JPH06167987A - Noise controller - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to effectively prevent situations such as forgetting to turn off the power after using the device, and to save energy. [Structure] When the user wants to perform a mute operation, the user turns on the power switch 4. As a result, electric power is supplied to each unit of the device, and the noise control unit 2 causes the noise observation unit 1 to operate.
Based on the level of the noise signal x from, for example, at the control point P, a signal s that cancels noise is generated, and a secondary sound corresponding to this signal s is output from the secondary sound source unit 3,
Performs muffling processing. When the power switch 4 is on and such a silencing operation is performed, the pilot lamp 6 is lit. When the user does not need to make the device perform the muffling operation, the pilot lamp 6
With this display, it is possible to remember to turn off the power switch 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise control device for controlling a noise by generating a sound that cancels the noise as a secondary sound.

[0002]

2. Description of the Related Art In recent years, so-called active control has been attempted to reduce the noise level by outputting an artificial secondary sound having the same amplitude and opposite phase as the noise. "Construction of an electronic muffling system for air-conditioning ducts using adaptive digital filters" IEICE Technical Committee Report EA87-7, describes a technology for muffling air-conditioning duct noise using adaptive digital filters. ing.

[0003]

By the way, in this type of noise control device, the noise is canceled after the noise control device is actuated. You can not generally know. Therefore, even when the surrounding environment is in a state where the noise is extremely low, it is mistakenly recognized that this is due to the control of the noise control device, and the noise control device does not need to be operated, There is a problem that the noise control device continues to operate. Further, since the silencing operation is generally performed without being noticed by the user, the user sometimes forgets to turn off the power after using the noise control device.

According to the present invention, it is possible to continue operating the device even though it is not necessary to operate the device, or to forget to turn off the power after using the device. It is an object of the present invention to provide a noise control device that can be effectively prevented and can save energy.

[0005]

In order to achieve the above object, the invention according to claim 1 is a noise observing means for observing noise in a noise generating source and a noise observing means in order to perform a silencing operation. And a secondary sound source means for generating a secondary sound for noise control according to the signal resulting from the signal processing by the signal processing means. It is characterized in that display means for displaying the operating state is provided. By displaying the operation state of the device by the display means, the user can be made aware of the operation state of the device, and particularly when a pilot lamp is used as the display means, energy saving is achieved with a very simple device configuration. be able to.

According to the second aspect of the invention, the user observing means for detecting the presence or absence of the user and the muffling operation are performed only while the user observing means senses the presence of the user. An operation control means for controlling the operation of the apparatus is provided. The presence or absence of a user is detected by the user observation means, and the muffling operation is performed only while the presence of the user is detected by the user observation means, thereby stopping the muffling operation while there is no user of the device. Therefore, it is possible to effectively save energy.

Further, the invention according to claim 3 is provided with operation control means for controlling the operation of the device so that the noise observing operation is performed only during the period when the noise observing means senses noise equal to or higher than a predetermined threshold value. It is characterized by being. By performing the muffling operation only during the period when noise above a predetermined threshold is sensed, the muffling operation can be stopped while the sound is so small that it is not necessary to mute it, and energy saving can be effectively achieved. .

The invention according to claim 4 is characterized in that the predetermined threshold value can be variably set. As a result, the user can set this threshold to a value suitable for himself or herself, and can flexibly deal with the difference in noise level felt by a plurality of users.

The invention according to claim 5 is characterized in that the predetermined threshold value is set to a lower limit value at which effective silencing can be performed. As a result, the noise level can be uniformly determined according to the purpose of the space where the noise reduction is performed (in the factory, office, conference room, etc.), and the user does not muffle the noise more than necessary. Can be achieved.

Further, the invention according to claim 6 is an operation control means for controlling the operation of the device in cooperation with the switch of the noise generating source so that the noise canceling operation is performed only during the period when the switch of the noise generating source is turned on. Is provided. The operation control means interlocks with the noise source switch to perform the muffling operation only while the noise source is switched on. Therefore, the mute operation should be performed only while noise is being generated. Therefore, it is possible to effectively save energy.

