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    • 3. 发明授权
    • 위상 어큐뮬레이터의 성능 개선회로
    • 相间歇仪
    • KR1019940006929B1
    • 1994-07-29
    • KR1019910022466
    • 1991-12-07
    • 한국전자통신연구원
    • 정용주최각진김영일전용태김도욱
    • H03K4/00
    • The performance improving circuit of a phase accumulator comprises a digital-to-analog (D/A) converter for converting an instantaneous value of an accumulated phase value which is an output of a phase accumulator to an analog phase value, a low-pass filter for receiving an output of the D/A converter to generate a signal in which a higher harmonics component is eliminated, a comparator for receiving an output of the low-pass filter and a reference phase and detecting a point that an accumulated phase analog value passing through the low-pass filter becomes identical to the reference phase, and a logical product processor for logical product processing the accumulated phase value of the phase accumulator and an output of the comparator to be supplied as an initialized signal of the phase accumulator, thereby eliminating an periodic error of the phase accumulator.
    • 相位累加器的性能改善电路包括数模(D / A)转换器,用于将作为相位累加器的输出的累积相位值的瞬时值转换为模拟相位值,低通滤波器 用于接收D / A转换器的输出以产生消除高次谐波分量的信号;比较器,用于接收低通滤波器的输出和参考相位,并检测累加相位模拟值通过的点 通过低通滤波器变得与参考相位相同,以及逻辑积处理器,用于逻辑积处理相位累加器的累积相位值和比较器的输出,作为相位累加器的初始化信号提供,从而消除 相位累加器的周期性误差。
    • 8. 发明授权
    • 중앙처리장치와 주변입출력장치와의 인터페이스 회로
    • 中央处理单元和外设I /
    • KR1019910008420B1
    • 1991-10-15
    • KR1019890010354
    • 1989-07-21
    • 한국전자통신연구원주식회사 케이티
    • 이경준전용태
    • G06F13/28
    • The feature is compatibility to interface between CPU (2a) and peripherial I/O device (2b) having different timing sequence and bus and control signal characteristics. Interfacing scheme is implemented with shift register (2c), memory control signal generator (2d), buffer circuit (2e), 'NAND' gate (2j) and inverter (2k). (2c) decides bus enabling period and memory control signal generating point synchronizing with system clock of CPU. (2d) is associated with the shift register and flip-flop (2f) and provides control signal according to the characteristics of peripheral device (2a) when DMA operation. And the buffer transfers control and address signals to control DMA operating signal. So it can be used in interfacing CPU of DC adaptor and packet controller for PC networking.
    • 该特征是具有不同定时序列和总线和控制信号特性的CPU(2a)和周边I / O设备(2b)之间的接口的兼容性。 接口方案采用移位寄存器(2c),存储控制信号发生器(2d),缓冲电路(2e),“非”门(2j)和反相器(2k)。 (2c)决定总线使能期间和与CPU的系统时钟同步的存储器控​​制信号发生点。 (2d)与移位寄存器和触发器(2f)相关联,并且当DMA操作时根据外围设备(2a)的特性提供控制信号。 并且缓冲器传送控制和地址信号以控制DMA操作信号。 因此,它可以用于连接PC适配器的CPU和PC组网的分组控制器。