Further, a place for arranging the sound absorptivity variable member 14 is not specifically limited as long as the noise from the outdoor can be effectively reduced. In an embodiment, the sound absorptivity variable member is an air flow rate variable fabric configured to change an air flow rate and the sound absorptivity against the noise in response to the stimulus source. Also, the sound absorptivity variable member 14 receives the electric stimulus output from the stimulus source providing part 13, thereby changing the sound absorptivity against the noise at step S16. The threshold determining part 12b then determines whether the sound pressure level calculated in S22 reaches a threshold sound pressure level at step S23. An ultrasonic pest control device is ideal for repelling pests and can work as part of a multi-pronged approach to pest control. FIG. But you may have to act fast as this top noise control device is set to become one of the most sought-after best-sellers in no time. A control circuit is a portion of the stimulus source control part 12 and is configured to have a transmission function for a relationship between the installation location of the microphone and the head rest neighbourhood of the vehicle. The noise detected by the indoor noise detecting part 11 b is converted into an electrical signal proportional to the magnitude thereof and transmitted to the stimulus source control part 12. LectroFan Evo 2. The stimulus source providing part 13 receives the stimulus source control signal from the stimulus source control part 12, generates the stimulus source based on the received stimulus source control signal, and outputs the generated stimulus source to the sound absorptivity variable member 14. The impurities used herein may comprise at least one ion selected from: halide ion such as chloride ion, bromide ion, etc. 2 is omitted in this description of FIG. In an embodiment, the sound absorptivity variable member comprises a stimulus responsive polymer. The detected noise is converted into an electrical signal and is transmitted to the stimulus source control part 12. Muzzle blast control devices are one great option which help mitigate the noise by sending it forward and downrange. 1 is a block diagram schematically illustrating a noise control device constructed in accordance with a first embodiment of the invention; FIG. Two sheets of the elastic modulus film having a size of Ï 10cm are installed at the rear surface side of a skin material of a head rest in the driver seat and the passenger seat, respectively. Products like earplugs, earmuffs, and most kinds of headphones employ passive noise insulation. The air flow rate variable fabric obtained by such manufacturing method is formed to have a thickness of 20 mm and an area density of 800 g/cm2 and is installed in an entire surface of an inner wall of the reverberation box 80b except for the compartment 82. The sound pressure level difference between the noise source (at the position of the noise detecting part) and an ear sound pressure (at a position 15 cm front of the head rest of the driver seat) is recorded for 30 seconds. It then generates a stimulus source control signal by means of the stimulus source control part 12 when the calculated sound pressure level reaches a desired sound pressure level. The elastic modulus variable fabric is obtained by the manufacturing method disclosed in Japanese Laid-Open Patent Application No. algorithms; Devices of the filter, Methods, e.g. Although this ratio is preferred, in actual operation, a ratio from 10:1 to 1:10 is possible. Further, when installing the resonator structure in the head rest, there is discomfort when the head portion contacts the head rest. Testing and analysis devices are the first step in determining accurate noise levels. Within the scope of this application it is envisaged that the various aspects, embodiments, examples, features and alternatives set out in the preceding paragraphs, in the claims and/or in the following description and drawings may be taken individually or in any combination thereof. In the second example, the stimulus source control part 12, the stimulus source providing part 13, the sound absorptivity variable member 14 (including its installation location) and the vehicle are the same as in the first example. Further, by a relatively simple control method, the time until absorbing the sound after detecting the noise can be significantly reduced. Since the ionic liquid is generally non-volatile at room temperature, the ionic liquid is retained within the framework. The measuring device is configured to have a structure obtained from scaling down a transmission loss detecting device according to JISA1416. Next, at step S34, the stimulus source providing part 13 receives the stimulus source control signal from the stimulus source control part 12 and generates the electric stimulus (e.g., voltage) assigned to the sound absorptivity variable member 14 based on the received stimulus source control signal. [ 21 ], but no real implementation, as well as plant and control system analysis, have been provided. In the first to ninth examples, as well as the first and second comparison examples, the vehicles are driven in a normal operation at a speed of 30 km/h and 60 km/h along a straight road. 1. The difference between the above elastic moduli changes the peak of absorbing