A Transversal Equalizer for Television Circuits

The restriction that linear distortion imposes on the tion deals with the deviations of particular communicaflow of information has been well known for some time.tion channels from the average of the ensemble to which Consequently, means have been developed for reducthey belong. ing this distortion through the insertion of compensating linear devices. In the past this reduction has Linear distortion been achieved through the use of conventional lumpedIt seems inherent in nature that signals are dispersedparameter networks, quite static by nature. The use that is, spread out and changed-in transmission. This of the transversal filter, however, provides a more dispersion manifests itself in two ways: in radio communidynamic and flexible approach. This device is well cation it is called multipath and in wire communication suited to automatic and even adaptive operation, it is called linear distortion.* and thus it can meet the demands of a channel with Figure 2 depicts a multipath situation. The transit time-varying distortion. time from the transmitter to the receiver varies with the path length so that two signals displaced from each A tremendous effort is being made to obtain greater other in time are received although only one was transand greater transmission efficiencies from already crowded mitted.1 This situation is certain to cause difficulties communications channels. Recent advances in the area of when an effort is made to maximize the information signal design have permitted marked increases in the speed transmission rate in the channel. Multipath transmission of information transmission. In addition, developments can be viewed as communication through a group of in error control systems permit encoded information parallel, distortion-free channels of different lengths. to be sent much more reliably. A remaining obstacle to Another type of communication, typified by the wire efficient information transmission has been the residual communication channel, may have a single obvious transdisersion, or linear distortion, in communication chan-*It is quite possible that each of the several paths comprising nels, and intensive efforts to solve this problem have been multipath transmission itself contains dispersive distortion.

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Recent Developments and Utilizations of Test Signals in the Vertica Interval

Johannesen

1967

IEEE Trans. on Broadcast.

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A Transversal Equalizer for Television Circuits

Cited by 5 publications

References 6 publications

Gain equalizer approximation by using q-Bessel polynomials

Gain equalizer approximation by using q-Bessel polynomials

Automatic equalization using transversal filters

Recent Developments and Utilizations of Test Signals in the Vertica Interval

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