Abstract: Methods and systems for simultaneous sub-Nyquist measurement of a plurality of bioelectric signals are disclosed. A system includes measurement and reference electrodes configured to measure a first and a second bioelectric signal simultaneously. The first signal is within a first frequency band, the second signal is within a second frequency band, the second band is higher than the first band, and the first and second bands are separated by a frequency gap. The system also includes a filter for attenuating in the frequency gap and a sampler configured to sample, by conducting a sampling at a sampling frequency, the first and second bioelectric signals as measured simultaneously by the measurement and reference electrodes. The sampling frequency is lower than the Nyquist frequency for the second signal. An alias of the second signal caused by the sampling is in the frequency gap. The alias does not overlap the first band.

Abstract: Methods and systems related to the field of gesture detection are disclosed herein. A system for a personal head wearable device includes a first electrode and a second electrode. The first electrode and the second electrode measure a bioelectric signal. The system further includes one or more non-transitory computer readable media storing instructions which, when executed by the system, cause the system to analyze the bioelectric signal to recognize a gesture signal in the bioelectric signal using a stored signature model for the gesture signal, and generate an interface signal upon recognizing the gesture signal in the bioelectric signal. The gesture signal is one of a double jaw clenching signal, a triple jaw clenching signal, and a long jaw clenching signal.

Abstract: Methods and systems related to the field of gesture detection are disclosed herein. A system for a personal head wearable device includes a first electrode and a second electrode. The first electrode and the second electrode measure a bioelectric signal. The system further includes one or more non-transitory computer readable media storing instructions which, when executed by the system, cause the system to analyze the bioelectric signal to recognize a gesture signal in the bioelectric signal using a stored signature model for the gesture signal, and generate an interface signal upon recognizing the gesture signal in the bioelectric signa. The gesture signal is one of a double jaw clenching signal, a triple jaw clenching signal, and a long jaw clenching signal.