Communication device and method for using speaker as a stud finder

摘要

A communication device ( 102 ) has a loudspeaker ( 212 ) that includes a loudspeaker coil. The loudspeaker is used for playing audio signals and for detecting metal in the vicinity of the loudspeaker. To detect metal the communication device includes a pulse generation circuit ( 216 ) for generating pulses that are applied to the loudspeaker, and a pulse measurement circuit ( 222 ) for measuring response pulses. If the response pulses indicate metal is in proximity to the loudspeaker, an alert is generated to inform the user of the communication device.