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1. 发明授权

US3942121A Digital tuning method and system 失效
标题翻译：数字调谐方法和系统
公开(公告)号：US3942121A
公开(公告)日：1976-03-02
申请号：US504642
申请日：1974-09-09
申请人： David B. Bell , John A. Cipher
发明人： David B. Bell , John A. Cipher
IPC分类号： H03J5/02 , H03J7/28 , H04B1/16
CPC分类号： H03J7/28 , H03J5/0245
摘要： Digitally controlled tuning by storing a digital code representative of the frequency of a selected channel and generating successive digital counts, each proportional to the number of cycles of an oscillator signal in each of a plurality of successive uniform sample intervals. The digital code is then compared with a digital count to generate a first output when equal, a second output when the code exceeds the count, and a third output when the count exceeds the code. The frequency of the oscillator is varied in response to one of the second and third outputs to increase or decrease the frequency, respectively, and to permit the frequency of the oscillator to lock in response to the first output signal.
摘要翻译：通过存储表示所选通道的频率的数字代码并产生连续的数字计数，每个与多个连续均匀采样间隔中的每一个中的振荡器信号的周期数成比例地进行数字控制调谐。然后将数字代码与数字计数进行比较，以在相等时产生第一输出，当代码超过计数时产生第二输出，以及当计数超过代码时产生第三输出。响应于第二和第三输出之一分别改变振荡器的频率以分别增加或减少频率，并且允许振荡器的频率响应于第一输出信号而锁定。

2. 发明授权

US3976943A Phase lock loop AM/FM receiver 失效
标题翻译：锁相环AM / FM接收器
公开(公告)号：US3976943A
公开(公告)日：1976-08-24
申请号：US498493
申请日：1974-08-19
申请人： John A. Cipher , Malcolm M. Lorang
发明人： John A. Cipher , Malcolm M. Lorang
IPC分类号： H03D5/00 , H03D3/02
CPC分类号： H03D5/00
摘要： A received radio signal is demodulated by applying it to a coherent demodulator loop for detection of a modulated input signal. The loop has a variable gain control capability. A gain control voltage dependent upon variations of amplitude of the input signal is then generated and is applied to control the gain within the loop.In one aspect, a received radio signal is demodulated by multiplying the signal with a local oscillator signal to produce two product voltages the first of which reflects exponential (EM frequency or phase) variations and may reflect amplitude variations in said radio signal and the second of which reflects only amplitude variations. The amplitude of the first product voltage is modified in dependence upon amplitude variations in the second product voltage whereby the modified first product voltage is an audio output voltage representative exclusively of exponential modulation of the radio signal and the second product voltage is an audio output voltage representative of amplitude modulation of the radio signal.
摘要翻译：通过将接收到的无线电信号应用于相干解调器回路来检测调制的输入信号来解调接收的无线电信号。循环具有可变增益控制功能。然后产生取决于输入信号的幅度变化的增益控制电压并且被施加以控制环路内的增益。

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