FM-Digital converter

Details FM-Digital converter FM-Digital converter

1981-02-25

1983-10-18

Kamm, William E.

Surgery

Truss

Pad

A61B 504

Patent

active

044099843

ABSTRACT:
A square pulse wave is frequency modulated (FM) by an input analog voltage that represents a physiological parameter such as an electrocardiograph waveform. A binary counter is initiated for counting a predetermined integral number, such as four, FM periods for each FM wave sampling interval. A counter/timer counts high rate clock pulses during the interval and stops when the predetermined number of FM periods is counted, thereby producing a count that is proportional to the time per FM period or cycle. The reciprocal of time is calculated to produce a digital number that is proportional to frequency and, hence, to the instant amplitude of the analog input voltage. The number constitutes address to a look-up table storing digital words that correspond in value to dc voltages.

REFERENCES:
patent: 2405597 (1946-08-01), Miller
patent: 3499124 (1970-03-01), Wortzman
patent: 3617885 (1971-11-01), Wheable
patent: 3909599 (1975-09-01), Trott, Jr. et al.
patent: 4027146 (1977-05-01), Gilmore
patent: 4039806 (1977-08-01), Fredriksson et al.
patent: 4281664 (1981-08-01), Duggan

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