method and arrangement for determining the slope of the characteristic curve of the gruppenlaufzeit in a transmission channel and applied to the automatic selection of a entzerrers

摘要

P method of measurement of the slope of the feature group time of a channel. / p & & p & is sent through the channel a measurement signal whose spectrum comprises three lines with frequencies f, f and f located at the center and to the edges of the passband of the channel. The phases are extracted, the components at the frequencies f, f and f of the measurement signal received. A combination of these phases gives a measurement of the slope. The fixed appropriate equalizer is selected according to the value of this slope. / p & & p & application to transmission systems of pharmaceutical. / p