Method and an apparatus for measuring distant echo delay in...

Details Method and an apparatus for measuring distant echo delay in... Method and an apparatus for measuring distant echo delay in...

H - Electricity

04

B

340/72

H04B 15/00 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1208734

-22- ABSTRACT: A method and an apparatus for measuring distant echo delay in an echo cancelling arrangement. The delay of the distant echo in an echo can- celling arrangement comprising a near echo canceller, a delay line and a distant echo canceller is measured in accordance with a method which comprises the following steps: - transmission, by modulation of a carrier, of a data sequence having a periodic autocorrelation function with sidelobes of negative or zero value, this sequence having a duration at least equal to the maximum value of the delay to be measured and a number of elements determined by the accuracy desired for measurement of the delay; - calculation of the correlation function between the data of a next transmitted sequence and the data formed by demodulating the received signal and storing calcu- lated samples of the correlation function in a memory; - determining, among the samples stored, the sample cor- responding to the maximum of the correlation function and the rank of that sample.

444065

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