Apparatus for filtering cardiac signals
First Claim
1. A filtering device, having an input and an output, associated to a means for collecting physiological data signals, the filtering device input receiving signals (S1) issued from said means for collecting physiological data signals, and the filtering device output delivering signals (S3) to a means for processing physiological data signals, the delivered signals (S3) spreading, in the frequency domain, over a spectral band between a low cut-off frequency (fo) and a high cut-off frequency, wherein the improvement comprises the collection means comprising a first high-pass filter (12) having a first frequency characteristic (24) and a first cut-off frequency (f1);
- and a stage of compensation (20) comprising a means of accentuation having a second frequency characteristic (32) that is inverted as compared to the first frequency characteristic of the first high-pass filter, wherein the first cut-off (f1) frequency of the first high-pass filter is greater than the low cut-off frequency (fo) of the spectral band.
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Accused Products
Abstract
A device for filtering cardiac activity signals which receives input signals coming from collected physiological data, and delivers at an output, for processing data, signals spreading, in the frequency domain, over a widened spectral band. A first high-pass filter is used to reduce the extension of the spectral band of the signal received at the input. A compensation stage having a frequency characteristic (32) that is inverted as compared to that of the first high-pass filter is provided. The cut-off frequency (f1) of the first high-pass filter is greater than the low cut-off frequency (fo) of the spectral analysis band. Optionally, a second high-pass filter is provided, whose characteristic (38) presents a cut-off frequency corresponding to the low frequency (fo) of the spectral band. The high frequency of the spectral band may be similarly modified.
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Citations
13 Claims
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1. A filtering device, having an input and an output, associated to a means for collecting physiological data signals, the filtering device input receiving signals (S1) issued from said means for collecting physiological data signals, and the filtering device output delivering signals (S3) to a means for processing physiological data signals, the delivered signals (S3) spreading, in the frequency domain, over a spectral band between a low cut-off frequency (fo) and a high cut-off frequency, wherein the improvement comprises the collection means comprising a first high-pass filter (12) having a first frequency characteristic (24) and a first cut-off frequency (f1);
- and a stage of compensation (20) comprising a means of accentuation having a second frequency characteristic (32) that is inverted as compared to the first frequency characteristic of the first high-pass filter, wherein the first cut-off (f1) frequency of the first high-pass filter is greater than the low cut-off frequency (fo) of the spectral band.
- View Dependent Claims (2, 3, 4, 5, 6, 11, 12, 13)
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7. A filtering device having an input an output, associated to a means for collecting physiological data signals, the filtering device input receiving signals from said means for collecting physiological data signals, and the filtering device output delivering signals (S1) to a means for processing physiological data signals, the delivered signals spreading, in the frequency domain, over a spectral band between a low cut-off frequency and a high cut-off frequency, wherein the improvement comprises the means for collection further comprising a first low-pass filter having a first frequency characteristic (24'"'"') and a first cut-off frequency;
- and a stage of compensation comprising a means of accentuation having a second frequency characteristic (32'"'"') inverted as compared to the first frequency characteristic of the first low-pass filter, wherein the first cut-off frequency of the first low-pass filter is less than the high cut-off frequency (f3) of the spectral band.
- View Dependent Claims (8, 9, 10)
Specification