49results about How to "Prevent echo" patented technology

The invention discloses an audio transmission delay measuring method and system. The method comprises performing synchronization operation on transmission of an original audio codebook to be measured between a transmitting end and a receiving end to obtain the transmission starting indicating information, the transmission ending indicating information, the receiving starting indicating information and the receiving ending indicating information of the original audio codebook; enabling the transmitting end to respond to the transmission starting indicating information and transmit the original audio codebook to be measured to the receiving end and to respond to the transmission ending indicating information and stop transmitting the original audio codebook to the receiving end, and enabling the receiving end to respond to the receiving starting indicating information and collect the original audio codebook transmitted by the transmitting end and to respond to the receiving ending indicating information and stop collecting the original audio codebook transmitted by the transmitting end; obtaining audio transmission delay according to the testing audio codebook collected by the receiving end and the original audio codebook prestored in the receiving end. The audio transmission delay measuring method and system solves the problem of inaccurate computation of audio transmission delay in the prior art.

The ear pad according to the present invention has a number of gathered sound-insulating walls (12) monolithically provided on an outer periphery of the basic body (11) made of an elastic material such as rubber, for instance, a silicon rubber or such as soft synthetic resins, for instance, polypropylene in a ring form with a prescribed space in the axial direction and made of the same material as that for the basic body. With this feature, the ear pad according to the present invention can provide softness and adaptability to be set in an auditory meatus without stimulating sensitive portions thereof.

The invention provides an ultrasonic phased array rapid full-focusing imaging detection method based on defect pre-positioning. The ultrasonic phased array rapid full-focusing imaging detection methodcomprises the steps of performing plane wave and full-matrix capture data collection on a target imaging area; carrying out coarse discretization processing on an imaging target imaging area, carrying out phase shift processing on the plane wave echo signal data set to obtain a plane wave imaging result, and carrying out pixel value analysis processing on the plane wave imaging result; carrying out defect positioning analysis on a plane wave imaging result through threshold processing, carrying out fine discretization processing on pixel points containing defects, and carrying out phase shiftprocessing on a full-matrix echo signal data set to obtain pixel values of the pixel points containing the defects; performing interpolation and amplification coefficient processing on unselected pixel points in the plane wave imaging result, and filling the corresponding grids with the pixel points; and obtaining a final imaging result. According to the method, an ultrasonic phased array plane wave algorithm and a full-focusing algorithm are combined, the time resolution is improved while the spatial resolution is kept, rapid ultrasonic phased array imaging detection is carried out on a component, and defects are effectively evaluated.

The invention relates to the field of communication and discloses a PSTN teleconference sound mixing method. The method includes the following steps that S1, voice active state monitoring is carried out on each member participating a conference, and the members in the voice active state are added into a sounding mixing list or a backup list; S2, updating is carried out on the sound mixing list at regular intervals; S3, gain adjustment is carried out on voice frequency of each member in the sound mixing list; S4, sound mixing is carried out, sound mixing results are output to each member participating the conference, for the member participating the conference which exists in the sound mixing list, output after the gain adjustment of the member is removed from sound mixing results and then outputting is conducted while for the member participating the conference which does not exist the sound mixing list, the sound mixing results are output. By means of the PSTN teleconference sound mixing method, influences on effects by echoes and background noise are reduced, conference quality is effectively improved; the number of sound mixing at the same time is increased, overflowing of mixed sound is avoided, and meanwhile, the volume of the sound will not be changed suddenly; the effect of conference clipping is improved, the difficulty of clipping is avoided, and frequent switching is avoided.

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.

An active delay device in a streaming media transmission system based on a universal series bus is provided and comprises a transmission delay determining unit, an actuating delay determining unit, an intrinsic delay determining unit, an intrinsic delay, a comparator, an active delaying arrangement unit, an active delay value, wherein the intrinsic delay is used for calculating each terminal device according to the transmission delay and the actuating delay, and the active delay value is used for determining each terminal device according to a maximum intrinsic delay value and the intrinsic delay of each terminal device. The terminal devices which need to perform control commands in the same frequency can accurately be synchronized, or each terminal device can perform each action according to strict time intervals, particularly in a sound mixing system, the fact that each terminal device strictly performs displaying of sound mixing signals at the same time is effectively ensured, and echo is prevented from being generated.

