Comparison apparatus, e.g. for use in character recognition

Details Comparison apparatus, e.g. for use in character recognition Comparison apparatus, e.g. for use in character recognition

1977-05-20

1978-10-10

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

3401462, G06K 912

Patent

active

041199464

ABSTRACT:
A succession of signals forming the components of an input vector are compared simultaneously with a plurality of reference vectors as the components of the reference vectors are read out in time parallel fashion from a plurality of registers. The comparisons are effected component by component by a plurality of comparators, one per reference vector. The outputs of the comparators are applied to respective integrators or accumulators. At the completion of the comparisons, that integrator or accumulator which stores an extreme value in a predetermined sense indicates the reference vector with which the input vector matches most closely. The vectors may represent characters or samples of waveforms such as speech waveforms, for example, and the invention may be applied to optical character recognition, speed recognition and so on. The apparatus can be implemented from standard, off-the-shelf solid state circuits and avoids the need for purpose built circuitry, such as fusible resistor matrix read-only memories and, therefore, avoids the additional expense and lack of flexibility of such circuitry.

REFERENCES:
patent: 3187305 (1965-06-01), Chiang
patent: 3576534 (1971-04-01), Steinberger
patent: 3849762 (1974-11-01), Fujimoto et al.
patent: 3878509 (1975-04-01), Kikuchi et al.
patent: 3905018 (1975-09-01), Gray
patent: 4014000 (1977-03-01), Uno et al.

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