JPH03157100A - Audio signal reproducing device - Google Patents

Abstract

PURPOSE:To make a picture image and a sound image coincident and to avoid the unnaturalness by providing a level adjuster adjusting and mixing separated front L, C, R signals independently and an adder mixing and adding level adjustment outputs in parallel so as to synthesize upper and lower sound images. CONSTITUTION:Dolby prologic decoder 1 separates front L, C, R signals and they are subjected to level adjustment independently through a level adjustment device 3 and they are inputted to an adder 4, where they are mixed and a resulting sub center signal created as a sub center signal is amplified through a power amplifier 5 and sound is reproduced from a sub center speaker 9. Conventional sound image location reproduced by front speakers 8L, 8C, 8R installed on a floor is located easily upward by the provision of the sub center speaker 9. Then sound is outputted from the inside of a video reproduction screen 11 and the picture image and the sound image are made coincident.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an audio playback device for an audio/visual software playback device.

Conventional technology The development of audio-visual equipment in recent years has been remarkable.Dolby audio signal playback has become more popular as monitor screens have become larger due to Gloziection TV, laser discs have become more widespread, and VTRs have become more sophisticated. With the advent of the Pro Logic decoder (decoder system described in Japanese Patent Application Laid-open No. 61-251400), high-performance, high-output audio components were combined to provide sound quality comparable to that of a video theater, and to create a sound field for audio/visual software such as movies. The need for home theaters to be enjoyed at home is increasing.

In addition, the quality of audio and visual software has been improved from conventional monaural recording to stereo 2nd channel recording and even Dolby surround recording that incorporates surround components.

Development can be expected from both sides of the hardware.

When playing audio/visual software in a home theater, as shown in Figures 3(a) and (b), there is a video playback screen 11 in the center, front speakers 8L for Lch, 8R for Rch, and center on both sides. a
8C for h is placed, and surround speakers 1QL and 10R are placed on the left and right rear of the operator.

FIG. 4 is a block diagram for reproducing the audio signal of FIG. 3. In Figure 4, 1 is the second channel of the audio channel.
Dolby Pro Logic decoder that separates the signal into C, R, and surround S signals, 2 is a power amplifier for front reproduction, 6 is a surround signal processing block, 7 is a power amplifier for surround reproduction, 8L, 8C, aRid front speakers , 1oL, and 1QR are surround speakers.

The operation of the audio signal reproducing apparatus configured as described above will be explained.

A video signal reproduced by an audio/visual reproduction device such as a laser disc or a VTR is visualized on a video reproduction screen 11 shown in FIG. 3, allowing the user to enjoy the power of a large screen. On the other hand, the audio signal is input to the Dolby Pro Logic decoder 1 as shown in Fig. 4 (Lt signal, Rt double signal, separated into four signals: front signal, C, R, and surround signal S) for front reproduction. Front speakers aL and sC via power amplifier 2.

At the same time as each front side is reproduced by 8R, the surround signal is subjected to predetermined delay and noise reduction processing by the surround signal processing block 8, and then
The sound is reproduced from the surround speakers 10L and 1QR via the power amplifier 7 for surround reproduction.

Problems to be Solved by the Invention However, with the above-described configuration and installation, a mismatch between the image and the sound image occurs. For example, when the image 1゛Φ serving as the sound source falls on the center of the picture reproduction null screen 11, the sound to be reproduced is reproduced from the front speaker 8C, but generally, as shown in Fig. 5, the front speaker is The video playback screen 11 is often used for music playback and is placed on the floor.
The sound can be heard from below. In addition, as a means to solve this problem, it is sufficient to install front speakers sL, sc, and 8R behind the video playback screen 11.
Deterioration of sound image localization due to the influence of the video playback screen 11 1 Passage loss occurs, which is not common Was.

In view of the above-mentioned problems, the present invention controls sound image localization by mixing and adding Freon) L, C, and R signals and reproducing them by a sub-center speaker installed above the NuClean 11 for video reproduction. An object of the present invention is to provide an audio signal reproducing device that improves sound image mismatch.

Means for Solving the Problems In order to achieve this object, the audio signal reproducing device of the present invention comprises separated fluorocarbons) L and C.

A level adjuster that mixes and adjusts each R signal independently and an adder that mixes and adds the level adjustment outputs are provided in parallel, and a power amplifier and a subcenter speaker that amplify the output of the adder are connected in series. is the separated Freon L-L,C.

The front speakers that reproduce the R signal are installed upside down with a screen in between.

Effect of the present invention The sound image localized below the front with the above-described installation configuration is reproduced by the sub-center speaker installed above, so that the upper and lower sound images are synthesized and are emitted as a virtual sound source from the position inside the NuClean. It becomes possible to localize. In other words, by simply adding a simple circuit and speakers, audio playback that was previously localized as a sound image can be localized within the screen, making it possible to reproduce audio/visual software in which the image and sound image match.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, left and right channel audio signals Lt and Rt signals reproduced by an audio visual device such as a laser disc or a VTR are provided to a Dolby Pro Logic decoder 1. The Dolby Pro Logic decoder 1 separates the audio signals Lt and Rt recorded by the Dolby encoder into C, R signals and surround S signals. is given to the front reproduction power amplifier 2. The front reproduction power amplifier 2 performs power amplification, and its output is given to the front speakers aL, sC, and sR. Among the outputs of the Dolby Pro Logic decoder 1, the other one, C, and R signals are given to a level adjuster 3. Level adjuster 3 burrs,
The levels of the C and R signals are adjusted independently, and the output thereof is given to the adder 4. The adder 4 independently adjusts the level and mixes and adds the C and R signals, and its output is given to the power amplifier 5. Power amplifier 6 performs mixing and addition.

