Lansus Technologies Inc

Huawei Technologies Co., Limited

Future Wei Technologies, Inc.

Shenzhen Huiding Technology Co., Ltd.

Hua Long

Qian Zhao

Liyang Zhang

Zhenjuan Cheng

Dongjie Tang

Feng Wang

Laurence Alan Thompson

Zhenxing Zhang

Le Yuan

Jiahui Zhou

Jiong Huang

Yong Su

Zhigui Wei

Yuanlong Jiang

Shucheng Liu

Weiping Xu

Jiashuai Guo

Bin Hu

Jiandong Ke

Weiguang Zhou

Zhaohua Qian

Hongwei He

Xinghuo Zhu

Kai Xuan

Guang Qian

Junhao Jin

Embodiments of this application disclose a video switching method and a related device, and are applied to the multimedia field. The method in embodiments of this application includes: A video transmit end receives a video switching instruction when sending a first video frame, where the first video frame is one frame of video data of a first video stream that is being sent by the video transmit end; and the video transmit end switches video data in response to the video switching instruction when a first field blanking period after the first video frame arrives. In embodiments of this application, a video data switching process of the video transmit end may be controlled to occur in the field blanking period, and the video transmit end always sends a complete video frame to a video receive end.

Video switching method and related device

A transmission method, apparatus, and system implement bidirectional transmission of an audio/video signal between peer devices. The transmission system may include a first transmission apparatus and a second transmission apparatus, where the first transmission apparatus is connected to the second transmission apparatus through a first cable, and the first cable includes a first number of main downlink lanes and a second number of main uplink lanes. Bidirectional transmission of the audio/video signal between the first transmission apparatus and the second transmission apparatus is performed through the first cable.

Transmission method, apparatus, and system

A matching circuit, a radio frequency front-end power amplification circuit, and a mobile communication device are provided. The matching circuit is configurable for the radio frequency front-end power amplification circuit, including a first impedance matcher, a first bandpass filter, a first wave trap, and a first matching unit. An impedance of the first impedance matcher is a first preset impedance at a first frequency, the first bandpass filter is bridged between a front end of the first impedance matcher and ground, the first bandpass filter enables a signal of the first frequency to pass through, and suppresses at least one of a signal of a second frequency and a signal of third harmonic generation of the first frequency. The second frequency is lower than the first frequency. The first wave trap is bridged between a rear end of the first impedance matcher and the ground.

Matching circuit, radio frequency front-end power amplification circuit, and mobile communication device

An embodiment provides a packet transmission method and apparatus, to resolve a problem that occurs when a packet cannot traverse a NAT device when VTEPs communicate with each other through the NAT device. The method is applied to a VXLAN including a first VTEP, a second VTEP, and a NAT device. The method includes: performing, by the first VTEP, VXLAN encapsulation on a first packet, obtaining a second packet; sending, by the first VTEP, the second packet to the second VTEP through the NAT device; and performing, by the second VTEP, VXLAN decapsulation on the received second packet, to obtain the first packet. The first packet is a packet to be sent by the first VTEP, a destination port number of the second packet is obtained based on a destination IP address of the second packet, and a source port number of the second packet is a preset port number.

Packet transmission method and apparatus

A circuit structure for improving the harmonic suppression capability of a radio frequency power amplifier includes an output stage unit, a high-order harmonic suppression unit, and a low-order harmonic suppression unit. The output stage unit outputs a signal to be subjected to harmonic suppression; the high-order harmonic suppression unit comprises a first filter capacitor and a back hole, and is used for suppressing fifth or higher harmonics; the output stage unit and the first filter capacitor are connected to the ground in series by means of the back hole; the low-order harmonic suppression unit is connected to the output stage unit to suppress second, third and fourth harmonics. According to the design, the high-harmonic suppression capability of the radio frequency power amplifier is improved.

