Demodulated chrominance signal filter using impedance mismatched sections

Abstract

A filter network suitable for translating a signal such as a demodulated 'I' chrominance component of a composite color television signal is disclosed. The filter network comprises first and second cascaded sections with mutually grossly mismatched terminating impedances, and are passively interconnected via a resistance of a value which substantially precludes interaction between the sections over a given range of frequencies within the passband of the signals being translated. Both sections are separately excited with signals to be translated. The first section provides wideband filtering and a large amount of delay relative to that provided by the second section. The second section provides signal amplitude peaking within a given portion of the frequency passband of the first section.