Zero-power operable classification device and switching device and voice-operated powerless wake-up switch

Classification device for classifying an input signal which is an aperiodic vibration signal, the classification device comprising a network which is a vibratory network comprising a set of vibratory elements and a set of coupling elements, each of the vibratory elements being coupled to one or more of the other vibratory elements by at least one of the coupling elements;

• and
• a support for supporting the network, at least one of the vibratory elements being coupled to the support, in particular by at least one of the coupling elements;
• wherein the vibratory network has a shape such that the input signal is classified to be a trigger signal or to be a signal other than a trigger signal, wherein
• the input signal is classified to be a trigger signal if, in reaction to coupling the input signal to the classification device, a magnitude related to one of the vibratory elements referred to as triggering element reaches or exceeds a threshold value;
• and
• the input signal is classified to be signal other than a trigger signal if, in reaction to coupling the input signal to the classification device, the magnitude remains smaller than the threshold value;
• wherein the magnitude is
• a displacement of the triggering element relative to a position of rest of the triggering element;
• a velocity of the triggering element;
• or
• an acceleration of the triggering element.