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    • 62. 发明专利
    • Pll circuit
    • PLL电路
    • JP2014187557A
    • 2014-10-02
    • JP2013061190
    • 2013-03-23
    • Yamaha Corpヤマハ株式会社
    • SAWARA TAKUYA
    • H03L7/095H03K5/19H03L7/093H03L7/14H04L7/033
    • H03L7/08H03L7/14
    • PROBLEM TO BE SOLVED: To provide a PLL circuit that can minimize a fluctuation in the frequency of a generated clock and continue outputting an audio signal instead of muting the audio signal even if an anomaly is detected in an external clock.SOLUTION: The PLL circuit for generating a generated clock synchronized with an external clock by a phase-locked loop includes first detection means for detecting whether or not the generated clock is synchronized with the external clock, and measurement means for measuring at least either of a high time from a rise to a fall of the external clock and a low time from a fall to a rise thereof. When it is detected that a variation in the high time or the low time has become equal to or greater than a predetermined value as the generated clock is synchronized with the external clock, the frequency of the generated clock is fixed at a frequency output at the time point and the output of the generated clock is continued.
    • 要解决的问题:提供一种可以使产生的时钟的频率波动最小化的PLL电路,并且即使在外部时钟中检测到异常,也可继续输出音频信号而不是静音音频信号。解决方案:PLL电路 用于通过锁相环产生与外部时钟同步的产生的时钟,包括用于检测所产生的时钟是否与外部时钟同步的第一检测装置,以及用于测量从上升到高的时间中的至少一个的测量装置 到外部时钟的下降,并从低到高的时间。 当产生的时钟与外部时钟同步时,当检测到高时间或低时间的变化已经变得等于或大于预定值时,所产生的时钟的频率固定在 时间点和生成的时钟的输出继续。
    • 69. 发明专利
    • Phase synchronization circuit and phase comparison method
    • 相位同步电路和相位比较方法
    • JP2013197808A
    • 2013-09-30
    • JP2012061915
    • 2012-03-19
    • Fujitsu Ltd富士通株式会社
    • HONGO HIRONOBU
    • H03L7/14G06F1/12H03K5/26H03L7/08H03L7/10
    • H03L7/08H03L7/085
    • PROBLEM TO BE SOLVED: To improve the followability of an output signal against a change in an input signal.SOLUTION: A frequency divider 1a divides the frequency of an input signal. An LPF 1b has input thereto a signal having an average phase calculated by a calculation unit 1e, which was frequency divided by the frequency divider 1a. The LPF 1b cuts the high frequency component of the input signal before it is output. A VCO 1c varies the frequency of an output signal on the basis of the signal output from the LPF 1b. A frequency divider 1d divides the frequency of the signal output by the VCO 1c. The calculation unit 1e calculates a difference in phase between a signal REF output by the frequency divider 1a and a signal COMP output by the frequency divider 1d during phases N0 to N1023 within one cycle of the signal REF output by the frequency divider 1a, and calculates the average of the phase differences.
    • 要解决的问题:提高输出信号对输入信号变化的跟随性。解决方案:分频器1a分频输入信号的频率。 LPF 1b向其输入具有由分频器1a分频的计算单元1e计算的平均相位的信号。 LPF 1b在输出信号输入之前切断输入信号的高频分量。 VCO 1c基于从LPF 1b输出的信号来改变输出信号的频率。 分频器1d分频由VCO 1c输出的信号的频率。 计算单元1e计算由分频器1a输出的信号REF与由分频器1a输出的信号REF的一个周期内的相位N0至N1023期间由分频器1d输出的信号COMP之间的相位差,并且计算 相位差的平均值。