公开(公告)号：US20130215949A1

公开(公告)日：2013-08-22

申请号：US13854675

申请日：2013-04-01

Applicant: Applied Micro Circuits Corporation

Inventor： Dariush DABIRI

IPC: H04B3/46

CPC classification number: H04B3/46 ,  H04B17/345

Abstract: One or more processing units are programmed to select from among M tones in a frequency domain representation of a signal, a set of tones including at least a strongest tone (relative to background noise) and a tone adjacent thereto. From among M complex numbers in the frequency domain representation of the signal, a set of complex numbers are identified and denoted as a vector Z, corresponding to the selected set of tones. Vector Z is then multiplied with each of M columns of a matrix G which is predetermined to identify a sub-resolution maxima in Z. The M products that result from the vector multiplication of Z and G are used to determine and store in memory at least one or both of: (A) a flag indicating presence or absence of narrowband interference in the signal; and (B) an estimate of a frequency of the narrowband interference.

Abstract translation: 一个或多个处理单元被编程为在信号的频域表示中从M个音调中选择一组音调，其包括至少最强音（相对于背景噪声）和与其相邻的音调。 在信号的频域表示中的M个复数中，识别一组复数，并将其表示为对应于所选择的一组音调的向量Z。 然后将向量Z乘以预定的矩阵G的每个M列，以标识Z中的子分辨率最大值。由Z和G的矢量相乘产生的M个乘积至少用于确定和存储在存储器中 一个或两个：（A）指示信号中存在或不存在窄带干扰的标志; 和（B）对窄带干扰的频率的估计。

公开(公告)号：US20130272447A1

公开(公告)日：2013-10-17

申请号：US13910779

申请日：2013-06-05

Applicant: Applied Micro Circuits Corporation

Inventor： Dariush DABIRI ,  Maged F. BARSOUM

IPC: H03H21/00

CPC classification number: H03H21/0021 ,  H03H21/0012

Abstract: A circuit and method perform adaptive spectral enhancement at a frequency ω1 (also called “fundamental” frequency) on an input signal y which includes electromagnetic interference (EMI) at an unknown frequency, to generate a fundamental-enhanced signal φ1 (or its complement). The fundamental-enhanced signal φ1 (or complement) is thereafter used in a notching circuit (also called “fundamental notching” circuit) to generate a fundamental-notched signal y-φ1. The fundamental-notched signal y-φ1 is itself enhanced to generate a harmonic-enhanced signal φ2 that is used to notch the fundamental-notched signal y-φ1 again, in one or more additional notching circuits that are connected in series with the fundamental notching circuit. The result (“cascaded-harmonic-notched” signal) is relatively free of EMI noise (fundamental and harmonics), and is used as an error signal for an adaptation circuit that in turn identifies the fundamental frequency ω1. Use of a cascaded-harmonic-notched signal as the error signal improves speed of convergence of adaptation.

Abstract translation: 电路和方法在包括未知频率的电磁干扰（EMI）的输入信号y上以频率ω1（也称为“基本”频率）执行自适应频谱增强，以产生基本增强信号phi1（或其补码） 。 此后，在开槽电路（也称为“基本陷波”电路）中使用基本增强信号phi1（或补码）以产生基本缺陷信号y-phi1。 基本缺陷信号y-phi1本身被增强以产生用于在与基本开槽串联连接的一个或多个额外的开槽电路中再次陷波基波切割信号y-phi1的谐波增强信号phi2 电路。 结果（“级联谐波陷波”信号）相对没有EMI噪声（基波和谐波），并被用作自适应电路的误差信号，自适应电路又识别基频ω1。 使用级联谐波陷波信号作为误差信号提高适应性收敛速度。