公开(公告)号：US5442696A

公开(公告)日：1995-08-15

申请号：US816332

申请日：1991-12-31

申请人： Craig R. Lindberg ,  David J. Thomson

发明人： Craig R. Lindberg ,  David J. Thomson

IPC分类号： H04Q1/45 ,  H04L27/30 ,  H04Q1/457 ,  H04M3/00

CPC分类号： H04L27/30 ,  H04Q1/4575

摘要： The present invention provides a method and apparatus for detecting control signal information for an element of a communication system. The control signal information is included in one or more segments of a signal communicated over a communication system channel. The invention provides for the application of a plurality of tapers to a segment of a communicated signal; the transformation of a tapered segment; the determination of a similarity score based on a transform of a tapered segment and a model of a control signal; the identification of control signal information based on a similarity score; and the creation of an indicator signal representative of the identified control signal information to the communication system element. The control signal information may comprise a dual-tone multi-frequency signal. The tapers may comprise a discrete prolate spheroidal sequence. A similarity score may be determined based on a ratio of energy distributions. The numerator of the ratio may comprise an energy distribution based on a control signal model, and the denominator of the ratio may comprise an energy distribution based on a difference between a transformed tapered segment and the control signal model.

摘要翻译： 本发明提供了一种用于检测通信系统的元件的控制信号信息的方法和装置。 控制信号信息被包括在通过通信系统信道传送的信号的一个或多个段中。 本发明提供了将多个锥度应用于所传送的信号的段; 锥形部分的转变; 基于锥形段的变换和控制信号的模型确定相似性得分; 基于相似性得分识别控制信号信息; 以及向所述通信系统元件创建表示所识别的控制信号信息的指示符信号。 控制信号信息可以包括双音多频信号。 锥度可以包括离散的长椭球形序列。 可以基于能量分布的比率来确定相似性得分。 该比率的分子可以包括基于控制信号模型的能量分布，并且该比率的分母可以包括基于变换的锥形段和控制信号模型之间的差的能量分布。