JPS5637813A - Signal demodulation system of magnetic memory unit - Google Patents

Signal demodulation system of magnetic memory unit

Info

Publication number
JPS5637813A
JPS5637813A JP11022879A JP11022879A JPS5637813A JP S5637813 A JPS5637813 A JP S5637813A JP 11022879 A JP11022879 A JP 11022879A JP 11022879 A JP11022879 A JP 11022879A JP S5637813 A JPS5637813 A JP S5637813A
Authority
JP
Japan
Prior art keywords
pulse
jitters
output
demodulation
sampling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11022879A
Other languages
Japanese (ja)
Inventor
Hitoshi Takagi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP11022879A priority Critical patent/JPS5637813A/en
Publication of JPS5637813A publication Critical patent/JPS5637813A/en
Pending legal-status Critical Current

Links

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  • Dc Digital Transmission (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE: To reduce the error rate of signal demodulation by genetating sampling pulses from the output signal of a waveform equalizing filter and then by removing the part where the jitters possibly increase by a data discrimination window pulse.
CONSTITUTION: Since pattern 10101010 is used for the gap part of the magnetic disk unit employing the MFM system, output waveform E of waveform equalizing filter 8 shows a sine wave, and consequently the jitters at the zero-cross point of differential output F are less, so that it will suit to the synchronizing pattern of PLL15. Inputting pulse I like this to PLL shortens the lead-in time and also obtains a sampling pulse with the less jitters. Sampling pulse J from PLL15 and data discrimination window pulse H from slicer 13 are applied to code detecting circuit 16 and "1" when pulse H is at a high level when the smapling pulse falls or "0" when at a low level is outputted, sending demodulation output K. Thus, the error rate of the demodulation can be reduced.
COPYRIGHT: (C)1981,JPO&Japio
JP11022879A 1979-08-31 1979-08-31 Signal demodulation system of magnetic memory unit Pending JPS5637813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11022879A JPS5637813A (en) 1979-08-31 1979-08-31 Signal demodulation system of magnetic memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11022879A JPS5637813A (en) 1979-08-31 1979-08-31 Signal demodulation system of magnetic memory unit

Publications (1)

Publication Number Publication Date
JPS5637813A true JPS5637813A (en) 1981-04-11

Family

ID=14530331

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11022879A Pending JPS5637813A (en) 1979-08-31 1979-08-31 Signal demodulation system of magnetic memory unit

Country Status (1)

Country Link
JP (1) JPS5637813A (en)

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