Invention Application
- Patent Title: DEVICE WITH PRECISION FREQUENCY STABILIZED AUDIBLE ALARM CIRCUIT
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Application No.: US15727059Application Date: 2017-10-06
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Publication No.: US20180033258A1Publication Date: 2018-02-01
- Inventor: Daniel Adam Warren , Lawrence Frederick Heyl , Dietrich Ho , Morakinyo John Aina , Ian C. Smith , William Saperstein , Bhaskar Vadathavoor
- Applicant: Google Inc.
- Main IPC: G08B3/10
- IPC: G08B3/10 ; H04R17/00

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.
Public/Granted literature
- US10121333B2 Device with precision frequency stabilized audible alarm circuit Public/Granted day:2018-11-06
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