JPH11168800A - Loudspeaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized loudspeaker device for use in accoustic equipment, capable of performing satisfactory stereo sound reproduction, especially by a single loudspeaker. SOLUTION: In this loudspeaker, difference signals between L-channel signals and R-channel signals are inputted to a speaker 1a on an L side, sum signals are inputted to a center speaker 1b and difference signals of between R-channel signals and L-channel signals are inputted to a speaker 1c on an R-side. Then, the speaker 1a on the L-side supplies respective signals through a filter means for weighting the L-channel signals below the cut-off frequency of a low band and the speaker 1c on the R-side supplies respective signals via the filter means for weighting the R-channel signals below the cut-off frequency of the low band.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker device for performing stereo reproduction by providing a plurality of loudspeakers in one cabinet.

[0002]

2. Description of the Related Art A conventional speaker device will be described with reference to FIG. FIG. 5 is a plan view for explaining the configuration outline and the sound field.

According to FIG. 1, reference numerals 1a, 1b, and 1c denote speakers, and a left speaker 1a and a right speaker 1c are disposed at positions shifted by θ ₁ and θ ₂ from the center speaker 1b.

The operation of the above-described speaker device configured as described above will be described below. The synthesized signal (R + L) of the R channel and the L channel is transmitted to the center speaker 1b and the left speaker 1a is transmitted to the left speaker 1a. Represents the difference signal (LR) between the R channel and the L channel, and the right speaker 1c outputs the opposite phase signal (RL) of the difference signal to the L and R channel signals from an amplifier (not shown). Input after processing.

In this case, each of the speakers 1a to 1c
The sound field created from the appropriate directivity 2a,
2b, 2c, (LR) in the sound field 2d
+ (R + L) = 2L, and in the sound field 2e, (R + L)
L) + (RL) = 2R sound field is created. As a result, the left channel signal is localized on the left side and the right channel signal is localized on the right side for the listener 3, so that a single speaker device can reproduce the stereo sound field as a whole.

[0006]

However, the above loudspeaker device is assumed to have a fixed directivity within the entire audible frequency band. It tends to have a wide directivity in the low range and narrow in the high range.

Further, as a human listening characteristic, the sound source direction is estimated mainly by the phase difference in the low sound range and mainly by the sound pressure difference in the high sound range.

Therefore, the above-mentioned speaker device does not operate completely except in the middle frequency range, and is insufficient as a stereo reproducing device.

[0009]

In order to solve the above-mentioned problems, a speaker device according to the present invention comprises three speakers arranged in a horizontal direction so that at least an L-channel signal and an R-channel signal are inputted and a reproduced sound is diffused. The difference signal between the L channel signal and the R channel signal is input to the L speaker, the sum signal of the L channel signal and the R channel signal is input to the center speaker, and the R signal is input to the R speaker. The difference signal between the channel signal and the L-channel signal is input, and the L-side loudspeaker is connected to the low-side cutoff frequency by a filter means that weights the L-channel signal below the low-frequency cutoff frequency. The L or R channel signal is passed through the L or R channel signal through filter means which weights the R channel signal below the frequency. Since was fed to R side speaker, good stereo reproduction over the entire range capable speaker apparatus is one that can be provided.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, at least three speakers are arranged in a horizontal direction so that at least an L-channel signal and an R-channel signal are input and a reproduced sound is diffused. The difference signal between the L channel signal and the R channel signal is input to the speaker, the sum signal of the L channel signal and the R channel signal is input to the center speaker, and the R channel signal and the R signal are input to the R side speaker. While inputting the difference signal of the L channel signal,
The L-side loudspeaker passes through the filter means weighting the L-channel signal below the low-frequency cutoff frequency, and the R-side loudspeaker passes through the filter means weighting the R-channel signal below the low-frequency cutoff frequency. The L or R channel signal is converted to the L or R signal.
This is supplied to the side speakers, and it is possible to realize good stereo reproduction in a wide frequency range with one small speaker device.

An embodiment of the present invention will be described below with reference to FIGS. The arrangement of the speakers in the speaker device according to the embodiment of the present invention is the same as that of the prior art.

FIG. 1 is a circuit configuration diagram of an embodiment of the speaker device of the present invention, and FIGS. 2A to 2D are main parts shown in the circuit configuration diagram of FIG. 1, respectively. FIG. 3 is a frequency characteristic diagram of the filter circuits L ₁ , L ₂ , R ₁ and R ₂ , FIG. 3 is a plan view showing a sound field in a reproduction state at a frequency equal to or higher than the cutoff frequency, and FIG. FIG. 3 is a plan view illustrating a sound field when a frequency equal to or lower than a preset cutoff frequency is reproduced.

First, the circuit configuration of the present embodiment will be described.
To be clear, 5 to 8 are filter circuits L ₁, Filter circuit
L_Two, Filter circuit R_Two, Filter circuit R₁And FIG.
(A) As shown in (c), the filter circuit L₁, R₁Ha
Below the cut-off frequency, weighting is used.
(B) As shown in (d), the filter circuit L_Two, R_TwoHa
It is attenuated below the cut-off frequency.

