Abstract: In some embodiments, an audio amplifier can include an input for receiving a signal to be amplified, and an amplification stage configured to amplify the signal based on pulse width modulation and provide the amplified signal at an output node. The audio amplifier can further include a feedback circuit implemented between the output node and the input node. The feedback circuit can include a series arrangement of a high bandwidth input common mode loop and a low bandwidth output common mode loop, with the low bandwidth output common mode loop configured to provide a desired phase change for the high bandwidth input common mode loop.

Abstract: Disclosed is a system for estimating arterial blood pressure. The system includes a heartbeat detection module configured to receive an electrocardiogram signal, and detect one or more QRS complexes of the electrocardiogram signal. The system also includes a photoplethysmographic sensor module configured to trigger a light emitter, thereby generating a plurality of samples of a photoplethysmographic signal. Further, the system includes a blood pressure calculation module configured to receive information about the detected one or more QRS complexes and the plurality of photoplethysmographic signal samples, and calculate at least one blood pressure value based on a pulse arrival time period between the electrocardiogram and the photoplethysmographic signal.

Abstract: Example embodiments relate to systems and methods for heart rate detection with motion artifact reduction. One embodiment includes an electronic system for heart rate detection. The electronic system includes a random sampling sensor module. The random sampling sensor module includes a first sensor circuit configured to provide nonuniform random samples below a Nyquist rate of a photoplethysmographic signal. The random sample sensor module also includes a second sensor circuit configured to provided nonuniform random samples below a Nyquist rate of a motion signal. The motion signal and the photoplethysmographic signals are sampled with an equivalent pattern. The electronic system also includes a heart rate detection module. The heart rate detection module is configured to calculate a heart rave value based on frequencies corresponding to peak powers of calculated power spectral density value sets corresponding to the photoplethysmographic signals in a frequency range of interest.

Abstract: A system for compressed sensing comprising: a compressive sampling module configured for providing a CS-sampled signal and a signal reconstruction module configured for receiving and allocating a first plurality of measurement windows comprising a number of samples from the CS-sampled signal, calculating a corresponding first plurality of reconstruction windows based on the first plurality of measurement windows and calculating a first version of a reconstructed signal based on the first plurality of reconstruction windows.

Abstract: Disclosed is a system for estimating arterial blood pressure. The system includes a heartbeat detection module configured to receive an electrocardiogram signal, and detect one or more QRS complexes of the electrocardiogram signal. The system also includes a photoplethysmographic sensor module configured to trigger a light emitter, thereby generating a plurality of samples of a photoplethysmographic signal. Further, the system includes a blood pressure calculation module configured to receive information about the detected one or more QRS complexes and the plurality of photoplethysmographic signal samples, and calculate at least one blood pressure value based on a pulse arrival time period between the electrocardiogram and the photoplethysmographic signal.

Abstract: Example embodiments relate to systems and methods for heart rate detection with motion artifact reduction. One embodiment includes an electronic system for heart rate detection. The electronic system includes a random sampling sensor module. The random sampling sensor module includes a first sensor circuit configured to provide nonuniform random samples below a Nyquist rate of a photoplethysmographic signal. The random sample sensor module also includes a second sensor circuit configured to provided nonuniform random samples below a Nyquist rate of a motion signal. The motion signal and the photoplethysmographic signals are sampled with an equivalent pattern. The electronic system also includes a heart rate detection module. The heart rate detection module is configured to calculate a heart rave value based on frequencies corresponding to peak powers of calculated power spectral density value sets corresponding to the photoplethysmographic signals in a frequency range of interest.

Abstract: A system for heart rate detection includes a random sampling module configured to provide nonuniform random samples below a Nyquist rate of a biosignal that contains heart rate information; and a heart rate detection module configured to receive a plurality of the nonuniform random samples during a predetermined time window, calculate a power spectral density based on a Lomb-Scargle periodogram of the window samples and calculate a heart rate value based on a frequency corresponding to a highest power peak of the calculated power spectral density. The disclosure also relates to a corresponding method for heart rate detection and a non-transitory computer readable medium.

Abstract: A system for compressed sensing comprising: a compressive sampling module configured for providing a CS-sampled signal and a signal reconstruction module configured for receiving and allocating a first plurality of measurement windows comprising a number of samples from the CS-sampled signal, calculating a corresponding first plurality of reconstruction windows based on the first plurality of measurement windows and calculating a first version of a reconstructed signal based on the first plurality of reconstruction windows.