JPS5765947A - Mfm reproducing circuit - Google Patents

Mfm reproducing circuit

Info

Publication number
JPS5765947A
JPS5765947A JP55142111A JP14211180A JPS5765947A JP S5765947 A JPS5765947 A JP S5765947A JP 55142111 A JP55142111 A JP 55142111A JP 14211180 A JP14211180 A JP 14211180A JP S5765947 A JPS5765947 A JP S5765947A
Authority
JP
Japan
Prior art keywords
signal
mfm
mfm signal
time
dropout
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.)
Granted
Application number
JP55142111A
Other languages
Japanese (ja)
Other versions
JPS6357874B2 (en
Inventor
Hiroyuki Kimura
Yasunori Kanazawa
Keizo Nishimura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP55142111A priority Critical patent/JPS5765947A/en
Priority to DE3140431A priority patent/DE3140431C2/en
Priority to US06/311,023 priority patent/US4472686A/en
Publication of JPS5765947A publication Critical patent/JPS5765947A/en
Publication of JPS6357874B2 publication Critical patent/JPS6357874B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4904—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using self-synchronising codes, e.g. split-phase codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • H04L7/0066—Detection of the synchronisation error by features other than the received signal transition detection of error based on transmission code rule
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/042—Detectors therefor, e.g. correlators, state machines

Abstract

PURPOSE:To reproduce a correct MFM signal even for signal dropout, by reading out an MFM signal, which is stored preliminarily and is to be supplied, from a memory on a basis of the dropout time and MFM signal values before and after the dropout time and supplying this MFM signal in the dropout time when the signal is dropped out. CONSTITUTION:An inputted MFM signal is delayed by a shift register 33, and normally, it is outputted through multiplexers 34 and 35. A counter 44 counts the time between changed points of the MFM signal at the MFM signal detection time, and a shift register 30 stores values just before the preceeding change point and just after the succeeding change point of the MFM signal, and an MFM signal pattern which is stored and is to be supplied is outputted from a read-only memory 31 by outputs of the counter 44 and the shift register 30, and the generated MFM signal pattern is inserted as a dropped-out MFM signal by multiplexers 34 and 35 operated at the signal dropout time.
JP55142111A 1980-10-13 1980-10-13 Mfm reproducing circuit Granted JPS5765947A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP55142111A JPS5765947A (en) 1980-10-13 1980-10-13 Mfm reproducing circuit
DE3140431A DE3140431C2 (en) 1980-10-13 1981-10-12 Demodulator circuit for demodulating a modulated digital signal
US06/311,023 US4472686A (en) 1980-10-13 1981-10-13 Circuit for reproducing and demodulating modulated digital signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55142111A JPS5765947A (en) 1980-10-13 1980-10-13 Mfm reproducing circuit

Publications (2)

Publication Number Publication Date
JPS5765947A true JPS5765947A (en) 1982-04-21
JPS6357874B2 JPS6357874B2 (en) 1988-11-14

Family

ID=15307668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55142111A Granted JPS5765947A (en) 1980-10-13 1980-10-13 Mfm reproducing circuit

Country Status (1)

Country Link
JP (1) JPS5765947A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5990448A (en) * 1982-11-16 1984-05-24 Toshiba Corp Demodulating system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5990448A (en) * 1982-11-16 1984-05-24 Toshiba Corp Demodulating system
JPH0347617B2 (en) * 1982-11-16 1991-07-19 Tokyo Shibaura Electric Co

Also Published As

Publication number Publication date
JPS6357874B2 (en) 1988-11-14

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