Patent ID: 11918367
Assignee: MEDTRONIC, INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A

Claim 19:
20. The computing device of claim 18, wherein the at least a portion of the cardiac signal comprises an area around the T-wave, and wherein as part of determining whether the at least a portion of the cardiac signal is noisy, the processing circuitry is configured to:
determine a plurality of third differences between a third plurality of samples of the cardiac signal, a first sample of the third plurality of samples being before a mapped T-wave and a last sample of the third plurality of samples being after the mapped T-wave, each of the plurality of third differences being a difference in amplitude of a respective sample of the third plurality of samples and a next sample of the third plurality of samples;
determine a plurality of fourth differences between each of the plurality of third differences and a respective next difference of the plurality of third differences;
determine whether there is a sign change between each of the plurality of third differences and the respective next difference of the plurality of third differences;
for each determined sign change, determine whether a magnitude of a respective corresponding fourth difference value is greater than a positive third predetermined noise threshold or lower than a negative third predetermined noise threshold;
calculate a total number of the corresponding second difference values having the magnitude greater than the positive third predetermined noise threshold or lower than the negative third predetermined noise threshold; and
determine whether the calculated total number is greater than a fourth predetermined noise threshold.