公开(公告)号：US3665327A

公开(公告)日：1972-05-23

申请号：US3665327D

申请日：1969-11-14

Applicant: IBM

Inventor： PRENTKY PETER I ,  WILSON ALONZO A

IPC: G11B5/09 ,  H03K5/12 ,  H03K5/1532 ,  H03K5/19 ,  H03K5/22

CPC classification number: H03K5/19 ,  H03K5/12 ,  H03K5/22

Abstract: In a digital data detection system in which a readout signal derived from a magnetic recording of the data in encoded form is differentiated to identify the various data and clock bits represented by the peaks thereof, a discriminator is provided for eliminating shoulder noise pulses from the differentiated signal prior to the separation of the various zero-crossings thereof into ''''ones'''' and ''''zeros'''' at the output. The discriminator includes two symmetrical complementary channels through which the data and clock bits are alternately passed. The data and clock bits are delayed at the channel inputs for a period of time at least equal to the duration of the shoulder noise pulses to eliminate those noise pulses which occur prior to a valid date or clock bit. Each channel is inhibited for a selected period of time after the occurrence of a valid data of clock bit therein to eliminate noise pulses occuring subsequent to the valid bits.