41results about How to "Echo Cancellation" patented technology

The embodiment of the invention relates to a voice signal de-noising and pickup processing method and apparatus, and a refrigerator. The method comprises: a microphone array collects voice signals of a current environment; time synchronization is carried out on the collected multi-path voice signals; and weighting and summation are carried out on the synchronized multi-path voice signals to obtain voice signals after denoising. With a self-filtering way, the bandwidth is reset, so that the voice quality can be improved; the voice characteristic is protected from being changed based on a weight adding way; the echo can be eliminated effectively; the signal to noise ratio can increase; and the area of interest can be enhanced by using the direction selection characteristic.

The invention discloses an echo cancellation method and device for a microphone. The echo cancellation method for the microphone comprises the following steps: an input analog audio signal is obtained through acoustic information acquired through the microphone; according to a set sampling frequency, the analog audio signal is sampled and calculated to obtain an input digital audio signal; according to a set echo smoothing threshold range, the digital audio signal is subjected to echo cancellation smoothing to obtain a digital audio signal after smoothing; the digital audio signal after smoothing is transmitted to a correspondent node after being subjected to data compression and packaging. The invention further discloses the device used for implementing the echo cancellation method.

The present invention relates to a communication device and a telephone communication method thereof. The present invention includes two or more microphones mounted at different positioned in a predetermined space, e.g., in a vehicle. Further, a detector compares selectively the signal-to-noise ratios, sound quality states, volume intensities or the like of signals input through the microphones, and detects the most optimal signal as a telephone communication signal in the signals. Echo and / or howling contained in the input signal when one talks over the telephone with a communication counterpart is removed through an echo remover in accordance with the control operation of a controller. Furthermore, if signals are input to the others of the microphones while the telephone communication is performed, the telephone communication is continuously performed by comparing the input signals with the signal input to the microphone through which the telephone communication has been performed and selecting a microphone with the most optimal telephone communication signal. Accordingly, there is an advantage in that occupants except a driver can conveniently talk over the telephone using any one of two or more microphones installed in a vehicle, and the telephone communication can be performed with an optimal telephone communication signal although a talker is changed.

The invention relates to distributivity phoneme communication system and network connecting method applied in residential district. It includes management layer, middle layer, and user layer. The management layer includes center monitoring controlling main engine and supervisor used to monitor, control, and supervise the whole system. The middle layer includes doorway machine used as assistant dividing management unit. The user layer includes user subset used to interact with the user. The system sets coding management mechanism used storey as unit, the first map used to store doorway machine information in server and supervisor, and the second map used to store the subset information in the doorway machine. The invention has the advantages of low cost, convenient maintenance operation, strong function and expansibility.

A broadcast intercom system based on an IP network comprises an IP network intercom host, an IP network intercom extension and an IP network address box, wherein the IP network intercom host, the IP network intercom extension and the IP network address box achieve mutual communication through an LAN or a WAN. The IP network intercom host comprises a first voice collecting module and a core processer integrated with a first duplex echo elimination circuit; the IP network intercom extension comprises a second voice collecting module and a core processor integrated with a second duplex echo elimination circuit. The first voice collecting module includes a first programmable amplifier; the second voice collecting module includes a third programmable amplifier. The audio sampling rate during analog-digital conversion of the first programmable amplifier and the third programmable amplifier is 32 K. According to the broadcast intercom system, the sound effect of a duplex intercom is well improved.

The invention discloses a method for eliminating the echo of a receiver from an opposite side in a handfree state of a mobile phone. The method comprises the following steps of acquiring a sound signal transmitted from the opposite side when the handfree mode in the mobile phone of one side is opened; reversely operating the acquired sound signal transmitted from the opposite side; acquiring a sound signal of the receiver of the mobile phone from the one side; carrying out overlay processing on the sound signal, transmitted from the opposite side and subjected to the reversed operation, and the sound signal of the receiver of the mobile phone from the one side. The method disclosed by the invention is simple and practical; the echo of the receiver from the opposite side is eliminated by reversed operation and overplay processing on the sound signal, so that the call quality of two sides for communication is improved. In addition, the invention also discloses a device for eliminating the echo of the receiver from the opposite side in the handfree state of the mobile phone.

