Digitally controlled amplitude regulating device for electrocardiographic signals
First Claim
1. A signal processing device comprising:
- a signal input for receiving an electrocardiographic signal containing a succession of QRS complexes;
a signal output;
digitally operating means having a transmission factor which is variable in discrete steps and connected between said signal input and output for supplying to said signal output a signal containing representations of the QRS complexes contained in the signal received by said signal input, with the relation between the amplitude of the signal at said signal output and the amplitude of the corresponding portions of the signal received by said signal input being proportional to the existing transmission factor of said digitally operating means; and
transmission factor control means including threshold detector means having associated selected first, second and third threshold values and connected to monitor the signal at said signal output for increasing the transmission factor of said digitally operating means by one step in response to each appearance at said signal output of a QRS complex representation having a peak value between the selected first and second threshold values and for reducing the transmission factor by one step in response to each appearance at said signal output of a QRS complex representation having a peak value greater than the selected third threshold value, said second threshold value being higher than said first threshold value, said third threshold value being higher than said second threshold value, and said first threshold value being higher than the amplitude of the signal at said signal output during intervals between QRS complexes in the electrocardiographic signal.
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Abstract
A signal processing device composed of: a signal input for receiving an electrocardiographic signal containing a succession of QRS complexes; a signal output; a digitally operating unit having a transmission factor which is variable in discrete steps and connected between the signal input and output for supplying to the signal output a signal containing representations of the QRS complexes contained in the signal received by the signal input, with the relation between the amplitude of the signal at the signal output and the amplitude of the corresponding portions of the signal received by the signal input being proportional to the existing transmission factor of the digitally operating unit; and a transmission factor control unit connected to monitor the signal at the signal output for increasing the transmission factor of the digitally operating unit by one step in response to each appearance at the signal output of a QRS complex representation having a peak value between selected first and second threshold values and for reducing the transmission factor by one step in response to each appearance at the signal output of a QRS complex representation having a peak value greater than a selected third threshold value higher than each of the first and second threshold values.
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Citations
12 Claims
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1. A signal processing device comprising:
- a signal input for receiving an electrocardiographic signal containing a succession of QRS complexes;
a signal output;
digitally operating means having a transmission factor which is variable in discrete steps and connected between said signal input and output for supplying to said signal output a signal containing representations of the QRS complexes contained in the signal received by said signal input, with the relation between the amplitude of the signal at said signal output and the amplitude of the corresponding portions of the signal received by said signal input being proportional to the existing transmission factor of said digitally operating means; and
transmission factor control means including threshold detector means having associated selected first, second and third threshold values and connected to monitor the signal at said signal output for increasing the transmission factor of said digitally operating means by one step in response to each appearance at said signal output of a QRS complex representation having a peak value between the selected first and second threshold values and for reducing the transmission factor by one step in response to each appearance at said signal output of a QRS complex representation having a peak value greater than the selected third threshold value, said second threshold value being higher than said first threshold value, said third threshold value being higher than said second threshold value, and said first threshold value being higher than the amplitude of the signal at said signal output during intervals between QRS complexes in the electrocardiographic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a signal input for receiving an electrocardiographic signal containing a succession of QRS complexes;
Specification