公开(公告)号：DE2431519A1

公开(公告)日：1975-01-30

申请号：DE2431519

申请日：1974-07-01

Applicant: IBM

Inventor： ALLMON DWIGHT GEORGE ,  COKER JUN CHARLES WALTER ,  LEE PEDRO

IPC: H03M5/12 ,  G06K7/016 ,  G06K7/10 ,  G11B20/14 ,  H04L25/49 ,  G11B5/02

Abstract: The advantages of Retrospective Pulse Modulation (RPM) decoding circuitry obtain as well for decoding information recorded in accordance with Pulse Rate Modulation (PRM) with this translating logical circuitry. Strobe pulse converting subcircuitry is arranged for detecting RPM impulses coinciding with PRM strobe impulses and inhibiting all other RPM Decoded (RPMD) strobe impulses. Other subcircuitry is arranged for translating RPMD data resulting from RPM scanning coding into (true) decoded PRM data. The subcircuits are integrated to take advantage of the inherent characteristics of the two codes for achieving the simplest circuit arrangements. A few conventional latching and gating circuits suffice for many applications. Further subcircuitry is arranged for automatically switching the translating logical circuitry for selectively decoding PRM and RPM coding without requiring the operator's attention.

公开(公告)号：CA1024654A

公开(公告)日：1978-01-17

申请号：CA203406

申请日：1974-06-25

Applicant: IBM

Inventor： ALLMON DWIGHT G ,  LEE PEDRO ,  COKER CHARLES W JR

IPC: H03M5/12 ,  G06K7/016 ,  G06K7/10 ,  G11B20/14 ,  H04L25/49 ,  G11B5/09

Abstract: The advantages of Retrospective Pulse Modulation (RPM) decoding circuitry obtain as well for decoding information recorded in accordance with Pulse Rate Modulation (PRM) with this translating logical circuitry. Strobe pulse converting subcircuitry is arranged for detecting RPM impulses coinciding with PRM strobe impulses and inhibiting all other RPM Decoded (RPMD) strobe impulses. Other subcircuitry is arranged for translating RPMD data resulting from RPM scanning coding into (true) decoded PRM data. The subcircuits are integrated to take advantage of the inherent characteristics of the two codes for achieving the simplest circuit arrangements. A few conventional latching and gating circuits suffice for many applications. Further subcircuitry is arranged for automatically switching the translating logical circuitry for selectively decoding PRM and RPM coding without requiring the operator's attention.