41results about How to "Echo Cancellation" patented technology

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 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 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 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 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.