6results about "Echo effect reduction" patented technology

The disclosure relates to a method and device for detecting at least one target, comprising: transmitting a sensing signal; obtaining a first channel estimation result corresponding to an echo signal of the sensing signal; obtaining a second channel estimation result based on the first channel estimation result; based on the first channel estimation result and the second channel estimation result, performing over-threshold detection based on a threshold value being used to obtain an index subset related to target(s); and obtaining an over-threshold detection result based on the index subset related to the target(s).

This invention belongs to the field of ultrasonic wireless communication technology through metal media, specifically a Resonant Linear Echo Cancellation (RLS) system based on an FPGA parallel architecture. The system includes a communication transmitter, a metal channel, and a communication receiver. The transmitter includes a digital modulation module, a DAC conversion circuit, a bandpass filter circuit, a signal amplification circuit, a voltage follower circuit, and an ultrasonic transducer. The receiver includes an ultrasonic transducer, a front-end signal conditioning circuit, an ADC conversion circuit, and an FPGA digital signal processing unit. The data to be transmitted is converted into ultrasonic waves by the transmitter and enters the metal channel. After propagation, it enters the receiver, where the FPGA digital signal processing unit performs echo cancellation and demodulation to recover the data. This system utilizes the parallel computing advantages of the FPGA to implement the RLS algorithm in hardware, achieving stable and reliable ultrasonic communication through a metal wall in a sealed metal cavity environment.

An electronic device is provided. The electronic device may comprise a microphone, a speaker, a communication circuit, and at least one processor. The at least one processor can be configured to: acquire a second signal on the basis of decoding a first signal received from an external electronic device through the communication circuit; output an acquired third signal through the speaker on the basis of decompressing the second signal; compensate the second signal on the basis of the difference, between the second signal and the third signal, indicating distortion of the third signal, in response to acquiring, through the microphone, an input signal including the output third signal; and cancel an echo of the input signal on the basis of the compensated second signal.

Techniques for echo cancellation in an RFID reader include incorporating an auxiliary error power amplifier (auxiliary PA) into the RFID reader, and dynamically adjusting a bias setting of the auxiliary PA based on a power level of a reflection of a signal transmitted by the RFID reader (“echo signal”) as measured at the RFID reader. When the measured echo signal power level is high, techniques herein set the auxiliary PA bias setting to a higher level to allow the auxiliary PA to account for the stronger echo signal. Inversely, when the measured echo signal power is low, techniques herein set the auxiliary PA bias setting to a lower level to reduce power consumption while the enabling the RFID reader to cancel echo phenomena and reliably detect signal responses from RFID tags in an environment.

A method and system eliminate echoes in the reproduction of radio signals transmitted via a radio channel. A radio signal transmitted by a transmitter is received by at least a first base station as a first audio signal and by at least a second base station as a second audio signal. The received audio signals are transmitted via an IP network to a control station for reproduction. The first and second audio signals arrive in the control station at different times or with a time shift and undergo a similarity analysis before their reproduction in the control station in order to reproduce the radio signal contained in both audio signals without echo if a similarity is established between the first audio signal and the second audio signal.

The utility model provides a quick release type antenna signal transmission module. The quick-release antenna signal transmission module comprises a first antenna signal transmission structure and a second antenna signal transmission structure. The first antenna signal transmission structure comprises a first quick-release structure matching shell and a first quick-release signal transmission assembly which is partially wrapped by the first quick-release structure matching shell. The second antenna signal transmission structure comprises a second quick-release structure matching shell and a second quick-release signal transmission assembly which is partially wrapped by the second quick-release structure matching shell. Therefore, when the first quick-release structure matching shell is configured to be fixed on a shell of an electronic product, the second quick-release structure matching shell is configured to be detachably connected to the first quick-release structure matching shell, and the second quick-release signal transmission assembly is configured to be detachably connected to the first quick-release signal transmission assembly.