Hefei Aichuangwei Electronic Technology Co., Ltd.

Zoom Communications, Inc.

Hefei University of Technology

Hefei General Machinery Research Institute Co., Ltd

Chinese Academy of Sciences

Hefei Cosource Pharmaceutical Co., Ltd.

Wei Wang

Ke Wang

Dianwu Li

Lei Han

Lei Qiu

Jun Pan

Lixiang Wen

Lixiang Xu

Zhaofeng Jia

Yuhui Chen

Kejun Xu

Ziwen Shen

Wenjiao Zhu

Min Fang

You Ming

Hongbing Yu

Shengtao Geng

Xiaojie Ye

Qin Wang

Fengguan Chen

Fenfen Ji

Example methods and systems provide machine-learning assisted acoustic echo cancellation (AEC). The AEC can be used, as an example, to improve the audio quality for online audio and video conferences. A system according to this disclosure includes a pre-trained, machine-learning, AI model designed to detect, in real time, a unitary voice signal, or a signal representing the speech of a single speaker as opposed to that of multiple speakers. A digital signal processing (DSP) algorithm can then detect the echo state, for example, whether distortion results primarily from an echo. Based on these characteristics, the system can, alternatively and automatically apply either a default mode of AEC to the audio signal, or apply a more aggressive mode of AEC.

Machine-learning assisted acoustic echo cancelation

A champagne tower-type multi-stage throttle control valve includes a valve body, a valve cover, a throttle sleeve, and a valve core. A sleeve cavity of the throttle sleeve is shaped as a stepped hole with two or more layers. The valve core is shaped as a stepped shaft with two or more layers coaxial with the throttle sleeve. The number of shaft shoulders of the valve core is smaller than or equal to the number of hole shoulders of the sleeve cavity of the throttle sleeve, such that each set of shaft shoulders of the valve core in an axial direction can form a sealing surface fit with corresponding hole shoulders of the throttle sleeve. A flow channel groove is axially or obliquely formed on each of the hole shoulders of the throttle sleeve and/or the shaft shoulders of the valve core.

Champagne tower-type multi-stage throttle control valve

A constant current generation circuit for optocoupler isolation amplifier and a current precision adjustment method are provided. The constant current generation circuit includes a start circuit, a current generation circuit and a precision adjustment and output circuit integrated into a same substrate. The start circuit can generate and output a first start current and a second start current. The current generation circuit includes a negative temperature change rate current generation circuit connected to a first start current output and a positive temperature change rate current generation circuit connected to a second start current output. The precision adjustment and output circuit outputs constant current meeting application requirements of optocoupler isolation amplifier by adjusting proportional precision of two currents output from a current generation circuit.

Constant current generation circuit for optocoupler isolation amplifier and current precision adjustment method

Disclosed is a circuit for shifting a fixed ground level to a floating ground level in a motor drive system, including a floating ground high level line, a floating ground output level line, a floating ground low level line, a normal input level line, and a normal ground line that are used for characterizing an application detail. The circuit includes a controlled switching current source, a first upper current rectifier, a second upper current rectifier, a lower current rectifier, and an amplifying and shaping circuit that are integrated on a same substrate.

Circuit for shifting fixed ground level to floating ground level in motor drive system

Disclosed is a circuit for converting a temperature change amount into a voltage change amount in a motor drive system, including a positive temperature change rate voltage generation module, a circuit bias module, and a temperature detection module that are integrated on a same substrate. An external power supply voltage is processed by the positive temperature change rate voltage generation module and the circuit bias module, and then inputted to the temperature detection module. The temperature detection module detects in real time the temperature change amount in the motor drive system, convert the temperature change amount into the voltage change amount, and transfer the voltage change amount to the circuit bias module, to allow the circuit bias module to output the voltage change amount. In this way, the conversion from the temperature change amount into the voltage change amount is realized.

Circuit for converting temperature change amount into voltage change in motor drive system

The present disclosure provides a start-up initialization circuit of motor drive system, including a power amplitude detecting and internal power supply module, a controlled delay module, a waveform shaping module and a power supply judging and adjusting module integrated on a same substrate, configured to detect and manage a voltage change of each node of a drive system in real time to cause a motor drive system to realize a start-up initialization process transit from an off state to a normal working state. The present disclosure finally forms the start-up initialization circuit of motor drive system by integrating the power amplitude detecting and internal power supply module, the controlled delay module, the waveform shaping module and the power supply judging and adjusting module and integrating on a single chip, which greatly ensures the reliability of power on and start-up of the motor drive system.

Start-up initialization circuit of motor drive system

An ultrasonic gas flow meter based on FPGA and DSP consists of ultrasonic gas transducers and sensor components, transmitting/receiving signal channel switch circuits, a driving signal generation and amplification circuit, an echo signal conditioning and collection circuit, a time sequential controlling and signal processing circuit, a man-machine interface, a serial communication module and a power management module, propagation time of ultrasonic echo waves is calculated by adopting a variable ratio threshold and zero-crossing detection method of tracking maximum peak of the echo signal to obtain gas flow rates.

Ultrasonic gas flow meter based on FPGA and DSP

Growing community of inventors

Hefei, China

Wei Wang