The invention discloses a laser radar and a transmitting module, a receiving module and a detection method thereof, the transmitting module of the laser radar comprises a plurality of lasers, the light emitting wavelengths of the lasers comprise a first wavelength and a second wavelength, and the lasers suitable for emitting light at the same time have different light emitting wavelengths; the receiving module of the laser radar comprises a plurality of detectors, and each detector is suitable for receiving an echo light beam, reflected by a target object, of a laser beam emitted by a corresponding laser in an emission module. By adopting the scheme, the anti-interference capability among a plurality of detectors can be improved, and the signal receiving performance of the laser radar canbe effectively guaranteed.

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.

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 discloses a perforation honeycomb sound absorption integrated plate. The perforation honeycomb sound absorption integrated plate comprises a plate body, the plate body comprises a perforation panel and a perforation bottom plate main body, the two side faces of the perforation panel and the perforation bottom plate main body are mutually overlapped and engaged, penetration holes are formed in the obverse sides of the perforation panel and the perforation bottom plate main body correspondingly, the perforation panel is filled with sound absorption cotton, a honeycomb core is arranged between the perforation panel and the perforation bottom plate main body, the surfaces of the sound absorption cotton and the honeycomb core are coated with composite glue, two hinges are arranged below the plate body side by side, a fixing device is connected to the plate body through the hinges and comprises two fixing inserting plate bodies and a fixing frame, the fixing inserting plate bodies are connected to the hinges, and the fixing frame is embedded into a wall body in mounting. According to the perforation honeycomb sound absorption integrated plate, the structure of the perforation panel and the perforation bottom plate main body is adopted, the built-in honeycomb core is additionally arranged to enable a whole ceiling plate to have a good sound absorption effect, and aftersound can be effectively prevented; and a novel mounting connecting structure is adopted, thus the mounting process of the plate body is simple, mounting and dismounting can be completed only through one-time light pressing, and later-period replacement is facilitated.

The invention discloses an array radar signal transmitting and receiving method under a radio frequency shielding signal. The idea of the invention includes the following steps: transmitting signals by a local side radar, determining interference signals in the signals transmitted by the local side radar, constructing an objective function and solving the objective function, obtaining an optimal detection signal matrix in the signals transmitted by the local side radar, and then simultaneously transmitting the optimal detection signal matrix and the interference signals in the signals transmitted by the local side radar in a radar signal transmitting antenna network, obtaining a radar detection echo signal with low interference after an opposite side target reflects the signals, receivingthe radar detection echo signal with low interference by a radar signal receiving antenna network, fusing and accumulating the received radar detection echo signal with low interference to obtain thefused and accumulated radar detection echo signal, and performing pulse compression processing on the fused and accumulated radar detection echo signal to further obtain the location of the opposite side target, wherein the location of the opposite side target is an array radar signal transmitting and receiving result under the radio frequency shielding signal.

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 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 hardware polishing dust recycling machine. The hardware polishing dust recycling machine structurally comprises recycling equipment, a control switch, a closing door and an exhaust hole, wherein the control switch is fixedly embedded in the side face of the recycling equipment, the closing door is clamped to the side face of the lower end of the recycling equipment, and the exhaust hole is formed in the side face of the lower end of the recycling equipment; a semicircular hole in a scraping mechanism is in clearance fit with a strip-shaped structure on the surface of a barrier plate, so that magnetic dust is prevented from being crushed and adhered to the surface of the barrier plate under an acting force of a plastic plate, the effect of cleaning the magnetic dust is achieved, and the magnetic dust is prevented from being attached to the surface of a barrier mechanism; a fixed fixing mechanism is used for scraping and cleaning a rotating plate in a cleaning structure, so that a movable mechanism is compressed through a spring rod, solidified dust is prevented from sliding through fixing effect of a stress plate on the right side of a rubber sleeve on dust, and the solidified dust is prevented from being clamped in the stress plate under blocking of the rubber sleeve; therefore, the dust is cleaned under the acting force of movement, and the solidified dust is prevented from blocking subsequent dust collection.

The invention relates to the technical field of electronic equipment, in particular to a microphone monomer capable of suppressing resonance oscillation. The microphone monomer comprising a voltage input end, an inductor, a biasing circuit, an amplifier, an equalizer, a buffer and a filter is established, wherein the equalizer is arranged between the amplifier and the buffer. With the adoption of the technical scheme, the microphone monomer has the benefits that the requirements of a microphone for frequency response are met, the effect that the high frequency is suppressed is achieved, the frequency required to be eliminated is eliminated, an audio signal achieves an expected effect through being adjusted by the equalizer, and the quality after audio signal transmission is effectively improved.