The invention discloses a microphone echo elimination method, the method is applied to a terminal, the terminal comprises a loudspeaker and a microphone which are in communication connection, and themicrophone comprises a main microphone and an auxiliary microphone. The method comprises the following steps that a loudspeaker receives an audio signal to generate vibration, and the loudspeaker vibrates to generate sound waves and cause vibration of a machine shell; the main microphone picks up the sound wave to obtain a first signal, the main microphone picks up the casing vibration to obtain asecond signal, and the auxiliary microphone picks up the casing vibration to obtain a third signal; the echo in the first signal is eliminated according to a preset algorithm, the second signal is processed according to the third signal, and the echo in the second signal is eliminated; and the first signal after echo cancellation and the second signal after echo cancellation are synthesized and output. The invention further discloses a microphone echo elimination device and equipment and a computer storage medium. According to the invention, the accuracy of microphone echo elimination is improved.

The invention discloses a system and a method for eliminating echo and howling in network sound transmission. On one hand, the method for eliminating echo and howling in the network sound transmission provided by the invention comprises the following steps: desampling audio signals which are inputted from a far end in real time so as to obtain first processed audio signals; desampling mixed audio signals of sound, which is acquired by virtue of a microphone and is transmitted from a sound box, and sound which is inputted from a near end in real time so as to obtain second processed audio signals; extracting and up-sampling signals, which are related to the first processed audio signals, in the second processed audio signals in real time so as to obtain third processed audio signals; and eliminating signals, which are related to the third processed audio signals, in the mixed audio signals acquired by virtue of the microphone so as to obtain output audio signals from which echo and howling are eliminated. On the other hand, the invention provides a system for eliminating echo and howling in the network sound transmission. With the application of the method and the system provided by the invention, echo and howling in the network sound transmission can be effectively eliminated, so that audio quality is guaranteed.

The invention discloses a communication device and a receiving method thereof. The communication device comprises a digital / analog converter, a reverse part response filter circuit and an analog / digital converter, wherein the digital / analog converter is used for receiving a first digital signal to generate an analog signal in a pulse form; the reverse part response filter circuit is used for receiving a difference signal generated by subtracting a receiving signal by the analog signal in a pulse form and adjusting the response of the reverse part response filter circuit so as to generate an adjusted signal; and the analog / digital converter is used for carrying out digital / analog conversion on the adjusted signal so as to generate a second digital signal.

The invention belongs to the technical field of sound collection, and specifically relates to a microphone-based structure assembly, and a sound box. The microphone-based structure assembly comprises:a housing comprising a bearing layer on the outer side and a sealing and damping layer on the inner layer, wherein the bearing layer and the sealing and damping layer are of an integrally formed structure, a through hole is formed in the housing, and the through hole penetrates through the bearing layer and the sealing and damping layer in sequence to form a pickup channel with a first port and asecond port; and a microphone arranged at the second port of the pickup channel and in interference fit with the sealing and damping layer. According to the microphone-based structure assembly provided by the invention, the bearing layer and the sealing and damping layer of the housing are integrated, so that the formed pickup channel has no hollow cavity, in this way, the echo generated by the hollow cavity is eliminated, and the accuracy of voice recognition is improved; and in addition, the assembly step of the sealing and damping component is simplified, and the assembly efficiency of thestructure assembly is improved.

The invention discloses a method for realizing signal transmission between a fire-fighting telephone host and extensions, and the method comprises the steps that the fire-fighting telephone host issues an inspection command to each fire-fighting telephone extension in real time, and when the fire-fighting telephone host needs to communicate with the fire-fighting telephone extension of a certain address, the fire-fighting telephone host sends a communication command to the address; the fire-fighting telephone extension generates ringing after receiving the instruction; the fire-fighting telephone extension returns an off-hook command to the fire-fighting telephone host after off-hook; when the fire-fighting telephone host starts a call after detecting an off-hook command, the fire-fightingtelephone host issues a signal in a digital modulation mode, the fire-fighting telephone extension demodulates the signal after receiving the signal issued by the fire-fighting telephone host, and the signal is processed by the DAC to restore a voice signal; and after the call is ended and the hang-up is finished, the fire-fighting telephone host lists the fire-fighting telephone extension address into the inspection range again. Through the above scheme, the method achieves the purposes of high conversation quality and no interference, and has very high practical value and popularization value.

