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599results about How to "Suitable for application" patented technology

Active noise control method for eliminating and reducing noise

The invention discloses an active noise control method for eliminating and reducing noise. An active noise control device is subjected to the operation in the following steps of: (1) identifying a transfer function between a secondary source and an error sensor by using a common LMS (Least Mean Square) algorithm to obtain a transfer function estimating value of a signal transmitting channel; (2) obtaining an output signal y1(n) of an FXLMS (Filtered-x Least Mean Square) algorithm self-adapting filter W(n) according to a primary noise source signal x(n); (3) obtaining an output signal y2(n) of a DFT-FSF (Discrete Forurier Transform-Fast Forurier Transform) algorithm self-adapting filter according to a filtering reference signal of the signal transmitting channel; (4) adding y1(n) and y2(n) to obtain y(n) and respectively obtaining an expected signal d(n) and an error signal e(n) at the error sensor position and an estimating value of d(n); and (5) updating the DFT-FSF algorithm self-adapting filter V(n) and adjusting the FXLMS self-adapting filter W(n); and repeating the steps (2) to (5) and gradually reducing e(n) to achieve the aim of noise reduction at the error sensor position. The invention has the advantage of combining and utilizing the favorable benefits that an FXLMS algorithm is suitable for narrowband noise reduction and a DFT-FSF algorithm is suitable for broadband noise reduction and greatly reduces computation burden.
Owner:ZHEJIANG WANLI UNIV

Optimized virtual sound synthesis method based on headphone replay

InactiveCN104240695AReduce positioningReduce front-to-back confusion, etc.) issuesStereophonic systemsSpeech synthesisSpatial OrientationsHead related impulse response
The invention discloses an optimized virtual sound synthesis method based on headphone replay. The method includes the steps that according to the physical and geometric characteristics of a sound environment needing to be virtually created, the room impulse response (RIR) arriving at the position of a listener is determined; according to the arrival spatial orientation of direct sounds and reflected sounds in the RIR relative to the center of the head of the listener, the corresponding head-related impulse response (HRIR) and the direct sounds and the reflected sounds in the RIR are selected to be respectively subjected to convolution so that binaural room impulse response (BRIR) can be obtained; single-path signals of a virtual sound source and the BRIR are subjected to convolution so that binaural sound signals can be obtained; the binaural sound signals and the inverse function of a headphone transfer function HpTF are subjected to convolution so that headphone compensated binaural sound signals can be obtained and fed back to headphones for replay. With the method, a signal processing algorithm can be optimized, the calculation amount is reduced, the synthesized binaural sound signals are subjected to headphone compensation, the in-head positioning and sound image distorsion problems can be well solved, and the method is wide in application range.
Owner:SOUTH CHINA UNIV OF TECH

Complex microbial inoculant and method for preparing organic fertilizer by using same

The invention discloses complex microbial inoculant which comprises the following active ingredients: bacillus subtilis, bacillus megatherium, trichoderma koningii, aspergillus oryzae, trichoderma viride, geotrichum candidum, aspergillus niger, rhizopus oligosporus, lactobacillus plantarum CICC20768 and azotobacter chroococcum. Correspondingly, the invention further discloses a method for preparing an organic fertilizer from the complex microbial inoculant. The method comprises the following steps: a. uniformly mixing the complex microbial inoculant with a plant fiber raw material to obtain a fermented raw material; b, composting and fermenting the fermentation raw material; c, drying the composted fermentation raw material to obtain the organic fertilizer. microbes of the complex microbial inoculant have no antagonism, and can effectively cooperate in the production process of the organic fertilizer, and the chemical components of the production raw materials can be sufficiently utilized to finally produce the high-quality organic fertilizer. The produced organic fertilizer reaches the parameter indexes of the standard (NY884-2012) of China, can improve the planting property of soil, is beneficial to optimization of soil microbial flora, and can provide comprehensive nutrients to a plant root system.
Owner:江苏联海生物科技有限公司
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