Circuitry for characterizing speech for tamper protected recordi

Details Circuitry for characterizing speech for tamper protected recordi Circuitry for characterizing speech for tamper protected recordi

1984-08-10

1987-11-10

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

360 27, G10L 500

Patent

active

047062932

ABSTRACT:
Circuitry usable in a tamper protected recording system for characterizing audio signals at the time of recording including a filter for selecting a portion of the audio signal, a zero crossing detector to detect zero crossings, a threshold detector to determine when the threshold of the detector is satisfied, a first microprocessor 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 for converting the counts and threshold information into data signals that can be recorded with the audio signal.

REFERENCES:
patent: 3546584 (1970-12-01), Scarr
patent: 3548100 (1970-12-01), Loe
patent: 3573612 (1971-04-01), Scarr
patent: 3940565 (1976-02-01), Lindenburg
patent: 4040099 (1977-08-01), Cook
patent: 4086634 (1978-04-01), Cook
patent: 4317141 (1982-02-01), Onishi et al.
patent: 4388495 (1983-06-01), Hitchcock
patent: 4477848 (1984-10-01), McWhirter et al.

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