JPH0662489A - Multichannel audio reproducing device - Google Patents

Abstract

PURPOSE:To provide the audio reproducing device of good installability and of lees distortion of tone quality by providing speakers on the upper side and the lower side of a display screen and providing an HPF on the front stage of the speaker on the upper side. CONSTITUTION:First and second center speakers 22 and 20 are arranged on the upper side and the lower side of the screen of a video display device 14. An HPF 21 is provided on the front stage of the speaker 22, and the speaker 22 is used for reproducing of high band sounds and can be miniaturized. As the result, a multichannel audio reproducing device is obtained which has superior installability and has less degradation of tone quality due to the difference of distances from respective speakers.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. Four
2, No. HDTV 3-1 system described in 6
For example, a catalog S-, which is constructed based on a conventional multi-channel audio reproducing device for reproducing channel stereo,
It is a block diagram which shows the structure of Mitsubishi Electric Corporation Cinema Nouveau 36 described in C4141-A. In the figure, 1 is a 4-channel audio source such as a MUSE 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 a left-channel audio signal output from the 4-channel audio source 1 and 5 is a 4-channel audio source 1
A rear channel audio signal output from the amplifier, 6 an amplifier circuit for amplifying the right channel audio signal 2, 7 an amplifier circuit for amplifying the center channel audio signal 3, and 8 an amplifier circuit for amplifying the left channel audio signal 4. , 9 are amplifier circuits for amplifying the rear channel audio signal 5 and 10
Is a right speaker driven by the amplifier circuit 1, 1
1 is a center speaker driven by the amplifier circuit 7, 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 CRT for reproducing a video signal, etc. The video display device 15 is a viewer.

Next, 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.

FIG. 5 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. 5, the center speaker 11 is arranged below the screen of the image display device 14.

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

Next, the operation and configuration of each part will be described. The center channel audio signal 3 is divided into two parts, one of which is amplified by the first amplifier circuit 17 and converted into audio by the first center speaker 19. The other is amplified by the second amplifier circuit 18 and converted into sound by the second center speaker 20.

In FIG. 6, the first center speaker 1
9 is arranged on the upper side of the screen of the video display device 14, and the second center speaker 20 is arranged on the lower side of the screen.

[0009]

In FIG. 5, 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. 6, 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 image display device 14, it is necessary to secure an extra space for that, and there is a problem that the installability is deteriorated.

Since two center speakers are used, there is a difference between the distance from the first center speaker 19 to the viewer 15 and the distance from the second center speaker 20 to the viewer 15. Then, there was a problem that the voice became dull and the sound quality deteriorated.

The present invention has been made to solve the above problems, and an object of the present invention is to realize a multi-channel audio reproducing apparatus which is easy to install and has little deterioration in sound quality.

[0013]

In a multi-channel audio reproducing device according to the present invention, a high-pass filter (hereinafter referred to as HPF) is provided in front of a first center speaker arranged above the screen of a video display device. It is a thing.

Further, the first center speaker is a speaker suitable for high-frequency reproduction.

[0015]

The multi-channel audio reproducing device according to the present invention is
By providing an HPF in front of the first center speaker arranged above the screen of the video display device, the first center speaker is miniaturized, and the sound quality deteriorates due to the difference in distance from each center speaker to the viewer. To improve.

Further, by constructing the first center speaker with a speaker suitable for high-pitched sound reproduction, the first center speaker is miniaturized, and deterioration in sound quality due to a difference in distance from each center speaker to a viewer occurs. Improve.

[0017]

Embodiment 1 FIG. 1 is a diagram showing the configuration of a multi-channel audio reproducing apparatus according to Embodiment 1 of the present invention. In the figure, 21 is an HPF that allows only high-frequency audio signals to pass, and 22 is a video display device 1.
A first center speaker 22a arranged on the upper side of the screen of No. 4 is a high-frequency unit of the first center speaker 22. The other parts are the same as those of the conventional example (see FIG. 6), and the description thereof will be omitted.

Next, the operation and configuration of each part will be described. The center channel audio signal amplified by the first amplifier circuit 17 is separated into a high frequency audio signal by the HPF 21, and converted into audio by the first center speaker 22.

