JPH0670393A - Multi-channel sound reproducing device - Google Patents

Abstract

PURPOSE:To obtain the sound reproduction device in which a natural sound image localization is obtained with superior installation characteristics by employing an oblique cone speaker on a 1st center speaker arranged upward above a screen of a video display device. CONSTITUTION:An oblique cone speaker 21 is employed for a 1st center speaker 19 arranged upward above a screen of a video display device 14 and the speaker 21 is fitted to the device so that its longer side is directed forward. Furthermore, the sound radiates forward by fitting a diffuser to the 1st center speaker. As a result, the sound of the 1st center speaker 19 radiates forward. Since a sound pressure level is obtained more at a position of a listener, the position of a sound image from center speakers 19, 20 is coincident with a position of a picture of a picture display device 14 and a natural sound image localization is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel audio reproducing apparatus for improving sound localization.

[0002]

2. Description of the Related Art FIG. Four
2, No. HDTV 3-1 system described in 6
It is a block diagram which shows the structure of the conventional multi-channel audio reproducing apparatus which reproduces a channel stereo, for example, Cinema Nouveau 36 manufactured by Mitsubishi Electric Corporation described in catalog S-C4141-A. In the figure, 1 is MUSE
4 channel audio source such as a decoder, 2 is a right channel audio signal output from the 4 channel audio source 1, 3 is a center channel audio signal output from the 4 channel audio source 1, 4 is the 4 channel audio source 1 Left channel audio signal output from 5
Is a rear channel audio signal output from the 4-channel audio source 1, 6 is an amplifier circuit for amplifying the right channel audio signal 2, 7 is an amplifier circuit for amplifying the center channel audio signal 3, and 8 is the left channel audio signal. An amplifier circuit for amplifying the signal 4, 9 is an amplifier circuit for amplifying the rear channel audio signal 5, 10 is a right speaker driven by the amplifier circuit 6, 11 is a center speaker driven by the amplifier circuit 7, Reference numeral 12 is a left speaker driven by the amplifier circuit 8, 13 is a rear speaker driven by the amplifier circuit 9, 14 is a video display device such as a CRT for reproducing a video signal, and 15 is a viewer.

First, the operation of each part will be described. Four
The audio signals 2 to 5 of each channel output from the channel audio source 1 are independently amplified by the amplifier circuits 6 to 9, respectively, and the right speaker 10, the center speaker 11,
It is converted into sound by the left speaker 12 and the rear speaker 13, and is perceived by the viewer 15.

Next, the arrangement of the center speaker will be described. FIG. 6 is a diagram showing a general arrangement of center speakers in a conventional multi-channel audio reproducing device. In the figure, 11a is a center speaker 11
Speaker unit, 14a is a cathode ray tube of the video display device 14, 16 is the video display device 14, or V
It is a TV stand for housing AV equipment such as TR.

In FIG. 6, the center speaker 11 is arranged on the lower side of the screen of the image display device 14 so as to face forward.

FIG. 7 also shows a general arrangement of center speakers in a conventional multi-channel audio reproducing apparatus. In the figure, 17 and 18 are first and second amplification circuits for amplifying the distributed center channel audio signal, 19 is a first center speaker arranged on the upper side of the screen of the video display device 14, and 19a is the above-mentioned first speaker. 1 is a speaker unit of the center speaker 19; 20 is a second center speaker disposed below the screen of the image display device 14; and 20a is a speaker unit of the second center speaker 20.

The center channel audio signal 3 is divided into two, one of which is amplified by the first amplifier circuit 17 and converted into audio by the first center speaker 19. Also,
The other is amplified by the second amplifier circuit 18 and converted into sound by the second center speaker 20.

In FIG. 7, the first center speaker 1
9 is arranged on the upper side of the screen of the image display device 14 so as to face forward,
The second center speaker 20 is arranged frontward on the lower side of the screen.

Further, FIG. 8 is also a diagram showing a general arrangement of center speakers in a conventional multi-channel audio reproducing apparatus. The housing of the image display device 14 is a cathode ray tube 14.
Since it is molded along the shape of a, a recess is formed on the upper surface. In FIG. 8, the first center speaker 19 is arranged upward in the recess. Other parts are the same as in FIG. 7.

[0010]

In FIG. 6, the sound image of the center speaker 11 is located below the image of the video display device 14. As a result, there is a problem in that the position of the sound image and the position of the image are deviated, resulting in unnatural sound image localization.

On the other hand, in FIG. 7, the sound images of the center speakers 19 and 20 are combined and localized between the two speakers. As a result, the position of the sound image matches the position of the image, and a natural sound image localization is obtained. However, since the first center speaker 19 is mounted on the video display device 14, it is necessary to secure an extra space for that, and there is a problem that the installation property is deteriorated.

Further, in FIG. 8, the installability is improved as compared with FIG. 7. However, since the first center speaker 19 is arranged upward, the sound of the first center speaker 19 is radiated upward. As a result, there is a problem in that the sound pressure level cannot be obtained at the position of the viewer 15 and the sound images of the center speakers 19 and 20 are closer to the second center speaker 20.

