Abstract: An adaptive processing of the pulsatility signal can improve the pulse wave analysis (PWA) leading to a better blood pressure estimation. The technique is based on transforming the pulsatility signal so that the fiducial points required for the PWA are well-defined.

Abstract: A biomedical sensing module and system employs light steering and sensor spatial diversity to enhance the quality and reliability of its measurements. This is particularly relevant to earbuds. Indeed, unlike in a smartwatch, an earbud-based biomedical sensing system suffers from person-to-person physiological differences at the level of the ear canal. This makes it very complicated to engineer a biomedical platform fitting everybody's differences in ear anatomy.

Abstract: A sensor employs an adaptive light-to-digital conversion (LDC) system for high background signal applications. The system adapts the LDC resolution and the power consumption depending on the signal to background ratio. This scheme is of particular interest to photoplethysmography (PPG). The system can have a set of light-to-digital converters in which each of the light-to-digital converters includes an array of pixels and an analog to digital converter for digitizing the output from the array of pixels. Switches are then used to connect each of the light-to-digital converters to a power supply to selectively activate each of the light-to-digital converters.

Abstract: A cyclic analog to digital converter for digitizing an output from a photoplethysmography sensor has a buffer amplifier for setting a voltage of the feedback capacitance. Additionally, digital averaging circuit is preferably provided for averaging the digital output from the cyclic analog to digital converter for the several conversions. Finally, voting logic is additionally provided for declaring the digital bits based on successive comparisons by the one or more comparators.