49results about How to "Prevent echo" patented technology

An acoustic apparatus has permanent magnets 2 and 3, which have north poles and south poles magnetized alternately in a stripe-like fashion, at the front and back of a diaphragm 1, respectively; and has a conductor circuit 4 wired on the diaphragm 1 along the stripe-like poles of the permanent magnets 2 and 3. This offers an advantage of being able to prevent an echo. The diaphragm 1, permanent magnets 2 and 3, conductor circuit 4, spacer 5, and iron plates 6 and 7 are installed in a baffle 8.

The invention relates to the security control technology of intelligent equipment and discloses an application hiding control method. The method comprises the first step of determining a target application to be hidden, the second step of transmitting a broadcast message representing that the target application is deleted, and the third step of intercepting an access instruction of a starter process to the target application and correspondingly returning a null value to the process of the starter for the target application so as to hide a shortcut icon of the target application in the starter. Furthermore, the method can include the following supplementary steps of determining a hidden target application to be displayed and transmitting a broadcast message representing that the hidden target application is added so as to display a shortcut icon of the target application in the starter. By means of the method, the application program can be hidden in the starter, and follow-up normal running of the application program is not influenced. The application hiding control method can be applied to an Android operating system and can also be applied to an operating system environment provided with a similar framework or mechanism.

The invention discloses a single carrier radar communication integrated signal implementation device based on phase jitter, and belongs to the technical field of radar communication. The single carrier radar communication integrated signal implementation device based on phase jitter is suitable for solving the problem that the distance sidelobe level of a radar signal in an integrated signal is too high, and can complete radar detection and communication. The single carrier radar communication integrated signal implementation device based on phase jitter includes a radar transmitting terminal,a communication receiving terminal and a radar receiving terminal, wherein the radar transmitting terminal is used for acquiring an optimal integrated signal matrix hat{S}opt<,> of Ns communication sequences, and the thinking of the single carrier radar communication integrated signal implementation device based on phase jitter includes the steps: acquiring a communication data stream, dividing the communication data stream into Ns communication sequences, and calculating an integrated signal of the Ns communication sequences, wherein Ns is a positive integer greater than 1; according to theintegrated signal of the Ns communication sequences, calculating the autocorrelation sidelobe level vector of the integrated signal of the Ns communication sequences; according to the autocorrelationsidelobe level vector of the integrated signal of the Ns communication sequences, constructing a target optimization function of the Ns communication sequences; and optimizing the target optimizationfunction of the Ns communication sequences to obtain an optimal integrated signal matrix hat{S}opt<.> of the Ns communication sequences.

The object of the present invention is to provide a method and device for group acoustic echo cancellation. The echo canceling device obtains one or more source voice packet streams in the same multi-party call to be subjected to packet acoustic echo cancellation, and selects packets from the one or more source voice packet streams, so as to obtain a broadcast corresponding to the multi-party call stream, according to the reference packet stream corresponding to the broadcast stream, perform echo cancellation on the target packet stream corresponding to the broadcast stream, so as to obtain the echo-cancelled packet stream corresponding to the target packet stream, and finally the A stream of echo-canceled packets is broadcast to peers in the multi-party call. Compared with the prior art, the present invention realizes packet echo cancellation for multi-party calls, reduces buffer consumption, channel allocation and corresponding maintenance and signaling overhead for packet acoustic echo cancellation, and improves the performance of packet acoustic echo cancellation And make the performance of group acoustic echo cancellation independent of the number of participants.

The device comprises a vertical intake flue (30) for the fumes (F), which passes through the bottom wall (2) of the scrubber (1) and which in the bottom part comprises a sheath (31) consisting of Made of material resistant to a temperature of at least 350° C. and arranged on the outside of the scrubber. In order to limit salt encrustation in the device, the flue comprises a duct (32) with multiple walls in the top part. The duct (32) comprises both an inner wall (32.1) made of a material resistant to temperatures of at least 350°C and an outer wall (32.2) separated from the inner wall by an insulator (32.3). In addition, the conduit is at least partially arranged inside the scrubber while extending longitudinally upwardly from the bottom wall of the scrubber for at least 300mm.

The invention discloses an obstacle avoidance detecting device for an electric power inspection unmanned aerial vehicle, comprising a radar detection module and a connecting structure provided on thetop cover of the unmanned aerial vehicle. The radar detection module is fixed to the unmanned aerial vehicle by the connecting structure on the top cover of the unmanned aerial vehicle. The radar detection module comprises a radar bottom cover (6), a first probe connector (5) and a radar mounting bracket (4). A probe mounting groove is formed in the center of the upper surface of the radar bottomcover (6). The first probe connector (5) is provided in the probe mounting groove and penetrates through the lower surface of the radar bottom cover (6). A plurality of protruding claws (7) located around the first probe connector (5) are provided on the lower surface of the radar bottom cover (6). The first probe connector (5) is electrically connected to the millimeter wave conversion board (2).According to the obstacle avoidance detecting device for an electric power inspection unmanned aerial vehicle, the propellers of the obstacle avoidance detecting device interfering the radar echoes due to vertical mounting, and the detection precision of the obstacle avoidance detecting device is greatly improved.