JPH0998499A - Front surround speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge a listening range capable of obtaining an excellent surround effect. SOLUTION: The speaker 16L for reproducing surround signals of a speaker device 11L for a left channel is attached to a box 12L so as to incline the main shaft for a prescribed angle in a counterclockwise direction to the front surface direction of the box 12L. The speaker 16R for reproducing the surround signals of the speaker device 11R for a right channel is attached to the box 12R so as to incline the main shaft for the prescribed angle in a clockwise direction to the front surface direction of the box 12R. Since the main shafts of the speakers 16L and 16R are turned inwards viewing from a listening position on the center line of the speaker devices 11L and 11R, at the listening position deviated from the center line of both speaker devices, a level difference based on the difference of the distance attenuation of the surround signal sound of both left and right channels is corrected by the directivity of the speakers 16L and 16R at intermediate and high frequencies. Thus, the listening range capable of obtaining the excellent surround effect is enlarged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front surround speaker device. Specifically, the surround speakers of the left-channel speaker device and the right-channel speaker device are attached to the speaker box so that their main axes face inward, thereby expanding the listening range in which a good surround effect can be obtained. The present invention relates to a front surround speaker device.

[0002]

2. Description of the Related Art FIG. 7 shows a state in which a conventional front surround speaker device is arranged in a listening room 100. This speaker device is a left channel speaker device 1L.
And a right channel speaker device 1R. For example, the speaker device 1L has an audio signal reproducing speaker for reproducing a left audio signal and a surround signal reproducing speaker for reproducing a surround signal, and the speaker device 1R has an audio signal reproducing speaker for reproducing a right audio signal. It has a surround signal reproducing speaker for reproducing a surround signal.

In this case, a surround signal reproducing speaker
Has its main axis facing the front of the speaker box or its
Speak to face outward at a specified angle to the front
It is attached to the box. Figure 8 shows the speaker
Main units of speakers 2L and 2R for reproducing audio signals of the units 1L and 1R
The axis is the front direction F of the speaker boxes 4L and 4R_L, F_RTo
Surround signal reproduction speakers as well as facing
3L, 3R spindle MA _L, MA_RFront direction F_L, F_RTo
The following shows an example. Further, FIG. 9 shows a speaker device.
1L, 1R audio signal reproduction speakers 2L, 2R spindle
Is the front direction of the speaker boxes 4L and 4R, respectively
F_L, F_RSuitable for surround signal playback
Main axis MA of speakers 3L and 3R_L, MA_RIs the front direction
F_L, F_RAn example of facing outward by a predetermined angle θ with respect to
Is shown.

[0004]

In the above-mentioned conventional front surround speaker device, the original surround effect is obtained when listening at the listening position on the center line M of the speaker devices 1L and 1R shown in FIG. 7, for example, point a. However, when listening at a listening position deviated from the center line M, for example, at the point b, the surround effect is significantly reduced. Hereinafter, the reason why the surround effect remarkably deteriorates at the listening position deviated from the center line M in this way will be described while explaining the principle of the two-channel front surround stereo reproduction system.

This front surround playback system is
A system that obtains a surround effect by using two front speaker devices (speaker devices for left and right channels),
It is a system that produces sound images not only in the forward direction but also in the lateral direction or the backward direction, and creates a wide-angle sound stage sensuously to give the sensation of listening to music in a wide theater, for example. Therefore, the front surround system is a pseudo three-dimensional sound reproduction system that utilizes the sense of hearing, and is distinguished from the orthodox multi-channel three-dimensional sound reproduction system that attempts to create a three-dimensional real sound field in the listening space.

First, the 2-channel stereo signal is composed of an M signal component which is a mono signal and an S signal component which gives a direction of sound image localization. That is, L of the left channel
The signal (left audio signal) is the sum of both M and S components, that is, L = M
+ S, the R signal (right audio signal) of the right channel is M,
The difference between both S components, that is, R = MS. Therefore,
The S signal component is a signal that is the difference between the L signal and the R signal, and is a signal whose magnitude and polarity differ depending on the direction of sound image localization.

