36results about How to "Accurate signal reception" patented technology

When a transmission device transmits a broadcast service signal using a radio signal, the transmission device determines whether there is a moving body that is moving at high speed toward or away from the transmission device, and calculates the amount of Doppler shift of a radio frequency due to high speed movement based on the movement speed of the moving body when there is such a high-speed moving body. Moreover, the transmission device shifts the frequency of the radio signal for transmitting the broadcast service signal by the Doppler shift amount in the opposite direction of Doppler shift direction. By doing so, it is possible for a moving terminal to receive the broadcast service signal from the original radio frequency regardless of Doppler shifting.

Methods and systems are described for sampling a data signal using a data sampler operating in a data signal processing path having a decision threshold associated with a decision feedback equalization (DFE) correction factor, measuring an eye opening of the data signal by adjusting a decision threshold of a spare sampler operating outside of the data signal processing path to determine a center-of-eye value for the decision threshold of the spare sampler, initializing the decision threshold of the spare sampler based on the center-of-eye value and the DFE correction factor, generating respective sets of phase-error signals for the spare sampler and the data sampler responsive to a detection of a predetermined data pattern, and updating the decision threshold of the data sampler based on an accumulation of differences in phase-error signals of the respective sets of phase-error signals.

The present invention provides an ADS-B airborne anti-interference receiving and processing method. The method comprises the following steps: judging whether a signal has a superposition situation or not after ADS-B airborne equipment receives the signal; if not, sequentially implementing dynamic threshold setting and shaping preprocessing on the signal to obtain a processed signal; implementing preamble pulse detection on the signal, calculating a reference power level of the signal after the detection is qualified, and then verifying the signal according to the reference power level; and then implementing data bit extraction and confidence calculation processing on the signal after verification, and outputting data bit contents and data location confidence of the signal. According to the ADS-B airborne anti-interference receiving and processing method provided by the invention, full and comprehensive verification processing solutions can be provided for various existing situations of space signals; interference, superposition and other problems of the space signals can be effectively solved; and the accuracy of the received signals can be ensured.

The invention discloses a low earth orbit satellite communication dynamic time delay and Doppler simulation method, which calculates dynamic transmission time delay and dynamic Doppler frequency offset according to a real-time communication distance between a low earth orbit satellite and a ground terminal, and designs a corresponding dynamic time delay simulation system according to a low earth orbit satellite signal transmission model. A sending signal of a satellite end can be simulated to obtain a ground receiving signal in a real-time dynamic time delay scene after passing through the dynamic time delay simulation system. According to the dynamic time delay simulation system, the dynamic time delay filter does not need to calculate the filter coefficient in real time, the filter coefficient can be updated only by inputting the real-time time delay through the Farrow structure, and compared with other schemes, the dynamic time delay simulation system is simple in structure, low inimplementation complexity and accurate in simulation result. Meanwhile, up-sampling and down-sampling processing is adopted to enable a satellite sending signal frequency band to be in a working frequency band with good amplitude-frequency response of a time delay filter, and errors of a time delay simulation system are further reduced.

The invention relates to a ventilating method and a ventilating device for a building and is characterized in that a wind speed monitoring mechanism is arranged at the highest roof of a building and a position above the highest roof, the wind speed monitoring mechanism is electrically connected with an electric window and an automatic control system of the building, and the automatic control system of the building is used for controlling the wind speed monitoring mechanism and the electric window, so as to realize linkage of the wind speed monitoring mechanism and the electric window; by monitoring the change conditions of natural wind and adapting to the change of the natural wind, the resistance distribution of a resistance part on a ventilating path of the building can be changed; and a control signal produced by the control system is output to a control end of the electric outer window to form a regulation structure for leading the natural wind into the room of the building, so as to change the resistance distribution of the resistance part on the ventilating path of the building. The method and the device have the benefits of being convenient to control, simple in structure and capable of ensuring reasonable indoor natural ventilation.

A synchronous control apparatus for reception control in wireless packet communication suppresses detection errors during controlling synchronization to detect codes for improved signal reception. An initial synchronizer includes a code correlator for receiving delayed waves on plural paths. The code correlator outputs a correlation level value through another correlator. The correlation level value is compared with a threshold value from a threshold value register, with the result inputted into an address counter. The correlation level value is also inputted into a correlation level hold circuit. The hold circuit sums the correlation level values obtained in the correlator for a portion of the paths corresponding to a count in the address counter. The hold circuit compares the summed correlation level values with another threshold value from another threshold value register, and uses the result as a basis to set a top timing for receiving delayed waves.

A light emitting device and a display device using the light emitting device as a light source and including a panel assembly. The panel assembly has a gate lines for transferring gate signals, data lines for transferring data signals, and pixels at crossing regions of the gate lines and the data lines. The light emitting device provides a light source to the panel assembly. The light emitting device has a plurality of light emission pixels, and each light emission pixel corresponds to at least one of the pixels of the panel assembly. The display device has a brightness controller coupled to both the light emitting device and the panel assembly. The brightness controller generates and serializes light emission information signals for determining light emission levels of the light emission pixels and transmits the light emission information signals by differential signaling to the light emitting device.

A communication system in which a reception signal can be accurately obtained from a signal transmitted over two-wire type transmission lines without any significant reduction in the communication speed. The communication system utilizing two-wire type transmission lines for transmitting transmission signals in opposite phases has a plurality of nodes connected to the two-wire type transmission lines, and each of the nodes incorporates terminating resistors acting upon the two-wire type transmission lines. A node which includes a reception circuit for receiving a transmission signal has an AC coupling circuit for extracting AC components in a transmission signal input through the transmission lines, a bias circuit for applying a bias voltage to a signal output from the AC coupling circuit and a clip circuit for clipping the level of a signal output from the bias circuit, which are provided at each of the two-wire type transmission lines.

The invention discloses a cloud-based cerebral infarction rehabilitation training device, which primarily comprises a supporting rack, a leg training device, a hand training device, a brain wave collecting device, a control device and a power supply device. The brain wave collecting device is used for receiving brain waves of a patient during training, and is then connected to an intelligent cloudplatform through the control device, and access terminals are arranged on a hospital computer. The device stores the collected brain wave signals of the patient in rehabilitation training through theintelligent cloud platform, and the access terminals are arranged on the hospital computer, medical worker terminals and family member terminals to achieve information interaction of rehabilitation training condition by the family members of the patient and medical workers, so that the rehabilitation training of the post-discharge cerebral infarction patient can be more effective, and the devicehas an extremely good treatment effect for long-term treatment.

The invention discloses a fall detection positioning method and device based on an attitude angle. The device comprises wearing bands which are respectively nested on a wrist and an ankle, attitude angle acquisition modules are fixed over the wearing belts; the number of the attitude angle acquisition modules is four. The attitude angle acquisition modules and a master control acquisition module are in wireless signal transmission; the master control acquisition module and a wireless signal receiving module carry out remote wireless signal transmission. The wireless signal receiving module iselectrically connected with a mobile phone receiving terminal; the master control acquisition module is composed of a two-half plastic shell. A clamping groove is formed in the rear portion of the plastic shell. The clamping groove is embedded in a belt, the falling track of the human body is accurately reproduced, misjudgment is avoided, multi-stage judgment is adopted, it is further guaranteed that misjudgment is avoided, a buzzer and an alarm lamp are controlled to be started in time when the human body falls down, passersby can help the falling human in time conveniently, family members ofthe falling one are remotely informed of the falling address, and the life safety is confirmed.

The invention discloses a three-dimensional stress sensor based on a circularly polarized liquid metal antenna. The sensor comprises a box body, a shell and a circularly polarized antenna structure body; six surfaces of the box body are symmetrically provided with orifices, the inner side of the surface where each orifice is located is fixedly provided with the shell, the circularly polarized antenna structure body is installed in an inner cavity of the shell, the upper top surface of the circularly polarized antenna structure body clings to an upper cover, the upper cover slidably covers theupper opening of the shell, and the upper cover extends out of the box body; the circularly polarized antenna structure body is a compressible organic polymer body, an annular micro-channel is formedin the organic polymer body, the annular micro-channel is filled with liquid metal serving as an antenna, two ports of the liquid metal antenna are correspondingly connected with two feeder lines, andthe feeder lines are led out from the side wall of the organic polymer body. The invention can remotely monitor the three-dimensional stress change in the rock-soil body in real time, and has the advantages of accurate signal receiving, high stability, small size and the like.

A circuit applied to a display apparatus includes a front-end circuit, a conversion circuit and an impulsive interference detection circuit. The front-end circuit converts an analog input signal into a digital input signal. The conversion circuit, coupled to the front-end circuit, converts the digital input signal from a time domain to a frequency domain to generate a frequency-domain signal. The impulsive interference detection circuit, coupled to the conversion circuit, detects a noise intensity of the frequency-domain signal to generate a detection result, which is used to determine whether the analog input signal has impulsive interference.