Invention Grant
- Patent Title: Noise reduction within an electronic device using automatic frequency modulation
- Patent Title (中): 使用自动频率调制的电子设备内的降噪
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Application No.: US11650045Application Date: 2007-01-03
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Publication No.: US07986193B2Publication Date: 2011-07-26
- Inventor: Christoph Horst Krah
- Applicant: Christoph Horst Krah
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Morrison & Foerster LLP
- Main IPC: G06F3/041
- IPC: G06F3/041 ; G01R23/06

Abstract:
Disclosed is a system and method for providing an oscillating signal of relatively precise frequency without using a signal provided by a crystal as a reference. Disclosed is a feedback oscillator circuit configured to output an oscillating signal having a frequency defined by a reference signal. The oscillating signal can be sent to one or more circuits including at least one frequency sensitive element. The frequency sensitive element produces an output signal which depends on the frequency of the oscillating signal. A controller controls the reference signal in order to cause an attribute of the output signal to have a value within a desired range.
Public/Granted literature
- US20080157893A1 Noise reduction within an electronic device using automatic frequency modulation Public/Granted day:2008-07-03
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