A button telephone apparatus comprises an IP trunk for simultaneously making voice communication and data communication using the same communication line connected to an external IP network, and for monitoring the traffic of data-based packets in data communication, and a controller for increasing or decreasing the number of voice channels for making voice communication in accordance with a change in the traffic of data-based packets.

An object of the invention is providing a method and device for packet acoustic echo cancellation. The echo cancelling device obtains one or more source voice packet streams in a multi-party call, selects packets from the one or more source voice packet streams so as to obtain a broadcasted stream corresponding to the multi-party call, cancels echo in a target packet stream corresponding to the broadcasted stream based on a reference packet stream corresponding to the broadcasted stream, so as to obtain the echo-cancelled packet stream corresponding to the target packet stream, and finally broadcasts the echo-cancelled packet stream to participants in the multi-party call. Compared with the prior art, the present invention realizes packet acoustic echo cancellation for a multi-party call, reduces the buffer consumption, channel allocation and corresponding overheads of maintenance and signaling for packet acoustic echo cancellation, enhances the performance of packet acoustic echo cancellation, and makes the performance of packet acoustic echo cancellation independent of the number of participants.

By the present invention are disclosed a method for providing and a method for obtaining voice call related information from a first party device (100) to a second party device (200), prior to establishing a voice call between the first party device (100) and the second party device (200). Portable communication devices (100, 200, 500) for providing and obtaining of voice call related information also disclosed. The methods comprises sending / obtaining in real time the voice call related information (steps 304, 402) from the first party device (100) to the second party device (200) over a packet switched network, and sending / obtaining a call setup message (steps 308, 410) over a circuit switched network, of the voice call from the first party device (100), so that the voice call related information can be presented to a user of the second party device (200) before responding to the call setup message.

The invention discloses an echo-preventing wall board. The echo-preventing wall board comprises a perlite board, wherein the perlite board is internally provided with a plurality of cavities; the cavities are arranged along the width direction of the perlite board and are uniformly distributed in the height direction of the perlite board; a honeycomb-shaped supporting piece is arranged on one face of the perlite board; a plurality of micro-pores which are communicated with the cavities are formed in one face, which is provided with the honeycomb-shaped supporting piece, of the perlite board; sound absorption materials are stuck on the inner wall and the bottom face of the honeycomb-shaped supporting piece; the cavities of the perlite board are internally filled with sound absorption materials; a magnesium oxychloride cement board is arranged on the other face of the perlite board; one faces, which are far away from each other, of the honeycomb-shaped supporting piece and the magnesium oxychloride cement board are provided with a first decorative face layer and a second decorative face layer. According to the echo-preventing wall board, the combination of the honeycomb-shaped supporting piece, the cavities of the perlite board and the sound absorption materials is sufficiently utilized to effectively absorb and attenuate sound waves so that the aim of preventing echoes is realized.

The invention discloses a code interpolation fusion-based radar communication integrated signal realization device and belongs to the radar communication technical field. With the device adopted, a problem that the electric level of the distance sidelobe of radar signals in integrated signals is too high can be solved, and a radar detection function and communication function can be simultaneouslycompleted. The device includes a radar transmitting end, a communication receiving end and a radar receiving end; and the radar transmitting end is used for acquiring the optimal integrated signal vector of a communication signal vector. According to the acquisition idea of the optimal integrated signal vector, the communication signal vector is determined, and an integrated signal vector is obtained on the basis of code interpolation fusion; the autocorrelation sidelobe electric level vector of the integrated signal vector is calculated according to the integrated signal vector; the target optimization function of the integrated signal vector is constructed according to the autocorrelation sidelobe electric level vector of the integrated signal vector; and the target optimization function of the integrated signal vector is optimized, so that the optimal integrated signal vector of the communication signal vector can be obtained.

A method and apparatus are disclosed for canceling acoustic echo generated during transmission of text information in a communication system supporting a TTY / TDD service. When an mobile-to-land call is established between a mobile subscriber and a PSTN subscriber, a decoder notifies an encoder of detection of TTY / TDD text in a BS vocoder. The encoder then transmits a packet having silence information, which prevents acoustic echo reproduction of the text in the TTY / TDD device.

