Scaling physiological signals

An electronic device comprising:

• a physiological sensor;
• and
• one or more processing circuits coupled to the physiological sensor, the one or more processing circuits configured to:
• measure a first physiological signal using a physiological sensor corresponding to one or more electrodes during a first time interval;
• measure a second physiological signal using the physiological sensor corresponding to the one or more electrodes during a second time interval;
• while measuring the first physiological signal and the second physiological signal using the one or more electrodes:
• determine an amplitude range characteristic of the first physiological signal including determining a dynamic range of the first physiological signal at the first time interval;
• in accordance with a determination that the amplitude range characteristic of the first physiological signal meets one or more criteria:
• determine a scaling factor for scaling a height of the second physiological signal relative to a predetermined amount of a display height of a display that is viewable by a user of an electronic device and for preserving information associated with the second physiological signal, wherein the scaling factor varies as a nonlinear function of the dynamic range and corresponds to the second physiological signal during the second time interval;
• and
• scale the second physiological signal based on the determined scaling factor in real time without normalizing the dynamic range;
• and
• in accordance with a determination that the amplitude range characteristic of the first physiological signal does not meet the one or more criteria, forgoing determining the scaling factor and scaling the second physiological signal;
• and
• displaying the scaled second physiological signal or the second physiological signal on the display.

A non-transitory computer readable storage medium storing instructions, which when executed by a device comprising a physiological sensor and one or more processing circuits, cause the one or more processing circuits to perform a method, the method comprising:

• measuring a first physiological signal using a physiological sensor corresponding to one or more electrodes during a first time interval;
• measuring a second physiological signal using the physiological sensor corresponding to the one or more electrodes during a second time interval;
• while measuring the first physiological signal and the second physiological signal using the one or more electrodes:
• determining an amplitude range characteristic of the first physiological signal including determining a dynamic range of the first physiological signal at the first time interval;
• in accordance with a determination that the amplitude range characteristic of the first physiological signal meets one or more criteria:
• determining a scaling factor for scaling a height of the second physiological signal relative to a predetermined amount of a display height of a display that is viewable by a user of an electronic device and for preserving information associated with the second physiological signal, wherein the scaling factor varies as a nonlinear function of the dynamic range and corresponds to the second physiological signal during the second time interval;
• and
• scaling the second physiological signal based on the determined scaling factor in real time without normalizing the dynamic range;
• and
• in accordance with a determination that the amplitude range characteristic of the first physiological signal does not meet the one or more criteria, forgoing determining the scaling factor and scaling the second physiological signal;
• and
• displaying the scaled second physiological signal or the second physiological signal on the display.