H - Electricity – 03 – K
Patent
H - Electricity
03
K
329/9
H03K 9/06 (2006.01) G11B 5/008 (2006.01) G11B 20/14 (2006.01) H04L 25/49 (2006.01)
Patent
CA 1037570
DEMODULATING CIRCUITRY FOR PULSE RATE MODULATION DATA REPRODUCTION Abstract of the Disclosure Variations in recording and/or scanning velocity in the reproduction of data from a recording of pulse rate modulation (PRM) are accommodated by original logical circuitry resolving the data at each pulse or transition as recorded. The reproducing circuitry is activated at each pulse or transition for measuring the periods between pulses or transitions and comparing successive measurements retrospec- tively. Upon recognizing a fundamental spacing or ratio of spacing of the PRM, for example, 1:1, an electric line is brought to a predetermined level indicative of a clocking pulse or transition. Any other ratio, for example, 2:1 in a common form, is recognized as data of a given nature. At clocking pulse time, another predetermined level is also indicative of data of nature opposite that of the given nature. At this clocking pulse time, component measuring circuitry is alternated and the reference component measuring circuitry is reset for succeeding retrospective comparisons of periods between pulses or transitions. Both analog and digital measuring and comparing circuitry is contemplated with conventional logical circuitry components and also by resolution in connection with a programmed digital computer. -1- ,971058 -1-
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