G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 23/163 (2006.01) G01R 29/00 (2006.01) G01R 31/00 (2006.01) H04B 3/46 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 2106973
Abstract The invention relates to a method for determining the transmission characteristics (H(jf)) of an electric line (2) in an ISDN system, in which a test signal (m(t)) is applied to the line (2) at one end, and at the other end of the line (2) the received signal (g(t)) produced owing to the test signal (m(t)) is evaluated. In order to be able to carry out such a method using a test signal having a crest factor of one with relatively little cost, use is made as test signal of a binary, bipolar random number sequence signal (m(t)) having the crest factor of one, and during a time inter- val corresponding to the period of the test signal (m(t)) the received signal (g(t)) is scanned and subjected to a Fourier transformation to obtain a spectral signal (G(jf)); the latter is complexly multiplied by a refer- ence spectrum Mi(jf) to obtain an output signal (H(jf) which represents a measure of the transmission character- istics of the line (31). FIG. 1
Arweiler Hans Werner
Wolf Andreas
Kirby Eades Gale Baker
Tektronix Inc.
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