公开(公告)号：US3922613A

公开(公告)日：1975-11-25

申请号：US53798875

申请日：1975-01-02

申请人： HONEYWELL INF SYSTEMS

发明人： ALLEN WILLIAM REED ,  DELORENZO JOHN D

IPC分类号： G11B20/14 ,  G11B5/45 ,  H03K5/18

CPC分类号： G11B20/1419

摘要： Double transition recorded information, such as phase encoded or frequency encoded information, is detected by use of a digital tracking oscillator which is responsive to either the data or the clock transitions of the recorded information and which produces a string of pulses in response thereto having a frequency which changes dependent upon the frequency of occurrence of the information. Clock pulses, and accordingly, a window, are thus generated, bracketing the data substantially in accordance with predetermined criteria, thereby enabling effective detection of the data included in the information. The digital tracking oscillator is adaptive to different propagation delays and drifts which may be introduced by the various circuit elements and thus needs no further adjustment therefor and may accordingly be manufactured on a single integrated circuit chip. The oscillator is also adaptive to changes in the frequency of the reading of the recorded information. This adaptive technique thus improves upon the effective detection of the data included in the information.

摘要翻译： 通过使用响应于记录信息的数据或时钟转换的数字跟踪振荡器来检测双转换记录信息，例如相位编码或频率编码信息，并响应于该脉冲产生一串脉冲，具有 变化的频率取决于信息的发生频率。 因此，产生时钟脉冲，因此产生窗口，基本上按照预定标准包围数据，从而能够有效地检测信息中包括的数据。 数字跟踪振荡器适应于可由各种电路元件引入的不同传播延迟和漂移，并且因此不需要进一步的调整，因此可以在单个集成电路芯片上制造。 振荡器也适应于读取记录信息的频率的变化。 因此，该自适应技术改进了对信息中包括的数据的有效检测。