JPH06308977A - Soundproof partition - Google Patents

Abstract

PURPOSE:To prevent deterioration in the work efficiency caused by a noise. CONSTITUTION:The partion is provided with a sound sensible part 40 for outputting in accordance with received acoustic pressure, an acoustic output part 42 for outputting a white noise, and a sound volume control part 41 for controlling the sound volume of the acoustic output part in accordance with the output of the sound sensible part. Also, the sound volume control part 41 recognizes an original noise level obtained by eliminating a portion by the white noise from the output of the sound sensible part, and also, changes a control operation of the sound volume of the acoustic output part in accordance with a level range to which the original noise level belongs, and the control operation is divided into at least a first control operation and a second control operation, so that a first control operation is an operation for setting the sound volume the white noise to a prescribed value determined in advance, when the original noise level is changed within a first control operation range, and a second control operation is an operation for increasing the sound volume of the white noise, when the original noise level shows an increase tendency within a second control operation range, and decreasing the sound volume of the white noise, when its level shows a decrease tendency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof partition which can prevent a decrease in concentration of a person.

[0002]

2. Description of the Related Art In order to improve the working environment, a noise-free space is required, and the soundproof performance of the sash (window frame) is improved, and a carpet with excellent sound absorption has been spread over the floor. As a result, in office buildings in recent years, the space is quiet due to the acoustically dead state (high average room sound absorption rate). Noises such as (significant noise) can now be heard clearly. Therefore, even though the background noise is low and the space is quiet, the concentration is rather reduced and the work efficiency is reduced. To alleviate this loss of concentration due to silence, surround each individual's work space with tall (floor-to-ceiling) partitions to provide significant noise (meaning for humans, such as speaking). The method of blocking the noise) was adopted.

[0003]

However, in modern office buildings, it is often the case that partitions with only a low height are used to emphasize the feeling of space openness, and a tall partition with sound insulation is taken into consideration. Is less often installed. In other words, in recent years, there has been a problem that the tendency for concentration to be reduced has become more noticeable in spite of being a quiet space.

The present invention has been made in order to solve the above problems, and an object of the present invention is to reduce the work efficiency without significantly impairing the feeling of opening the space and by significantly clarifying the noise. It is to provide a soundproof partition that can be prevented.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a sound-sensing section for outputting in accordance with the sound pressure received and a white noise for outputting according to the invention. And a volume control unit that adjusts the volume of the sound output unit according to the output of the sound sensing unit.

According to another aspect of the present invention, the volume control section recognizes an original noise level obtained by removing the output of the white noise from the output of the sound sensing section, and at the same time, detects the original noise level. The adjustment operation of the sound volume of the sound output unit is changed according to the level range to which it belongs. The adjustment operation is divided into at least a first control operation and a second control operation, and the first control operation is the original control operation. If the noise level changes within the first control operation range, it is a control operation for setting the volume of the white noise to a predetermined value, and the second control operation is within the second control operation range. If the noise level shows an increasing tendency, the volume of the white noise is increased, and if it shows a decreasing direction, the volume of the white noise is decreased.

[0007]

With the above construction, according to the invention of claim 1, significant noise can be masked by white noise when the original noise level is high.

According to the second aspect of the present invention, significant noise can be masked by white noise when the original noise level is high, and auditory hypersensitivity when the original noise level is too low and quiet. White noise can be supplied so that it does not become

[0009]

FIG. 1 shows an embodiment of a soundproof partition according to the present invention.
~ It will be described in detail with reference to FIG. FIG. 1 is a perspective view showing a soundproof partition, FIG. 2 is a sectional view showing a lower structural member of the soundproof partition, and FIG. 3 is a graph for explaining control characteristics of a volume control unit of the soundproof partition.

As shown in FIG. 1, the soundproof partition 1 is composed of an upper structural member 2 and a lower structural member 3 which are separated from the substantially center, and is a rectangular plate-like member having a height of about 150 cm as a whole. is there. The upper structural member 2 includes a microphone 40 corresponding to a sound sensing unit, a volume control unit 41, and a sound output unit 42. The lower structural member 3 includes speakers 43, 43. The microphone 40 is attached to the upper surface of the upper structural member 2, and the volume control unit 41 and the sound output unit 42 are incorporated in the upper structural member 2, respectively. Speaker 4
Reference numerals 3 and 43 are fitted in the lower structural member 3 in the vicinity of the left and right sides, respectively. The microphone 40 is connected to the volume control unit 41, the volume control unit 41 is connected to the sound output unit 42, and the sound output unit 42 is connected to the speakers 43, 43.

