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107results about How to "Avoid elimination" patented technology

Double-talk detection and echo cancellation method based on zero-crossing rate

The invention discloses a double-talk detection and echo cancellation method based on zero-crossing rate, comprising the following steps: S1, zero-crossing rate calculation and double-talk monitoring: different echo cancellation strategies are adopted for double-talk and single-talk scenarios; S2, echo filter estimation and echo cancellation; there is difference between an echo signal collected by a microphone and a far-end signal because of room impulse response, and the echo component is eliminated from the signal collected by the microphone; and S3, recovery of a target speech harmonic structure. A harmonic structure analysis method is used to compensate for the missing harmonic components of near-end speech to further inhibit speech distortion. Compared with the traditional echo cancellation technology, double-end monitoring is realized based on the zero-crossing rate, and elimination of target speech is avoided. Based on the criterion of frequency-domain minimum mean square error, an echo cancellation filter converges rapidly. By adopting a frequency-domain parallel processing framework, the complexity is low. A speech distortion inhibition module is added, and the distortion degree of target speech is reduced.
Owner:深圳市雅今智慧科技有限公司

Greenhouse roller blind control system and working method thereof

The invention discloses a greenhouse roller blind control system and a working method of the greenhouse roller blind control system. The greenhouse roller blind control system comprises a roller blind controller, a non-contact reversing module, a roller blind machine upper connection rod, a roller blind machine lower connection rod, a hinge a, a hinge b, a roller blind machine, an angle sensor a, an angle sensor b, an upper dead center limiting switch and a lower dead center limiting switch. The working method includes the steps of initializing the state, expanding the heat preservation quilt and roller blind machine power-off protection process and unfolding the heat preservation quilt. The greenhouse blind control system and the working method of the greenhouse roller blind control system have the advantages that the actual operation state of the roller blind machine can be detected by the system, fault alarming can be achieved, executing mechanisms such as a motor, a speed reducer and the heat preservation quilt are protected, equipment damage caused by maloperation is reduced and avoided, automatic and remote adjusting of the greenhouse environment can be achieved, the dependence degree on workers can be accurately and obviously reduced in time, management and operation cost is reduced, and the operation safety and the economic benefits of facility cultivation are effectively improved.
Owner:TIANJIN YONGDE AGRI TECH

Greenhouse roller shutter control mechanism and method

The invention provides a greenhouse roller shutter control mechanism and method. The mechanism comprises a heat preservation quilt, a roller shutter machine, a supporting structure, a controller and a motor reversing mechanism, wherein the heat preservation quilt covers a greenhouse film of a greenhouse, the roller shutter machine is fixed to a rolling shaft of the heat preservation quilt, the supporting structure is hinged to the ground and fixedly connected with the roller shutter machine, the controller controls the roller shutter machine to operate, and the motor reversing mechanism is connected with the controller and controls the operation direction of the roller shutter machine; the supporting structure comprises an upper connecting rod, a lower connecting rod and an angle encoder, wherein one end of the upper connecting rod is fixed to the roller shutter machine, the lower connecting rod is connected with the upper connecting rod in a hinged mode and hinged to the ground, and the angle encoder is fixed to any hinge connection position and is in signal connection with the controller. According to the technical scheme, the greenhouse roller shutter control mechanism is simple and firm in structure, low in cost, high in automation degree, high in system control precision and great in reliability.
Owner:张立岩

Vertical air conditioner indoor unit and air conditioner provided with same

The invention discloses a vertical air conditioner indoor unit and an air conditioner provided with the same. The vertical air conditioner indoor unit comprises a housing, an indoor heat exchanger, an indoor fan and an air processing device, wherein the housing is provided with a first indoor air inlet, a second indoor air inlet, a fresh air inlet, a first air outlet, a second air outlet, a heat exchange air channel and an air processing air channel, the heat exchange air channel and the air processing air channel are mutually isolated, the first indoor air inlet is communicated with the air inlet side of the heat exchange air channel, the first air outlet is communicated with the air outlet side of the heat exchange air channel, both the second indoor air inlet and the fresh air inlet are communicated with the air inlet side of the air processing air channel, the second air outlet is communicated with the air outlet side of the air processing air channel, and the air processing device is arranged in the air processing air channel and comprises a purifying module, a humidification module and a guiding fan. The vertical air conditioner indoor unit can introduce indoor air into the air processing air channel for purification and humidification processing, can also introduce outdoor fresh airflow into a room and facilitates improvement of indoor air quality.
Owner:GD MIDEA AIR-CONDITIONING EQUIP CO LTD

Construction method and device for cross-equipment electromagnetic fingerprint database on the basis of machine learning

The invention discloses a construction method for a cross-equipment electromagnetic fingerprint database on the basis of machine learning. The method comprises the following steps that: firstly, collecting the electromagnetic signal of equipment, and carrying out denoising, specific window bandwidth interception and digital processing on the electromagnetic signal; then, carrying out the machine learning on the processed electromagnetic signal, judging and obtaining the classification and the marking of the electromagnetic signal, and conveying the classification and marking information to a display; and finally, judging the correctness of a displayed equipment identification result by a user, if the displayed equipment identification result is correct, storing the classification and marking information into the electromagnetic fingerprint database, otherwise, collecting the electromagnetic signal of the equipment again, and carrying out machine learning again until the displayed equipment identification result is correct. By use of the method, the electromagnetic signal of the equipment can be accurately obtained so as to establish the electromagnetic fingerprint database, and the electromagnetic fingerprint database can be updated and enlarged while the database is used. The invention also discloses a device for realizing the above method, the support of external marking equipment is not required, cost is saved, and natural interaction with articles is enhanced.
Owner:ZHEJIANG UNIV

Preparation method of drug-loading hemostatic sponge as well as drug-loading hemostatic sponge prepared from same

The invention discloses a preparation method of drug-loading hemostatic sponge. The preparation method comprises the following steps: (1) preparing lignocelluloses sponge; and (2) loading the lignocelluloses sponge with chitosan and a hemostatic drug in a spraying or immersion manner, and freeze drying to obtain the drug-loading hemostatic sponge. A preparation method of the lignocelluloses spongecomprises the following steps: (1) freezing an alkali urea solution, forming icy slurry, adding lignocelluloses into the icy slurry, and obtaining a lignocelluloses solution; (2) adding a surfactantinto the lignocelluloses solution, stirring, and forming a foam body; (3) freezing the foam body into foam icy slurry, adding a pore forming agent into the foam icy slurry, injection molding, freezing, aging, and obtaining gel; and (4) soaking to remove the surfactant and the pore forming agent in the gel, freeze shaping, freeze drying, and obtaining the lignocelluloses sponge. By adopting the drug-loading hemostatic sponge prepared by the invention, by virtue of the synergistic effect of the chitosan and hemostatic drug, the blood on the surface of a wound can be rapidly absorbed, the blood coagulation of the wound can be effectively promoted, and the bleeding can be rapidly stopped.
Owner:ZHENGZHOU UNIV
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