The invention relates to a display device and an audio processing method, and is applied to the technical field of audio processing, the display device comprises a controller configured to perform sound separation and sound effect enhancement processing on acquired first audio data to obtain first target audio data and second audio data; performing gain processing on the first target audio data according to the first gain to obtain second target audio data; performing gain processing on the second audio data according to a second gain to obtain third audio data, the first gain and the second gain being determined according to a sound control mode corresponding to the display device; performing delay processing on the second target audio data or the third audio data so as to synchronize the second target audio data and the third audio data; merging the second target audio data and the third audio data to obtain fourth audio data; and an audio output interface configured to output the fourth audio data. According to the invention, the audio-video time delay can be reduced.

The invention discloses a group session-based audio playing method and device, a group session-based equipment management method and device and computer equipment, and belongs to the field of audio data processing. In the group session process based on the cloud technology, an audio watermark is added to to-be-played audio data, and the audio watermark is associated with a device identifier of a terminal, so that the audio watermark can indicate which terminal the audio data is played, and when other terminals collect the audio data, which terminals are located in the same space can be determined according to the audio watermark, and the subsequent equipment management,such as equipment muting or earphone access, of a user is facilitated. Audio played by a loudspeaker of a certain terminal is prevented from being repeatedly collected by microphones of other terminals in the same space, and echo and howling are prevented from being generated in the session process. And the session quality of the group session is improved.

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 invention discloses a ceramic tile paving device with good sound insulation and a laying method thereof. The ceramic tile paving device comprises a supporting frame, the supporting frame is of a grid structure composed of a plurality of mutually perpendicular transverse supporting segments and longitudinal supporting segments, the ceramic tile laying device further comprises a plurality of supporting columns, the supporting columns are detachably mounted on a mounting platform body, height adjusting structures are arranged at the bottoms of the supporting columns, a sound insulation structure is arranged at the bottom of each mounting cavity, and the sound insulation structure from bottom to top successively comprises a substrate layer, a sound insulation damping layer, a spacer layer,and a sound absorbing layer. By adjusting the height of the supporting columns, paving and leveling of a ceramic tile with the curved bottom surface are realized, so that paving of the ceramic tile with the curved bottom surface is simpler and faster, the cost is saved, and replacement of the ceramic tile is convenient; and the sound insulation structure is arranged in the mounting cavity below the ceramic tile to isolate noise between an upper floor and a lower floor, and interference of noise radiated by vibration of ground objects upstairs on downstairs is reduced.

The invention discloses an anti-echo wall panel, which includes a perlite board. Several cavities are provided inside the perlite board. The cavities are arranged along the width direction of the perlite board and in the height direction of the perlite board. Evenly distributed on the surface, one side of the perlite board is provided with a honeycomb support piece, and the side of the perlite board with the honeycomb support piece is provided with several micropores connected to the cavity, and the inner wall and bottom surface of the honeycomb support piece are bonded with sound-absorbing material, the cavity of the perlite board is filled with sound-absorbing material; the other side of the perlite board is provided with a magnesium oxychloride cement board, and the side of the honeycomb support and the magnesium oxychloride cement board away from each other is provided with a first facing layer and a Second facing layer. The invention makes full use of the combination of honeycomb supports, cavities of perlite boards, and sound-absorbing materials to effectively absorb and attenuate sound waves to achieve the purpose of preventing echoes.

The invention belongs to the technical field of building design, and particularly relates to a passive building design integrated system. The passive building design integrated system comprises a wallbody, a roof, a heat storage cellar, silencing top and a monitoring module; the wall body comprises a wall body base course, a heat insulation layer and a protective layer, and the top of the wall body is provided with the roof; the roof comprises an upper top, a shading eave, a lower top, a vertical window and a solar panel; the bottom of the wall body is provided with the heat storage cellar which comprises a heat storage insulating layer, heat storage pipes and a heat collector; the bottom of the roof is provided with the silencing top; the top of the right side wall of an inner cavity ofthe wall body is provided with the monitoring module, heat preservation can be conducted through a geothermal source, the stability is high, the cost is low, the indoor heat insulation effect is improved, the heat recycling rate is increased, meanwhile, the indoor environment can be monitored, and the indoor air pressure, temperature and humidity are detected and fed back; and the passive buildingdesign integrated system is connected with IP terminals such as a mobile phone and a computer of a user, and the user can conveniently and remotely observe the indoor living environment.

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.