Respiration data acquisition, conversion and display system
First Claim
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1. A respiration data acquisition, conversion and display system comprising:
- a respiration rate sensor having a resistance varying cyclically with respiration rate;
first means connected to the respiration rate sensor to generate a series of electrical output pulses having a repetition rate related to the cyclic change in the resistance of the respiration rate sensor;
means for generating a train of clock pulses,a counter receiving the clock pulses, and triggered into an "on" state by a first specified number of output pulses of said first means and triggered into an "off" state by a second specified number of subsequent output pulses of said first means and where a total count registered represents the time period of the second specified number of output pulses representing the cyclic changes in the resistance of the respiration rate sensor;
a divider receiving the total count of the counter wherein the numerator of the divider is a scaling constant and the denominator of the divider is the total count of the counter and where the output of the divider represents the average respiration rate in respiration cycles per minute; and
display means connected to said divider for displaying the respiration rate.
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Abstract
Respiration data is measured and converted into a series of electrical output pulses, the frequency of which is related to the respiration rate. The output pulses trigger "on" and "off" a timing device, and the average time of a respiration cycle is then converted into a respiration rate and displayed. The timing device includes a means for delaying a first specified number of output pulses before beginning the sampling period and registering a count of clock pulses which represents the time period of a second specified number of the output pulses occurring subsequently to the first specified number of output pulses.
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Citations
3 Claims
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1. A respiration data acquisition, conversion and display system comprising:
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a respiration rate sensor having a resistance varying cyclically with respiration rate; first means connected to the respiration rate sensor to generate a series of electrical output pulses having a repetition rate related to the cyclic change in the resistance of the respiration rate sensor; means for generating a train of clock pulses, a counter receiving the clock pulses, and triggered into an "on" state by a first specified number of output pulses of said first means and triggered into an "off" state by a second specified number of subsequent output pulses of said first means and where a total count registered represents the time period of the second specified number of output pulses representing the cyclic changes in the resistance of the respiration rate sensor; a divider receiving the total count of the counter wherein the numerator of the divider is a scaling constant and the denominator of the divider is the total count of the counter and where the output of the divider represents the average respiration rate in respiration cycles per minute; and display means connected to said divider for displaying the respiration rate. - View Dependent Claims (2, 3)
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Specification