Cardiotachometer using autocorrelation techniques
First Claim
1. A cardiotachometer for indicating heart rate of a user in beats per minute, said cardiotachometer comprising:
- means, responsive to the heart beats of said user for producing a heart rate signal having portions representative of the beats per minute of said user'"'"'s heart;
means for storing the portions of said heart rate signal;
means for comparing each of said stored portions with the most recent portion of said heart rate signal;
means for issuing a display signal when at least two of the comparisons in said comparing means is made between portions within a predetermined comparison range; and
means, responsive to said display signal, for displaying said most recent portion of said heart rate signal in eye-readable format wherein heart rate in beats per minute is indicated.
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Accused Products
Abstract
A cardiotachometer for indicating heart rate of a user in beats per minute. The cardiotachometer comprises a sensor, placed on the body of the user, for producing an electrical signal indicative of the heart rate of the user. Circuitry is provided for converting the electrical signal into first and second digital signals. 60/t computation circuitry responds to the first and second digital signals and produces a third digital signal having a varying frequency representative of the number of heart beats per minute. An up-counter converts the third digital signal into a plurality of binary number signals, each bit of which is stored in a series of shift registers. A compare using a plurality of exclusive OR gates, compares each of the stored binary number signals with the most recent binary number signal, from the up-counter, to determine if a plurality of compared signals are within a predetermined percentage of each other. Finally, a display is provided for displaying the most recent binary number signal, when the plurality of compared signals are within the predetermined percentage of each other. Further provision is made for display of both elapsed time and time of day.
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Citations
24 Claims
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1. A cardiotachometer for indicating heart rate of a user in beats per minute, said cardiotachometer comprising:
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means, responsive to the heart beats of said user for producing a heart rate signal having portions representative of the beats per minute of said user'"'"'s heart; means for storing the portions of said heart rate signal; means for comparing each of said stored portions with the most recent portion of said heart rate signal; means for issuing a display signal when at least two of the comparisons in said comparing means is made between portions within a predetermined comparison range; and means, responsive to said display signal, for displaying said most recent portion of said heart rate signal in eye-readable format wherein heart rate in beats per minute is indicated. - View Dependent Claims (2, 3)
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4. A cardiotachometer for indicating heart rate of a user in beats per minute, said cardiotachometer comprising:
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interval means, responsive to the heart beats of said user, for producing an interval signal having portions indicative of the time interval between said beats; means for converting each portion of said interval signal into a heart rate signal having portions representative of the beats per minute of said user'"'"'s heart; means for storing the portions of said heart rate signal; means for comparing each of said stored portions with the most recent portion of said heart rate signal; means for issuing a display signal when at least two of the comparisons in said comparing means are made between portions within a predetermined percentage of each other; and means, responsive to said display signal, for displaying said most recent one of said plurality of signals in eye-readable format wherein heart rate in beats per minute is indicated. - View Dependent Claims (5, 6, 7, 8)
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9. A cardiotachometer for indicating heart rate in beats per minute of a user, said cardiotachometer comprising:
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sensor means, adapted to contact the skin of said user, for producing an electrical signal inidicative of the heart rate of said user; means for converting said electrical signal into first and second digital signals; means responsive to said first and second digital signals for producing a third digital signal having a varying frequency representative of the number of heart beats per minute; converting means for converting said third digital signal into a plurality binary number signals; storing means for storing each of said binary number signals; means for comparing each of said stored binary number signals with the most recent binary number signal from said converting means to determine if a plurality of compared signals are within a predetermined comparison range of each other; and means for displaying said most recent binary number signal when said plurality of compared signals are within said predetermined percentage of each other. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification