Electronic device having a blower with noise control

Details Electronic device having a blower with noise control Electronic device having a blower with noise control

2011-04-12

2011-04-12

Kramer, Devon C (Department: 3746)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Acoustic, nonairborne vibration sensing or counterwave emission

C381S071900, C415S119000, C417S018000

Reexamination Certificate

active

07925028

ABSTRACT:
An electronic device having a first motor which rotates a rotating body (for example, blades) about a rotation axis and a second motor which vibrates a vibrator including the rotating body in the axial direction is provided. A control IC unit has a first circuit which subjects the rotation to control drive by a first waveform, and a second circuit which subjects the vibration to control drive by a second waveform. Rotation and vibration of a rotating and vibrating unit driven by the first and second motors generates an airflow and output sound by a synthesized output of a first output corresponding to the rotation and a second output corresponding to the vibration. The control IC unit generates a second waveform by using a reversed-phase waveform with respect to the first waveform or the like and suppresses the output sound by control of the first and second waveforms.

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