As the upper structural member 2, a panel member made of wood or synthetic resin similar to the conventional one is used. Lower structure material 3
Is a soundproof structural material having a structure as shown in FIG.
That is, the lower structural material 3 includes a surface finishing layer 30, a sound deadening layer 31, a first sound absorbing layer 32, a second sound absorbing layer 33, a sound insulating layer 34, a base layer 35, and a back surface finishing layer 36. It is formed by doing. As the front surface finishing layer 30 and the back surface finishing layer 36, cloth made of a warm material is used. As the sound deadening layer 31, an aluminum sintered porous panel is used. The aluminum sintered porous panel silences high frequency components by diffusion and resonance. Glass wool is used as the first sound absorbing layer 32. A substantially hollow air layer is used as the second sound absorbing layer 33. The glass wool and the air layer absorb all frequency components of the sound substantially uniformly. A lead-containing sheet is used as the sound insulation layer 34. The lead-containing sheet has excellent sound insulation. A steel plate is used as the underlayer 35.

By the way, the microphone 40 receives ambient noise and converts it into an electric quantity according to the sound pressure, and the volume control section 41.
Is output to. The volume control unit 41 sequentially adjusts the volume of the white noise output by the sound output unit 42 based on the amount of electricity output by the microphone 40. The sound output unit 42 includes a white noise generation unit (not shown) and an amplification unit (not shown) that causes white noise to be produced by the speakers 43, 43. The amplification factor of the amplification section of the sound output section 42 is controlled by the volume control section 41. The white noise is about 500.
It is an involuntary noise that contains each frequency component substantially uniformly in the range of Hz to 2000 Hz.

After the soundproof partition 1 as described above is constructed, the following initial settings are made by using a sound level meter (not shown), and the following operations are performed. That is, a sound level meter is installed at a location (point P _1.5m ) approximately 1.5 m away from the microphone 40 and the speakers 43, 43. Then, by selecting a time when the site noise is low, the control output value Y of the volume control unit 41 is changed (the volume of white noise output from the speakers 43, 43 is changed), and the indicated value of the sound level meter is 50 dB ( The control output value Y ₅₀ of the sound volume control unit 41 in the case of A) and the control output value Y ₆₀ of the sound volume control unit 41 in the case of the indicated value of the sound level meter becoming 60 dB (A) are stored in the sound volume control unit 41. Let them do it.
Then, the initial setting is completed. The volume control unit 41, which has completed the initial setting, learned how white noise output from the speakers 43, 43 affects the amount of electricity output from the microphone 40.

After the learning, the volume control unit 41 controls the volume control unit 41 to output when the noise value X _{w at} the point P _1.5m due to the white noise output from the speakers 43, 43 is designated. Calculate the output value Y _Xw ,
The control output value Y _Xw can be output to the sound output unit 42. In addition, the volume control unit 41 after learning has no noise value X _w due to the white noise output from the speakers 43 and 43 and the white noise output from the speakers 43 and 43 in the amount of electricity output from the microphone 40. It is by synthesis of the noise values X _a (original noise level) in the state, and to recognize the noise value X _a from the quantity of electricity output from the microphone 40.

Soundproof partition 1 after learning as described above
Performs the following basic operations. That is, the volume control unit 41 obtains the original noise value X _a from which the noise value X _w resulting from the white noise output from the speakers 43, 43 is removed from the amount of electricity output by the microphone 40, and the noise that changes with time is obtained. The value X _a is divided for each sampling period T, and the average noise value M _T (X _a ) of the noise value X _a within the sampling period T is calculated. Then, the volume control unit 41 obtains the control output value Y to be output to the sound output unit 42 by the processing method according to the value of the average noise value M _T (X _a ), and the control output value Y is output during the next sampling period T. The calculated control output value Y is output to the sound output unit 42. The sampling period T is set to about 10 msec.

By the way, the above-mentioned average noise value M
_As a processing method for obtaining the control output value Y to be output to the sound output unit 42 according to _T (X _a ), the volume control unit 41 includes the following compensation control operation corresponding to the first control operation, The masking control operation corresponding to the two-control operation and the non-control operation can be performed.

Compensation control operation means that if the original noise value X _a is in _a range of α ≦ X _a <β corresponding to the first control operation range, the volume control unit 41 determines the noise value X at the point P _{1.5 m} .
_This is an operation of outputting the control output value Y ₂₀ such that _w becomes 20 dB (A) to the sound output unit 42.

The masking control operation is the original noise value X
_aCorresponds to the second control operation range γ ≦ X_aIn the range of <δ
If there is, the volume control unit 41 points P_1.5mNoise in
Value X _wIs the original noise value X_a5 dB (A) lower than
With the operation of outputting the control output value Y as described above to the sound output unit 42,
is there.

