Gain control for a periodic signal and method regarding same
First Claim
1. A gain control method for providing a gain controlled signal representative of a periodic physiological parameter of a patient, the method comprising the steps of:
- measuring the physiological parameter;
providing a signal characteristic of the periodic physiological parameter, the periodic physiological parameter including a plurality of periodic cycles;
updating gain of the signal, exponentially such that the percentage change between gain steps is substantially constant over gain changes, only once per periodic cycle following detection of a periodic event.
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Abstract
A gain control method for providing a gain controlled signal representative of a periodic physiological parameter of a patient includes providing a signal characteristic of the periodic physiological parameter. The periodic physiological parameter includes a plurality of periodic cycles. Gain of the signal is updated only once per periodic cycle following detection of a periodic event. The updating is performed by monitoring an amplitude of the signal between detection of periodic events and comparing the amplitude to a gain control amplitude threshold. Gain of the signal is updated as a function of the comparison. Further, gain is updated following expiration of a predetermined period of time if a periodic event is not detected within the predetermined period of time. The physiological parameter may be respiratory effort. An apparatus for providing such gain control is also provided.
181 Citations
38 Claims
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1. A gain control method for providing a gain controlled signal representative of a periodic physiological parameter of a patient, the method comprising the steps of:
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measuring the physiological parameter; providing a signal characteristic of the periodic physiological parameter, the periodic physiological parameter including a plurality of periodic cycles; updating gain of the signal, exponentially such that the percentage change between gain steps is substantially constant over gain changes, only once per periodic cycle following detection of a periodic event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A gain control method for providing a gain controlled respiratory effort signal of a patient, the method comprising the steps of:
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providing a signal characteristic of the respiratory effort of a patient, the respiratory effort of a patient including a plurality of respiratory cycles; detecting a periodic event which includes one of inspiration offset and inspiration onset; and updating gain of the signal only once per periodic cycle following detection of a periodic event. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A gain control apparatus for providing a gain controlled signal representative of a periodic physiological parameter of a patient, the physiological parameter including a plurality of periodic cycles, the apparatus comprising:
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means for receiving a signal characteristic of the periodic physiological parameter; means for detecting a periodic event of the signal as a function of at least one predetermined threshold; means for updating gain of the signal, exponentially such that the percentage change between gain steps is substantially constant over gain changes, only once during each periodic cycle following detection of a periodic event. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification