The thermal noise is not contained in the driven reference and not introduced to the reference lead. The signal lead includes a coupling capacitor and a protection resistor associated with thermal noise. A front end circuit includes a signal lead operable to sense cardiac electrical potentials through one of the electrodes, a reference lead operable to sense the cardiac electrical potentials through another electrode, and a reference generator configured to inject a driven reference to the reference lead. Electronic circuitry is provided within the wearable housing and includes a low power microcontroller. Electrodes are provided on a ventral surface of the implantable housing to capture P-wave signals and R-wave signals. A wireless antenna is shaped to wrap around an interior periphery of the implantable housing. An implantable housing includes an external surface. The monitors include a housing, an electrocardiographic front end circuit, a memory, and a micro-controller configured to: obtain a series of electrode voltage values based on the sensed electrocardiographic signals use a plurality of selection schemes to choose one or more of a plurality of compression algorithms associated with each of the selection scheme for testing test the selected compression algorithms including applying the compression algorithms chosen using each of the selection schemes to a segment of the electrode voltage series analyze results of the testing select one or more compression algorithms chosen using one of the selection schemes for compressing at least a portion of the electrode voltage series based on the analysis obtain a compression of at least the portion of the electrode voltage series and store the compression within the memory.Ībstract: A noise-separating cardiac monitor is provided. Abstract: A subcutaneous and cutaneous electrocardiography monitor configured for self-optimizing ECG data compression is provided.
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