Further, the invention according to claim 7 is provided with operation control means for controlling the operation of the apparatus so that the silencing operation is stopped when a predetermined time has elapsed after the silencing operation is started. It has a feature. The operation control means is
After starting the muffling operation, the silencing operation is stopped when a preset time has elapsed, so that it is possible to reliably prevent forgetting to turn off the power supply, and to achieve reliable energy saving. Further, since it is only necessary to first push the switch once, it is suitable for use by an unspecified number of users.

Further, the invention according to claim 8 is provided with a switch operated by a user, and an operation control means for controlling the operation of the apparatus so that the mute operation is performed only while the switch is pressed. It is characterized by being. Since the operation control means performs the mute operation only while the switch is being pressed, it is possible to prevent forgetting to turn off the power supply, and it is possible to reliably save energy with a simple configuration.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In the following, for convenience of description, the noise control device is applied to an air conditioning duct to cancel the noise of the air conditioning duct.

FIG. 1 is a block diagram of a first embodiment of a noise control device according to the present invention. The noise control device of the first embodiment is based on a noise observation section 1 such as a microphone for observing noise in the air conditioning duct 50 as a noise generation source, and a noise signal x observed by the noise observation section 1. Control signal s
Of the noise control signal, a secondary sound source unit 3 such as a speaker that generates a secondary sound corresponding to the noise control signal s, and a power switch 4 that controls power supply to each unit. is doing. Here, a known technique can be used for the noise control unit 2, and in the example of FIG. 1, the noise control unit 2 performs A / D conversion for converting the noise signal x from the noise observation unit 1 into a digital signal. 51, an adaptive digital filter (for example, FLR filter) 52 that applies a predetermined signal processing to the signal from the A / D converter 51 by applying an adaptive control algorithm such as an LMS algorithm, and an adaptive digital filter 52.
A D / A converter 53 for converting the output signal from the D / A converter 53 into an analog signal, and an amplifier 54 for amplifying the analog signal from the D / A converter 53 and giving it to the secondary sound source section 3 as a noise control signal s. Has been done.

By the way, the noise control apparatus of the first embodiment is further provided with a display section 6 for displaying the power supply state. For this display unit 6, for example, a pilot lamp is used which is turned on when power is being supplied to each unit (that is, when the device is in the mute operation state) and is turned off when power supply is stopped.

In the noise control device of the first embodiment having such a structure, the user turns on the power switch 4 when he / she wants the device to perform the silencing operation. As a result, electric power is supplied to each unit, and the noise control unit 2 carries out the silencing operation. That is, the noise control unit 2 uses, for example, a signal that cancels noise at the control point P based on the level of the noise signal x from the noise observation unit 1 in a manner similar to that described in the above-mentioned document. s is generated, the secondary sound corresponding to this signal s is output from the secondary sound source unit 3, and the muffling process is performed. As a result, at the control point P, the noise is canceled by the secondary sound, and the user can work in a quiet environment. In the air conditioning duct 50,
Since the noise (sound wave) propagates one-dimensionally as shown by arrow A in FIG. 1, the noise is canceled even if it is placed at a point prior to the control point P, and the user can work in a quiet environment. Can be done.

Further, when such a silencing operation is performed, that is, when the power switch 4 is on, the display section 6, for example, the pilot lamp is lit. This allows the user to notice that the device is powered and that the device is in the silencing operation. Therefore, when it is no longer necessary to cause this device to perform the muffling operation (for example, when leaving the seat), the user should remember to turn off the power switch 4 according to the display on the display unit 6. Therefore, energy saving can be achieved. In particular, when a pilot lamp is used for the display unit 6, energy saving can be achieved with a very simple device configuration.