Furthermore, with the filter circuit L _1, L ₂ L-channel signal is input, the filter circuit L _1, L ₂
Each output side adder 9b of being connected to the input side of the inverting amplifier 10a, the filter circuit R _2, R ₁ together with R channel signal is input, the filter circuit R _2, the output side of R ₁ are respectively inverted The amplifier 10b is connected to the input side of the adder 9c.

9a is an adder whose input side is connected to the filter circuits L ₂ and R ₂ and whose output side is connected to the amplifier 11b of the center speaker 1b. The output side of the adder 9b is the amplifier of the L side speaker 1a. The output side of the adder 9c is connected to the amplifier 11c of the speaker 1c on the R side.

The cutoff frequencies of the filter circuits L ₁ , L ₂ , R ₁ , R ₂ are set as appropriate substantially the same as the frequency at the point where the sound field starts to be affected by the bass range.
Generally, a value between 100 Hz and 200 Hz is selected.

Next, the operation will be described. First, when the frequencies of the L channel signal and the R channel signal are higher than the cutoff frequencies of the filter circuits L ₁ , L ₂ , R ₁ , R ₂ , the filter circuits L ₁ , L ₂ , Since R ₁ and R ₂ have the same gain, the signal of the difference between the L channel signal and the R channel signal is input to the speaker 1a, and the sum of the L channel signal and the R channel signal is input to the speaker 1b, as in the prior art. The signal is input, and the signal of the difference between the R channel signal and the L channel signal is input to the speaker 1c, and the sound field as shown in FIG. 3 is formed stably.

Next, when the frequencies of the L channel signal and the R channel signal are lower than the cutoff frequencies of the filter circuits L ₁ , L ₂ , R ₁ , R ₂ , the filter circuits L ₁ , R ₁ are weighted and L ₂ , R ₁ Since R ₂ is attenuated, the L channel signal becomes a signal weighted by passing through the filter circuit L ₁ , and the R channel signal becomes the filter R ₂
, And becomes a difference signal by the inverting amplifier 10b, and the difference signal between the weighted L channel signal and the attenuated R channel signal is input to the amplifier 11a and output to the speaker 1a.

An L channel signal and an R channel signal are input to the speaker 1b via an amplifier 11b as a sum signal of the signals attenuated by the filter circuits L ₂ and R ₂ , respectively.

[0020] R-channel signal to the speaker 1c is a signal weighted by passing through the filter circuit R _1, L-channel signal is attenuated by the filter L _2, becomes a signal of a difference between the inverting amplifier 10a, weighting the amplifier 11c The signal of the difference between the attenuated R channel signal and the attenuated L channel signal is input to the speaker 1c.
Will be output to

Therefore, the sound field in the low-frequency range below the cut-off frequency of the present embodiment is 2a ', 2b', 2 in FIG.
As shown by c ', the speaker 1a is reproduced with the L channel signal emphasized and reproduced, the speaker 1b is reproduced with the L and R channel signals attenuated, and the speaker 1c is reproduced with the R channel signal emphasized. As described above, a stable sound field can be obtained even in a low frequency range, and it is possible to provide a small speaker device capable of excellent stereo reproduction.

In the above-described embodiment, the difference signal and the sum signal of the L channel signal and the R channel signal are generated and the filter circuits 5, 6, 7, and 8 are described as being provided in the speaker device. The speaker device may be provided in another device and input to the speaker in the speaker device, whereby the speaker device can be further downsized, and such a configuration is also included in the scope of the present invention.

[0023]

The speaker device of the present invention can realize good stereo reproduction even with a single small speaker device by providing the filter circuit as described above.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a speaker device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a frequency characteristic of a filter circuit as an essential part of the embodiment;

FIG. 3 is a plan view illustrating a sound field when a frequency higher than the cutoff frequency is reproduced.

FIG. 4 is a plan view illustrating a sound field when a low-frequency range below the cutoff frequency is reproduced.

FIG. 5 is a plan view illustrating a sound field of a conventional speaker device.

[Explanation of symbols]

1a, 1b, 1c Speaker 5 Filter circuit L ₁ 6 Filter circuit L ₂ 7 Filter circuit R ₂ 8 Filter circuit R ₁ 9a, 9b, 9c Adders 10a, 10b Inverting amplifier

Claims (1)

[Claims] 1. Three speakers are arranged in a horizontal direction so that at least an L channel signal and an R channel signal are input and a reproduced sound is spread, and a difference between the L channel signal and the R channel signal is provided to an L side speaker. A speaker device for inputting a signal, inputting a sum signal of the L channel signal and the R channel signal to a center speaker, and inputting a difference signal between the R channel signal and the L channel signal to an R side speaker. , The L-side loudspeaker passes through the filter means weighting the L-channel signal below the low-frequency cutoff frequency, and the R-side loudspeaker passes through the filter means weighting the R-channel signal below the low-frequency cutoff frequency. Alternatively, a speaker device in which an R channel signal is supplied to the L or R side speaker.