Circuit structure and method for improving harmonic suppression capability of radio frequency power amplifier

An apparatus for use in a high-definition media interface (HDMI) source device includes an HDMI interface for transmitting video data and metadata to a sink device. The apparatus is configured to encode the metadata in an auxiliary video information (AVI) information frame (InfoFrame). The apparatus is further configured to transmit the AVI InfoFrame during a frame synchronous transmission window (FSTW) of the video data, wherein the FSTW begins during a video blanking interval (VBI) of the video data, on a first video blank pixel that immediately follows a last active video pixel of a preceding video frame or video field and ends a predetermined number of video lines after a start of the VBI.

Frame synchronous packet switching for high-definition multimedia interface (HDMI) video transitions

A multi-mode multi-band power amplifier includes a controller, a wide-band amplifier channel and a fundamental impedance transformer. The controller receives an external signal and outputs a control signal according to the external signal. The wide-band amplifier channel receives single-band or multi-band RF signals through the input terminal, performs power amplification on the RF signals and outputs the RF signals through the output terminal. The fundamental impedance transformer includes a first segment shared by RF signals in all bands, second segments respectively special for RF signals in all bands, and a switching circuit controlled by the controller to separate RF signals subject to power amplification to the second segment in a switchable manner for multiplexed outputs.

Multi-mode multi-frequency power amplifier

A power amplifier gain attenuation circuit includes: a gain attenuation (reduction) circuit configured to receive an input signal, an external drive signal and a bias voltage, and output a secondary input signal after attenuating the input signal depending on the drive signal and bias voltage; an amplifier including: a bias input terminal configured to receive a bias voltage; a signal input terminal configured to receive a secondary input signal, and an output terminal configured to output a gained output signal. The power amplifier gain attenuation circuit can reduce a gain effectively, and the amount of phase jump caused by the attenuation is quite small.

Power amplifier and gain reduction circuit thereof

A power amplifier output power control circuit includes a first operational amplifier with a negative input terminal configured to receive a power control signal; a first PMOS transistor with a grid electrode connected to an output terminal of the first operational amplifier, a source electrode connected to an external power source, and a drain electrode grounded via a voltage dividing network; a power amplifier with a power end connected to the drain electrode of the first PMOS transistor, an input terminal configured to access to a signal to be amplified, and an output terminal configured to amplify the signal; and a current sampling circuit configured to produce sampling current after sampling current across the first PMOS transistor and providing a negative feedback signal for the positive input terminal of the first operational amplifier according to the sampling current such that total output power of the power amplifier keeps unchanged.

Power amplifier output power control circuit

A power amplifier gain switching circuit includes: a gain controller configured to receive an external input signal, output a first input signal, receive an external drive signal, and output a control signal based on the drive signal; an amplifier including: a bias input terminal configured to receive an external bias voltage; a signal input terminal configured to receive the first input signal; a control terminal configured to receive the control signal; and an output terminal configured to output an output signal with a gain; wherein the amplifier is configured to switch a gain factor of the output signal based on the control signal.

Power amplifier and gain switching circuit thereof

A multi-mode multi-band power amplifier and its circuits are provided. The power amplifier comprises a controller, a wide-band amplifier channel, and a fundamental impedance transformer. The controller receives an external signal and outputs a control signal according to the external signal. The wide-band amplifier channel receives a single-band or a multi-band RF signals through the input terminal, performs power amplification on the RF signals and outputs the RF signals through the output terminal. The fundamental impedance transformer comprises a first segment shared by RF signals in all bands, second segments respectively specific to RF signals in all bands, and a switching circuit controlled by the controller to separate a RF signal which is subject to power amplification to the second segment in a switchable manner for multiplexed outputs. A power amplifier output power control circuit, a gain switching circuit, and a gain attenuation circuit are also provided.

Power amplifier device and circuits

A method and a system for enabling a touch controller to be adaptive to a capacitive touch sensor are disclosed. The method may include: step A in which the touch controller detects and samples all the capacitors in the sensor model identification circuit and parses the sampled data; and step B in which the touch sensor selects parameters corresponding to a sensor model in accordance with a parsing result of step A to perform touch detection processing to the capacitive touch sensor. The disclosed methods and systems which are easy to implement and have lower cost can be applied in various digital products with capacitive touch screens, which not only facilitates replacing touch panel modules with different models or supplied by different suppliers, but also can ensure ideal touch detection results.

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Shenzhen, China

Hua Long