Variable threshold for rate volume monitor

Details Variable threshold for rate volume monitor Variable threshold for rate volume monitor

1987-07-27

1988-11-29

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307290, 307354, 307359, 307573, H03K 5153, H03K 524, H03K 1730

Patent

active

047884568

ABSTRACT:
A variable threshold circuit is provided for use with a rate volume monitor. A series analog switch is controlled by a comparator which is biased by a voltage divider. During low rate exhalation by a patient the bias keeps the analog switch biased against conduction, and noise is suppressed. When exhalation is at a high rate a resistor is switched by a second analog switch into parallel with one of the resistors of the voltage divider to change the bias to the comparator, and thus to render the first analog switch conductive. At this time the high level of the exhilation signal masks any noise.

REFERENCES:
patent: 4358738 (1982-11-01), Kahn
patent: 4634902 (1987-01-01), Tanaka et al.
P. R. Epley et al., "Schmitt Trigger Circuit" IBM Technical Disclosure Bulletin, vol. 16, No. 5, Oct. 1973, pp. 1600-1601.

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