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Priority claimed from US07/106,747external-prioritypatent/US4848901A/en
Application filed by Critikon IncfiledCriticalCritikon Inc
Publication of NZ235287ApublicationCriticalpatent/NZ235287A/en
1. An oximeter system, including at least one controllable light source and optical receiver means for producing an electrical signal in response to the reception of light from said source comprising: a source of frequency reference signals; means for producing a modulated waveform; means for coupling said reference signals to said modulated waveform producing means in a direct-current isolated manner; means for energizing said light source in response to said modulated waveform; demodulator means for demodulating components of said electrical signal containing one frequency of said modulated waveform; and means for coupling said electrical signal to said demodulator means in a direct-current isolated manner.
2. The oximeter system of claim 1, further comprising means, responsive to said electrical signal, for separating said components of said electrical signal containing a frequency of said electrical signals.
3. The oximeter of claim 2, wherein said separating means comprises a tuned circuit.
4. The oximeter of claim 2, wherein said electrical signal coupling means comprises a transformer, and said separating means comprises a resonant winding of said transformer. 10MAYI99I*' WEST-YVAt K2n, McCABE 91 • ATTORNEYS FOR IHfc Mrru.oANT
NZ235287A1987-10-081988-10-07Optical oximeter: dc isolation
NZ235287A
(en)
A method and an apparatus for the demodulation of high frequency modulated signals by means of digital filters and digital demodulators, and the application of the method in a remote control receiver