Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1980-06-10
1981-12-01
Gensler, Paul L.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
358905, H04B 304
Patent
active
043038956
ABSTRACT:
An automatic equalizer comprises a transversal filter for receiving an input signal to be equalized and having adjustable tap gains, a circuit connected to receive an output signal of the transversal filter and the input signal to be equalized to produce an equalized output signal, a distortion detect circuit for detecting a distortion component included in the output signal, a tap gain correct circuit connected to receive a distortion detect signal from the distortion detect circuit to produce tap gain correct signals, and a tap gain hold circuit responsive to the tap gain correct signals to correct the tap gains of the transversal filter and hold the corrected tap gains. In order to eliminate the influence of DC offset component at the output of the distortion detect circuit on the signal equalization, a polarity inverting circuit is provided for synchronously and periodically inverting the polarity of a signal component included in the output signal of the distortion detect circuit and the polarity of the tap gain correct signals.
REFERENCES:
patent: 3479458 (1969-11-01), Lord et al.
patent: 4250472 (1981-02-01), Hashimoto
Makino et al., A Fully Automatic Ghost Canceller, IEEE Trans. on Consumer Electronics, Aug. 1978, pp. 267-273.
Arnon, An Adaptive Equalizer for Television Channels, IEEE Trans. on Communication Tech., Dec. 1969, pp. 726-734.
Obara Masaharu
Ohnishi Shunichi
Sakurai Masaru
Yamada Hisashi
Gensler Paul L.
Nippon Hoso Kyokai
Tokyo Shibaura Denki Kabushiki Kaisha
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