| US 7,489,092 B1 | ||
| Method and apparatus for enhanced alert notification | ||
| Steven P. Larky, Del Mar, Calif. (US); and Darrin Vallis, Austin, Tex. (US) | ||
| Assigned to Cypress Semiconductor Corporation, San Jose, Calif. (US) | ||
| Filed on Sep. 28, 2006, as Appl. No. 11/540,524. | ||
| Claims priority of provisional application 60/722626, filed on Sep. 29, 2005. | ||
| Int. Cl. H02P 5/00 (2006.01) | ||
| U.S. Cl. 318—34 [318/66; 318/69] | 20 Claims |
| 1. A system comprising:
a first fan;
a fan controller coupled to said first fan and operable to control said first fan;
a first interface coupled to said fan controller for receipt of alert signals; and
wherein said fan controller is further operable to vary a speed differential between said first fan and a second fan, wherein
said speed differential is operable to create an audible sound, and wherein a variation in said speed differential is used
to change a frequency of said audible sound in response to a received alert signal.
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