Method of electrically converting an analog signal into a digita

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340347AD, 340347M, 340347NT, 364574, 364575, G21C 1700, H03K 1302

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043080987

ABSTRACT:
A method is described for electrically converting an analog signal into a digital representation in a manner that maximizes noise rejection. The digital representation is formed from a preselected number of discrete points corresponding to sampled approximations of the analog signal. In establishing the magnitudes of the respective points, digital samples of the analog signal are taken at a predetermined number of discrete coordinates along the analog signal on either side of the respective discrete points. The predetermined number of coordinates are averaged and employed as corresponding approximations for the respective discrete points in the digital representative reproduction of the analog signal. The effects of harmonics of power line frequencies associated with processing electrical equipment are minimized by sampling the discrete coordinates for a particular point over an integral number of cycles of the power line frequency. In addition, noise having a high frequency, low duty cycle can be minimized by sampling a relatively large number of discrete coordinates over a period substantially greater than the occurrence of the noise.

REFERENCES:
patent: 3459925 (1969-08-01), Goosey et al.
patent: 3484591 (1969-12-01), Trimble
patent: 3904817 (1975-09-01), Hoffman et al.
patent: 3928127 (1975-12-01), Hiller
patent: 3932211 (1976-01-01), Loving
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, Part I: pp. 36-41, 46-53, 73-75, 87 & 88; Part II: pp. 48-51, 138, 139; Part III: pp. 43, 44, 70, 71, 80-85.
Berkeley et al., Computers--Their Operation and Applications, Rheinhold Publishing Corp., 1956, pp. 27 & 38.
Mitchell et al., Data Averager for Panel Meter, Electronics, 4/1973, p. 103.

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