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Detection of a class of input-signal pulse-sequences is accomplished by comparison of the signal as sampled and digitally coded twice per pulse-width with a similarly sampled reference signal also digitally coded, but having an arbitrary complementary digital pair in pulse positions whose informatio

Detection of a class of input-signal pulse-sequences is accomplished by comparison of the signal as sampled and digitally coded twice per pulse-width with a similarly sampled reference signal also digitally coded, but having an arbitrary complementary digital pair in pulse positions whose information content is of no concern.

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A method for detecting, from among an input-sequence of information-values, a class of input information-value sequences comprising the steps of: first, creating a reference information-sequence comprising a series of reference-values, each said reference value being contained in either a significan

A method for detecting, from among an input-sequence of information-values, a class of input information-value sequences comprising the steps of: first, creating a reference information-sequence comprising a series of reference-values, each said reference value being contained in either a significant sequence-position or a non-significant sequence-position, and having a desired information content in each of said significant sequence-positions, and an arbitrary information content in each of said non-significant sequence-positions; second, coding said reference information-sequence with a pair of identical binary ones for each sequence-position if said desired information content is greater than a predetermined threshold, a pair of binary zeroes for each sequence position if said desired information content is less than a predetermined threshold, and coding said arbitrary information content with a pair of complementary binary values for each sequence position, thereby forming a coded reference-sequence corresponding to said reference information sequence; third, coding each said input information-value with a pair of binary ones for each sequence position if said information-value is greater than a predetermined threshold, a pair of binary zeroes for each sequence position if said information-value is less than a predetermined threshold, thereby forming a coded input-sequence corresponding to said input information-value sequence; fourth, comparing binary values of said coded input-sequence with correspondingly spaced binary values of said coded reference-sequence; fifth, summing the number Of said comparisons in which said compared binary values are of the same value, whereby said summed number is indicative of the occurrence, in said input-signal sequence, of said desired class of sequences; and sixth, supplying a cancelling signal equal in value to the bias value resulting from the comparisons of coded signals in non-significant sequence positions and subtracting the cancelling from the summed signal.