Uncontrolled operation means that the original noise value X _a is ε ≦
In the range of X _a <ζ, the volume control unit 41 continues the previous control output value Y to the sound output unit 42 when the immediately previous sampling result is the compensation control operation or the masking control operation. When the output is performed and the immediately previous sampling result is the uncontrolled operation, the output of the white noise from the speakers 43 and 43 is eliminated (noise value X _w = −∞ dB).
It is an operation of outputting the control output value Y as (A) to the sound output unit 42.

Next, an embodiment of the operation of the soundproof partition 1 will be specifically described with reference to FIG. However, in the example of FIG. 3, the compensation control operation range is set to X _a <20 dB (A), and the masking control operation range is 25 dB (A) ≦.
X _a <35 dB (A), and the range of uncontrolled operation is 20 dB (A) ≦ X _a <25 dB (A) and 35 dB.
(A) ≦ X _a is set. Also, speaker 4
The maximum change width of the noise value X _w at one time caused by the white noises output by 3, 43 at the point P _1.5m is set to 25 dB (A) at the time of increase and 10 dB (A) at the time of decrease. The horizontal axis is the time axis, and the vertical axis is the noise value X at the point P _1.5m . Note that time t
_The sampling operation starts from ₀ .

In FIG. 3, the sampling period T (t ₀
During the period from t 1 to t ₁ ), there is no data of the average noise value M _T (X _a ) of the original noise value X _{a in} the immediately preceding sampling period T, so white noise is not output from the speakers 43, 43, and white noise is not output. The noise value X _w due to noise does not exist and the average noise value M of the original noise value X _a
T0,1 (X _a ) indicates that it is _{16 dB} (A).

During the sampling period T (t ₁ -t ₂ ), the average noise value M _T0,1 (X _a of the original noise value X _a during the immediately preceding sampling period T (t ₀ -t ₁ ). ) Is 1
Since it belongs to the range of compensation control operation at 6 dB (A),
From the speaker 43 together with noise value X _w due to white noise is output white noise volume such that 20 dB (A), the average noise value M of the original noise value X _{a T1,2} (X _a ) indicates that it is 23 dB (A). Further, the noise value _Xa and the noise value X immediately after the time t ₁
The combined noise value X with _w is approximately 23 dB (A), and at time t
It is shown that the combined noise value X of the noise value X _a and the noise value X _w at the _two points is about 24.8 dB (A).

During the sampling period T (t _{2 to} t ₃ ), the average noise value M _T1,2 (X _a of the original noise value X _a during the immediately preceding sampling period T (t _{1 to} t ₂ ). ) Is 2
Since it belongs to the range of uncontrolled operation at 3 dB (A), the loudspeaker 43, 43 outputs white noise with a volume such that the noise value X _w due to white noise becomes 20 dB (A), and It shows that the average noise value M _T2,3 (X _a ) of the original noise value X _a is 30 dB (A). In addition, immediately after the time t ₂ noise value X _a and the noise value X _w
Indicates that the combined noise value X of and is about 30.4 dB (A), and the combined noise value X of the noise value X _a and the noise value X _w at time t ₃ is about 30.4 dB (A). ing.

During the sampling period T (t _{3 to} t ₄ ), the average noise value M _T2,3 (X _a of the original noise value X _a during the immediately preceding sampling period T (t _{2 to} t ₃ ). ) Is 3
Since it belongs to the range of the masking control operation at 0 dB (A), the loudspeaker 43, 43 outputs white noise with a volume such that the noise value X _w due to the white noise becomes 25 dB (A). Original noise value X _a
The average noise value M _T3,4 (X _a ) is 34 dB (A). Also, synthetic noise value X of the noise values X _a and noise value X _w immediately after time t ₃ is approximately 34.2dB (A), the synthesis of the noise values X _a and noise value X _w of the time t ₄ when The noise value X indicates that it is approximately 34.5 dB (A).

During the sampling period T (t _{4 to} t ₅ ), the average noise value M _T3,4 (X _a of the original noise value X _a during the immediately preceding sampling period T (t _{3 to} t ₄ ). ) Is 3
Since it belongs to the range of the masking control operation at 4 dB (A), the loudspeaker 43, 43 outputs white noise with a volume such that the noise value X _w due to the white noise becomes 29 dB (A). Original noise value X _a
The average noise value M _T4,5 (X _a ) of the above is 27 dB (A). The time t ₄ Synthesis noise value X of the noise values X _a and noise value X _w immediately is approximately 29.1dB (A), the synthesis of the noise values X _a and noise value X _w of the time t ₅ when The noise value X indicates that it is approximately 31.1 dB (A).

