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Performing noise cancellation in radio signal by using spectral duplication

A noise elimination and signal technology, applied in the direction of electrical components, transmission systems, etc., can solve problems such as difficulties

Active Publication Date: 2020-06-26
SKYWORKS SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is so because the electric motors of these vehicles generate interference in the AM band, making it much more difficult to receive an AM broadcast signal in a car radio without unwanted noise

Method used

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  • Performing noise cancellation in radio signal by using spectral duplication
  • Performing noise cancellation in radio signal by using spectral duplication
  • Performing noise cancellation in radio signal by using spectral duplication

Examples

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Embodiment Construction

[0021] In various embodiments, a radio receiver may be provided with noise cancellation circuitry to remove unwanted noise present in a given channel of interest. Embodiments herein are described in the context of an AM signal comprising upper and lower sidebands when in the context of a perfect signal having the same complex conjugate as each other. At a high level, an embodiment may identify undesired noise present in one of a pair of sidebands that ideally includes the same content (albeit out of phase relative to each other). When noise is identified in one of these sidebands, one of a number of signal processing techniques may be performed to remove such noise to allow demodulation and further processing of the noise compensated signal.

[0022] More specifically, embodiments herein may process a windowed set of time-based samples, convert these time-based samples to frequency-based samples, identify noise (in some cases), perform appropriate processing, and convert Freq...

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Abstract

In one embodiment, a noise cancellation circuit includes a window generator to generate a window having a first set of samples; a band splitter to split the window into pairs of symmetric frequency components; a processing circuit, for each of the pairs, to compare a first magnitude of a first symmetric frequency component to a second magnitude of a second symmetric frequency component and modifyone of the components based at least in part on the comparison; an integrator to integrate the pairs outputted from the processing circuit; and a second window generator to generate a second window having a second set of samples.

Description

Background technique [0001] A radio receiver is used to receive and process incoming wireless signals. In many environments, noise challenges exist due to a wide variety of potential sources of interference. Such sources may include interfering radio channels that are closely spaced from the desired radio channel. Other sources may include sources of interference that exist locally with the radio receiver. For example, different electrical components within a single integrated circuit (IC) with a radio receiver or located in close proximity to the IC may operate at frequencies that create noise at one or more frequencies at which the radio receiver operates. [0002] With respect to amplitude modulated (AM) radios, new and increasing sources of interference are found in receivers operating in electric and electric hybrid vehicles. This is so because the electric motors of these vehicles generate interference in the AM band, making it much more difficult to receive AM broadc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/12H04B1/00
CPCH04B1/12H04B1/005H04B1/1036H04B2001/1072H04B1/1027
Inventor C.H.阿勒柳纳斯R.克罗曼T.G.拉根T.沙
Owner SKYWORKS SOLUTIONS INC