It performs power amplification of the C, R combined signal, and its output is given to the sub-center speaker 9.

The surround S signal separated by the Dolby Pro Logic decoder 1 is provided to a surround signal processing block 6. The surround signal processing block 6 performs predetermined delay and noise reduction processing, and its output is given to a power amplifier 7 for surround reproduction. The surround reproduction power amplifier 7 amplifies the power of the surround signal, and its output is supplied to the surround noupika 10.
L.

Given to 10R.

FIG. 2(a) shows the front speaker 8L of FIG.

How to install sC, sR and sub-center speaker 9,
It is a front view of a domestic listening room in which a sound image localization position is installed, and FIG. 2('b) is a side view. In Figure 2,
11 is a screen for video reproduction.

The operation of the audio signal reproducing apparatus of this embodiment will be explained below.

In FIG. 1, input audio signals Lt, R
The t@ signal is separated into front L, C, R signals and surround S signal by the Dolby Pro Logic decoder 1.
One of the front L, C, and R signals passes through the front reproduction power amplifier 2, is power amplified, and is sent to the front speakers aL, sc.

Each sound is played from 8R. Further, the surround S signal separated by the Dolby Pro Logic decoder 1 is subjected to predetermined delay and noise reduction processing by the surround signal block 6, and power amplified by the surround reproduction power amplifier 7.
Sounds are played for each of L and 10R. The above configuration and operation are the same as those of the conventional example, but after the L, C, and R signals separated by the Dolby Pro Logic decoder 1 are level-adjusted independently through the level adjuster 3, are input to an adder 4 that mixes and adds them, and generates a subcenter signal.

The generated sub-center signal is power amplified through the power amplifier 5, and the sound is reproduced from the sub-center speaker 9. Here, front L and C.

The R signals are respectively LO, C○, and R○, the level increase/decrease coefficients of the level adjuster 3 are KL, KC, and KR, and the signals reproduced by the front speakers aL, sc, 8R, and sub-center speaker 9 are respectively Loud. .

Let Cout, Rout, and C5ub be expressed by the following formulas.

Lout=LO(1) Cout=CO(2) Rout=RO(3) Csub-KL-LO+KC-CO+KR-RO(4)
That is, the C5ub signal includes all the front signal components 9, and the front speakers sL, sc, aR and sub-center speaker 9 installed as shown in FIG. 2(a).
In the arrangement, the sound image reproduced from the front is KL
, KC, and KR are adjusted by sLI and sCI shown by dashed lines.
, sRl, a sound image is localized as a virtual sound source. Conventional sound image localization reproduced from front speakers 8L, SC, and sR installed on the floor is subcenter speaker 9.
As a result of the expansion, the sound is easily localized upwards as shown by the dashed line in Fig. 2 (with), and the sound is emitted from inside the video playback screen 11, making it possible to match the image and sound image. becomes possible.

As described above, according to this embodiment, sound image localization can be freely controlled by simply adding a level adjuster and an adder to the circuit and reproducing the output signal of the adder using a power amplifier and a sub-center speaker. It is possible to match images and sound images when playing visual software.

Effects of the Invention The present invention focuses on the installation state of speakers and the naturalness of images and sound images when playing audio/visual software,
By reproducing a signal obtained by mixing and adding front audio signals using a sub-center speaker, this audio signal reproducing device can arbitrarily control sound image localization and easily realize a sense of unity between image and sound image.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an audio signal reproducing device according to an embodiment of the present invention, and FIG. 3(a) is a front view of the conventional front speaker installation method, 3(b) is the same plan view, and 4th is the same side view. 5 is a block diagram showing the configuration of a conventional audio signal playback device.
This figure is a side view illustrating the conventional front speaker installation and sound image localization direction of FIG. 3(a). 1...Dolby Pro Logic decoder, 2...
...Front playback power amplifier, 3...
Level adjuster, 4... Addition device, 5...
Power amplifier, 6...Surround signal processing block, 7...Hower amplifier for surround playback,
8L...Front speaker (Lah), 8C.
...Front speaker (Cch), 8R...
...Front speaker (Rch), 9...Sub center speaker, 10L...Surround speaker (L), 10R...Surround speaker (
R), 11... Screen for video playback.

Claims (1)

[Claims] After the Dolby Pro Logic decoder that separates the audio signals Lt and Rt of Dolby encoded audio/visual software into front L signal, R signal, center signal, and surround signal, the front L signal, R signal, and center signal are installed. a level adjuster that independently mixes and adjusts the front L signal, R signal, and center signal, and an adder that mixes and adds the outputs of the level adjuster, in parallel with a front reproduction power amplifier group that reproduces the front reproduction power amplifier group, and a front speaker group. A power amplifier for amplifying the output of the adder and a sub-center speaker are connected in series, and the sub-center speaker is installed upside down with respect to the front speaker group and a screen for reproducing video signals, and an imaginary sound source is emitted from inside the screen. An audio signal reproducing device characterized in that the audio signal is reproduced in the forward direction.