Invention Grant
US09208774B2 Adaptive vibration damping mechanism to eliminate acoustic noise in electronic systems
有权
自适应振动阻尼机制,消除电子系统中的声学噪声
- Patent Title: Adaptive vibration damping mechanism to eliminate acoustic noise in electronic systems
- Patent Title (中): 自适应振动阻尼机制,消除电子系统中的声学噪声
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Application No.: US13861596Application Date: 2013-04-12
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Publication No.: US09208774B2Publication Date: 2015-12-08
- Inventor: David A. Hardell
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Downey Brand LLP
- Main IPC: A61F11/06
- IPC: A61F11/06 ; G10K11/16 ; H03B29/00 ; G10K11/178 ; H04R25/00

Abstract:
A system to eliminate acoustic noise caused by a first Multi-Layer Ceramic Capacitor (MLCC) array positioned on a printed circuit board (PCB) is disclosed. The first MLCC array generates a first vibration responsible for the acoustic noise in response to receiving a varying input voltage. A third MLCC array senses the first vibration and generates a feedback signal. An adaptive filter then uses the feedback signal to generate an output signal that is used by a second MLCC to generate a second vibration that acts as a counter to dampen the first vibration. Because the input voltage signal is varying in time, the adaptive filter continually samples the varying input voltage and the feedback signal to generate the output signal that minimizes the acoustic noise. The second and third MLCC arrays are selectively positioned and oriented on the PCB for optimum performance.
Public/Granted literature
- US20140307889A1 ADAPTIVE VIBRATION DAMPING MECHANISM TO ELIMINATE ACOUSTIC NOISE IN ELECTRONIC SYSTEMS Public/Granted day:2014-10-16
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