A circuit for canceling echo and sidetone in a switching system connecting first and second subscribers, comprising a first linear converter, a sidetone canceling filter, a limiter, a first PCM converter, a second linear converter, echo cancellation filter, and a second PCM converter.

The invention belongs to the technical field of voice communications and particularly relates to an echo elimination method and apparatus applied to a building intercom system. The echo elimination method comprises the following steps of initializing echo elimination processing parameters; receiving reference echo audio data; and processing to-be-processed audio data and the reference echo audio data to obtain audio data after echo elimination. According to the technical scheme provided by the method and the apparatus, the echo elimination effect can be conveniently and quickly achieved; and meanwhile, the limitation of a short delay requirement in an existing echo elimination technology is overcome, and echo elimination also can be carried out for the situation of long delay time.

The invention discloses a voice call echo cancellation method and system, a storage medium, and an electronic device, and relates to the field of IP voice technology. The method comprises the following steps: obtaining a preset delay frame number of a user, and a position size of a memory occupied by an audio frame in audio playing and audio recording; applying for a first space for storing playing audio data in the memory, and defining a position for storing the playing audio data in the first space; when an audio playing thread needs to obtain the playing audio data, calling an audio playingfunction to store the current playing audio data at the beginning of the position for storing the playing audio data; when an audio recording thread generates audio collection data, calling an audiorecording function to obtain playing audio data of the position size of the memory occupied by an audio frame from the beginning position of the first space to serve as echo reference data; and calling an echo cancellation function to perform echo cancellation. By adoption of the voice call echo cancellation method and system, the synchronous alignment of the audio recording and playing can be ensured, and the echo recorded by the microphone can be effectively cancelled.

The invention discloses an echo cancellation system, method, device and equipment and a computer readable storage medium. The system includes a signal processing module, a power amplifier module, a loudspeaker, a signal processing module and a sound collection module. The signal processing module is connected with the power amplifier module and used for transmitting a first playing signal to the power amplifier module, the power amplifier module is connected with the loudspeaker and used for receiving the transmitted first playing signal, processing the first playing signal to generate a second playing signal, and transmitting the second playing signal to the loudspeaker and the signal processing module, the loudspeaker is used for receiving and playing the second playing signal, the signal processing module is used for receiving and storing the second playing signal, the sound collection module is connected with the signal processing module and used for collecting the sound signal andtransmitted the sound signal to the signal processing module, the signal processing module is used for receiving the sound signal, the sound signal is subjected to noise reduction treatment accordingto the second playing signal, an echo cancellation signal is generated, and thoroughness of the echo cancellation is ensured.

A multi-user voice cooperation system based on a communication network comprises a bottom layer API module used for data transmission and bottom layer configuration; information is sent and serialized to a connection management module through the underlying API module, and the connection management module is used for being responsible for network client management and network server management; an object state and behavior module which is used for processing network identities and network behaviors; an object life cycle module which is used for managing a network scene and a client scene; and an engine integration module which is used for integrating various components including a network position component, a network animation component and a network distance inspection component; the system is technologically characterized in that: a vivid voice interaction scene is established and presented through an audio equipment system on a computer to give students an immersive feeling, so that the learning interest of the students is stimulated, and the manual operation ability of the students is improved; the system supports simultaneous on-site learning of multiple persons, breaks through the limitation of traditional education, and improves the teaching efficiency.

The invention provides a method and device for eliminating sidelobe echoes of a millimeter wave cloud radar. The method comprises the steps that radar detection mode key parameters and radar base dataare acquired; sidelobe echoes in the radar base data are marked according to a preset rule and radar detection mode key parameters; sidelobe echoes in the radar base data are removed to acquire corrected radar base data. The method is advantaged in that sidelobe echoes in the radar base data can be eliminated, a problem of cloud-precipitation meteorological echo pollution caused by distance sidelobe echoes caused by millimeter wave cloud radar wide pulse detection is solved, the quality of radar detection data can be effectively improved, and an important data basis is provided for application of the millimeter wave cloud radar in the meteorological field and the civil aviation field.