the noise of a specific frequency band so as to cause a difference in the sound absorptivity. The device uses 'active noise control' technologyâfound in many high-end headphones that cancels external noiseâthat is adapted to work in a large open area. LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES, SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR, Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general, Methods or devices for protecting against, or for damping, noise or other acoustic waves in general, Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound, Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase, Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. B64D 11/06 20060101ALN20190410BHEP, Free format text: The above-described embodiments have been described in order to allow easy understanding of the invention and do not limit the invention. Big Red RoosterAdditional information 1. The invention generally relates to a noise control device and method, and particularly, but not exclusively, to device and method for providing internal silence by reducing the noise generated from a noise source. To promote health and comfortable lifestyle, achieving internal silence by reducing the noise generated from a noise source (e.g., mechanical structures such as an internal combustion engine of a vehicle) is desirable. Next, the stimulus source control part 12 receives the signal from the noise detecting part 11 and generates the stimulus source control signal based on the received signal in step S12. The stimulus source control part 12 then calculates the sound pressure level for each frequency of the noise, generates the stimulus source control signal when the calculated sound pressure level reaches a desired sound pressure level, and outputs the generated stimulus source control signal. For example, a technique referred to as active noise control has been introduced in the art in order to reduce the noise. Next, in step S14, the stimulus source providing part 13 receives the stimulus source control signal from the stimulus source control part 12 and generates an electric stimulus (voltage) assigned to the sound absorptivity variable member 14 based on the received stimulus source control signal. KANO, HIROYUKI, Free format text: Here, the amount of the ionic liquid to be incorporated into the framework is up to 50 % of a weight of the framework material when considering maintaining the framework strength or implementing an actual operation, although the invention is not limited thereto. Extension state: In an embodiment, the stimulus source control part further comprises a first sound pressure level calculating part configured to analyze a frequency of the noise and to calculate a sound pressure level for each frequency of the noise and a threshold determining part configured to determine whether the sound pressure level reaches a threshold sound pressure level, wherein the stimulus source control part is configured to output the stimulus source control signal to the stimulus source providing part when the threshold determining part determines the sound pressure level reaches the threshold sound pressure level. Ecotone Systems Private Limited - Offering Transformer Noise Control, Noise Control Device, नà¥à¤à¤à¤¼ à¤à¤à¤à¥à¤°à¥à¤² à¤à¤à¥à¤µà¤¿à¤ªà¤®à¥à¤à¤, शà¥à¤° नियà¤à¤¤à¥à¤°à¤£ à¤à¥ à¤à¤ªà¤à¤°à¤£, New Items in Greater Noida West, Gautam Budh Nagar, Uttar Pradesh. The process then ends. 9 shows a measuring device used in a comparison example. Thus, since the noise control device of the present invention can effectively reduce the noise throughout a broader frequency band, it is possible to increase the silence compared to the known devices. That is, the invention may include a plurality of noise detecting parts for each noise detecting part 11a and 11b. These sounds are s⦠Prior art keywords noise control noise control Prior art date 2007-12-27 Legal status (The legal status is an assumption and is not a legal conclusion. Panasonic Intellectual Property Management Co., Ltd. ããã½ããã¯ï¼©ï½ããã¸ã¡ã³ãæ ªå¼ä¼ç¤¾, AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR, B64D 11/06 20060101AFI20140306BHEP, G10K 11/178 20060101ALI20140306BHEP, PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LT, G10K 11/178 20060101AFI20190410BHEP, B64D 11/06 20060101ALN20190410BHEP, LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT, User designed active noise cancellation (ANC) controller for headphones, Controllers for active noise control systems, Active noise reduction device and active noise reduction method, Noise reduction devices, vehicles, noise reduction systems, and noise reduction methods, Active noise-reduction control apparatus and method, Noise cancellation system with lower rate emulation, Active noise control device and active vibration control device, Active noise controller and active vibration controller, Acoustic device and acoustic control device, Request for extension of the european patent, Request for extension of the european patent (deleted), Supplementary search report drawn up and despatched, Information provided on ipc code assigned before grant, Information on inventor provided before grant (corrected), Lapsed in a contracting state [announced via postgrant information from national office to epo], Information on lapse in contracting state deleted, Annual fee paid to national