JPS5661013A - Modulation/demodulation circuit for digital signal - Google Patents
Modulation/demodulation circuit for digital signalInfo
- Publication number
- JPS5661013A JPS5661013A JP13598579A JP13598579A JPS5661013A JP S5661013 A JPS5661013 A JP S5661013A JP 13598579 A JP13598579 A JP 13598579A JP 13598579 A JP13598579 A JP 13598579A JP S5661013 A JPS5661013 A JP S5661013A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- modulation
- digital signal
- width
- reproduction
- 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
- Signal Processing For Digital Recording And Reproducing (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Dc Digital Transmission (AREA)
Abstract
PURPOSE: To enable the recording/reproduction with high density and reliability, by modulating a digital signal on a signal having the time width of the n-th power of 2, determined for n-bit digital signal and demodulation it.
CONSTITUTION: Digital signal in 2-bits etc. from a digital device 100 is converted into a signal having the time width of the second power 2 in which the increment of the width is changed by (v) at a signal value time generating circuit 20 via an input circuit 10. Next, it is fed to a recording and reproducing device 200 as being a modulation signal the level of which is altenately inverted at a binary inverting output circuit 30. In this modulation signal, in comparison with other modulation systems such as PE system, the maximum period width Tmax and minimum period width Tmin are respectively greater and the used frequency band is narrower. Accordingly, the recording/reproduction with high density and reliability can be performed. Further, the demodulation to digital signal at reproduction can be performed inversely the same as modulation.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13598579A JPS5661013A (en) | 1979-10-23 | 1979-10-23 | Modulation/demodulation circuit for digital signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13598579A JPS5661013A (en) | 1979-10-23 | 1979-10-23 | Modulation/demodulation circuit for digital signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5661013A true JPS5661013A (en) | 1981-05-26 |
| JPS6123591B2 JPS6123591B2 (en) | 1986-06-06 |
Family
ID=15164487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13598579A Granted JPS5661013A (en) | 1979-10-23 | 1979-10-23 | Modulation/demodulation circuit for digital signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5661013A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS647900A (en) * | 1987-06-30 | 1989-01-11 | Rohm Co Ltd | Code communicating system for remote control system |
| JP2008543219A (en) * | 2005-06-29 | 2008-11-27 | アップル インコーポレイテッド | Method and apparatus for improving data transfer rate over a communication channel |
-
1979
- 1979-10-23 JP JP13598579A patent/JPS5661013A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS647900A (en) * | 1987-06-30 | 1989-01-11 | Rohm Co Ltd | Code communicating system for remote control system |
| JPH056959B2 (en) * | 1987-06-30 | 1993-01-27 | Rohm Kk | |
| JP2008543219A (en) * | 2005-06-29 | 2008-11-27 | アップル インコーポレイテッド | Method and apparatus for improving data transfer rate over a communication channel |
| JP4829962B2 (en) * | 2005-06-29 | 2011-12-07 | アップル インコーポレイテッド | Method and apparatus for improving data transfer rate over a communication channel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6123591B2 (en) | 1986-06-06 |
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