Apparatus for recording and reproducing digital signal.,申请号EP19860108246-传众专利搜索

Apparatus for recording and reproducing digital signal.

申请公布号：EP0206221(A2)

申请号：EP19860108246

申请日期：1986.06.17

申请公布日期：1986.12.30

申请人：

SHARP KABUSHIKI KAISHA

发明人：II, HIROSHI;KOYANAGI, KATSUBUMI;YASUDA, SYUHEI

分类号：G11B20/14;G11B20/10;G11B20/22;(IPC1-7):G11B20/10

主分类号：G11B20/14

摘要：<p>An apparatus for recording and reproducing data signal carrying digital information at each reference phase (pi) appearing periodically includes detector (ZC, PD, 8, PCL) for detecting and producing a phase data at each sampling point. Two subsequently sampled phase data (Pi, Pi+1) are stored in latches (15, 14) for use in three comparators (17, 18, 19). The first comparator (18) compares the first sampled phase data (Pi+1) and the second sampled phase data (Pi). The second comparator (19) compares the first sampled phase data (Pi+1) with a predetermined value (N/2), and the third comparator (17) compares the second sampled phase data (Pi) with the predetermined value (N/2). Utilizing the outputs of the three comparators, a phase condition detector (20) detects whether or not a reference phase (pi) is contained between the two subsequent sampling points. A detection pulse generator (24, 26) is provided which generates a data detection pulse when the phase condition detector (20) detects the reference phase (pi).</p>