Hard disk drive with self-contained active acoustic noise...

Details Hard disk drive with self-contained active acoustic noise... Hard disk drive with self-contained active acoustic noise...

2006-11-21

2006-11-21

Pendleton, Brian T. (Department: 2615)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Particular transducer or enclosure structure

C381S071300

Reexamination Certificate

active

07139401

ABSTRACT:
An active noise reduction system for reducing the acoustic noise generated by a hard disk drive or generated external of a hard disk drive. The active noise reduction system is integrated into the hard disk drive and produces an acoustic waveform that is 180 degrees out-of-phase with the acoustic noise being generated, for example, by the spindle motor and VCM. The acoustic noise is received directly through a microphone or indirectly through the read/write head, spindle motor driver, or VCM driver. The acoustic noise is processed by electronics and the noise canceling waveform is either retrieved from the hard disk drive's memory, disk, or generated by the electronics. The noise canceling waveform is then broadcasted through one or more transducers that are integrated in the hard disk drive.

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TDB Jan. 1989 p. 256-258.

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