FIG. 2 is a block diagram of the second embodiment of the noise control device according to the present invention. The noise control device of the second embodiment has a noise observation unit 1, a noise control unit 2, and a secondary sound source unit 3 similar to those of the noise control device of the first embodiment, and further, A user observation unit 7 that detects the presence or absence and a power supply control unit 8 that controls the supply of electric power to each unit based on the detection result of the user observation unit 7 are provided. Here, as the user observation unit 7, it is possible to determine the presence or absence of a user by using a light switch or a telephone switch in a room in which a noise control device is installed, or a television camera is used.
The presence or absence of the user can be determined based on the cumulative result of the squared error for each bit between the current image captured by the television camera and the previous image.

In the noise control system of the second embodiment having such a configuration, when the user observation section 7 detects the presence of the user, the power supply control section 8 supplies electric power to each section. , The mute operation is performed in the same manner as described above. On the other hand, when there is no user, the user observing unit 7 no longer senses the presence of the user, and as a result, the power control unit 8
Stops the supply of electric power to each unit. In this way, the silencing operation can be stopped while there is no user, and energy can be saved. The user observation section 7
As an example, by using an electric light switch and a telephone switch in a room where a noise control device is installed, energy can be saved with a simple device configuration. Further, when a television camera, for example, is used as the user observation unit 7, the device configuration becomes more complicated than when an electric light switch or the like is used, but since the switch operation is not required and the muffling operation can be automatically controlled, For example, it is possible to eliminate useless muffling operation due to forgetting to turn off the electric light switch, etc., and more reliable energy saving can be achieved.

FIG. 3 is a block diagram of the third embodiment of the noise control device according to the present invention. The noise control device of the third embodiment has a noise observation unit 1, a noise control unit 2, and a secondary sound source unit 3 similar to the noise control devices of the first and second embodiments,
Furthermore, the noise level detection unit 9 that detects the level (magnitude) of the noise signal x from the noise observation unit 1, and the supply of electric power to each unit according to the level of the noise signal x detected by the noise level detection unit 9 And a power supply control unit 10 for controlling the. The power supply control unit 10 is configured to be able to set a predetermined threshold value TH with respect to the level of the noise signal x, for example, and when the level of the noise signal x is higher than the threshold value TH, supplies power to each unit. Then, when the level of the noise signal x is smaller than the threshold value TH, control is performed so as to stop the electric power to each unit.

In the noise control device of the third embodiment having such a configuration, the noise canceling operation is performed only while the noise is larger than the threshold value TH, and when the noise becomes smaller than the threshold value TH, the noise canceling operation is automatically stopped. Energy saving can be achieved without the need for a light switch, a telephone switch, a television camera, or the like. Further, at this time, if the threshold value TH can be variably set by the user, it can be flexibly dealt with. For example, when a user uses this device, the threshold TH is set to a level at which the user feels noisy.
By setting, it is possible to perform a silencing operation suitable for the user. Furthermore, when the threshold value TH is set to the lower limit value that can effectively muffle, the use of the muffling space (in a factory, office, conference room, etc.)
Since the noise level can be uniformly determined by the user and the user does not mute the noise more than necessary, reliable energy saving can be achieved.

FIG. 4 is a block diagram of the fourth embodiment of the noise control device according to the present invention. The noise control device of the fourth embodiment has a noise observation unit 1, a noise control unit 2, and a secondary sound source unit 3 similar to those of the noise control devices of the first to third embodiments, and further, A power supply control unit 12 is provided which is interlocked with the noise source switch and supplies power to each unit to perform a noise reduction operation only while the noise source switch is on. In the example of FIG. 4, the air-conditioning fan switch 13 that turns the air-conditioning fan 55 on and off is used as a noise source switch.

In the noise control system of the fourth embodiment having such a configuration, the power supply control section 12 includes the air conditioning fan switch 13
Is turned on, the air conditioning fan 55 is driven, and the air conditioning fan 5
It is possible to supply electric power to each part and perform the silencing operation only during the period when the noise due to No. 5 is generated. When the air conditioning fan switch 13 is turned off, the power supply control unit 12 stops the supply of electric power to each unit, whereby the silencing operation can be automatically stopped, and energy saving can be achieved.

