SPREAD-SPECTRUM METHOD FOR DETERMINING PHYSIOLOGICAL PARAMETERS
First Claim
1. An apparatus for determining a physiological parameter of a living being, comprising:
- a receiver adapted to receive iterating optical signals, an optical signal comprising sequences, and a sequence comprising at least two bright periods during which a transmit light source adopts an on state and at least two dark periods during which no transmit light source adopts an on state, and the at least two bright periods being irregularly arranged within a sequence, andan extractor for extracting information on the physiological parameter from the receive signal, the extractor being adapted to receive, to store or to generate binary code words comprising a length and indicating an arrangement of the bright and dark periods, and to link a binary code word with the signals in a block-by-block manner so as to obtain a digital signal of a bright transmit channel, the bright transmit channel being determined by the binary code word, and to link two other binary code words with the signals so as to obtain two digital signals of two dark transmit channels which are determined by the two other binary code words, and the extractor being adapted to extract, on the basis of the digital signal of the bright transmit channel and of the two digital signals of the dark transmit channels, a value of a magnitude indicating the physiological parameter, the extractor being implemented to form a differential signal from the two dark transmit channels, and to reduce an aliasing interference in the digital signal of the bright transmit channel by means of a spectral analysis of the differential signal.
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Accused Products
Abstract
An apparatus including a receiver and an extractor is provided for determining a physiological parameter of a living being. The receiver is adapted to receive iterating optical signals, the optical signal including sequences, and a sequence including at least two bright periods during which a transmit light source adopts an on state and at least one dark period during which no transmit light source adopts an on state, and the at least two bright periods being irregularly arranged within a sequence. In addition, the apparatus includes an extractor. The extractor extracts information on the physiological parameter from a receive signal, the extractor being adapted to extract, on the basis of the information on the arrangement of the bright periods within the sequence, a value of a magnitude indicating a vital parameter.
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Citations
33 Claims
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1. An apparatus for determining a physiological parameter of a living being, comprising:
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a receiver adapted to receive iterating optical signals, an optical signal comprising sequences, and a sequence comprising at least two bright periods during which a transmit light source adopts an on state and at least two dark periods during which no transmit light source adopts an on state, and the at least two bright periods being irregularly arranged within a sequence, and an extractor for extracting information on the physiological parameter from the receive signal, the extractor being adapted to receive, to store or to generate binary code words comprising a length and indicating an arrangement of the bright and dark periods, and to link a binary code word with the signals in a block-by-block manner so as to obtain a digital signal of a bright transmit channel, the bright transmit channel being determined by the binary code word, and to link two other binary code words with the signals so as to obtain two digital signals of two dark transmit channels which are determined by the two other binary code words, and the extractor being adapted to extract, on the basis of the digital signal of the bright transmit channel and of the two digital signals of the dark transmit channels, a value of a magnitude indicating the physiological parameter, the extractor being implemented to form a differential signal from the two dark transmit channels, and to reduce an aliasing interference in the digital signal of the bright transmit channel by means of a spectral analysis of the differential signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of determining a physiological parameter of a living being, comprising:
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receiving iterating optical signals, an optical signal comprising sequences, and a sequence comprising at least two bright periods during which a transmit light source adopts an on state and at least two dark periods during which no transmit light source adopts an on state; and
the at least two bright periods being irregularly arranged within a sequence, andextracting information on the physiological parameter from the receive signal, binary code words which comprise a length and indicate an arrangement of the bright and dark periods being received, stored or generated; linking a binary code word with the signals in a block-by-block manner so as to obtain a digital signal of a bright transmit channel, the bright transmit channel being determined by the binary code word; linking two other binary code words with the signals so as to obtain two digital signals of two dark transmit channels which are determined by the two other binary code words; extracting, on the basis of the digital signal of the bright transmit channel and of the two digital signals of the dark transmit channels, a value of a magnitude indicating the physiological parameter, the extracting comprising forming a differential signal from the two dark channels, and an aliasing interference in the digital signal of the bright transmit channel being reduced by means of a spectral analysis of the differential signal.
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27. An apparatus for generating a light signal for coupling into a body part, comprising:
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a driver for generating a drive signal, the driver being implemented to generate a series of iterating sequences, and wherein a sequence comprises at least two bright periods, wherein the drive signal causes an on state of a light source, and at least two dark periods during which the drive signal causes an off state of the light source, and the at least two bright periods being irregularly arranged within the sequence; at least one light source for generating the light signal on the basis of the drive signal; and a securer for securing the light source to the body part. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A method of generating a light signal for coupling into body parts, comprising:
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generating a drive signal, the drive signal comprising a series of iterating sequences, and a sequence comprising at least two bright periods, wherein the drive signal causes an on state of a light source, and at least two dark periods during which the drive signal causes an off state of the light source, and the at least two bright periods being irregularly arranged within the sequence, and generating the light signal, on the basis of the drive signal, for coupling into a body part.
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Specification