That is, the speaker devices 1L and 1R shown in FIG.
At point a on the center line M of the S signal component, the S signal component is zero and the M signal component is only zero when the sound image is localized in the center front, and when the sound image is localized to the left of the center front, the S signal component The polarity has the same positive polarity as the M signal component, and when the sound image is localized to the right of the center front, the polarity of the S signal component has a negative polarity different from the M signal component. Therefore, S =
It can be expressed as ± S _0, and when the sound image is localized to the left of the center front, L = M + (+ S ₀ ) = M + S ₀ , R = M
-(+ S ₀ ) = M−S ₀ , that is, L> R, and when the sound image is localized to the right of the center front, L = M + (−
S ₀ ) = M−S ₀ , R = M − (− S ₀ ) = M + S ₀ , that is, L <R.

Next, in the front surround stereo reproduction system, in addition to the original L and R signals of the two-channel stereo, the surround signal mainly composed of the S signal component is supplied to the L and R signals.
According to the polarity of the S signal component of the signal, a method of electrically superimposing on the L and R signals for reproduction or a method of reproducing using a dedicated speaker is adopted. The S signal component is basically the main component of the surround signal, but in order to produce a more realistic surround effect, signal processing such as time delay, reverberation addition, or emphasizing a specific frequency component is performed on the S signal component. Be seen. In other words, the front surround stereo reproduction system is basically nothing but a system that performs appropriate signal processing on the S signal component contained in the original L and R signals and emphasizes and reproduces more. By adopting such a reproducing method, the center line M of the speaker devices 1L and 1R shown in FIG.
At the listening position above, for example, point a, the intended surround effect is obtained.

Here, the physical acoustic conditions of the reproduced sound at the listening position on the center line M of the speaker devices 1L and 1R, for example, at point a, are M and S emitted from the speaker devices 1L and 1R, and the surround sound. The signal sound components have the same magnitude and reach the same time. This condition is a condition for sensuously reproducing a continuous sound stage between the speaker devices 1L and 1R with both the M and S signal sound components, and for providing an intended surround effect with the surround signal sound components, and is extremely is important. However, the speaker devices 1L and 1R shown in FIG.
At the listening position deviated from the center line M of the above, for example, at the point b, the reproduced sounds of the speaker devices 1L and 1R have a level difference and a time difference, and the above condition is not satisfied.

Furthermore, the speakers 3L dedicated surround signal, when reproducing in 3R (see FIGS. 8 and 9), the speakers 3L, 3R of the main axis MA _L, MA _R is a speaker device 1L, on the center line M of the 1R When viewed from the listening position of, for example, point a, the front direction or the outward direction is faced. As such surround signal reproducing speakers 3L and 3R, small speakers having a diameter of about 8 cm are generally used. In the case of a small speaker having a diameter of about 8 cm, as shown in FIG. 10, the directivity depending on the diameter starts to be attached from a frequency of about 1 kHz, and the directivity becomes sharper as the frequency becomes higher.

Therefore, the surround signal sound at the listening position deviated from the center line M of the speaker devices 1L and 1R shown in FIG. 7, for example, at the point b has directivity due to the difference in the direction and the distance of the speaker devices 1L and 1R. The right channel side is large and the left channel side is small due to the difference in the distance attenuation of the sound waves. In particular, when the main axes of the surround signal reproduction speakers 3L and 3R face outward (see FIG. 9), the level difference due to the directivity of the left and right surround signal sounds is
It becomes even more remarkable. Therefore, as described above, the surround effect at the listening position deviated from the center line M of the speaker devices 1L and 1R in FIG.

Therefore, the present invention provides a front surround speaker device capable of expanding the listening range in which a good surround effect can be obtained.

[0013]

In a front surround speaker device according to the present invention, a speaker for reproducing a surround signal of a speaker device for a left channel and a speaker device for a right channel has respective main axes with respect to a front direction of a speaker box. The speaker box is attached to the speaker box so as to be tilted counterclockwise and clockwise by a predetermined angle.