office [announced from national office to epo]. The measuring device comprises two reverberation boxes 80a and 80b and a compartment 82 separating the reverberation boxes 80a and 80b. One embodiment of a noise control method taught herein comprises, by example, detecting a noise generated from a noise source, outputting a stimulus source control signal according to a frequency of the noise and providing a stimulus source based on the stimulus source control signal to a sound absorptivity variable member configured to change sound absorptivity against the noise in response to receiving the stimulus source. In an embodiment, the sound absorptivity variable member is at least one of an air flow rate variable fabric configured to change an air flow rate and the sound absorptivity against the noise in response to the stimulus source, an elastic modulus variable fabric configured to change an elastic modulus and the sound absorptivity against the noise in response to the stimulus source, an elastic modulus variable film configured to change an elastic modulus and the sound absorptivity against the noise in response to the stimulus source and a stimulus responsive polymer. Some interesting crowd control devices are perhaps not as well-know. Noise control devices 1. At this time, the stimulus source control part 12 is configured to generate the stimulus source control signal based on the frequency of the noise detected by the indoor noise detecting part 11 b. That is, the noise may be detected by arranging a plurality of noise detecting parts 11 at various positions. The air flow rate variable fabric is obtained by the manufacturing method disclosed in Japanese Laid-Open Patent Application No. In the fourth example, the stimulus source control part 12, the stimulus source providing part 13, the sound absorptivity variable member 14 (including its installation location) and the vehicle are the same as in the first example. Since methods of calculating such a sound pressure level are already known, the details thereof are omitted herein. The sound pressure level calculating part 12a analyzes the frequency of the noise detected by the noise detecting part 11 b and calculates the sound pressure level for each frequency of the noise. 5 is a block diagram schematically illustrating a noise control device constructed in accordance with a second embodiment of the invention; FIG. Further, the stimulus source control part 12 transmits the generated control signal to the stimulus source providing part 13 at step S13. Unlike the first embodiment, when the desired sound pressure level is reached, the stimulus source is generated and applied to the sound absorptivity variable member. Thereafter, the sound absorptivity variable member 14 receives the electric stimulus outputted from the stimulus source providing part 13, thereby changing the sound absorptivity against the noise at step S35. The present invention will now be described, by way of example only, with reference to the accompanying drawings in which: FIGS. The specific objectives of noise management are to develop criteria for the maximum safe noise exposure levels, and to promote noise assessment and control as part of environmental health programmes. In this first embodiment, the stimulus source providing part 13 generates the electric stimulus by using a battery mounted in the vehicle. As for the ion gel, an ionic liquid can be incorporated into the gel framework of the polymer. In such a case, the sound pressure level calculated by the noise detecting part 11 b is transmitted to the stimulus source control part 13. Further, although application to the vehicle is explained below, the invention is not limited thereto. Further, the noise detecting part 11 may be configured to include the function of the sound pressure level calculating part 12a. The stimulus source control part 12 also serves as a sound pressure level calculating part and a threshold determining part. The liquid crystal elastomer is essentially formed by binding a mesogenic group, which is a central framework of the liquid crystal molecules, into the polymer chain as a pendant chain to generate the liquid crystal phase state of the elastomer. The sound is recorded for cases using and not using the noise control device of the invention. frequency range, modes, transfer functions, Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. In the eighth example, the noise detecting part 11 b, the stimulus source control part 12, the stimulus source providing part 13, the sound absorptivity variable member 14 (including its installation location) and the vehicle are the same as in the second example. Further, as for the sound absorptivity variable member 14, an air flow rate variable fabric formed by a conductive polymer is used. For example, the stimulus source providing part 13 can be a direct current stabilization power source such as "AD-8735D" produced by A&D Co., Ltd. Next, the operational procedures of the noise control device 10 constructed in accordance with the first embodiment are explained in detail with reference to the operational flow chart of FIG. For example, the noise detecting part 11 may include a sound level meter or a microphone functioning as a sensor. 8 is an operational flow chart for the noise control device according to FIG. 2007-277791. Further, an air flow rate variable fabric formed by a conductive polymer is used in the sound absorptivity variable part 14. 