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Adaptive microphonics noise cancellation

An adaptive weighting and filter technology, applied in the field of communication

Pending Publication Date: 2021-08-13
VIASAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical acceleration, such as vibration or shock, can cause frequency modulation at the oscillator, causing microphonic phase noise sidebands in the signal
Piezoelectric crystals can be particularly susceptible to this effect, and mechanical vibrations can instantaneously alter the resonant frequency of the crystal and introduce significant phase noise sidebands through inadvertent frequency modulation

Method used

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  • Adaptive microphonics noise cancellation
  • Adaptive microphonics noise cancellation
  • Adaptive microphonics noise cancellation

Examples

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Embodiment Construction

[0015] Various examples of the systems and methods described herein provide a noise cancellation system that can be used to generate a tuning control signal that modulates a reference oscillator to eliminate or minimize the mechanical acceleration caused by the reference oscillator caused noise. To this end, the acceleration at this location is measured and provided to an adaptive filter comprising an associated set of weights to generate a tuning control signal. The weights may be adapted at periodic intervals according to the measured phase error (or frequency error) of the oscillator output signal of the reference oscillator using an external signal provided to the system to account for variations in the response of the reference oscillator to acceleration. Thus, a lower cost non-seismic reference oscillator can be used without significantly increasing microphonic noise or increasing the cost and weight of the mechanical isolation structure. In addition, small variations b...

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Abstract

Systems and methods are provided for compensating for mechanical acceleration at a reference oscillator. A reference oscillator provides an oscillator output signal and an accelerometer on a same platform as the reference oscillator, such that mechanical acceleration at the reference oscillator is detected at the accelerometer to produce a measured acceleration. A filter assembly, having an associated set of filter weights, receives the measured acceleration from the accelerometer and provides a tuning control signal responsive to the measured acceleration to a frequency reference associated with the system. An adaptive weighting component receives the oscillator output signal of the reference oscillator and an external signal that is provided from a source external to the platform and adjusts the set of filter weights for the filter assembly based on a comparison of the external signal and the oscillator output signal.

Description

[0001] related application [0002] This patent application claims priority to U.S. Patent Application Serial No. 16 / 223777, filed December 18, 2018, which is incorporated herein in its entirety. technical field [0003] This disclosure relates generally to the field of communications, and more specifically, to adaptive howling noise cancellation. Background technique [0004] Microphony or howling effect describes the phenomenon in which certain components in an electronic device convert mechanical vibrations into undesired electrical signals. Mechanical acceleration, such as vibration or shock, can cause frequency modulation at the oscillator, causing microphonic phase noise sidebands in the signal. Piezoelectric crystals can be particularly susceptible to this effect, and mechanical vibrations can instantaneously alter the resonant frequency of the crystal and introduce significant phase noise sidebands through inadvertent frequency modulation. This error can be propaga...

Claims

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Application Information

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IPC IPC(8): H03L1/00H03L7/099
CPCH03L1/00H03L7/099H03B5/02H03B5/30G01S19/23G01S19/26G01S19/21
Inventor B·A·彼得罗维奇M·K·塔萨尼斯
Owner VIASAT INC
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