The main axis of the speaker that reproduces the surround signals of the left and right channel speaker devices is
It faces inward as viewed from the listening position on the center line of both speaker devices. Therefore, at a listening position that is off the center line of both speaker devices, the level difference based on the difference in the distance attenuation of the surround signal sound of the left and right channels is corrected by the directivity of the middle and high frequencies of the speaker that reproduces the surround signal. , The listening range where a good surround effect is obtained is expanded.

[0015]

First, a first embodiment of the present invention will be described. FIG. 1 shows a front surround speaker device 10 as a first embodiment, and this speaker device 10 comprises a left channel speaker device 11L and a right channel speaker device 11R.

The speaker device 11L is of a two-way type in which a woofer 13L and a tweeter 14L, which constitute a speaker for reproducing an audio signal, are attached to the front surface of a speaker box 12L having a substantially rectangular parallelepiped shape. Woofer 13
The speaker box 1 and the tweeter 14L are so arranged that their main axes face the front of the speaker box 12L.
It is attached to the front side of 2L. Further, the speaker box 12L has a speaker mounting surface 15L formed by cutting off an upper part of a corner formed by the front surface and the right side surface thereof, and the surround signal reproducing speaker 16L is mounted on the mounting surface 15L. In this case, the speaker 16L, as shown in FIG. 2, the main axis MA _L speaker box 12L
The predetermined angle α with respect to the front direction F _L counterclockwise in, attached to the speaker box 12L to be inclined for example by 40 ° to 50 °.

The speaker device 11R is of a two-way type in which a woofer 13R and a tweeter 14R constituting a speaker for reproducing an audio signal are mounted on the front surface of a speaker box 12R having a substantially rectangular parallelepiped shape. Woofer 13
The speaker box 1 and the tweeter 14R are so arranged that their main axes face the front of the speaker box 12R.
It is attached to the front side of 2R. Further, the speaker box 12R has a speaker mounting surface 15R formed by cutting off an upper part of a corner formed by the front surface and the left side surface, and the surround signal reproducing speaker 16R is mounted on the mounting surface 15R. In this case, the speaker 16R, as shown in FIG. 2, the main axis MA _R speaker box 12R
The speaker box 1 is tilted by a predetermined angle α, for example, 40 ° to 50 °, with respect to the front direction F _R of the speaker box 1.
It is attached to 2R.

In the front surround speaker device 10 shown in FIG. 1, the main axis MA of the speakers 16L and 16R is
_L, MA _R are inclined speaker box 12L respectively, the front direction F _L of 12R, counterclockwise with respect to F _R, in a clockwise direction by a predetermined angle alpha. Therefore, the speaker 16L,
Main axis MA _L of 16R, MA _R is a speaker apparatus 11L, 1
Looking inward from the listening position (see FIG. 2) on the center line M of the 1R, it faces inward.

Generally, the S signal component, which is the main component of the surround signal, is a signal whose main component is in the middle and high frequencies. Moreover, since the diaphragms of the speakers 16L and 16R have a finite area, as shown in FIG.
At high frequencies, the emitted sound wave itself has directivity.

Therefore, as described above, the speaker 16
L, the main axis MA _L of 16R, by the MA _R is to face inward, listening position deviated from the center line M, for example, b
At the point (see FIG. 7), the level of the surround signal sound of the right channel decreases and the level of the surround signal sound of the left channel slightly increases, and the level difference based on the difference in the distance attenuation of the surround signal sounds of the left and right channels is corrected. To be done.
Therefore, the front surround speaker device 1 shown in FIG.
According to 0, the listening range where a good surround effect can be obtained can be expanded.

