The devices have attracted controversy on the basis of human rights and discrimination concerns. However, for example, the sound absorptivity variable member 14 may be placed in a head rest 31 arranged at an upper portion of the passenger seat 30 (shown in FIG. OSH professionals use the hierarchy of control to determine how to implement practical and effective risk management programmes to tackle noise-related issues in the workplace. 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. Referring to Table 1, when using the sound absorptivity variable member 14 in the first to ninth examples, significant sound absorbing effects can be obtained according to the sound pressure level difference between before providing the stimulus source (stimulus source control off) and after providing the stimulus source (stimulus source control on). Using white noise machines safely 3. 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. Ecotone Systems Private Limited - Offering Transformer Noise Control, Noise Control Device, नॉइज़ कंट्रोल इक्विपमेंट, शोर नियंत्रण के उपकरण, New Items in Greater Noida West, Gautam Budh Nagar, Uttar Pradesh. Some indoor devices will also fall into the ‘handheld’ device category due to their small size. The detected noise is converted into an electrical signal and transmitted to the stimulus source control part 12. 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). According to the noise control device of the first embodiment, the stimulus source is generated based on the frequency of the noise and is output to the sound absorptivity variable member. According to another aspect of the invention for which protection is sought there is provided a noise control device comprising 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 its sound absorptivity against the noise in response to receiving the stimulus source. When it comes to noise-canceling technology, there are two main methods most devices use. The elastic modulus variable film obtained by such method is formed to have a thickness of 200 µm. Similar to the general polymer synthesis, the elastomer is synthesized, for example, by simple random copolymerization or by a random polymer similar addition reaction with multi-functional cross-linking agent molecule. 1. Therefore, there is no discomfort although the sound absorptivity variable member is installed in a region contacting human beings. In an embodiment, the sound absorptivity variable member is a combination of at least two or more of an air flow rate variable fabric, an elastic modulus variable fabric and an elastic modulus variable film. 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. Some interesting crowd control devices are perhaps not as well-know. 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. Based on such a principle, the polymer is made into the fiber to form the fabric (an air flow rate variable fabric or an elastic modulus variable fabric) or is formed in a film type (an elastic modulus variable film), and is used as the sound absorptivity variable member 14. It is an aim of the invention to address this issue and to improve upon such known technology. A noise detecting part can detect the noise from a noise source. As for the technique of reducing the noise using active noise control, Japanese Patent Application Laid-Open No. developed can be used to control the toxic gases, coming out of the diesel engines.These toxic gases are harmful not only to the atmosphere, but also to the human & animal race. B64D 11/06 20060101ALN20190410BHEP, Free format text: 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. Reviews 1. Also, the stimulus source control part 12 transmits the generated stimulus source control signal to the stimulus source providing part 13 at step S33. The invention relates to a noise control device which effectively reduces noise of a broad frequency band, including a noise detecting part (11) for detecting the noise from a noise source, a stimulus source control signal device (12) for outputting the stimulus source control signal corresponding to the noise frequency detected by the noise detecting part (11), a stimulus source … Alternatively, such a method may comprise incorporating the ionic liquid into the framework by an impregnating operation after a foaming operation. AT, Kind code of ref document: Further, the elastic modulus of the polymers is changed before and after receiving the stimulus source. 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. 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. KANO, HIROYUKI, Free format text: This is also called the “ antiphase.” In other words, the sound absorptivity variable member may be arranged to change its sound absorption characteristics or performance. Avantek 3. ORIGINAL CODE: EPIDOSNIGR1, Inventor name: Privacy Policy According to yet another aspect of the invention for which protection is sought there is provided a vehicle having a device as set out in one or more of the preceding paragraphs. Although the first to third embodiments explain the electric stimulus as the stimulus source, the invention is not limited thereto. The noise detecting part 11 converts the noise generated from the noise source (that is, noise) into an electric signal, which is proportional to a magnitude thereof, and transmits the signal to the stimulus source control part 12. 