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1. 发明授权

US4552992A Analog signal verification circuit 失效
标题翻译：模拟信号验证电路
公开(公告)号：US4552992A
公开(公告)日：1985-11-12
申请号：US560237
申请日：1983-12-12
申请人： Edward Bruckert , David Conroy , Richard Ellison , Martin Minow
发明人： Edward Bruckert , David Conroy , Richard Ellison , Martin Minow
IPC分类号： H04M11/06 , G01R31/28 , H04L27/26 , H04M11/00 , H04L25/02 , G06F15/46
CPC分类号： G01R31/2834 , H04M3/303
摘要： The present system employs a high speed digital signal processor which is programmed to generate pairs of digitized waveforms, each pair representing a pair of different frequencies in response to coded input signals. Each pair of different digitized waveforms, when converted and combined into an analog signal, represents a "tone pair" as used in major telephone systems. The tone pairs are transmitted through an anti-aliasing filter circuit and therefrom through amplification circuitry to a tone pair decoder of the type used in major telephone systems. At the tone pair decoder the tone pair signals are reconverted into binary signals. The binary signals from the tone pair decoder are transmitted to a data processor in the system under test, whereat they may or may not be further decoded. Ultimately the binary signals are compared with the coded input signals originally sent. In this way, the system which is designed to handle digital signals and which is designed to handle digital to analog conversions, is tested. The test circuit employs components already present in the system, or readily adaptable from the major telephone systems equipment.
摘要翻译：本系统采用高速数字信号处理器，其被编程以产生成对的数字化波形，每对对应于编码的输入信号响应于一对不同的频率。当转换并组合成模拟信号时，每对不同的数字化波形表示主要电话系统中使用的“音调对”。音调对通过抗混叠滤波器电路通过放大电路传输到主要电话系统中使用类型的音调对解码器。在音调对解码器中，音调对信号被重新转换成二进制信号。来自音调对解码器的二进制信号被发送到被测系统中的数据处理器，其中它们可以被进一步解码或者不被进一步解码。最终将二进制信号与原始发送的编码输入信号进行比较。以这种方式，被设计为处理数字信号并被设计为处理数模转换的系统被测试。测试电路采用已经存在于系统中的组件，或者容易地适用于主要电话系统设备。

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