5, the functions of the elements may be different. The jet pressure ratio is varied to obtain the supersonic jets which are operated in a wide range of over-expanded to moderately under-expanded conditions. The active noise control technique is designed to reduce or counter the noise by generating another sound wave, which has the same amplitude as the noise but an opposite phase, thereby interfering with the noise. The stimulus source providing part 13 is electrically connected to the sound absorptivity variable member 14 by using a direct current stabilization power source ("AD-8735D" produced by A&D Co., Ltd. in this example). pure feedforward, General system configurations using both a reference signal and an error signal, General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. The outdoor noise detecting part 11a is installed on the engine cover as in the third example. These smaller devices are meant to deter your pup from barking anytime, anywhere. Since other elements are the same as in FIG. Privacy Policy recorded with a microphone, Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups, Estimation of noise, e.g. Referring back to FIG. Also, the third embodiment includes a sound pressure level determining part 12c. Alternatively, the relationship could be generated mathematically. However, where the frequency components of the noise have a high frequency band (such as equal to or higher than 1 kHz), the noise is not effectively reduced since the time taken until the noise damping wave is output after detecting the noise is relatively longer than the time taken to achieve one cycle of the noise frequency. 1 and 2 illustrate a noise control device constructed in accordance with a first embodiment of the invention. At next step S36, the indoor noise of a vehicle is detected by the indoor noise detecting part 11 b. For example, an engine mounted in the vehicle or another noise source generated according to an operating state of the vehicle is appropriate. The stimulus source control part 12 includes the sound pressure level calculating part 12a and the threshold determining part 12b, and performs the frequency analysis of the noise detected by the noise detecting part 11. Although the functions of the stimulus source control part 12 are preferably implemented in software operating on a CPU as described, its functions can be implemented in whole or in part by hardware, including discrete components. A few have shown promising results. The control wire device is composed of long cylinders with a very small diameter and its location is varied to investigate the control effectiveness of supersonic jet noise. Click for automatic bibliography A noise control device and method effectively reduce noise throughout a broad frequency band. Get contact details and address| ID: 20792819012 The technical range of the invention is not limited to such examples. ; guanidinium cation such as guanidinium cation having an imidazolinium framework, guanidinium cation having an imidazolium framework, guanidinium cation having tetrahydropyrimidinium, guanidinium cation having dihydropyrimidinium framework, etc. In the first example, a microphone is used and installed within a front pillar as the vehicular indoor noise detecting part 11. In an embodiment, the sound absorptivity variable member is an elastic modulus variable fabric or an elastic modulus variable film configured to change an elastic modulus and the sound absorptivity against the noise in response to the stimulus source. As shown in FIG. If youâve been looking for the best electronic pest control devices, look no further! A stimulus source control signal is output according to a frequency of the noise detected. For example, such a technique uses a variable resonator structure in order to change the sound absorbing property of a sound absorbing member. detecting abnormal output levels, Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. A total of 50 resonators is prepared in order to install 25 resonators at positions corresponding to the left and right ear positions of the passenger in the head rest, respectively (see FIG. 4). Research into white noise and sleep 2. 1, a noise control device 10 of the first embodiment comprises a noise detecting part 11, a stimulus source control part 12, a stimulus providing part 13 and a sound absorptivity variable member 14. The sound absorptivity variable member 14 may comprise, for example, an air flow rate variable fabric, an elastic modulus variable fabric or an elastic modulus variable film. Two sheets of the elastic modulus fabric having a diameter of 10 cm are installed at the rear surface side of a skin material of a head rest in the driver seat and the passenger seat, respectively. The organic acid may comprise, for example, carboxylic acid, sulfuric acid ester, high alkyl ether sulfuric acid ester, sulfonic acid, phosphoric acid ester, etc. Further, the microphone as the indoor noise detecting part 11 b is used and installed at 5 cm from a center console wall surface and a dash panel of the driver seat side to a vehicular indoor side and a height of 20 cm from a vehicular indoor floor surface, which is the same as in the second example. The inorganic acid may comprise, for example, super strong acid (e.g., fluoroboric acid, tetrafluoroboric acid, perchloric