The embodiment of the invention discloses a volume adjustment method and device, an apparatus and a memory medium. The method comprises the steps of receiving an environment sound signal collected byat least one microphone; and adjusting local output volume according to the environment sound signal and a sound signal output by a local, thereby enabling the local output volume is lower than environment volume. Through application of the technical scheme provided by the invention, the echo interference can be improved, and the user experience can be improved.

A sound output control method and a sound output control system are applied to the technical field of electronic devices and communication, and the method comprises the following steps: establishing data connection with searched audio and video acquisition equipment in a local area network to which the audio and video acquisition equipment belongs; when the ultrasonic audio modulation mode switching instruction is triggered, controlling each dual-mode loudspeaker in a sound amplification matrix to enter an ultrasonic audio modulation mode, and enabling each dual-mode loudspeaker to output sound picked up by a microphone in an ultrasonic carrier mode; adjusting the sound output direction of a target dual-mode loudspeaker corresponding to the target user; and when the audio broadcasting modeswitching instruction is triggered, controlling each dual-mode loudspeaker to enter an audio broadcasting mode. According to the method and the system, dual-mode sound output and free switching of ultrasonic directional sound output and general audio broadcasting can be realized.

The invention discloses a method for eliminating the echo of a receiver from an opposite side in a handfree state of a mobile phone. The method comprises the following steps of acquiring a sound signal transmitted from the opposite side when the handfree mode in the mobile phone of one side is opened; reversely operating the acquired sound signal transmitted from the opposite side; acquiring a sound signal of the receiver of the mobile phone from the one side; carrying out overlay processing on the sound signal, transmitted from the opposite side and subjected to the reversed operation, and the sound signal of the receiver of the mobile phone from the one side. The method disclosed by the invention is simple and practical; the echo of the receiver from the opposite side is eliminated by reversed operation and overplay processing on the sound signal, so that the call quality of two sides for communication is improved. In addition, the invention also discloses a device for eliminating the echo of the receiver from the opposite side in the handfree state of the mobile phone.

The invention discloses a circuit of medical communication equipment. The circuit comprises a signal gating circuit, a coding-and-decoding circuit and an echo eliminating circuit. The signal gating circuit is connected with the decoding output end of the coding-and-decoding circuit and the input end of the echo eliminating circuit. The input end of the echo eliminating circuit is connected with the decoding output end of the coding-and-decoding circuit. The output end of the echo eliminating circuit is connected with the coding input end of the coding-and-decoding circuit. The signal gating circuit is used for determining for gating the audio signal transmission line of a local microphone or the audio signal transmission line of a handle microphone according to a received gating control signal. The signal gating line transmits the audio signal which is acquired by the local microphone or the handle microphone to the echo eliminating circuit through the audio signal transmission line ofthe local microphone or the handle microphone, and transmits the audio signal which is transmitted by the decoding output end to power amplifier equipment which corresponds with the local microphoneor the handle microphone. The circuit of the medical communication equipment, and the medical communication equipment have advantages of realizing communication line switching of the medical communication equipment, improving communication quality and transmitting the audio signal through using the network as a medium.

The invention discloses a microphone echo cancellation method, the method is applied to a terminal, the terminal includes a speaker and a microphone connected by communication, and the microphone includes a main microphone and a secondary microphone; the following steps are included: the speaker receives an audio signal and generates vibration , the speaker vibrates to generate sound waves and cause the casing to vibrate; the main microphone picks up the sound waves to obtain a first signal, the main microphone picks up the casing vibrations to obtain a second signal, and the auxiliary microphone picks up the casing vibrations to obtain a third signal; Eliminate the echo in the first signal according to a preset algorithm, process the second signal according to the third signal, and eliminate the echo in the second signal; The second signal is synthesized and output. The invention also discloses a microphone echo cancellation device, equipment and computer storage medium. The invention improves the accuracy of microphone echo cancellation.

The invention relates to a method for transmitting two-tone multi-frequency signal, when there is prepositioned echo counteract device. Wherein, said method improves the EC algorithm module, to output two data groups, while one group is not treated by NLP treatment and another group is treated by NLP treatment; the data not treated by NLP is used in DTMF detection of signal sound; if the DTMF number is not detected, treating it as general voice signal and outputting the data treated by NLP to the code / decode module to be coded; if the DTMF number is detected, outputting the data not treated by NLP to the code / decode module; the invention also uses data buffer mechanism. The invention can realize normal echo counteraction to reach ideal voice quality; and based on the signal inside the DTMF band, it can eliminate echo without hurting signal; therefore, the integrated DTMF can be transmitted to the opposite.

