Method and device for measuring the slope of the envelope delay characteristic of a transmission channel and their application to the automatic equalizer selection technique

Abstract From the Canadian patent

Abstract of the Disclosure A method and device for measuring the slope of the envelope delay characteristic in a transmission channel. The slope is determined from a measurement signal received at the output of the channel. In accordance with the method of the present invention the measurement signal, in the channel has a frequency spectrum that includes three rays at frequencies f0, f1 and f2 which are approximately located in the center and at the edges of the useful passband of the channel respectively. At the output of the channel the three components at frequencies f0 f1 and f2 are extracted from the received measurement signal and the, instantaneous phases ?0, ?1 and ?2 of these three …