JPS5477116A - Data recording apparatus - Google Patents

Data recording apparatus

Info

Publication number
JPS5477116A
JPS5477116A JP14397477A JP14397477A JPS5477116A JP S5477116 A JPS5477116 A JP S5477116A JP 14397477 A JP14397477 A JP 14397477A JP 14397477 A JP14397477 A JP 14397477A JP S5477116 A JPS5477116 A JP S5477116A
Authority
JP
Japan
Prior art keywords
signals
frequency
recording
reproducing speed
frequencies
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
JP14397477A
Other languages
Japanese (ja)
Other versions
JPS5843809B2 (en
Inventor
Wataru Kosuge
Masao Teraoka
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
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone Corp
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, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP52143974A priority Critical patent/JPS5843809B2/en
Publication of JPS5477116A publication Critical patent/JPS5477116A/en
Publication of JPS5843809B2 publication Critical patent/JPS5843809B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE: To accurately reproduce the recording medium of varying recording and reproducing speed in a Frequency Shift Keying system by detecting the ratio of the two reproduced signals which are separated by the superposed record of reference signals.
CONSTITUTION: The reference signals of frequency f0 of a reference signal generator 4 are superposed upon the recording signals of frequency f1 from a signal source 1 so that they are recorded in a recording medium such as a magnetic tape. If the reproducing speed is varied for the recording speed, the frequency of the reproduced signals is varied with the variation in the reproducing speed so that the frequencies of the recording and reference signals separated by a band filter become (1+Δ)f1 and (1+Δ)f0. If the ratio of the frequencies of the two signals is detected by an AND gate, the variation is cancelled. If the processing is carried out with the use of an OR gate or the like, it is possible to accurately produce the information corresponding to the initial signal frequency.
COPYRIGHT: (C)1979,JPO&Japio
JP52143974A 1977-12-02 1977-12-02 Data recording method Expired JPS5843809B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52143974A JPS5843809B2 (en) 1977-12-02 1977-12-02 Data recording method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52143974A JPS5843809B2 (en) 1977-12-02 1977-12-02 Data recording method

Publications (2)

Publication Number Publication Date
JPS5477116A true JPS5477116A (en) 1979-06-20
JPS5843809B2 JPS5843809B2 (en) 1983-09-29

Family

ID=15351373

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52143974A Expired JPS5843809B2 (en) 1977-12-02 1977-12-02 Data recording method

Country Status (1)

Country Link
JP (1) JPS5843809B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116748U (en) * 1985-12-19 1986-07-23

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9849742B2 (en) 2015-06-26 2017-12-26 Theodore J. Klouzal Maneuverable platforms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116748U (en) * 1985-12-19 1986-07-23

Also Published As

Publication number Publication date
JPS5843809B2 (en) 1983-09-29

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