Inventors:
- Mountain View CA, US
Lawrence Frederick Heyl - Mountain View CA, US
Dietrich Ho - Mountain View CA, US
Morakinyo John Aina - Mountain View CA, US
Ian C. Smith - Mountain View CA, US
William Saperstein - Mountain View CA, US
Bhaskar Vadathavoor - Cupertino CA, US
International Classification:
G08B 3/10
H04R 17/00
Abstract:
Systems for ensuring an audible alarm circuit sounds at a minimum magnitude of loudness are provided. Different circuitry embodiments discussed herein are each capable of assisting the audible alarm circuit in maintaining a minimum loudness threshold. Audible alarm circuit operation optimization can be achieved using embodiments that fall within anyone of four general categories: compensation networks, direct drive, dynamic tuning, and microphone feedback based dynamic tuning. Use of such circuitry can increase production yields by compensating for manufacturing variations of alarm components and aging characteristics of the components.