Cantilever motion sensor

An apparatus comprising:

• a unidirectional shock sensor including:
• a substrate including a cavity;
• a mass portion over a bottom of the cavity;
• a beam coupled between the mass portion and a side of the cavity;
• and
• a pair of sensing elements at a distal end of the beam away from the mass portion and being part of the beam or on two opposing sides of the beam;
• and
• a processing circuit coupled to the pair of sensing elements and configured to:
• receive first signals from the pair of sensing elements;
• and
• provide a second signal representing a measurement of a motion of the unidirectional shock sensor based on the first signals.

An apparatus comprising

• a voice accelerometer including:
• a substrate including a cavity;
• a mass portion adjacent to the cavity;
• a beam coupled between the mass portion and a side of the cavity;
• and
• a pair of sensing elements on the beam near the mass portion and away from the side of the cavity;
• and
• a processing circuit coupled to the pair of sensing elements and configured to:
• receive a first signal from the pair of sensing elements, the first signal representing a measurement of a motion of the voice accelerometer;
• and
• provide an audio signal based on the first signal.