acid, hexafluorophosphoric acid such as hexafluoroantimonic acid and hexafluoroarsenic acid), phosphoric acid, boric acid, etc. Source control in roadway noise has provided little reduction in vehicle noise, except for the development of the hybrid vehicle; nevertheless, hybrid use will need to attain a market share of roughly fifty percent to have a major impact on noise source reduction of city streets. Many noise monitoring devices are inconspicuous to guests so they usually leave it alone and will never know you are monitoring the sound level. Further, the anion of the ionic liquid may include an organic acid and/or an inorganic acid. In the seventh example, the stimulus source control part 12, the stimulus providing part 13, the noise detecting part 11 a and 11 b and the vehicle are the same as in the fourth example. 1. One noise control device includes, for example, a noise detecting part configured and arranged to detect a noise generated from a noise source, a stimulus source control part configured to output a stimulus source control signal according to a frequency of the noise, a stimulus source providing part configured to provide a stimulus source based on the stimulus source control signal and a sound absorptivity variable member configured to change sound absorptivity against the noise in response to receiving the stimulus source. The benefits are two-fold: Windows can be left open for fresh air without disturbance from external noise pollution, and the device reduces the need for air-conditioning to keep the interiors of buildings and homes cool. Thus, it becomes possible to ensure quietness. 9. The air flow rate variable fabric is obtained by the manufacturing method disclosed in Japanese Laid-Open Patent Application No. ; alkyl sulfonate ion such as methyl sulfonate ion, ethyl sulfonate ion, etc. The outdoor noise detecting part 11a detects the outdoor noise. Alternatively, a mesogen monomer is copolymerized with a multi-functional comonomer to form a liquid crystal copolymer, which is changed into a network structure by the cross-linking agent in the second reaction process. The elastic modulus variable film obtained by such method is formed to have a thickness of 200 µm. Thus, such a large structure cannot be used in a confined space such as the interior of a vehicle. detecting abnormal output levels using detection of abnormal input signals, Methods, e.g. 8, the noise generated from the noise source is first detected by the outdoor noise detecting part 11a in step S31. Further, as for the conductive polymer, impurities have dramatic effects on the conductivity. 3102773. 6, the noise generated from the noise source is first detected by the noise detecting part 11 at step S21. G10K 11/178 20060101ALI20140306BHEP, Owner name: The noise detecting part 11 shown in FIGS. A noise detecting part can detect the noise from a noise source. As for the amount of incorporating a liquid crystal framework (mesogen group) in a pendant chain and a straight chain of the elastomer, when considering maintaining the shape and increasing the operating amount, it is preferred that as a mole ratio, the ratio of the elastomer : the liquid crystal framework, which becomes the framework, is approximately 1 : 1. 7 is a block diagram schematically illustrating a noise control device constructed in accordance with a third embodiment of the invention; FIG. A noise control device 30 of the third embodiment is configured to detect the noise generated from an outdoor noise source and the indoor noise by using the outdoor noise detecting part 11a and the indoor noise detecting part 11 b. algorithms; Devices of the filter the filter being an adaptive filter, General system configurations using a reference signal without an error signal, e.g. Read about company. Make Your Property Even Safer The stimulus source control part 12 receives a signal from the outdoor noise detecting part 11a or the indoor noise detecting part 11 b, generates the stimulus source control signal based on the received signal, and outputs the generated stimulus source control signal. Developments of Emission and Noise Control Device( Aqua Silencer) As I have previously explained, these devices create a physical barrier which muffles or completely blocks out external noises. The control system should provide signals to drive the exciters in order to acoustically isolate the device inside (block the noise going out, according to the ASAC idea). Active noise-cancelling devices, such as earbuds have microphones that pick up ambient noises and then generate noise-canceling waves that are 180 degrees out of sync with the ambient noises, thus âerasingâ them. A noise control device comprising a hollow structural body having a plurality of elongate hollow passages... 2. The stimulus source control part 12 generates the stimulus source control signal corresponding to the frequency of the noise detected by the noise detecting part 11 based on the frequency of the noise detected by the noise detecting part 11 and the table for generating the stimulus source control signal. stimulus source control means for outputting a stimulus source control signal according to a frequency of the noise; In FIG. If the calculated sound pressure level does not reach the threshold sound pressure level, that is, the response to the query of step S23 is "NO," then the process returns to step S21.