Method and hand-held apparatus for demodulating and viewing frequency modulated biomedical signals
First Claim
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1. A hand-held computer device for patient monitoring, comprising:
- a palmtop digital computer that includes microphone means for receiving a frequency modulated audio signal indicating a selected, continuously variable biomedical parameter of a patient'"'"'s physical condition;
analog to digital converter means changing the frequency modulated audio signal to a digital signal;
means for band-pass filtering said digital signal to produce a filtered digital signal having a low frequency pass-band;
a digital polyphase demodulator receiving said digital signal for transformation to a de-modulated digital signal; and
means for displaying the filtered digital signal for a selected time interval.
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Abstract
Method and apparatus for transmission of biomedical waveform data from a patient to an attending physician wherein the waveform data audio signal is frequency modulated for subsequent wireline or wireless transmission to a remote hand-held computer that functions to digitize, record and demodulate the frequency modulated signal for display on the computer, for permanent print-out, or for further retransmission.
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Citations
14 Claims
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1. A hand-held computer device for patient monitoring, comprising:
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a palmtop digital computer that includes microphone means for receiving a frequency modulated audio signal indicating a selected, continuously variable biomedical parameter of a patient'"'"'s physical condition; analog to digital converter means changing the frequency modulated audio signal to a digital signal; means for band-pass filtering said digital signal to produce a filtered digital signal having a low frequency pass-band; a digital polyphase demodulator receiving said digital signal for transformation to a de-modulated digital signal; and means for displaying the filtered digital signal for a selected time interval. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A personal cardiac monitoring system, comprising:
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a palmtop computer having a microphone providing input to an analog to digital converter; said palmtop computer also having a digital to analog converter, a speaker and a display screen connected for visual and audible signal output, respectively, from a central processing unit with associated memory containing resident software, and further comprising; means detecting and audibly reproducing a patient'"'"'s ECG segment for a predetermined time interval as frequency modulated audio for input to said computer microphone; and a digital polyphase demodulator controlling the demodulation of digital signals from the analog to digital converter for output to said display screen. - View Dependent Claims (8, 9)
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10. A hand-held computer device for patient monitoring, comprising:
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means for receiving a frequency modulated audio signal indicating a selected biomedical parameter of a patient'"'"'s physical condition; means for digitizing and A-Law compressing said audio signal to provide an A-Law digital output; A-Law decoder means receiving and expanding said A-Law digital output; a band-pass filter receiving said expanded digital output to produce a filtered digital output; a frequency estimator means receiving said filtered digital output; and means for displaying said filtered digital output. - View Dependent Claims (11, 12)
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13. A method for monitoring a patient'"'"'s ECG signal, comprising:
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developing a frequency modulated audio ECG signal from the patient; inputting the frequency modulated audio ECG signal via telephone to a programmed palmtop digital computer at a medical diagnostics site; converting said frequency modulated audio ECG signal to a digital frequency modulated ECG signal; demodulating said digital frequency modulated ECG signal to produce a digital ECG signal; and displaying said digital ECG signal as a time analog indication.
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14. A method for using a hand-held palmtop computer for monitoring a patient'"'"'s ECG signals, comprising:
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developing a frequency modulated audio ECG signal from the patient; inputting the frequency modulated audio ECG signal via telephone to a palmtop, programmed digital computer at a medical diagnostics site; companding said frequency modulated audio ECG signal by transforming with an A-Law encoder and decoder to produce an A-Law digital signal counterpart; filtering said digital signal counterpart with a selected bandpass; and deriving a frequency estimate of the digital signal counterpart for display of the ECG signals.
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Specification