Patent ID: 8208657

Claim:
A signal processing device comprising: a signal recording unit including an actuator that is driven by a current supplied from a power source and that has a possibility of generating audible noise caused by the driving, the signal recording unit being configured to record the sound signal therein; a sound pickup unit configured to pick up sound including audible noise generated by the signal recording unit and convert the sound into a sound signal; a current detecting unit configured to detect the magnitude of the current supplied to the signal recording unit and a temporal change in the current supplied to the signal recording unit; and a signal processing unit configured to determine, on the basis of at least one of the detected magnitude of the current and the detected temporal change in the current, whether the audible noise has been generated and perform when it is determined that the audible noise has been generated, noise removal processing for removing the audible noise from the sound signal, which contains the audible noise.