Frequentis has filed a patent for a method and system that eliminates echoes in the reproduction of radio signals transmitted via a radio channel. The method involves receiving the radio signal by multiple base stations, transmitting the audio signals to a control station via an IP network, and conducting a similarity analysis to reproduce the radio signal without echo. GlobalData’s report on Frequentis gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Frequentis, drone swarm control was a key innovation area identified from patents. Frequentis's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Method and system for eliminating echoes in radio signal reproduction
A recently filed patent (Publication Number: US20230199121A1) describes a method for eliminating echo in the reproduction of radio signals transmitted via a radio channel. The method involves receiving the radio signal by multiple base stations and transmitting the audio signals via an Internet protocol (IP) network to a control station for reproduction. The first and second audio signals arrive at the control station at different times or with a time shift and undergo a similarity analysis. If a similarity is established between the two audio signals, the radio signal contained in both signals is reproduced without echo.
The patent claims also include additional features. If a similarity is established between the first and second audio signals, only one of the signals is reproduced. The method further involves calculating a quality value for each audio signal, and only the signal with a higher quality value is reproduced. The first and second audio signals can be reproduced in a superimposed and/or synchronized manner if a similarity is established. The similarity analysis involves calculating a time-dependent cross-correlation between the audio signals, and a similarity is established if a cross-correlation peak occurs with time shifts between 0 ms and 1000 ms. Envelopes of the audio signals are used to calculate the time-dependent cross-correlation.
The patent also describes a system that includes multiple base stations, a control station, and an analysis unit. The analysis unit is programmed to perform the similarity analysis method described in the patent.
In summary, the patent presents a method and system for eliminating echo in the reproduction of radio signals transmitted via a radio channel. By analyzing the similarity between audio signals received by multiple base stations, the method ensures that the radio signal is reproduced without echo. The patent also includes additional features such as reproducing only one audio signal, considering quality values, and reproducing the signals in a synchronized manner. The system described in the patent includes base stations, a control station, and an analysis unit programmed to perform the similarity analysis method.