JPS5687209A - Digital modulating circuit - Google Patents
Digital modulating circuitInfo
- Publication number
- JPS5687209A JPS5687209A JP16295479A JP16295479A JPS5687209A JP S5687209 A JPS5687209 A JP S5687209A JP 16295479 A JP16295479 A JP 16295479A JP 16295479 A JP16295479 A JP 16295479A JP S5687209 A JPS5687209 A JP S5687209A
- Authority
- JP
- Japan
- Prior art keywords
- bits
- pulse
- detection pulse
- detection
- bit
- 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
- Dc Digital Transmission (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
PURPOSE: To obtain an M2FM modulating circuit that provides high-density recording, by adding a condition circuit to the M2FM modulating circuit.
CONSTITUTION: From NRZ (Non-Return to Zero) type input data, a detection pulse of bit "1" and another detection pulse for a boundrary between bits "0" are generated and the latter pulse is counted is FF, whose output is read by delay D-FF that receives as a clock a pulse having position information in the middle of data bits and equal in period to data bits so that the boundary detection pulse will be in the middle of the D-FF output. Then, FF is cleared with the detection pulse of bit "1" to determine the starting and ending points of continuous bits "0" and when ≤3 bits "0" continue, only odd-numbered detection pulses are extracted to perform logical operation between the detection pulse of bit "1" and the detection pulses for a boundary between odd-numbered bits "0" before NRZI modulation. In the figure, D (DeLay)-FFs are represented as A and H, OR circuits as B, C and I, NAND circuits as D and E, and FFs as G and F.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16295479A JPS5687209A (en) | 1979-12-14 | 1979-12-14 | Digital modulating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16295479A JPS5687209A (en) | 1979-12-14 | 1979-12-14 | Digital modulating circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5687209A true JPS5687209A (en) | 1981-07-15 |
Family
ID=15764421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16295479A Pending JPS5687209A (en) | 1979-12-14 | 1979-12-14 | Digital modulating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5687209A (en) |
-
1979
- 1979-12-14 JP JP16295479A patent/JPS5687209A/en active Pending
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