The present invention has been made in order to solve the above problems, and a natural sound image localization can be obtained, and
It is an object of the present invention to realize a multi-channel audio reproducing device with good installability.

[0014]

In the multi-channel audio reproducing device according to the present invention, an oblicorn speaker is used as the first center speaker which is arranged upward on the upper side of the screen of the video display device.

Further, a diffuser for diffusing sound is attached to the first center speaker.

[0016]

The multi-channel audio reproducing device according to the present invention is
By using an oblicorn speaker for the first center speaker arranged upward on the screen upper side of the image display device, sound is emitted forward.

A sound is emitted in a forward direction by attaching a diffuser to the first center speaker.

[0018]

Embodiment 1 FIG. 1 is a diagram showing the configuration of a multi-channel audio reproducing apparatus in Embodiment 1 of the present invention. In the figure, 21 is an oblicorn speaker. Other parts are conventional examples (see FIG. 8).
Since the same as that of the reference), the description thereof will be omitted.

First, the difference between a general cone speaker and an obli-cone speaker will be described. FIG. 2 is a sectional view showing the structure of a general cone speaker. In the figure, 101 is a magnet, 102 is a bottom yoke, and 103.
Is a top yoke, 104 is a voice coil, and 105 is a diaphragm.

In a typical cone speaker, the magnet 10
1, the voice coil 104 is placed in the magnetic field of the magnetic circuit composed of the bottom yoke 102 and the top yoke 103,
The diaphragm 105 is vibrated by the driving force generated by flowing the voice signal to the voice coil 104, and the voice signal is converted into the voice. On the other hand, since the driving part of a general cone speaker is located at the center of the speaker unit, the sound radiation pattern is as shown in FIG.

FIG. 3 is a sectional view showing the structure of an oblicorn speaker. Oblique cone speaker diaphragm 10
Reference numeral 4 is an oblivious shape (= a shape in which a cone is cut obliquely), and the driving portion is displaced from the center of the speaker unit. Therefore, the sound radiation pattern is as shown in B of FIG.
Offset in the long side direction.

Next, the structure and operation of each part will be described. An oblicorn speaker 21 is used as the first center speaker 19 and is attached so that the long side direction faces the front side.

As a result, the first center speaker 1
The sound of 9 is emitted forward. Therefore, since the sound pressure level can be obtained at the position of the viewer 15, the positions of the sound images of the center speakers 19 and 20 and the image display device 14 can be obtained.
The positions of the images are matched and a natural sound image localization is obtained.

Embodiment 2 FIG. 4 is a diagram showing the structure of a multi-channel audio reproducing apparatus in Embodiment 2 of the present invention. In the figure, 21 is a diffuser for diffusing sound. The other parts are the same as in the conventional example (see FIG. 8), and therefore the description thereof is omitted.

Next, the structure and function of each part will be described. The first center speaker 19 has a diffuser 2
2 is attached. The diffuser 22 is, for example,
It has a conical shape and diffuses the sound emitted upward from the first center speaker 19.

As a result, the first center speaker 1
The sound of 9 is emitted forward. Therefore, since the sound pressure level can be obtained at the position of the viewer 15, the positions of the sound images of the center speakers 19 and 20 and the image display device 14 can be obtained.
The positions of the images are matched and a natural sound image localization is obtained.

Embodiment 3 In the above embodiment, the case of reproducing the 3-1 system four-channel stereo for high-definition has been described, but the present invention can be applied to the Dolby Surround system having a similar channel configuration, The effect is obtained.

[0028]

As described above, according to the present invention, the sound of the first center speaker, which is arranged upward on the upper side of the screen of the image display device, is radiated in the forward direction. A natural sound image localization can be obtained without impairing it.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a multi-channel audio reproducing device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the configuration of a general cone speaker.

FIG. 3 is a cross-sectional view showing a configuration of an oblicorn speaker.

FIG. 4 is a diagram showing a configuration of a multi-channel audio reproducing device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional multi-channel audio reproducing device.

FIG. 6 is a diagram showing a general arrangement of center speakers in a conventional multi-channel audio reproducing device.

FIG. 7 is a diagram showing a general arrangement of center speakers in a conventional multi-channel audio reproducing device.

FIG. 8 is a diagram showing a general arrangement of center speakers in a conventional multi-channel audio reproducing device.

[Explanation of symbols]

 17 First Amplifying Circuit 18 Second Amplifying Circuit 19 First Center Speaker 20 Second Center Speaker 21 Oblicorn Speaker 22 Diffuser

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[Procedure amendment]

[Submission date] June 28, 1993

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Claims (2)

[Claims] 1. A multi-channel audio reproducing device in which a first center speaker is arranged upward on a screen upper side of a video display device and a second center speaker is arranged forward on a screen lower side of the video display device. A multi-channel audio playback device characterized by using an oblicorn speaker for the center speaker. 2. A multi-channel audio reproducing device in which a first center speaker is arranged upward on a screen upper side of a video display device, and a second center speaker is arranged forward on a screen lower side of the video display device. A multi-channel audio playback device characterized in that a diffuser for diffusing sound is attached to a center speaker.