FIG. 5 is a block diagram of the fifth embodiment of the noise control device according to the present invention. The noise control device of the fifth embodiment has a noise observation unit 1, a noise control unit 2, and a secondary sound source unit 3 similar to those of the noise control devices of the first to fourth embodiments,
Further, a power supply control unit 15 is provided that stops the supply of power to each unit after a predetermined time that has been set in advance has elapsed after supplying power to each unit and starting the muffling operation. In the example of FIG. 5, in order to measure a predetermined time after the start of the muffling operation,
A timer 16 and a push button switch 17 are provided. The push button switch 17 is turned on only while the push button switch 17 is pushed, and when the push button switch 17 is turned on, the power supply control unit 15 starts supplying electric power.

In the noise control system of the fifth embodiment having such a configuration, the timer 16 is preset with a predetermined time. The user depresses the push button switch 17 when he / she wants the device to perform the muffling operation. As a result, the push button switch 17 is turned on, and the power control unit 15
Starts the supply of electric power to each unit and starts the silencing operation. The timer 16 measures a predetermined time from this point,
When a predetermined time has elapsed, the power supply to each unit is stopped and the silencing operation is automatically stopped.

As described above, in the fifth embodiment, when a preset predetermined time elapses after the silencing operation is started,
Since the muffling operation can be automatically stopped, it is possible to reliably prevent forgetting to turn it off and to ensure energy saving. In particular, it is suitable for use by an unspecified number of users, since a simple operation of pressing the push button switch 17 only once is sufficient. That is, for example, when there are a plurality of users in one room and a user wants to perform the muffling operation, the user need only press the push button switch 17 once.

FIG. 6 is a block diagram of a sixth embodiment of the noise control device according to the present invention. The noise control device of the sixth embodiment has a noise observation unit 1, a noise control unit 2, and a secondary sound source unit 3 which are similar to those of the noise control devices of the first to fifth embodiments. A push button switch 20 and a power supply control unit 21 that supplies power to each unit to perform a muffling operation only while the push button switch 20 is pressed are provided.

In the noise control system of the sixth embodiment having such a configuration, the power supply control section 21 supplies electric power to each section while the push button switch 20 is pressed by the user to be turned on. When the mute operation is performed and the user releases the push button switch 20 to turn it off, the power supply is stopped and the mute operation is stopped. As a result, it is possible to prevent forgetting to turn it off, and ensure energy saving with a simpler configuration.

[0029]

As described above, according to the first aspect of the present invention, the operating state of the device can be made noticeable to the user by displaying the operating state of the device by the display means. When a pilot lamp is used as the display means, energy can be saved with a very simple device configuration.

According to the second aspect of the present invention, the presence / absence of a user is sensed by the user observing means, and the silencing operation is performed only while the presence of the user is sensed by the user observing means. Therefore, the silencing operation can be stopped while there is no user of the apparatus, and energy saving can be effectively achieved.

Further, according to the third aspect of the invention, since the silencing operation is performed only during the period when noise above a predetermined threshold is sensed, as long as the sound is so small that silencing is unnecessary. The silencing operation can be stopped, and energy saving can be effectively achieved.

Further, according to the invention of claim 4, since the predetermined threshold value can be variably set, the user can set the threshold value to a value suitable for himself or herself, and a plurality of noise levels which are perceived as noisy. It is possible to flexibly respond to the difference between users.

Further, according to the invention of claim 5, the predetermined threshold value is set to the lower limit value for effective silencing, so that the use of the silencing space (factory The noise level can be uniformly determined by the internal office, the office, the conference room, etc., and the user does not mute the noise more than necessary, so that reliable energy saving can be achieved.

Further, according to the invention of claim 6, in conjunction with the noise source switch, the noise canceling operation is performed only during the period when the noise source switch is turned on, so that noise is generated. The muffling operation can be performed only during the operation, and energy can be effectively saved.

According to the seventh aspect of the invention, after the silencing operation is started, the silencing operation is stopped after a predetermined time has elapsed, so that it is possible to reliably prevent forgetting to turn off the power supply. Therefore, it is possible to achieve reliable energy saving, and in particular, it is suitable for use by an unspecified number of users, since a simple operation of pressing the switch once at first is sufficient.

