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公开(公告)号：US3763322A
公开(公告)日：1973-10-02
申请号：US3763322D
申请日：1971-10-01
IPC分类号： H03M1/82 , H03K3/0231 , H04Q1/50 , H04B7/00
CPC分类号： H03K3/0231 , H04Q1/50
摘要： A relaxation oscillator is formed by a Schmitt trigger circuit and an operational integrator circuit interconnected to form an oscillatory feedback loop. A diode switching network is constructed to receive a plural-bit digital input signal and to modify a circuit parameter in the oscillator feedback loop to adjust the frequency of oscillation in accordance with the coding of the digital input signal. An active low-pass filter circuit is connected to the output of the operational integrator circuit and supplies a sinusoidal tone signal to an output circuit. A switching circuit is responsive to the digital input signal for disabling the output circuit except during the occurrence of predetermined digital code values.
摘要翻译： 松弛振荡器由施密特触发电路和互连的操作积分电路形成振荡反馈回路。 二极管开关网络被构造为接收多位数字输入信号并修改振荡器反馈环路中的电路参数，以根据数字输入信号的编码来调节振荡频率。 有源低通滤波器电路连接到运算积分电路的输出端，并将正弦音信号提供给输出电路。 开关电路响应于数字输入信号，用于禁止输出电路，除了发生预定的数字代码值之外。
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公开(公告)号：US3763324A
公开(公告)日：1973-10-02
申请号：US3763324D
申请日：1971-10-01
CPC分类号： H04W88/027 , H04Q1/4465
摘要： 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.
摘要翻译： 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。
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3.发明授权Temperature compensated signal generation circuit employing a single temperature sensing element 失效采用单温度传感元件的温度补偿信号发生电路
公开(公告)号：US3763440A
公开(公告)日：1973-10-02
申请号：US3763440D
申请日：1972-04-24
CPC分类号： H03L1/022 , H03B5/368 , H03B2200/0048 , H03B2200/0056 , H03B2201/018 , H03B2201/0258
摘要： A signal generation circuit includes a crystal oscillator for generating an oscillatory signal and a temperature compensation circuit coupled to the oscillator for controlling the capacitance loading of the crystal in the oscillator. The temperature compensation circuit includes a temperature sensing device and operates to develop a first capacitance in a first temperature range, a second capacitance which varies at a ertain rate with the variation in temperature in a second temperature range, and a third capacitance which varies at a different rate with the variation in temperature in a third temperature range.
摘要翻译： 信号发生电路包括用于产生振荡信号的晶体振荡器和耦合到振荡器的温度补偿电路，用于控制振荡器中的晶体的电容负载。 温度补偿电路包括温度检测装置，其工作是在第一温度范围内开发第一电容，第二电容随第二温度范围内的温度变化而以不变速率变化，第三电容在 与第三温度范围内的温度变化不同的速率。
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