Digital signatures
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Jul 1, 2014
Grant Date -
Jan 5, 2012
app pub date -
Sep 8, 2011
filing date -
Mar 11, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
Digital signature generation apparatus, comprising an envelope generator operable to generate an envelope representation, of only one polarity, of a sampled data segment, and operable for each of successive portions comprising a predetermined plurality of samples to provide a portion sum value as the sum the values of the samples in the portion, thereby to provide said envelope representation; a threshold value generator operable to determine a threshold value for each portion of the envelope representation; an event detector operable to detect, as an event, a transition of a portion sum value across the threshold value for the portion concerned; and a signature generator operable in response a detected event to generate a digital signature characteristic of the sampled data segment.
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