Mobile device

摘要

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.

主权项

1. 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, wherein the loudspeaker is configured to generate an electrical signal in response to an acoustic stimulus received from a non-stationary sound source; the method comprising: in the first mode of operation
detecting the electrical signal generated by the loudspeaker in response to the acoustic stimulus,generating an activation signal in response to the detected electrical signal,enabling the further mode of operation in response to the activation signal.