JPH0514993A - Speaker system for background sound field - Google Patents

Abstract

PURPOSE:To improve the sound effect by installing a speaker system for one channel whose connection is reversed in the polarity to a position at either of both sides of a listener or a position in an oblique rear direction in a way that a mount face of the speaker unit is not facing the listener. CONSTITUTION:When a signal enters speaker systems 11, 12 from amplifiers 13, 14, sound waves 11b, 12b radiate in rear directions and reach a side wall and a ceiling, in which the waves are reflected thereby forming a wide sound field. On the other hand, the sound waves radiating directly from the equipments 11, 12 are cancelled because the polarity of the waves is opposite to each other and the listener 18 does not recognize a direct radiation sound. Through the constitution above, the reproduction of the signal of the rear channel without presence is attained inexpensively and the effective sound is reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device for a background sound field of a home AV system.

[0002]

2. Description of the Related Art In recent years, the improvement of video image technology has made it possible to show movies on a large screen at home. Accompanied by this, sound devices have also been required to have the power and sound quality suitable for a large screen. From such a background, the sound reproducing device as shown in FIG. 6 has been provided. The sound reproducing device combined with the home video reproducing device 19 is arranged in front of the viewer 18.
~ 3 speaker devices 15, 16 and 17 and two or more speaker devices 61 and 6 laterally or rearward
It is often a so-called surround sound field reproducing device using 2. The front channel of this surround sound field reproduction device is used to reproduce the signals such as voice and background music of the software to be reproduced, and the rear channel is used to synthesize the front signal using a special processing device such as indirect sound or reverberation sound. It reproduces a signal.

Since the rear channel reproduces an indirect sound and a reverberant sound, it is preferable to install a speaker system so that the sound from a specific speaker device does not reach the viewer directly and the sound image is not localized. Desirable in terms. Therefore, for example, as shown in FIG. 6, a large number of general speaker devices 61 (62) each having a speaker unit 61a (62a) attached to one baffle surface for rear use are used, and the speaker unit attachment surface is directed to a viewer. It is conceivable that the sound source may be dispersed by surrounding the viewer to take the above-mentioned effect. However, it is not feasible because it is required to obtain the maximum effect with a small number of rear speaker systems as much as possible from the viewpoint of installation location problems and costs.

Recently, in order to realize the above effect with two speakers, speaker devices having bidirectionality have been provided. It is a speaker device in which speaker units having the same characteristics are attached to both of one baffle plate and a baffle plate facing each other in a cabinet, and both speaker units are electrically connected so as to operate in opposite phases. That is, when the diaphragm of the speaker unit attached to one of the baffle plates moves in a direction protruding from the baffle plate, the diaphragm of the speaker unit attached to the other baffle plate opposite to each other moves in the direction of sinking from the baffle plate. That is why. This speaker device exhibits a dipole directivity characteristic in which the sound pressure is maximized in front of each speaker unit and the sound pressure is minimized at a position equidistant from each speaker unit, that is, at the side of the cabinet. When the speaker device is used as a rear speaker device of a sound reproducing device combined with a home video reproducing device by being arranged on both sides of a listener, the speaker system has a dipole directional characteristic, so that it is rearward near the listening position. The sound pressure of the direct sound from the speaker device for the speaker is minimized, and only the indirect sound reflected by the wall of the viewing room reaches the viewer, and it is possible to give the viewer a good surround effect while using a small number. .

[0005]

However, according to the above-mentioned structure, the phenomenon that appears uniquely in the dipole type speaker device, that is, the equivalent distance between the front and rear speaker units and 1
In the low frequency band equal to or lower than the frequency fc where the lengths of half the wavelengths are equal, there is a demerit that the sound pressures on the front surface and the back surface of the speaker cancel each other to cause a sharp decrease in the sound pressure level. In order to reduce fc, the equivalent distance between the speaker units may be made sufficiently long, but this is not realistic because of the size limitation of the speaker.

In order to solve such a problem, it is necessary to specially devise a filter circuit, a cabinet or the like to prevent a sudden decrease in sound pressure, which causes a problem of high cost. Furthermore, the speaker unit must be attached to the front and rear baffle surfaces, which is a major factor that cannot reduce the cost.

The present invention solves the above-mentioned conventional problems, does not increase the cost, and is a general speaker apparatus that does not use any special means, and the sound from a specific speaker apparatus reaches the viewer directly. There is no such thing as sound image localization,
An object of the present invention is to provide a speaker device for a background sound field capable of enhancing a good surround effect.

