Method for analyzing and equalizing signals

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison

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324 7638, 360 65, 375230, H03H 1328, H03H 701, G01R 3100, G01R 1328

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active

057899134

ABSTRACT:
Equalizers, used for equalizing distorted signals, are calibrated with the aid of the so-called "eye" pattern on the oscilloscope. Data bits are traced with their edges above one another by triggering to the amplitude so that an "eye" opening is produced. The "eye" is wide open and sharply delimited in the case of correct equalization. However, this method does not provide for automatic calibration of the equalizer. In order to automatically calibrate an equalizer in an optimal manner, a Lissajous figure is formed from in each case of two successive samples of the signal to be equalized. A fuzzy logic control loop compares the Lissajous figures generated with a circle in the case of a sine oscillation and with a square in the case of a square wave oscillation. From this comparison, the fuzzy logic control loop derives the parameters for the equalizer. The equalizer is optimally calibrated when a circle or, respectively, a square is formed as Lissajous figure.

REFERENCES:
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patent: 3864638 (1975-02-01), Audenard et al.
patent: 3868576 (1975-02-01), Bagdasarjanz et al.
patent: 4041254 (1977-08-01), Bradley et al.
patent: 4184827 (1980-01-01), Von Herrmann et al.
patent: 4362973 (1982-12-01), Brentlinger
patent: 4381546 (1983-04-01), Armstrong
patent: 5128609 (1992-07-01), Howley
IBM technical disclosure, IBM corp. NN70111499 IBM technical disclosure Bulletin, Nov. 1970.
IBM Technical Disclosure Bulletin, vol. 13, No. 6, Nov. 1970, Hoffmann C.R., Eye Opening Detector S.1499-1500; 3-10.

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