Abstract: The present disclosure provides, in one of its aspects, a continuous ECG unit couplable to a medical watch that comprises a first and second ECG sensing surfaces. The continuous ECG unit is configured to couple to a first ECG sensing surface that is formed on a peripheral portion of the watch and maintaining the second ECG sensing surface, that is formed at the bottom of the medical watch, exposed. The continuous ECG unit comprises an extended ECG electrode that is attachable to a portion body of the subject and is electrically coupled to the first ECG sensing surface, thereby extending it. This allows a subject wearing the watch to perform a continuous ECG measurement, such as in a Holter device.

Abstract: Optical microphone, laser-based microphone, and laser microphone having reduced-noise components of low-noise components. A laser microphone comprises a laser-diode associated with a low-noise laser driver TX; and a photo-diode associated with a low-noise photo-diode receiver RX. The low-noise laser driver TX supplies a drive current which is a combination of a Direct Current component having a first bandwidth, and an attenuated version of an Alternating Current component having a second, different, bandwidth. Additionally or alternatively, the low-noise photo-diode receiver RX utilizes hardware-based demodulation of the analog signal, and operates to remove a Direct Current component of its output signal prior to digitization.

Abstract: Optical microphone, laser-based microphone, and laser microphone having reduced-noise components of low-noise components. A laser microphone comprises a laser-diode associated with a low-noise laser driver TX; and a photo-diode associated with a low-noise photo-diode receiver RX. The low-noise laser driver TX supplies a drive current which is a combination of a Direct Current component having a first bandwidth, and an attenuated version of an Alternating Current component having a second, different, bandwidth. Additionally or alternatively, the low-noise photo-diode receiver RX utilizes hardware-based demodulation of the analog signal, and operates to remove a Direct Current component of its output signal prior to digitization.