Further, according to the invention as set forth in claim 8, since the muffling operation is performed only while the switch is pressed, it is possible to prevent forgetting to turn off the power source, and surely save energy by a simple structure. Can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of a noise control device according to the present invention.

FIG. 2 is a configuration diagram of a second embodiment of the noise control device according to the present invention.

FIG. 3 is a configuration diagram of a third embodiment of the noise control device according to the present invention.

FIG. 4 is a configuration diagram of a fourth embodiment of a noise control device according to the present invention.

FIG. 5 is a configuration diagram of a fifth embodiment of a noise control device according to the present invention.

FIG. 6 is a configuration diagram of a sixth embodiment of the noise control device according to the present invention.

[Explanation of symbols]

 1 Noise Observation Section 2 Noise Control Section 3 Secondary Sound Source Section 4 Power Switch 6 Display Section 7 User Observation Section 8 Power Supply Control Section 9 Noise Level Detection Section 10, 12, 15, 21 Power Supply Judgment Section 13 Air Conditioning Fan Switch 16 Timer 17,20 push button switch

Claims (8)

[Claims] 1. A noise observing means for observing noise in a noise generating source, a signal processing means for processing a signal obtained by the noise observing means, and a result of signal processing by the signal processing means in order to perform a muffling operation. A secondary sound source means for generating a secondary sound for noise control in accordance with the signal of 1. and a display means for displaying the operating state of the device. 2. A noise observing means for observing noise at a noise generating source, a signal processing means for processing a signal obtained by the noise observing means, and a result of signal processing by the signal processing means for performing a noise reduction operation. A secondary sound source means for generating a secondary sound for noise control in accordance with the signal of 1., and further, a user observing means for detecting the presence or absence of a user, and the user observing means for detecting the presence of the user. 2. A noise control device, comprising: an operation control means for controlling the operation of the device so that the silencing operation is performed only during a sensing period. 3. A noise observing means for observing noise in a noise generating source, a signal processing means for processing a signal obtained by the noise observing means, and a result of signal processing by the signal processing means for performing a noise reduction operation. A secondary sound source means for generating a secondary sound for noise control in accordance with the signal of No. 1 and further, so that the noise canceling operation is performed only during the period when the noise observing means senses noise above a predetermined threshold value. A noise control device, characterized in that the device is provided with operation control means for controlling the operation of the device. 4. The noise control device according to claim 3,
The noise control device, wherein the predetermined threshold value can be variably set. 5. The noise control device according to claim 3,
The noise control device according to claim 1, wherein the predetermined threshold value is set to a lower limit value capable of effectively muting. 6. A noise observing means for observing noise in a noise generating source, a signal processing means for processing a signal obtained by the noise observing means, and a result of signal processing by the signal processing means for performing a noise reduction operation. A secondary sound source means for generating a secondary sound for noise control in accordance with the signal of 1., and further, in conjunction with the switch of the noise generating source, the noise canceling operation is performed only while the noise generating source is switched on. A noise control device comprising: an operation control means for controlling the operation of the device so that 7. A noise observing means for observing noise in a noise generating source, a signal processing means for processing a signal obtained by the noise observing means, and a result of signal processing by the signal processing means for performing a noise reduction operation. And a secondary sound source means for generating a secondary sound for noise control in accordance with the signal of No. 1, and further, the operation of the apparatus is such that the silencing operation is stopped when a preset time has elapsed after the silencing operation is started. A noise control device comprising: an operation control means for controlling the noise. 8. A noise observing means for observing noise in a noise generating source, a signal processing means for processing a signal obtained by the noise observing means, and a result of signal processing by the signal processing means for performing a noise reduction operation. A secondary sound source means for generating a secondary sound for noise control in accordance with the signal, and further, a switch operated by the user and a silencing operation are performed only while the switch is pressed. And a motion control means for controlling the motion of the device, the noise control device.