Mobile device
AssigneeNXP B.V.
InventorChristophe Macours
Life of this patent
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Abstract
Mobile devices such as mobile phones have always-on modes using sensors which respond to changes in the environment. A mobile device is described comprising a loudspeaker; a controller having an input coupled to the loudspeaker. The controller is operable in a first mode of operation to detect an electrical signal generated by the loudspeaker in response to an acoustic input signal. This signal can be used to activate further circuitry. Using a loudspeaker as an acoustic sensor may reduce the power consumption of the mobile device.
Claims15
A method of operation of a mobile device having a first mode of operation and a further mode of operation, the mobile device comprising a loudspeaker, the method comprising:
- In the first mode of operation detecting an electrical signal generated by the loudspeaker in response to an acoustic stimulus,
- generating an activation signal in response to the detected acoustic input,
- enabling the further mode of operation in response to the activation signal.
A mobile device having a first mode of operation and a further mode of operation, the mobile device comprising:
- a loudspeaker;
- a controller having an input coupled to the loudspeaker;
- wherein the controller is operable in a first mode of operation to detect an electrical signal generated by the loudspeaker in response to an acoustic input signal, and to generate a activation signal in response to the detected acoustic input;
- and wherein the mobile device is operable to enable a further mode of operation in response to the activation signal.
Dependencies are inferred from the claim text.