Analog signal logarithmic envelope detector

Details Analog signal logarithmic envelope detector Analog signal logarithmic envelope detector

1989-09-12

1991-06-25

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Detecting analog signal peak

341138, 328149, H03M 162

Patent

active

050271180

ABSTRACT:
Disclosed is an analog signal envelope detector, namely a detector that gives a signal representing the slow, overall variations but not the instantaneous variations of the level of an analog signal applied to its input. The detector according to the invention uses a logarithmic compression analog-digital coder of the type used in cofidec circuits for telephone sets. A counter gives the envelope signal sought. A comparator compares the content of the counter and the output of the coder. Depending on the orientation of the comparison, it increments or decrements the counter. The incrementation is made at a frequency which is much faster than the decrementation. The result of this is that the content of the counter represents the envelope of the slow variations of the input signal.

REFERENCES:
patent: 3292150 (1966-12-01), Wood
patent: 3600565 (1971-08-01), Forbes
patent: 4001604 (1977-01-01), Parks et al.
patent: 4769613 (1988-09-01), Sawata et al.
Electronic Design, vol. 33, No. 1, Jan. 1985, "1985 Technology Forecast", pp. 200-218.
Elektor Electronics. vol. 14, No. 158, p. 10, "3.75 Digit DPM", National Semiconductor.

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