The present applicant conducted a hearing test in order to confirm that the listening range in which the favorable surround effect is obtained in the front surround speaker device 10 as shown in FIG. 1 is widened as described above. FIG. 3 shows a speaker device 20 used as a left channel speaker device and a right channel speaker device in this hearing test. The speaker device 20 is the speaker device 2
The speaker device 25 is arranged on the upper part of 1.
The speaker device 21 has a width of 20 cm and a depth of 22 c.
m, height = 30 cm, speaker box 22 has a woofer 23 with a diameter of 14 cm and a diameter of 8 cm for audio signal reproduction
2 way type in which the tweeter 24 is attached, and the reproduction band is 50 Hz to 20 kHz. The speaker device 25 has a width of 9 cm and a depth of 7 c.
A surround signal reproduction speaker 27 having a diameter of 8 cm is attached to a closed speaker box 26 having a height of 9 cm and a height of 9 cm, and a reproduction band is 300 Hz to 20 k.
Hz.

The speaker device 20 shown in FIG. 3 is used as a left channel speaker device and a right channel speaker device, and is placed in a listening room 100 having a reverberation time of about 0.2 seconds in the state shown in FIG. I went. Then, in the listening test, the main axes (reference axes) of the woofer 23 and the tweeter 24 of the speaker device 21 that constitute the speaker device 20 for the left channel and the channel for the right channel are directed in the front direction (parallel to the side wall of the listening room 100). In this state, when the main axis of the speaker 27 of the speaker device 25 is directed outward by 30 °, when the main axis of the speaker 27 of the speaker device 25 is directed to the front direction, the speaker 27 of the speaker device 25 is
The listening range in which a good surround effect was obtained was obtained when the main axis of was oriented inward by 45 °.

In FIG. 4, the broken line L _-1 indicates the boundary of the listening range in which a good surround effect can be obtained when the main axis of the surround signal reproducing speaker 27 is directed outward by 30 °. _In the range closer to the center line M than _-1 , a good surround effect was obtained. Further, the alternate long and short dash line L _-2 indicates the boundary of the listening range where a good surround effect can be obtained when the main axis of the speaker 27 is directed in the front direction,
A good surround effect was obtained in a range closer to the center line M than the dashed-dotted line L _-2 . In this case, the listening range in which a good surround effect can be obtained is slightly expanded as compared with the case where the main axis of the speaker 27 is directed outward by 30 °.

[0024] In contrast, the solid line L _-3 shows the boundaries of the hearing range of good surround effect is obtained when the inwardly a main axis of the loudspeaker 27 by 45 °, from the solid line L _-3 A good surround effect was obtained in the range on the center line M side. In this case, the listening range in which a good surround effect can be obtained is further expanded as compared with the case where the main axis of the speaker 27 is directed in the front direction. As a result, it was confirmed that the front surround speaker device 10 as shown in FIG. 1 can expand the listening range where a good surround effect can be obtained.

Next, a second embodiment of the present invention will be described. FIG. 5 shows a front surround speaker device 30 as a second embodiment, and this speaker device 30 is composed of a left channel speaker device 31L and a right channel speaker device 31R.

A speaker mounting surface 33L is formed between the front surface and the right side surface of the speaker box 32L constituting the speaker device 31L. Then, the speaker device 31L is
The speaker mounting surface 33L is a two-way type in which a woofer 34L and a tweeter 35L are mounted. The woofer 34L and the tweeter 35L function not only as a speaker for reproducing an audio signal but also as a speaker for reproducing a surround signal. In this case, woofer 3
4L and the tweeter 35L, as shown in FIG. 6, the speaker box so that the main axis MA _L is inclined by the front direction F _L predetermined angle β in a counterclockwise direction with respect to, for example, 40 ° to 50 ° of the speaker box 32L It is attached to 32L.

A speaker mounting surface 33R is formed between the front surface and the left side surface of the speaker box 32R which constitutes the speaker device 31R. Then, the speaker device 31
R is a 2-way type in which a woofer 34R and a tweeter 35R are attached to the speaker attachment surface 33R. The woofer 34R and tweeter 35R are
Besides functioning as a speaker for reproducing audio signals, it also functions as a speaker for reproducing surround signals. In this case, the woofer 34R and tweeter 35R, as shown in FIG. 6, the predetermined angle β in the clockwise direction its major axis MA _R is with respect to the front direction F _R of the speaker box 32R, for example 40 ° to
It is attached to the speaker box 32R so as to be inclined by 50 °.

