Various systems and methods for patient monitoring are provided. A monitor may include a sensor interface configured to obtain a signal from a sensor applied to a patient. The monitor may also include data processing circuitry configured to obtain a heart rate of the patient, select a filter based at least in part on the heart rate, and filter the signal using the selected filter to reduce noise at frequencies other than the heart rate. Additionally, the monitor may include a light source drive circuitry configured to reduce power to a light source of the sensor after the selected filter is applied to the signal.
