CARDIAC SIGNAL PROCESSING APPARATUS AND CARDIAC SIGNAL PROCESSING METHOD
First Claim
1. A cardiac signal processing apparatus comprising:
- a cardiac signal acquisition unit configured to acquire cardiac signals relating to heartbeats of a subject;
a low-pass filter configured to allow passage of those cardiac signals having a first predetermined frequency or lower, among the cardiac signals;
a higher harmonic noise acquisition unit configured to acquire harmonic signals of low-frequency noise by performing high frequency extrapolation on the signals output from the low-pass filter unit;
a high-pass filter configured to allow passage of those cardiac signals having a second predetermined frequency or higher, among the cardiac signals; and
a higher harmonic noise removal unit configured to remove the harmonic signals of low-frequency noise from the signals output from the high-pass filter.
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Abstract
A cardiac signal processing apparatus includes: a unit for acquiring, from a heartbeat sensor, cardiac signals relating to heartbeats of a subject; a low-pass filter for allowing passage of those cardiac signals having a first predetermined frequency or lower, among the cardiac signals; higher harmonic noise acquisition unit for acquiring harmonic signals of low-frequency noise by performing high frequency extrapolation on the signals output from the low-pass filter; a high-pass filter for allowing passage of those cardiac signals having a second predetermined frequency or higher, among the cardiac signals; and higher harmonic noise removal unit for removing the harmonic signals of low-frequency noise from the signals output from the high-pass filter. It is thus made possible to remove noise from the cardiac signals and to obtain desirable heartbeat detection characteristics.
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Citations
7 Claims
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1. A cardiac signal processing apparatus comprising:
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a cardiac signal acquisition unit configured to acquire cardiac signals relating to heartbeats of a subject; a low-pass filter configured to allow passage of those cardiac signals having a first predetermined frequency or lower, among the cardiac signals; a higher harmonic noise acquisition unit configured to acquire harmonic signals of low-frequency noise by performing high frequency extrapolation on the signals output from the low-pass filter unit; a high-pass filter configured to allow passage of those cardiac signals having a second predetermined frequency or higher, among the cardiac signals; and a higher harmonic noise removal unit configured to remove the harmonic signals of low-frequency noise from the signals output from the high-pass filter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A cardiac signal processing method comprising:
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a cardiac signal acquisition step of acquiring cardiac signals relating to heartbeats of a subject; a low-pass filtering step of allowing passage of those cardiac signals having a first predetermined frequency or lower, among the cardiac signals; a higher harmonic noise acquisition step of acquiring harmonic signals of low-frequency noise by performing high frequency extrapolation on the signals output in the low-pass filtering step; a high-pass filtering step of allowing passage of those cardiac signals having a second predetermined frequency or higher, among the cardiac signals; and a higher harmonic noise removal step of removing the harmonic signals of low-frequency noise from the signals output in the high-pass filtering step.
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Specification