Apparatus for discrimination of myoelectric potential patterns
First Claim
1. An apparatus for the discrimination of myoelectric potential patterns obtained by m myoelectric potential signals derived from motions of muscles of a body part and transmitted by a plurality of myoelectrodes fastened to the muscles at a like plurality of positions, the myoelectric potential patterns having n categories each one of which is assigned to a different motion produced by the muscles, the apparatus comprising an input unit for rectifying and smoothing the myoelectricpotential signals transmitted by the myoelectrodes, means for summing said potential signals and for comparing the sum of the transmitted myoelectric potential signals with a preset reference level and, when the sum exceeds the reference level, forwarding the individual myoelectric potential signals through an output of the input unit;
- a processing unit formed of a group of memories having stored therein the weight coefficients determined on the basis of the average myoelectric potential patterns obtained in advance with prescribed modes of motions of the muscles and a processing circuit for performing one by one arithmetic operations on the actual myoelectric potential signals (s) received from the output of said input unit, wherein denotes actual input patterns, and the weight coefficients (a) from the memories in accordance with linear discriminant functions expressed by the following formulas to issue values (y) successively;
##EQU3## wherein n is the number of the categories of the modes of the motions and m is the number of the myoelectric potential signals;
a maximum-value detection unit for latching the signal of the maximum value singled out of the values received from the processing unit and issuing, as output, the signal of the category number corresponding to the maximum-value signal; and
a synchronizing unit for synchronizing the operation of the input unit, processing unit and maximum-value detection unit.
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Abstract
An apparatus for the discrimination of myoelectric potential patterns, which operates with a procedure comprising the steps of discriminantly screening instruction signals from myoelectric potential signals issuing from the subject'"'"'s body, performing arithmetic operations of the linear-discriminant functions on the instruction signals against the gravity coefficients fixed in advance based on the data of average myoelectric potential patterns from the modes of motions involved, and classifying the signal of the largest value selected from the results of said arithmetic operations with respect to the prescribed mode of motion.
74 Citations
7 Claims
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1. An apparatus for the discrimination of myoelectric potential patterns obtained by m myoelectric potential signals derived from motions of muscles of a body part and transmitted by a plurality of myoelectrodes fastened to the muscles at a like plurality of positions, the myoelectric potential patterns having n categories each one of which is assigned to a different motion produced by the muscles, the apparatus comprising an input unit for rectifying and smoothing the myoelectric
potential signals transmitted by the myoelectrodes, means for summing said potential signals and for comparing the sum of the transmitted myoelectric potential signals with a preset reference level and, when the sum exceeds the reference level, forwarding the individual myoelectric potential signals through an output of the input unit; -
a processing unit formed of a group of memories having stored therein the weight coefficients determined on the basis of the average myoelectric potential patterns obtained in advance with prescribed modes of motions of the muscles and a processing circuit for performing one by one arithmetic operations on the actual myoelectric potential signals (s) received from the output of said input unit, wherein denotes actual input patterns, and the weight coefficients (a) from the memories in accordance with linear discriminant functions expressed by the following formulas to issue values (y) successively;
##EQU3## wherein n is the number of the categories of the modes of the motions and m is the number of the myoelectric potential signals;a maximum-value detection unit for latching the signal of the maximum value singled out of the values received from the processing unit and issuing, as output, the signal of the category number corresponding to the maximum-value signal; and a synchronizing unit for synchronizing the operation of the input unit, processing unit and maximum-value detection unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification