04239048 is referenced by 25 patents and cites 15 patents.

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.

Title
Cardiotachometer using autocorrelation techniques
Application Number
6/9823
Publication Number
4239048
Application Date
February 6, 1979
Publication Date
December 16, 1980
Inventor
Robert R Steuer
Salt Lake City
UT, US
Agent
Fleit & Jacobson
Assignee
Multitronics Corporation
UT, US
IPC
A61B 5/02
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