9 results about "Ultrasonic communication" patented technology

The invention provides an explosion-proof electric appliance overcurrent and temperature rise wireless test system and method based on ultrasonic communication, and relates to the technical field of explosion-proof electric appliance temperature rise tests. The system comprises a temperature acquisition device, an ultrasonic through-wall communication device, an overcurrent protection time acquisition device, a data receiving and storing device and a digital display operation table, wherein the output end of the temperature acquisition device is connected with the input end of the ultrasonic through-wall communication device, the output end of the ultrasonic through-wall communication device is connected with the input end of the data receiving and storing device through wireless communication, and the output end of the overcurrent protection time acquisition device is connected with the input end of the data receiving and storing device; and the data receiving memory is connected with the digital display console through a bidirectional data channel. According to the invention, the anti-interference performance and the test precision of temperature measurement are enhanced, and the multi-node distributed monitoring capability is provided through multi-channel data transmission, so that the overall efficiency of the internal temperature and overcurrent protection monitoring of the explosion-proof electric appliance is greatly improved.

The application discloses a kind of adaptive QAM and OFDM bimodulus intracorporeal ultrasonic communication system and method based on channel estimation, belong to intracorporeal ultrasonic communication technical field, the transmitting end is configured with single carrier QAM modulation mode and multicarrier OFDM modulation mode, real-time evaluation intracorporeal ultrasonic channel quality in receiving end, according to the optimal modulation mode of evaluation result, according to the optimal modulation mode generation mode switching instruction, the mode switching instruction is sent to transmitting end, transmitting end according to the mode switching instruction seamlessly switches between single carrier QAM modulation mode and multicarrier OFDM modulation mode, so that transmitting end works in optimal modulation mode, the system and method can dynamically select optimal modulation mode according to intracorporeal channel real-time quality parameter, while ensuring that mode switching is reliably synchronized.

The application provides an ultrasonic communication decoding method, an encoding method and related devices, wherein the decoding method comprises: framing a received ultrasonic signal, and extracting a frequency spectrum energy feature of each frame; sending the frequency spectrum energy feature of each frame into a packet header detection model for classification; if the classification results of T consecutive frames are all packet headers, it is considered that a data packet starts, otherwise, detection is continued; if it is detected that the data packet starts, an ultrasonic encoding classification model is used to classify subsequent data frames; for each data frame, the output of the ultrasonic encoding classification model is M nodes, corresponding to M ultrasonic frequency bands; and the classification result of a frame with the maximum posterior probability in each ultrasonic encoding bit interval is selected in turn as the decoding result of the encoding bit. Since the packet header detection and bit decoding in the decoding process both adopt a model-based classification method, the anti-interference performance of ultrasonic wave communication can be obviously improved, and the dependence on distance and equipment is reduced.

This invention relates to a communication method and apparatus for an ultrasonic passive tag reader / writer. It employs a single ultrasonic transducer for simultaneous energy and information transmission, adaptively adapts to communication duration, and uses time-division multiplexing to encode the transmitted signal. First, initially, the reader / writer drives the ultrasonic transducer to emit an ultrasonic signal to the passive tag for a specified period. Once the passive tag is fully charged, it responds. The reader / writer records this charging time and uses it as a reference for the next communication step. Second, by designing an encoding method with stronger error correction capabilities, the accuracy is improved. This invention effectively saves communication energy consumption, is applicable to ultrasonic communication at any frequency, enhances its applicability, and improves transmission efficiency and accuracy. It is suitable for ultrasonic passive tag communication using a single ultrasonic transducer, and the method is simple with stable and reliable data transmission.

The invention relates to the technical field of ultrasonic communication, in particular to a design method of an ultrasonic cross-metal communication channel echo cancellation filter, which comprises the following steps of: acquiring a composite signal which is received by a receiving end and comprises a direct signal and an echo signal; creating a corresponding filter mask according to the length of a pre-selected filter; generating a Toeplitz matrix of the composite signal, and according to the filter mask, rejecting a column corresponding to a filter coefficient invalid for echo elimination in the Toeplitz matrix to form a new Toeplitz matrix; constructing a sparse optimization problem of a filter coefficient of the filter; solving the sparse optimization problem to obtain a sparse vector, and recovering the sparse vector into a corresponding filter coefficient according to the filter mask; and the filter is designed according to the filter coefficient obtained through recovery, so that the echo signal in the composite signal is filtered through the designed filter, interference can be avoided, and the filtering performance is improved.

1. The name of the design product: underwater acoustic communication sensor (C01). 2. The use of the design product: used in underwater ultrasonic communication and positioning. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

An ultrasound communication system includes an ultrasound probe, an ultrasound base, and a channel. The ultrasound probe includes a first transmitter, a first interface for the first transmitter, a first receiver, and a second interface for the first receiver. The ultrasound base includes a second transmitter, a third interface for the second transmitter, a second receiver, and a fourth interface for the second receiver. The channel is connected to the first transmitter through the first interface, connected to the first receiver through the second interface, connected to the second transmitter through the third interface, and connected to the second receiver through the fourth interface. The first transmitter is configured to transmit a first signal having a first distinguishable signal characteristic to the second receiver. The first receiver is configured to receive a second signal having a second distinguishable signal characteristic from the second transmitter.

The application discloses a communication method and device based on QAM-OFDM, relates to the technical field of ultrasonic communication, and comprises the following steps: using convolution code on an original signal to obtain an initial signal, using QAM modulation technology on the initial signal to convert the initial signal into a modulated signal, and using OFDM modulation technology to convert the modulated signal into an analog signal; using spread spectrum technology on the analog signal, and using a power amplifier and a band-pass filter to process the analog signal; receiving the analog signal processed by a steel rail channel; using an analog-digital converter to convert the received signal, using OFDM demodulation technology to demodulate the converted signal, and using QAM demodulation technology to restore the original signal from the demodulated signal. The application can enhance the anti-interference capability of the signal while maintaining efficient signal transmission.

The present disclosure broadly provides applications of communication at ultrasound frequencies to establish transcutaneous data communication between medical devices located on and / or within a body of a patient, including inter alia: features for adjustable implants including data communication, hermetic containment, and torque amplification features.