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    • 1. 发明授权
    • Tone detector system
    • 音调检测系统
    • US3763324A
    • 1973-10-02
    • US3763324D
    • 1971-10-01
    • INTEGRATED SYSTEMS TECHNOLOGY
    • GARCIA HPEEK B
    • H04Q1/446H04W88/02H04B7/00
    • H04W88/027H04Q1/4465
    • There is disclosed a tone detector system which is particularly useful in communications systems for detecting audio-frequency signalling tones transmitted from one station to another. The disclosed tone detector system includes an amplifier followed by a limiter. The limiter drives a pair of signal channels each of which includes a tuned amplifier followed by a tone-to-digital converter. The tuned amplifier in each channel is provided with a pair of frequency selective filters, one or the other of which is used depending on the operating mode of the communications equipment. Interlock circuitry cross couples the outputs of the two tone-to-digital converters so that a tone signal indicative digital output signal can appear at the output of only one of the tone signal channels at any given instant.
    • 公开了一种在检测从一个站到另一个站发送的音频信令音的通信系统中特别有用的音调检测器系统。 所公开的色调检测器系统包括放大器,其后面是限幅器。 限幅器驱动一对信号通道,每个信号通道包括调谐放大器,随后是音调到数字转换器。 每个通道中的调谐放大器设置有一对频率选择滤波器,其中一个或另一个根据通信设备的操作模式使用。 联锁电路交叉耦合两个音调数字转换器的输出,使得指示数字输出信号的音调信号可以在任何给定时刻的仅一个音调信号通道的输出处出现。