[0008]

To achieve this object, a background sound field speaker device of the present invention is a left channel in which a speaker unit of the same performance is attached to one baffle surface of a cabinet or two opposite surfaces. Alternatively, a speaker device for the right channel and a speaker device for the other channel in which only the speaker device is reversely connected to the speaker unit are provided on the both sides of the viewer or diagonally rearward. The speaker unit is installed by an installation means such as a speaker stand so that the mounting surface of the speaker unit does not face the direction of the viewer.

[0009]

According to the present invention, since the polarities of the left and right speaker devices for the rear channels are opposite to each other by the above-described structure, the direct radiation sounds cancel each other out in the vicinity of the center where the viewer is present, and the sound pressure is minimized. On the other hand, the sound pressure is maximum in front of the speaker unit. Therefore, the viewer hears the sound waves radiated from the left and right speaker units reflected on the walls and ceiling, and the sound of the rear channel is not localized to the viewer, and the sound field greatly expands, which is effective. You can play a surround sound field.

Further, since the left and right speaker devices are installed at a distance from each other, the frequency at which significant cancellation occurs in the low range is sufficiently low. Therefore, since no special device is required to secure the reproduction limit frequency in the low frequency range, when looking at the speaker device of one channel, the speaker device is the same as a general speaker device and the cost does not increase.

Further, when the space for reproducing the sound field is small and a speaker device having a speaker unit mounted on only one surface is sufficient, the cost can be greatly reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a connection diagram of a rear channel amplifier section and a speaker device for background sound field in a first embodiment of the present invention, and FIG. 2 is a speaker device of an entire AV system using the speaker device of the present invention. It is an installation example figure. In FIG. 1, reference numeral 11 is a speaker device for reproducing the background sound field of the left channel, which is connected to the amplification unit 13 for the rear left channel signal. Reference numeral 12 denotes the same speaker device for the right channel, which is connected to the rear right channel signal amplification unit 14, but has an electric polarity opposite to that of the speaker device 11. When viewing only one channel, those speaker devices are no different from general speaker devices. Further, in FIG. 2, the speaker devices 11 and 12 are
The speaker units 11a and 12a are installed in both lateral directions of the viewer so that the surfaces on which the speaker units 11a and 12a are attached face backward.

The operation when the background sound field speaker device of the present embodiment configured as described above is arranged as in the AV system shown in FIG. 2 will be described. Speaker device 1
When the signals from the amplifiers 13 and 14 enter the antennas 1 and 12, the sound waves 11b and 12b are emitted backward from the speaker devices 11 and 12, reach the side walls, the rear wall, and the ceiling, and are reflected to form a wide sound field. To do. On the other hand, in the vicinity of the center where the viewer 18 is located, the sound waves directly emitted from the speaker devices 11 and 12 have opposite polarities and thus cancel each other out. for that reason,
The radiated sound is not directly recognized by the viewer, and only the reflected sound is heard. In addition, since the distance between the speaker devices 11 and 12 is wide, the frequency at which significant cancellation begins is sufficiently low. Therefore, no special device is required to secure the reproduction limit frequency in the low frequency range.

As described above, according to the present embodiment, two general speaker devices are used for each of the right and left channels, and the electric polarity of one speaker device is reversely connected, so that both sides of the viewer are connected. By installing in the direction or at the rear side, it is possible to reproduce the signal of the rear channel, which is very inexpensive and has no localization, and to perform effective surround reproduction.

FIG. 3 is a connection diagram of a rear channel amplifier section and a background sound field speaker apparatus according to a second embodiment of the present invention. In the figure, 21 is a rear left channel speaker device and 22 is a right channel speaker device. In the speaker device, the back surfaces of the individual speaker devices 21a and 22a having the same performance are fastened with a fastening device A. It is a thing. Individual speaker devices 21a and 22a
Are connected in parallel to the rear channel signal amplifiers 13 and 14. However, the electrical connection between the two sets of speaker devices 21 and 22 is reverse connection.

FIG. 4 is a connection diagram of a rear channel amplifier section and a background sound field speaker apparatus according to a third embodiment of the present invention. In the figure, 31 is a rear left channel speaker device, 32 is a right channel speaker device, and speaker units 31a and 32a having the same performance are attached to two facing surfaces of a cabinet of the speaker device. The speaker units 31a and 32a are connected in parallel to the rear channel signal amplifiers 13 and 14. However, the speaker devices 31 and 32 are electrically connected in reverse.

