JPH02145006A - Audio signal reproducing device - Google Patents

Abstract

PURPOSE:To avoid the central localization phenomenon generated between speakers by employing a conventional time delay device for a forward speaker, providing a time delay device newly for a backward speaker, inserting an inverting device to one time delay device to allow it to receive an inverted phase and inputting the signal to a power amplifier for left and right backward speakers. CONSTITUTION:A 2nd time delay circuit 17 receives an output of a difference detection circuit 8, a new delay signal S1 is obtained independently of a 1st delay device 9, the signal is given to a power amplifier 16 driving a right backward speaker 4 and the phase of the signal is inverted by an inverting device 18 and the resulting signal is given to a power amplifier 15 driving a left backward speaker 3 respectively. Thus, the delay component has a different signal or phase from each speaker and the central localization phenomenon generated between the speakers is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an audio signal reproducing device used for surround sound field reproduction.

(Conventional technology) In recent years, the development of surround sound field + II production technology has become possible due to the development of digital signal processing, which has made it possible to realize high-performance signal delay devices. It has become easier to create complex reflection patterns and delay patterns using signals and brochures, and it has become possible to enjoy sound field reproduction in the home using a variety of stones.

This type of conventional Odiniya Shinginsho player device is explained in Figure 3 and Figure 1.8 Figure 3 shows the basic speaker arrangement when reproducing a surround sound field at home. In this example, speakers 1 and 2 are placed on each side of the front left and right, and speakers 3 and 4 are placed on each side of the rear left and right, making a total of 31.1 speakers 1 to 1.
Listener 5 is in the middle 1:, ↑.

FIG. 4 is a professional sound diagram for reproducing O-day A' and ↑ C) using an audio signal reproducing apparatus for such an arrangement. In the same figure, there is a difference between the terminal 6 for the audio left main signal (hereinafter referred to as the following signal) of the left front speaker IJn and the terminal 7 for the audio right main signal (hereinafter referred to as the R signal) for the right front speaker 2. A component detection circuit 8 and a time delay device 9 are connected in series. The left front speaker 1 is
The L signal terminal 6 shown in "2" and the adder 10 and power amplifier 11 connected to the output side of the time delay device 9 shown in "-" are connected in series. Further, in the right front speaker 2, an adder 13 and a power amplifier 14 are connected in series to the above-mentioned R signal terminal 7, and an adder 13 and a power amplifier 14 are connected to the output side of the time d delay 9 in L through an inverter 12. . Further, the output side of the time delay device 9 is connected in parallel to the left rear speaker 3 and the right rear speaker 4 via power amplifiers 15 and 16, respectively.

The operation of the audio haiku playback device configured as described above will be explained.

In Figure 4, a compact disc player or V
The L and R signals of the two audio channels reproduced by a TR player etc. are output from terminals 6 and 7, respectively.
- It is input to the difference component detection circuit 8 that creates the R component, passes through the time delay device 9 that produces a feeling of reverberation, and is output as a delayed signal Su.
The signals are input to power amplifiers 15 and 16 that drive the left and right rear speakers 3 and 4, and are reproduced from the left and right rear speakers 3 and 4 as sounds SL and S3.

On the other hand, the delay in '-';'fSo is the adder 10
Therefore, the L signal of the 7 signal terminal 6 is added, resulting in r, +s.

The power amplifier 11 that drives the left front speaker 1 outputs the audio F8 from the left front speaker 1, and the inverter 1
The delayed signal -8° whose phase is inverted by adder 1
3, they are added to the R signal at the R signal terminal 7 to become RS, and are reproduced as audio FR from the right front speaker 2 by the power amplifier 14 that drives the right front speaker 2, thereby expanding the sound field. .

(Problem to be Solved by the Invention) However, in the above configuration, the audio FL is reproduced from the left front speaker 1, the audio F, l is reproduced from the right front speaker 2, and the audio S is reproduced from the left rear speaker 3. The sound SR reproduced from the right rear speaker 4 consists of signal components expressed by equations (1) to 3) shown in the first order.

FL=L+S, (1) FR=R-8o (2) SL=S, 1=So (3) Therefore, in FIG. 3, when comparing the delayed signal S0, first, the left and right front sounds FL, F, and l are Since the components are out of phase with each other, there is no front center localization, and left and right rear audio SL
Since both SR and SR are in-phase components, they are localized at the rear center position. Also, since it is an in-phase component with the left front and left rear sounds FL and SL, it is localized at the center left position. Since the right front and right rear sounds F11 and SR have antiphase components, there is no localization.