As described above, when the HPF 21 is provided in the preceding stage of the first center speaker 22, the high-pitched sound unit 22a can be used as the speaker unit, and the first center speaker 22 can be downsized. As a result, the first center speaker 22 can be built in the video display device 14. Therefore, it is not necessary to secure an extra space for the first center speaker, and the installability is improved.

Since the first center speaker 22 reproduces only the high frequency sound signal, the distance from the first center speaker 22 to the viewer 15 and the second
The sound drop due to the difference in the distance from the center speaker 20 to the viewer 15 is reduced, and the sound quality deterioration is improved.

Embodiment 2 FIG. 2 is a diagram showing the structure of a multi-channel audio reproducing apparatus according to Embodiment 2 of the present invention. In the figure, reference numeral 23 is a speaker suitable for high-frequency reproduction, for example, a first center speaker composed of a piezoelectric speaker. The other parts are the same as those of the conventional example (see FIG. 6), and the description thereof will be omitted.

First, the principle of operation of the piezoelectric speaker that constitutes the first center speaker 23 will be described (see FIG. 3). In the figure, 101 is an AC power supply, and 102
Is a metal electrode, 103 is a polymeric piezoelectric material, for example, a polymeric piezoelectric film formed by filming polyvinylidene fluoride, and generates stress when a voltage is applied. Metal electrodes 102 are attached to both surfaces of the polymeric piezoelectric film 103. When an AC voltage output from the AC power supply 101 is applied to the metal electrode 102, the piezoelectric polymer film 103 expands and contracts in the direction perpendicular to the electric field (= X direction in FIG. 3). Therefore, when the polymeric piezoelectric film 102 is curved or used with both ends fixed, the expansion and contraction motion is converted into vertical motion, and it operates as a speaker.

Next, the structure of the first center speaker 23 will be described. The first center speaker 23 is a piezoelectric speaker. On the other hand, the reproduction band of the piezoelectric speaker is determined by the area, and the smaller the area, the higher the band moves. Therefore, in order to improve the sound quality deterioration due to the difference in the distance from each center speaker to the viewer, when only the high frequency audio signal is reproduced by the first center speaker 23, the first center speaker 23 is used. Is a small size. As a result, the first center speaker 23 can be built in the video display device 14, and the installability is improved.

As described above, when the first center speaker 23 is composed of the piezoelectric speaker, the HPF 21 can be omitted, and the cost can be reduced as compared with the first embodiment.
Further, since a normal speaker uses a magnet, when it is built in the image display device 14, it is necessary to prevent the screen from being magnetized. On the other hand, since the piezoelectric speaker does not use a magnet, there is no need for magnetic shielding, which further reduces the cost.

Third Embodiment In the second embodiment, the first center speaker 23 is composed of a piezoelectric speaker, but other speakers suitable for high frequency reproduction, such as ceramic speakers, may be used.

Embodiment 4 In the above embodiment, the case of reproducing the 3-1 system 4-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.

[0027]

As described above, according to the present invention, the first center speaker arranged on the upper side of the screen of the image display device is miniaturized and built in the image display device, so that the installability is not impaired. A natural sound image localization can be obtained.

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

FIG. 3 is a diagram for explaining the operation principle of the piezoelectric speaker.

FIG. 4 is a block diagram showing a configuration of a conventional multi-channel audio reproducing device.

FIG. 5 is a diagram showing a general arrangement of center speakers in 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.

[Explanation of symbols]

17 1st amplification circuit 18 2nd amplification circuit 20 2nd center speaker 21 HPF 22 1st center speaker 23 1st center speaker comprised by the speaker suitable for high-pitched sound reproduction

[Procedure amendment]

[Submission date] October 22, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Since two center speakers are used, there is a difference between the distance from the first center speaker 19 to the viewer 15 and the distance from the second center speaker 20 to the viewer 15. And the sound is muffled
And Mai sound quality there is also a problem of deterioration.

Claims (2)

[Claims] 1. A multi-channel audio reproducing apparatus in which a first center speaker is arranged on the upper side of the screen of a video display device, and a second center speaker is arranged on the lower side of the screen. A multi-channel audio playback device featuring a high-pass filter in the previous stage. 2. A multi-channel audio reproducing apparatus in which a first center speaker is arranged on the upper side of the screen of a video display device and a second center speaker is arranged on the lower side of the screen, wherein the first center speaker is A multi-channel audio playback device comprising a speaker suitable for high-pitched sound reproduction.