Using related signals to reduce ECG noise

A method of creating a noise-reduced result from an ECG signal, comprising:

• obtaining multiple input signals that include one or more ECG input signals and one or more secondary input signals that represent noise;
• dividing the one or more ECG input signals into sets of one or more points, wherein each set of points is synchronized to a beat of the ECG input signal;
• dividing the one or more secondary input signals into sets of one or more points, wherein each set of points of the secondary input signal is synchronized with a corresponding set of points of the ECG input signal;
• measuring a relationship between noise content of corresponding points from successive sets of points for the ECG input signal and the secondary input signal;
• and
• combining the input signals in consideration of the measured relationship to produce a result having low noise content.

A method of creating a noise-reduced result, comprising:

• measuring two or more primary input signals, each primary input signal representing activity of a patient's heart;
• defining a desired result as a combination of the primary input signals;
• measuring a secondary input signal that includes information about noise content in the desired result;
• combining two or more of the primary input signals and the secondary input signal to produce a result that approximates the desired result and has reduced noise relative to the desired result.

A method of creating a noise-reduced result, comprising:

• measuring input signals that include primary input signals, each primary input signal representing activity of a patient's heart;
• defining a desired result as a combination of one or more of the primary input signals;
• measuring a relationship between noise content of the primary input signals;
• and
• combining the primary input signals in view of the measured relationship to produce a result that has reduced noise relative to the desired result.

A method of creating a low-noise result, comprising:

• measuring one or more primary input signals that represent an ECG signal;
• measuring one or more secondary input signals that represent noise in the ECG signal;
• identifying one or more beats of the ECG signal;
• determining parameters of the primary input signals and the secondary input signals for each identified beat of the ECG signal;
• producing, based on the determined parameters, a noise metric that represents noise content in the low-noise result;
• and
• combining the input signals in consideration of the noise metric to produce a result having low noise content.

A method of creating a noise-reduced result, comprising:

• measuring input signals that include a primary input signal representing activity of a patient's heart and a secondary input signal that represents physical activity by the patient;
• determining a relationship between noise content of the primary input signal and noise content of the secondary input signal;
• and
• combining the primary input signal and the secondary input signal in consideration of the determined relationship to produce a noise-reduced result.