Since the left front sound FL and the right rear sound SR are both in-phase components, they are localized at the diagonal center position, and the right front sound FR
Since the left and rear audio SL are mutually antiphase components, there is no localization. In this way, the delayed signal S0 is.

Depending on the combination with each of the speakers 1 to 4, in-phase or out-of-phase components may be generated, resulting in the presence or absence of localization, resulting in unbalanced sound field reproduction. Therefore, there was a problem in that the effect of installing the rear speakers was weakened, and sufficient functionality could not be achieved.

The present invention solves the above-mentioned problem, and provides an audio signal reproducing device that reproduces a balanced sound field with a sense of spaciousness, where no matter which speaker combinations are used, they are not in phase, and therefore central localization does not occur. This is what we provide.

(Means for Solving the Problems) In order to solve the above problems, the present invention replaces the conventional time delay device for the front speakers with a new time delay device for the rear speakers, and inserts an inverter into one side. The output signal is input to the power amplifiers for the left and right rear speakers, respectively, with the phase opposite to that of the other.

(Function) With the above configuration, the delay components IIj generated from each speaker are components having different signals or phases, so that the center localization phenomenon occurring between each speaker is
91), creating a more expansive reverberation effect.

(Example) An example of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram showing the configuration of an audio signal reproducing apparatus according to the present invention. This embodiment differs from the conventional example shown in FIG. A second time uf extender 17 is installed in parallel with the first time uf extender 17.
, and stop the parallel connection from the first delay device 9 to the power amplifiers 15 and 16 for the rear speakers, and connect the second delay device 17 to the power amplifier 15 described above.
and 16, one side, that is, the left rear speaker in this embodiment;
On the other hand, the power amplifier for right rear speaker 4] (5
The number is the point connected in parallel.The other points remain unchanged.

The same components are given the same reference numerals and their explanations will be omitted.

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

The output paths of speakers 1 and 2 on the left and right sides are as follows:
Since this is the same as the conventional example, the explanation will be omitted, and the output paths of the left and right rear speakers 3 and 4 will be explained.

On the other hand, the second time delay circuit 17 converts the output of the difference component detection circuit 3 into a new delay signal S, independently of the first time delay 89.
, and the power amplifier 1 that drives the right rear speaker 4.
6, also, the power amplifier 1 which inverts the position ■ 1 and makes the left rear subikako (1qλII!Ij
13 will be provided with human resources. In this way, from each speaker]1. 5°F, = r, + s, (4) FIl=R
-8, (5) SL=St (6) S,=:31 (7) In other words, the delay component is different from each speaker (+)
11 or phase, and the central localization phenomenon that occurs between each speaker is eliminated.

As described in 1- below, according to this embodiment, the sense of realism without localization, which is the original 5 surround effect, is 1! ), the effect of installing rear speakers becomes more noticeable. Also,
Although it is necessary to add a new time delay device to the device, recently the time delay device has been implemented digitally, and this method allows the read address of the storage element to be changed. This can be easily realized by simply adding a new read address generation section.

(Effects of the Invention) As described below-1-, according to the present invention, since a reverberation signal without central localization is reproduced, it is possible to control not only the conventional sound field reproduction only in the rear, but also the sense of depth in the front. Is there an audio signal playback device that can do this? :) I can do it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an audio signal reproducing device according to the present invention, and FIG. 2 is a plan view of a home viewing room illustrating the arrangement of speakers and the direction of sound localization according to the present invention.
FIG. 3 is a plan view of a home viewing room illustrating the arrangement of conventional speakers and sound image localization directions, and FIG. 4 is a block diagram showing the configuration of a conventional audio signal reproducing apparatus. 1...Left front speaker, 2...Right front speaker:
, external speaker, 4... 5... listener, 6... ■signal/terminal, 8... l, +r delay device and 10, 13... adder, power amplifier, 12°・Second time delay snoring 41:(. Bee force, ;3・Right rear speaker, L (Ii terminal, W・Difference component detection circuit, 9 and first time delay 8:+. 11, 14.15 .16... 18...Inverter, 17

Claims (1)

[Claims] A first time delay device and a second time delay device each capable of independently controlling the delay time are provided in parallel after the difference component detection circuit into which the left and right main signals of the two audio channels are input,
The output of the first adder that mixes and adds the output of the first time delay device and the input audio left main signal is used as the left front speaker output, and the first inverter outputs the above-mentioned signal whose phase is inverted. The output of the second adder that mixes and adds the output of the first time delay device and the input audio right main signal is used as the right front speaker output, while the output of the second time delay device is used as the left and right rear speaker output. Output from one of the speakers,
Also, an audio signal reproducing device in which the output of the second time delay device whose phase is inverted by the second inverter is outputted from the other speaker.