Patent ID: 8265741

Claim:
A heart monitor comprising: an electric signal acquisition and processing stage; two implantable electrodes configured to pick up myocardial electric signals; said electric signal acquisition and processing stage connected or being connectable to the two implantable electrodes; said electric signal acquisition and processing stage comprising a first channel and a second channel that are utilized as signal processing channels; said first channel comprising a first sampling stage configured to sample picked-up myocardial electric signals at a first sampling rate, said first channel configured to process the picked-up myocardial electric signals and generate an electrogram signal; said second channel comprising a high frequency sampling stage configured to sample at least portions of said picked-up myocardial electric signals at a second sampling rate to detect noise, wherein said second sampling rate is higher than said first sampling rate and wherein said sample picked-up myocardial electric signals at said first sampling rate and said sample at least portions of said picked-up myocardial electric signals at said second sampling rate occur in parallel to effectively sample each of said picked-up myocardial electric signals at a plurality of different time intervals; a differential stage configured to generate a high frequency sampled output signal that represents a difference between two consecutive high frequency sampled myocardial electric signal values; and, a comparator that is configured to compare said high frequency sampled output signal with a threshold and to generate a noise detection indicator whenever said threshold is exceeded.