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Data-acquisition-system-using-non-linear-digitization-intervals

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Data acquisition system using non-linear digitization intervals

Details

Inventors: Weedon, Hans J.; Dolazza, Enrico;
Assignee: Analogic Corporation (Peabody, MA)
Primary Examiner: Hayes; Gail O.
Assistant Examiner:
Attorney, Agent or Firm: Kusmer; Toby H.

A data acquisition system is described for converting a plurality of analog information signals to a corresponding plurality of digital output signals each (a) having a dynamic range of n bits to match the dynamic range of the corresponding analog information signal, and (b) representative of the corresponding analog information signal during each of a plurality of time intervals. The system simultaneously converts each of the analog signals to an intermediate digital signal during each of the time intervals in accordance with a digitization code of m bits (where m is less than n) such that the digitization intervals of the code increase non-linearly so that the ratio of the noise level of the intermediate digital signal and the digitization interval of the code is substantially constant throughout the dynamic range of the analog signals. The intermediate digital signals are transformed to the corresponding digital output signals.

DETAILED DESCRIPTION Accordingly, it is a general object of the present invention to provide an improved data acquisition system which overcomes or substantially reduces the above-noted problems.
A more specific object of the present invention is to provide an adaptive digitizing data acquisition system which utilizes a minimum number of bits required to properly code the informational content of the signal, while preserving the desired dynamic range for representing image information.
Another, more specific object of the present invention is to provide a data acquisition system for simultaneously and synchronously converting a plurality of analog signals to digital signals during each reading so as to reduce the number of uniformity and design constraints of multiple A/D converter systems in which several A/D converters operate independently.
It is another specific object of the present invention to provide an improved data acquisition system for converting analog signals acquired from either continuous wave or pulsed X-ray sources.
It is yet another specific object of the present invention to provide an improved data acquisition system for converting analog information signals to digital signals each having a dynamic range of the order of 20 bits or more.
And still another specific object of the present invention is to provide an improved A/D converter system, for use in a pulsed X-ray C.
T.
scan system, for simultaneously converting all of the analog signals of the corresponding channels to a digital code so as to provide uniformity of readings substantially insensitive to certain types of artifacts.
And yet another object of the present invention is to provide an improved A/D converter system capable of decreasing certain electronic noise by decreasing the operational frequencies of the system.
And still another object of the present invention is to provide an improved A/D converter system which can easily be adapted for use with both pulse and CW X-ray sources.
And yet another object of the present invention is to provide an improved A/D converter system for use in a C

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