5, the explanation thereof is omitted herein. Further, in some embodiments, a table for generating the stimulus source control signal is stored in the memory unit, and the stimulus source control signal is generated using the table. The sound absorptivity variable member 14 can change the sound absorptivity (that is, the sound absorbing property) against a sound wave when receiving stimulus sources such as temperature, humidity, electricity, light, magnetic source, etc. Silentium has developed unique Active Noise Control (ANC) technology and an entire disruptive sound management solution, incorporating proprietary, innovative algorithms that adaptively follow the changes in the noise spectrum, achieving extraordinary results of almost 10dB (A) noise reduction. That is, the noise may be detected by arranging a plurality of noise detecting parts 11 at various positions. Although this ratio is preferred, in actual operation, a ratio from 10:1 to 1:10 is possible. 9 shows a measuring device used in a comparison example. 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. 1. 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. 7 includes certain elements other than those shown in FIG. Make Your Property Even Safer If you’ve been looking for the best electronic pest control devices, look no further! frequency range, modes, transfer functions characterised by the analysis of the input signals only, Reference signals, e.g. That is, the sound absorptivity variable member 14 can change the sound absorptivity against the noise by receiving the stimulus source. In addition to the above, the liquid crystal elastomer may comprise polymethacrylate, polychloroacrylate or polystyrene derivative, which exists in a glass state at room temperature. 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. 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. Thus, such a large structure cannot be used in a confined space such as the interior of a vehicle. 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. Since the operable amount becomes less, however, such ratios tend to make it more difficult to maintain the shape. The air flow rate variable fabric obtained by such manufacturing method is formed to have a thickness of 10 mm and an area density of 1000 g/cm2 and is installed on the head linings of a driver seat and a passenger seat to have a side of 30 cm, respectively (0.09 m2) (see FIG. 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. A1, Designated state(s): A more preferred elastomer, which exists in a liquid crystal state at room temperature, may comprise polyacrylate, polysiloxane, polyphosphazene or a copolymer thereof. The noise detecting part 11 is not specifically limited as long as it has the function of measuring various noises such as normal noise, fluctuating noise, intermittent noise, shock noise, separate shock noise or quasi-steady shock noise, and may be appropriately varied depending on the type of the noise to be measured. Since our inception, we are instrumental in providing best in class Noise Control Acoustic Canopy. A noise control device and method effectively reduce noise throughout a broad frequency band. SNOOZ White Noise Sound Machine - Real Fan Inside for Non-Looping White Noise Sounds - App-Based Remote Control, Sleep Timer, and Night Light - Cloud 4.7 out of 5 … Further, when installing the resonator structure in the head rest, there is discomfort when the head portion contacts the head rest. Thus, a total of four sheets is installed (see FIG. The third embodiment also illustrates an example wherein the sound absorptivity variable member 14, the sound absorptivity of which is changed by receiving an electric stimulus (e.g., voltage), is applied to a vehicle. 1, the noise control device 10 of the present embodiment is next explained in more detail. Also, since FIG. In the present examples, the noise reduction is focused in a frequency band of 630 Hz when the driving speed is 30 km/h. Further, by a relatively simple control method, the time until absorbing the sound after detecting the noise can be significantly reduced. At next step S36, the indoor noise of a vehicle is detected by the indoor noise detecting part 11 b. 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. 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. 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. The stimulus source control signal includes information for instructing a magnitude of the stimulus source assigned to the sound absorptivity variable member 14 or the generation of the stimulus source. 6 is an operational flow chart for the noise control device 20 in accordance with the second embodiment. 4). The air flow rate variable fabric is obtained by the manufacturing method disclosed in Japanese Laid-Open Patent Application No. 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. A finite element analysis model of noise propagation and noise control of the device is established. The round edges make it comfortable to hold and the strap ensures the device is easy to carry around. Although the third embodiment illustrates an example using two noise detecting parts 11a and 11 b, the invention is not limited thereto.
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