H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/27
H03H 11/16 (2006.01) H04B 3/06 (2006.01) H04B 3/14 (2006.01)
Patent
CA 1155188
ABSTRACT OF THE DISCLOSURE The present invention relates to an amplitude equalizer for use in a signal transmission system. Signal transmission systems require amplitude equalization in order to realize desired transmission characteristics. Known equalizers produce more delay distortion the larger the equalizing quantity is. Accordingly, high-speed transmission systems need more delay equalizers than level transmission systems. This invention provides an amplitude equalizer consisting of a first and a second unit of amplitude equalizers disposed in series between a first input terminal and a first output terminal. Each of the first and the second unit is supplied with a branching circuit, a synthesizing circuit, an amplifying or attenuating circuit, a circuit for delay correction and a phase shifting circuit whereby the delay distortion characteristics of the first and second unit are set to their complementary values to flatten the overall delay distortion of the equalizer. Furthermore, the attenuation or amplification factor, the delay time and the phase shift are changeable to achieve variable amplitude and frequency characteristics. The improved equalizer compensates both the amplitude and the own delay distortion of a signal in distinction to conventional equalizers, and is stable, versa- tile and easy to adjust.
325305
Nippon Electric Co. Ltd.
Smart & Biggar
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