The operation when the background sound field speaker devices of the second and third embodiments configured as described above are arranged as in the AV system shown in FIG. 5 will be described. The amplifiers 13, 1 are installed in the speaker devices 21, 22 or 31, 32.
When the signal from the speaker unit 4 enters, the sound waves from the speaker devices 21, 22 or 31, 32 are radiated to the front and the rear of the speaker unit, reach the side wall, the rear wall, the ceiling, and are reflected to the first. A wider sound field is formed than that in the above embodiment. On the other hand, near the center where the viewer 18 is located,
Since the sound waves directly emitted from the speaker devices 21, 22 or 31, 32 have opposite polarities, they cancel each other out. Therefore, the viewer does not directly recognize the emitted sound and hears only the reflected sound. In addition, the speaker device 21,
Since the distance between 22 or 31, 32 is wide, the frequency at which significant cancellation begins is sufficiently low. Therefore,
No special device is required to secure the reproduction limit frequency in the low frequency range.

As described above, according to the present embodiment, two speaker devices having speaker units of the same performance are attached to two facing surfaces, and two speaker devices are used for each of the right and left channels. By reversely connecting the target polarities and installing the speaker device on both sides of the viewer or at the rear, it is possible to reproduce the signal of the rear channel without a sense of localization without much cost, which is effective. Surround playback can be performed. In addition, since a wide sound field is formed in the front and rear of the speaker device even in a wider space, a sufficient surround effect can be obtained with one left and right speaker device.

[0020]

As described above, according to the present invention, the speaker device for the left channel or the right channel in which the speaker units having the same performance are attached to the one baffle surface of the cabinet or the two opposite surfaces, and the speaker device. Install the speaker device for the other channel, which is only reversely connected to the speaker unit, so that the speaker unit mounting surface of the speaker device does not face the viewer in both lateral directions or diagonally rearward of the viewer. By installing with a mounting means such as a speaker stand, an effective background sound field without a sense of localization can be reproduced at low cost.
Further, depending on the space in which the sound field is reproduced, it is possible to select a speaker device that is more inexpensive and can effectively reproduce the background sound field.

[Brief description of drawings]

FIG. 1 is a connection diagram of a rear channel amplifier unit and a background sound field speaker device according to a first embodiment of the present invention.

FIG. 2 is an installation example diagram of the entire speaker device of an AV system using the speaker device according to the first embodiment.

FIG. 3 is a connection diagram of a rear channel amplification unit and a background sound field speaker device according to a second embodiment of the present invention.

FIG. 4 is a connection diagram of a rear channel amplification unit and a background sound field speaker device according to a third embodiment of the present invention.

FIG. 5 is a diagram showing an installation example of the entire speaker device of an AV system using the speaker device according to the second and third embodiments of the present invention.

FIG. 6 is a diagram illustrating an installation example of a speaker device in a conventional home AV system.

[Explanation of symbols]

11, 21, 31 Rear left channel speaker devices 12, 22, 32 Rear right channel speaker device 13 Rear left channel signal amplification unit 14 Rear right channel signal amplification unit 15 Front left channel speaker device 16 Front center channel Speaker device 17 Front right channel speaker device 18 Viewers 11a, 12a, 21b, 22b, 31a, 32a Speaker unit

Claims (3)

[Claims] 1. A speaker device for a left channel or a right channel, in which a speaker unit is attached to one baffle surface of a cabinet, and the speaker device has a reverse electrical connection only to the speaker unit. A speaker device for a background sound field in which a speaker device for one channel is installed by an installation means so that the baffle surface of the speaker device does not face the direction of the viewer in the lateral direction or obliquely rearward of the viewer. 2. A speaker unit is mounted on one baffle surface of a cabinet, and the back surfaces of two speaker devices having the same performance are fastened together by fastening means, and the respective speaker devices are connected so as to reproduce the same signal. One set of speaker devices for the left channel or the right channel, and another set of speaker devices for which the electrical connection to the speaker unit is opposite to that of the speaker device for the other channel. A speaker device for a background sound field, which is installed laterally or obliquely rearward of a viewer by means of an installation means such that the speaker unit mounting surface of the speaker device does not face the direction of the viewer. 3. A set of speaker units is attached to one baffle surface of a cabinet, and another set of speaker units having the same performance is attached to a surface facing the baffle surface, and the speaker units have the same phase. The speaker device electrically connected to be driven is for the left channel or the right channel, and the speaker device in which only the electrical connection to the speaker unit is reverse to the speaker device is the other channel. For background use, a speaker device for background sound field is installed laterally or obliquely rearward of a viewer by an installation means so that the speaker unit mounting surface of the speaker device does not face the direction of the viewer.