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2. 发明授权

US4163951A Frequency discriminator producing at least one of two pulse sequences representing in average the result of frequency discrimination 失效
标题翻译：频率鉴别器产生平均表示频率鉴别结果的两个脉冲序列中的至少一个
公开(公告)号：US4163951A
公开(公告)日：1979-08-07
申请号：US886699
申请日：1978-03-15
申请人： Shigenobu Aihara , Isao Haga , Motoo Mizumura
发明人： Shigenobu Aihara , Isao Haga , Motoo Mizumura
IPC分类号： H03K9/06 , H03C3/09 , H03D13/00 , H03K5/26 , H03L7/089 , H03B3/04 , H03K5/20
CPC分类号： H03L7/089 , H03C3/09 , H03D13/00 , H03C2200/0091
摘要： In a frequency discriminator for a first and a second input signal of a first and a second frequency, a phase detector produces first and second rectangular pulse sequences. When the first input signal leads the second by 0.degree. through 180.degree., the first pulse sequence takes a predetermined peak value with an instantaneous frequency corresponding to the phase difference while the second one continuously has the peak value. When the first input signal lags behind the second by 0.degree. through 180.degree., the second pulse sequence takes the peak value with the instantaneous frequency while the first one continuously has the peak value. A low-pass filter rejects components of the first pulse sequence which are higher than the first and second frequencies. A high-pass filter has a prescribed cutoff frequency for rejecting lower-frequency components of the low-pass output to produce an output pulse sequence representing in average the difference between the first and second frequencies when the first frequency is higher than the second. Alternatively or additionally, a similar set of a low-pass and a high-pass filter produces a like output pulse sequence when the first frequency is lower than the second. At least one of the output pulse sequences is used as a discriminator output signal either per se or after conversion to a substantially d.c. signal. The frequency discrimination characteristics depend on the prescribed cutoff frequency. In an automatic frequency control (AFC) loop, both d.c. signals may be supplied to a voltage controlled oscillator through a differential circuit.
摘要翻译：在用于第一和第二频率的第一和第二输入信号的鉴频器中，相位检测器产生第一和第二矩形脉冲序列。当第一个输入信号将第二个信号引导到0°到180°时，第一个脉冲序列取相应于相位差的瞬时频率的预定峰值，而第二个脉冲序列连续具有峰值。当第一输入信号滞后于0°至180°时，第二脉冲序列以瞬时频率取峰值，而第一脉冲序列连续具有峰值。低通滤波器抑制高于第一和第二频率的第一脉冲序列的分量。高通滤波器具有规定的截止频率，用于拒绝低通输出的低频分量，以产生当第一频率高于第二频率时平均表示第一和第二频率之间的差的输出脉冲序列。或者或另外，当第一频率低于第二频率时，类似的低通滤波器和高通滤波器产生类似的输出脉冲序列。至少一个输出脉冲序列本身或转换为基本上直流电后被用作鉴别器输出信号。信号。频率鉴别特性取决于规定的截止频率。在自动频率控制（AFC）回路中，两个直流信号可以通过差分电路提供给压控振荡器。

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