论文部分内容阅读
磁带记录器分两磁道分别记录数码信号和驱动码的钟频(f_c),采用锁相伺服系统控制磁带速度。设在fr=f_c/N时,N为正整数,磁带读出的钟频经N次分频后能锁定于f_r。在这样的锁相(即不跳周)条件下,能运用附加的环行寄存器,共容量为N位,以磁带读出的钟速率把磁带读出的数码信号(二进制电平)按顺序存入环行寄存器。然后以频率稳定的钟从环形寄存器顺序取出数码信号。这样取出的数码就完全消除了磁带记录器由于机械运动引起的数码相位抖动,其输出信号形式和记录时的数码信号形式完全一样。这种在锁相条件下的环形寄存器可称为最小容量的缓冲寄存器。
The tape recorder separately records the clock frequency (f_c) of the digital signal and the driving code in two tracks, and uses the phase-locked servo system to control the tape speed. When fr = f_c / N, N is a positive integer, and the clock frequency read by the tape can be locked to f_r after N times of frequency division. In this phase-locked (ie, non-jump-cycle) condition, an additional ring register can be used with a total capacity of N bits and the digital signals (binary level) read out by the tapes are stored in order at the clock rate at which the tape is read Ring register. The digital signal is then taken out sequentially from the ring register with a frequency-stable clock. This removed digital completely eliminates the digital phase jitter caused by mechanical movement of the tape recorder, and the output signal form is identical to the digital signal form recorded. This ring register under phase-locked conditions can be referred to as a buffer of the smallest size.