoofers are arranged near the ears of each listener for three listeners 1A, 1B, and 1C. It is an application example of the example of 19 (B).

In the example of FIG. 20, four subwoofers 11SWa, 11SWb, 11SWc, and 11SWd are attached to the speaker holder 68 similarly to the example of FIG. In the speaker holder 68, magnetic suction force is applied to the iron plate (not shown) embedded in the back plate portion of the bench 69 shown in FIG. 20A as in the example of FIG. The magnet part (not shown) which adsorb | sucks is attached.

In this example, the two subwoofers for the listener 1A are subwoofers 11SWa and 11SWb, the two subwoofers for the listener 1B are subwoofers 11SWb and 11SWc, and the listener 1C is connected to the listener 1C. The two subwoofers are subwoofers 11SWc and 11SWd.

That is, the subwoofer 11SWb is shared by the listener 1A and the listener 1B, and is provided at the rear of the center position between the listener 1A and the listener 1B. The subwoofer 11SWc is commonly used by the listener 1B and the listener 1C, and is provided at the rear of the center position between the listener 1B and the listener 1C.

And these common subwoofers 11SWb and 11SWc are arrange | positioned so that the radiation direction of the sound wave from the diaphragm may become a direction orthogonal to the radiation direction of the sound wave from the diaphragm of the other subwoofers 11SWa and 11SWd.

The arrangement relationship between the two subwoofers for each of the listeners 1A, 1B, and 1C, and the listeners 1A, 1B, and 1C is the same as in the example of FIG. 19B.

In this example, sound waves from the diaphragm (front side of the speaker unit of the subwoofer) of the four subwoofers 11SWa, 11SWb, 11SWc, and 11SWd, as shown in FIG. Audio signals for the subwoofers are input to these four subwoofers 11SWa, 11SWb, 11SWc, and 11SWd so as to reach the ears of 1B and 1C in phase.

That is, the subwoofer 11SW2A and the subwoofer 11SW2B have the radial direction of the sound waves from these diaphragms becoming the direction orthogonal to the radial direction of the sound waves of the diaphragm of the other two subwoofers 11SW1A and 11SW1B. .

In the sound reproducing system in the case of the plurality of listeners shown in Figs. 18 to 20, the speaker holder is mounted on the chair using a magnet, but for example, a type suspended from the ceiling as in the example of Fig. 12, Fig. Of course, other configurations such as the type to be held using the stand as shown in the example of FIG. 13 or FIG. 14 and the type to fix the speaker holder to the wall can be taken.

In addition, in the examples of Figs. 10 to 20, only the attachment of the subwoofer has been described. However, the rear speaker or the like can also be attached to the speaker holder of each example as in the above-described embodiment, if necessary.

 [Other Embodiments or Modifications]

In addition, the method of attaching the speaker unit for low-frequency reproduction so that sound coming from the front and rear of the diaphragm can be added to it is not limited to the structure which attaches to the pipe like embodiment mentioned above, For example, a comparatively large number of holes The perforated plate may be provided with a speaker unit for low pass reproduction, and the sound from the front and rear of the diaphragm may be added through these many holes.

In addition, although the above description has been given of the case of a system for reproducing a 5.1-channel multichannel audio signal, the present invention is not limited to the 5.1 channel, and reproduces a plurality of channels of audio signals in addition to the low-frequency audio channel. Applicable to all sound reproduction systems.

According to the present invention, the sound reproduction of the low range sound can also be reduced by the use of a speaker and the reproduction of the low range sound to the neighboring house or the like even when reproducing at a high volume.

Claims (8)

A low frequency speaker unit which receives audio signals of a low frequency channel among a plurality of channels and reproduces low frequency sound; Holding means for arranging and holding the low frequency speaker unit near the ear of the listener without attaching it to the baffle plate so that sound coming from the front and rear of the diaphragm of the low frequency speaker unit can be added; Sound reproducing system comprising a. The method of claim 1, And the low pass speaker unit is attached to a chair on which the listener sits by the holding means. The method of claim 1, And the low pass speaker unit is arranged in the space range behind the face of the listener by the holding means. The method of claim 1, The low-frequency speaker unit is provided with at least two opposed to the left and right ears of the listener. The method of claim 1, Further comprising a speaker for a rear channel voice signal, And the speaker for the audio signal of the rear channel in the plurality of channels is also held by the holding means. A sound reproducing system for reproducing a plurality of channels of audio signals including a low-pass channel using a plurality of speakers, Audio signal processing means for outputting audio signals of a plurality of channels including the low pass channel to the plurality of speakers; A plurality of speakers having a speaker unit attached to the baffle plate for receiving audio signals of a plurality of channels other than the low pass channel from the voice signal processing means, respectively; A low pass speaker, the speaker unit receiving a voice signal of the low pass channel from the sound signal processing means, which is not attached to the baffle plate so as to be able to add sound coming from front and rear of the diaphragm, to be placed near the listener's ear. Sound reproducing system comprising a. The method of claim 6, And at least the low pass speaker is attached to a chair in which the listener sits. A sound reproduction method for reproducing a plurality of channels of audio signals including a low-pass channel using a plurality of speakers, Audio signals of a plurality of channels other than the low pass channel are to be reproduced by the speaker unit by a plurality of speakers attached to the baffle plate, respectively. The voice signal of the low pass channel is configured to cause the speaker unit to reproduce sound by a low pass speaker which is maintained to be placed near the ear of the listener without being attached to the baffle plate so as to add sound coming from front and rear of the diaphragm. How to play sound.

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