In the front surround speaker device 30 shown in FIG. 5, the main shafts M of the speakers (34L, 35L), (34R, 35R) for reproducing the surround signal.
A _L, MA _R each speaker box 32L, 32R
Counterclockwise in the front direction F _L, with respect to F _R, is inclined clockwise by a predetermined angle beta. Therefore, the speaker (34
L, 35L), the main axis MA _L of (34R, 35R), MA _R
Is facing inward when viewed from the listening position (see FIG. 6) on the center line M of the speaker devices 31L and 31R. for that reason,
Similar to the front surround speaker device 10 shown in FIG. 1, at the listening position deviated from the center line M of the speaker devices 31L and 31R, the speakers (34L and 35L),
The level difference based on the difference in the distance attenuation of the left and right surround signal sounds from (34R, 35R) is corrected,
The listening range in which a good surround effect is obtained can be expanded.

In the above embodiment, the example of the 2-way type speaker device is shown, but it goes without saying that the present invention is not limited to this type. In short,
Speakers for reproducing surround signals of the left-channel speaker device and the right-channel speaker device are attached to the speaker box so that their main axes are inclined by a predetermined angle in the counterclockwise direction and the clockwise direction with respect to the front direction of the speaker box. It is in.

[0030]

According to the present invention, the main axes of the speakers for reproducing the surround signals of the left and right channel speaker devices face inward when viewed from the listening positions on the center lines of both speaker devices. At a listening position that is off the center line of the speaker device, the level difference based on the difference in the distance attenuation of the surround signal sound of both left and right channels is corrected by the directivity of the middle and high frequencies of the speaker that reproduces the surround signal, and therefore it is good. You can expand the listening range where a great surround effect can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a front surround speaker device according to a first embodiment.

FIG. 2 is a diagram showing a direction of a main axis of a speaker that reproduces a surround signal.

FIG. 3 is a perspective view showing a speaker device used for a hearing test.

FIG. 4 is a diagram showing the results of a hearing test and the like.

FIG. 5 is a perspective view showing a front surround speaker device according to a second embodiment.

FIG. 6 is a diagram showing a direction of a main axis of a speaker that reproduces a surround signal.

FIG. 7 is a diagram showing a conventional front surround speaker device.

FIG. 8 is a diagram showing an example in which a main axis of a surround signal reproducing speaker faces a front direction.

FIG. 9 is a diagram showing an example in which a main axis of a surround signal reproducing speaker faces outward.

FIG. 10 is a diagram showing an example of output sound pressure directional frequency characteristics of a speaker.

[Explanation of symbols]

 10, 30 Front surround speaker device 11L, 31L Left channel speaker device 11R, 31R Right channel speaker device 12L, 12R, 32L, 32R Speaker box 13L, 13R, 34L, 34R Woofer 14L, 14R, 35L, 35R Tweeter 15L, 15R, 33L, 33R Speaker mounting surface 16L, 16R Surround signal reproduction speaker

Claims (3)

[Claims] 1. A front surround speaker device comprising a speaker device for a left channel and a speaker device for a right channel, each of which has a speaker for reproducing a surround signal, wherein a surround signal of the speaker device for a left channel and a speaker device for a right channel are reproduced. A front surround speaker device, wherein each speaker is attached to the speaker box such that its main axis is tilted by a predetermined angle in the counterclockwise direction and the clockwise direction with respect to the front direction of the speaker box. 2. The front surround speaker device according to claim 1, wherein the predetermined angle is 40 ° to 50 °. 3. The left channel speaker device serves as both a speaker for reproducing the surround signal and a left audio signal, and the right channel speaker device has a speaker for reproducing the surround signal and a right audio signal. The front surround speaker device according to claim 1, which is also used as a speaker for reproducing a signal.