会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明授权
    • Frequency control circuits such as for use in modulation measurement
    • 频率控制电路,如用于调制测量
    • US3992670A
    • 1976-11-16
    • US565017
    • 1975-04-03
    • Derek R. GittinsMichael D. Gregory
    • Derek R. GittinsMichael D. Gregory
    • G01R23/14G01R29/06H04B17/00
    • G01R29/06G01R23/14
    • A circuit responsive to an input signal having an unspecified frequency for converting it to a predetermined and constant means frequency, and particularly suitable for incorporation in a modulation measuring instrument, comprises a sampling mixer controlled by a variable frequency oscillator for sampling the input signal to produce an intermediate signal. The mean frequency of the intermediate signal is then compared with a reference representing a predetermined frequency value whereby to produce an error signal, and means responsive to the error signal adjusts the frequency of the oscillator in such a direction as to tend to hold the mean value of the frequency of the intermediate signal at the predetermined frequency value while preserving therein variations in amplitude and/or frequency due to amplitude and/or frequency modulation.
    • 响应于具有未指定频率的输入信号的电路将其转换为预定和恒定的装置频率,并且特别适合于并入调制测量仪器中的电路包括由可变频率振荡器控制的采样混频器,用于对输入信号进行采样以产生 一个中间信号。 然后将中间信号的平均频率与表示预定频率值的参考值进行比较,从而产生误差信号,并且响应于误差信号的装置调整振荡器的频率以使得趋于保持平均值 以预定频率值的中间信号的频率,同时由于幅度和/或频率调制而在其中维持幅度和/或频率的变化。