Surgery – Truss – Pad
Patent
1978-11-03
1980-09-02
Kamm, William E.
Surgery
Truss
Pad
128903, A61N 100
Patent
active
042201560
ABSTRACT:
An implantable AM receiver having a variable threshold which can detect signals above a changing noise level. An AM receiver is provided which provides a modulation envelope corresponding to the amplitude of a pulse-modulated RF signal radiated by an external device. A voltage signal is developed which is at least equal to the amplitude of the modulation envelope, but which decays at a predetermined rate if the modulation envelope drops to a value below the voltage signal. The voltage signal is then scaled to a predetermined percentage of a value corresponding to the value of the modulation envelope, and biased so that it cannot drop below a predetermined minimum level. The scaled voltage signal comprises the variable threshold and is compared by a comparator to the modulation envelope. If it is below the modulation envelope, the comparator outputs a voltage having a first state; if it is above the modulation envelope, the comparator outputs a voltage having a second state.
REFERENCES:
patent: 3498288 (1970-03-01), Max et al.
patent: 3520295 (1970-07-01), Kelly
patent: 3796221 (1974-03-01), Hagfors
patent: 3833005 (1974-09-01), Wingrove
patent: 3939824 (1976-02-01), Arneson et al.
Morgan Wayne A.
Schulman Joseph H.
Kamm William E.
Pacesetter Systems Inc.
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