The invention discloses a tunnel bidirectional visual voice intercom method, a robot and a system. The system comprises a control module and a bidirectional voice intercom module connected with the control module, wherein the bidirectional voice intercom module comprises an echo cancellation unit; and the echo cancellation unit can detect voice information of remote monitoring personnel and / or maintenance personnel in a tunnel, and filter out echo signals contained in the voice information of the maintenance personnel in the tunnel by generating predicted echo signals. According to the method, the robot and the system, a bidirectional voice intercom function of the tunnel inspection robot is designed, so that bidirectional visual intercom can be carried out inside and outside the tunnel without moving signals, the working communication efficiency between the maintenance personnel in the tunnel and background monitoring personnel is effectively improved, and the personal safety of theinspection maintenance personnel is guaranteed.

The embodiment of the invention discloses a volume adjustment method and device, an apparatus and a memory medium. The method comprises the steps of receiving an environment sound signal collected byat least one microphone; and adjusting local output volume according to the environment sound signal and a sound signal output by a local, thereby enabling the local output volume is lower than environment volume. Through application of the technical scheme provided by the invention, the echo interference can be improved, and the user experience can be improved.

A broadcast intercom system based on an IP network, comprising an IP network intercom host, an IP network intercom extension, and an IP network address box that realize mutual communication through a local area network or a wide area network; the IP network intercom host, the IP network intercom extension Respectively comprising a first voice acquisition module and a core processor integrated with a first duplex echo cancellation circuit, a second voice acquisition module and a core processor integrated with a second duplex echo cancellation circuit, the first voice acquisition module and The second voice collection module includes a first programmable amplifier and a third programmable amplifier respectively, and the audio sampling rate when the first programmable amplifier and the third programmable amplifier perform analog-to-digital conversion is 32K. The invention well improves the sound effect of the duplex intercom.

The invention discloses a system and a method for eliminating echo and howling in network sound transmission. On one hand, the method for eliminating echo and howling in the network sound transmission provided by the invention comprises the following steps: desampling audio signals which are inputted from a far end in real time so as to obtain first processed audio signals; desampling mixed audio signals of sound, which is acquired by virtue of a microphone and is transmitted from a sound box, and sound which is inputted from a near end in real time so as to obtain second processed audio signals; extracting and up-sampling signals, which are related to the first processed audio signals, in the second processed audio signals in real time so as to obtain third processed audio signals; and eliminating signals, which are related to the third processed audio signals, in the mixed audio signals acquired by virtue of the microphone so as to obtain output audio signals from which echo and howling are eliminated. On the other hand, the invention provides a system for eliminating echo and howling in the network sound transmission. With the application of the method and the system provided by the invention, echo and howling in the network sound transmission can be effectively eliminated, so that audio quality is guaranteed.

The invention relates to the field of intelligent control, and in particular to an intelligent conference system based on Bluetooth. The system is provided with a power amplifier circuit and an arraydigital microphone. The volume of the sound output by the loudspeaker is controlled by the power. The main purpose of the power amplifier circuit is to output a high-power signal. Therefore, the poweramplifier circuit is matched with the loudspeaker to solve the problem that the mobile phone loudspeaker is small in sound and cannot hear the sound of the opposite side clearly. Meanwhile, the arraydigital microphone is composed of a plurality of MEMS digital microphones which are arranged in an array mode, the 360-degree omnidirectional audio signal acquisition range is achieved, the sound source acquisition range is wide, and the problem that the microphone needs to be close to the microphone due to the fact that the pickup range of the microphone is small is solved. The system comprisesa DSP audio optimization circuit. The DSP audio optimization circuit has the effect of optimizing audio signals and can effectively eliminate echoes and environmental noise, that is, high noise and background noise are filtered out from an audio signal source, so that the call quality is remarkably improved, and meanwhile, the problem that environmental noise interference cannot be effectively suppressed during a call is solved.