Circuitry for characterizing speech for tamper protected...

Details Circuitry for characterizing speech for tamper protected... Circuitry for characterizing speech for tamper protected...

G - Physics

11

B

352/68

G11B 27/36 (2006.01) G11B 20/00 (2006.01)

Patent

CA 1242275

-1- Circuitry For Characterizing Speech For Tamper Protected Recording Abstract Circuitry usable in a tamper protected recording system for characterizing audio signals at the time of recording including a filter (10) for selecting a portion of the audio signal, a zero crossing detector (14) to detect zero crossings, a threshold detector (16) to determine when the threshold of the detector is satisfied, a first microprocessor (18) for counting the zero crossing detections for successive time intervals and determining for each of the time intervals whether the threshold was satisfied and a second microprocessor (20) for converting the counts and threshold information into data signals that can be recorded with the audio signal.

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