Method and system for eliminating echo in the reproduction of radio signals transmitted via a radio channel
AssigneeFrequentis AG
InventorAndreas Reisenbauer
Life of this patent
Estimating the term…
Abstract
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.
Claims8
A method for eliminating an echo in a reproduction of radio signals transmitted via a radio channel, which comprises the steps of:
- receiving a radio signal, transmitted by a transmitter, 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;
- and
- transmitting the first and second audio signals via an Internet protocol (IP) network to a control station for reproduction, wherein the first audio signal and the second audio signal 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 the first and second audio signals without echo if a similarity is established between the first audio signal and the second audio signal;
- calculating a time-dependent cross-correlation between the first audio signal and the second audio signal in the similarity analysis, envelopes of the first audio signal and the second audio signal being used in each case to calculate the time-dependent-cross-correlation, and establishing the similarity if a cross-correlation peak occurs with time shifts between 0 ms and 1000 ms;
- and
- if the similarity is established between the first audio signal and the second audio signal, removing or reducing the time shifts of the radio signal contained in the audio signals so that the first audio signal and the second audio signal are reproduced in a superimposed and/or synchronized manner.
Dependencies are inferred from the claim text.