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US 10,212,006 B2Granted
Feed-forward filtering device and associated method
AssigneeMediatek Inc.
InventorTai-You Lu
Life of this patent
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Abstract
A filtering device includes a low-pass filter (LPF), a noise estimation circuit and a first combining circuit. The LPF receives and filters a pre-filtering signal to generate an output signal of the filtering device. The noise estimation circuit estimates an estimated noise signal according to the output signal and the pre-filtering signal. The first combining circuit subtracts the estimated noise signal from an input signal of the filtering device to generate the pre-filtering signal.
Claims9
A filtering device, comprising:
- a low-pass filter (LPF), arranged to receive and filter a pre-filtering signal to generate an output signal of the filtering device;
- a noise estimation circuit, arranged to generate an estimated noise signal according to the output signal and the pre-filtering signal;
- and
- a first combining circuit, arranged to subtract the estimated noise signal from an input signal of the filtering device to generate the pre-filtering signal;
- wherein the noise estimation circuit comprises:
- a first amplifying circuit, arranged to amplify the output signal by a first gain to generate an amplified output signal;
- a second amplifying circuit, arranged to amplify the pre-filtering signal by a second gain to generate an amplified pre-filtering signal;
- and
- a second combining circuit, arranged to subtract the amplified output signal from the amplified pre-filtering signal to generate the estimated noise signal.
6 more elements
A filtering method, comprising:
- performing a low-pass filtering (LPF) operation upon a pre-filtering signal to generate an output signal;
- estimating an estimated noise signal according to the output signal and the pre-filtering signal;
- and
- subtracting the estimated noise signal from an input signal to generate the pre-filtering signal;
- wherein estimating the estimated noise signal according to the output signal and the pre-filtering signal comprises:
- amplifying the output signal by a first gain to generate an amplified output signal;
- amplifying the pre-filtering signal by a second gain to generate an amplified pre-filtering signal;
- and
- subtracting the amplified output signal from the amplified pre-filtering signal to generate the estimated noise signal.
6 more elements
Dependencies are inferred from the claim text.