公开(公告)号：US20030128836A1

公开(公告)日：2003-07-10

申请号：US10041336

申请日：2002-01-08

Applicant: MOTOROLA, INC.

Inventor： James Allen Stephens ,  Lam Tak Wing

IPC: H04M001/00 ,  H04M009/00

CPC classification number: H04M1/82

Abstract: A signal detector for detecting a signal having a first nominal frequency, F1 and a second nominal frequency F2, the signal intermixed with an interfering signal to form a composite signal, the signal detector including a first and a second band pass filter centered at F1 and F2 for filtering the composite signal to provide an F1 and F2 signal; a parameter estimator for determining an F1 and F2 period for the F1 and F2 signal for a sequence of frames and an average period shift (APS) for a current frame and a plurality of earlier frames; a metric calculator for calculating a metric that corresponds to the F1 and F2 period and the APS; and a decision processor for deciding whether the signal has been detected based in part on a comparison of the metric and a threshold.

Abstract translation: 一种用于检测具有第一标称频率F1和第二标称频率F2的信号的信号检测器，所述信号与干扰信号混合以形成复合信号，所述信号检测器包括以F1为中心的第一和第二带通滤波器， F2用于对复合信号进行滤波以提供F1和F2信号; 用于确定用于帧序列的F1和F2信号的F1和F2周期以及当前帧和多个较早帧的平均周期移位（APS）的参数估计器; 用于计算对应于F1和F2周期和APS的度量的度量计算器; 以及判定处理器，用于基于所述度量和阈值的比较来判定所述信号是否已经被检测到。