During the sampling period T (t _{5 to} t ₆ ), the average noise value M _T4,5 (X _a of the original noise value X _a during the immediately preceding sampling period T (t _{4 to} t ₅ ). ) Is 2
Since it belongs to the range of the masking control operation at 7 dB (A), the loudspeaker 43, 43 outputs white noise with a volume such that the noise value X _w due to the white noise becomes 22 dB (A), and Original noise value X _a
The average noise value M _T5,6 (X _a ) is 21 dB (A). Also, synthetic noise value X of the noise values X _a and noise value X _w immediately after time t ₅ is approximately 29.6dB (A), the synthesis of the noise values X _a and noise value X _w of the time t ₆ when The noise value X indicates that it is approximately 24.5 dB (A).

During the sampling period T (t _{6 to} t ₇ ), the average noise value M _T5,6 (X _a of the original noise value X _a during the immediately preceding sampling period T (t _{5 to} t ₆ ). ) Is 2
Since it belongs to the range of uncontrolled operation at 1 dB (A), the loudspeaker 43, 43 outputs white noise with a volume such that the noise value X _w due to white noise becomes 22 dB (A), and The average noise value M _T6,7 (X _a ) of the original noise value X _a is 36 dB (A). In addition, immediately after the time t ₆ noise value X _a and the noise value X _w
It is shown that the combined noise value X of and is about 36.2 dB (A), and the combined noise value X of the noise value X _a and the noise value X _w at time t ₇ is about 36.2 dB (A). ing.

During the sampling period T (t _{7 to} t ₈ ), the average noise value M _T6,7 (X _a of the original noise value X _a during the immediately preceding sampling period T (t _{6 to} t ₇ ). ) Is 3
Since 6 dB (A) belongs to the range of uncontrolled operation, the output of white noise from the speakers 43, 43 is about to be stopped, but the maximum change width of the noise value X _w at one time is 10 dB when it decreases. Since it is set to (A), the loudspeakers 43, 43 output white noise with a volume such that the noise value X _w due to white noise is 12 dB (A), and the original noise value X _a. The average noise value M _T7,8 (X _a ) is 33 dB (A). Also, synthetic noise value X of the noise values X _a and noise value X _w immediately after time t ₇ is approximately 33.3dB (A), the synthesis of the noise values X _a and noise value X _w of the time t ₈ when The noise value X indicates that it is approximately 33.0 dB (A).

Thereafter, the same operation is sequentially repeated.
It That is, in FIG.₁(Shown with shading
The solid line on the side is point P_1.5mThe synthetic noise value X in
Then L ₂(The lower solid line shown by shading) is point P_1.5m
Noise level X at_aIndicates L ₃(Dotted line) is the point
To P_1.5mNoise level X at_wIs shown. Therefore, the figure
As can be seen from 3 as well, according to the soundproof partition 1,
Annoying 20 to 35 dB (A) significant noise white
You can mask it with noise so you don't bother
Is.

In the soundproof partition described above, each control operation range is divided, the volume condition of white noise output by the audio output section during each control operation, and the white output by the audio output section during each control operation. The maximum permissible change condition of the noise volume, etc. can be set and adjusted according to the installation situation of the soundproof partition.

[0031]

Since the soundproof partition of the present invention is constructed as described above, in the invention of claim 1, the work efficiency can be lowered because the speech and footsteps can be masked by white noise. In addition, in addition to the above effects, the invention according to claim 2 is suitable for work in which white noise can be supplied so as not to be auditory hypersensitivity when the work efficiency is too quiet and the work efficiency decreases. It has the effect of providing an excellent soundproof partition that creates an acoustic environment.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a soundproof partition according to the present invention.

FIG. 2 is a cross-sectional view showing a lower structural member of the above embodiment.

FIG. 3 is a graph illustrating the control characteristic of the volume control unit of the above-described embodiment.

[Explanation of symbols]

 1 Soundproof Partition 40 Sound Sensing Section 41 Volume Control Section 42 Sound Output Section

Front page continuation (72) Minor Kanda 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works Co., Ltd. (72) Hiroshi Hatano, 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Works, Ltd. (72) Invention Person Koji Nakagawara 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (2)

[Claims] 1. A sound-sensing unit that outputs according to the sound pressure received, a sound output unit that outputs white noise, and a volume control unit that adjusts the sound volume of the sound output unit according to the output of the sound-sensing unit. A soundproof partition characterized by including and. 2. The volume control section recognizes an original noise level obtained by removing the output of the white noise from the output of the sound sensing section and outputs the acoustic output according to the level range to which the original noise level belongs. The adjustment operation of the volume of the part is changed, and the adjustment operation is divided into at least a first control operation and a second control operation, and the first control operation has the original noise level within the first control operation range. Is a control operation for setting the volume of the white noise to a predetermined value, and the second control operation is performed if the original noise level shows an increasing tendency within the second control operation range. 2. The soundproof partition according to claim 1, wherein the control operation is a control operation of increasing the volume of white noise and decreasing the volume of the white noise if a decreasing direction is indicated.