JPS55150111A - Coding method - Google Patents
Coding methodInfo
- Publication number
- JPS55150111A JPS55150111A JP5775079A JP5775079A JPS55150111A JP S55150111 A JPS55150111 A JP S55150111A JP 5775079 A JP5775079 A JP 5775079A JP 5775079 A JP5775079 A JP 5775079A JP S55150111 A JPS55150111 A JP S55150111A
- Authority
- JP
- Japan
- Prior art keywords
- mfm
- data
- coded
- component
- coding
- 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
Links
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Dc Digital Transmission (AREA)
Abstract
PURPOSE: To remove the DC component of the integral product of an MFM signal by performing the Modified Frequency Modulation(MFM) coding of data corresponding to preceding data.
CONSTITUTION: Through a group of gates, etc., opening and closing corresponding to the recording of preceding data, etc., initial data 0 of data sequence 011W10 is MFM-coded corresponding to the coding output of data 1 right after it and final 0 is MFM-coded into the inverted value of the MFM coding output of initial 0. Data 1 is MFM-coded into the inverted value of the MFM coding output of one past data 1. An MFM-coded signal like this contains no DC component by integration and removing the DC component eliminates the need for a DC amplifier, etc., so that low-frequency signals such as servo signals in magnetic recording, etc., will easily be extracted with precision.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5775079A JPS55150111A (en) | 1979-05-09 | 1979-05-09 | Coding method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5775079A JPS55150111A (en) | 1979-05-09 | 1979-05-09 | Coding method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55150111A true JPS55150111A (en) | 1980-11-21 |
Family
ID=13064562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5775079A Pending JPS55150111A (en) | 1979-05-09 | 1979-05-09 | Coding method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55150111A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4414659A (en) * | 1980-06-16 | 1983-11-08 | U.S. Philips Corporation | Method and apparatus for encoding digital data so as to reduce the D.C. and low frequency content of the signal |
-
1979
- 1979-05-09 JP JP5775079A patent/JPS55150111A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4414659A (en) * | 1980-06-16 | 1983-11-08 | U.S. Philips Corporation | Method and apparatus for encoding digital data so as to reduce the D.C. and low frequency content of the signal |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS52114312A (en) | Recorded medium and production method therefor | |
JPS52110003A (en) | Recording and reproducing apparatus | |
JPS57198546A (en) | Optical information recording and reproducing method | |
DE3382296D1 (en) | MAGNETIC RECORDING MEDIUM AND METHOD FOR PRODUCING A MAGNETIC RECORDING MEDIUM. | |
JPS55150111A (en) | Coding method | |
JPS56165910A (en) | Recording method of binary signal | |
JPS53111706A (en) | Recording and reproducing system for audio signals | |
JPS5624515A (en) | Removal of noise form signal | |
JPS5342002A (en) | Method for inspection of magnetic recording medium | |
JPS55150110A (en) | Coding method | |
JPS5234616A (en) | Magnetic video recording reproduction equipment | |
JPS53115209A (en) | Magnetic recording method | |
JPS52111313A (en) | Signal recording and reproducing method | |
JPS5373118A (en) | Positioning system for magnetic disk apparatus | |
JPS5733404A (en) | Magnetic recorder | |
JPS5667410A (en) | Stationary servo-device | |
JPS5625213A (en) | Magnetic recording and reproducing device | |
JPS5263313A (en) | Preparation for reproducing magnetic record | |
JPS5473614A (en) | Reading method of magnetic recorded information | |
JPS53116127A (en) | Magnetic recording-reproducing system | |
JPS51132933A (en) | Color magnetic telerecording regeneration apparatus | |
JPS5436915A (en) | Threshold value setting method in digital signal | |
JPS52141614A (en) | Magnetic recording reproduction device | |
JPS51135519A (en) | Recording method of video signal and aural signal | |
JPS5769574A (en) | Editing system of pulse code modulation magnetic sound recorder |