JPS5477116A - Data recording apparatus - Google Patents
Data recording apparatusInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61116748U (en) * | 1985-12-19 | 1986-07-23 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9849742B2 (en) | 2015-06-26 | 2017-12-26 | Theodore J. Klouzal | Maneuverable platforms |
-
1977
- 1977-12-02 JP JP52143974A patent/JPS5843809B2/en not_active Expired
Cited By (1)
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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