| 摘要 |
The present invention in one aspect is a breathing detection device with a signal source and receiver. A card between the source and receiver alternates between a first state of signal reception and a second state of signal interference, on card movement. A cord moves the card in one direction on pulling, and in reverse on retraction. The card can be a disc, belt, or any configuration conforming to a principle of card movement to effect a difference in signal receiving state. Another aspect the invention is an asynchronous breathing detection method providing a first and a second detection device as described, both in communication. In various configurations one or more processors is provided to receive and process data to determine magnitude and direction of cord and card movement.
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