Recording biological signals using Hilbert transforms
First Claim
1. An apparatus for monitoring electrical signals propagating through a living organism, the apparatus comprising:
- a bipolar electrode; and
means operatively connected to the electrode for performing a Hilbert transform on a signal from the electrode.
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Abstract
A method and apparatus for monitoring electrical signals propagated through a living organism. A bipolar electrode is placed in contact with the tissue of the organism. Means is operatively connected to the electrode for performing a Hilbert transform on signals from the electrode. The individual electrodes of the bipolar electrode are preferably spaced-apart a distance d so as to satisfy the equation: |πBd/v|<π/2. The Hilbert transform can be implemented by performing a Fourier transform on the signal, multiplying the signal by the imaginary number j, changing the sign of the signal at all negative frequencies, and then performing a reverse Fourier transform on the signal. The resulting signal is then displayed. Preferably brush tip electrodes are used for EMG signals although the method and apparatus is also applicable to needle electrodes.
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Citations
15 Claims
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1. An apparatus for monitoring electrical signals propagating through a living organism, the apparatus comprising:
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a bipolar electrode; and means operatively connected to the electrode for performing a Hilbert transform on a signal from the electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11)
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10. An apparatus as claimed in 9, wherein the individual electrodes are spaced-apart 2.5-4 mm.
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12. A method of evaluating biological signals from a living organism, comprising:
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applying a bipolar electrode to tissue of the organism; processing signals from the electrode using Hilbert transforms; and recording the processed signals. - View Dependent Claims (13, 14, 15)
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Specification