An Investigation into the Problem of Character Generator Ringing or Second Image on Cable Systems (1977)

By Alex B. Best, Scientific-Atlanta, Inc.

Waveform testing is performed on a CATV Modulator-Home Receiver modem to investigate the problem of "ringing" or "2nd Images" which sometimes occur when video signals having non-standard baseband formats such as alpha-numerics are carried on the cable system.

Past attempts to solve the problem through the use of Data Filters is discussed as well as a different approach utilizing the technique of Time Domain Correction. A block diagram of the Time Domain Correction scheme is given along with a discussion of its operation.

This new technique is applied to the Modulator-Home Receiver modem and waveform testing is once again performed indicating the degree of improvement that might be achieved using this scheme.

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