JPS5637813A - Signal demodulation system of magnetic memory unit - Google Patents
Signal demodulation system of magnetic memory unitInfo
- Publication number
- JPS5637813A JPS5637813A JP11022879A JP11022879A JPS5637813A JP S5637813 A JPS5637813 A JP S5637813A JP 11022879 A JP11022879 A JP 11022879A JP 11022879 A JP11022879 A JP 11022879A JP S5637813 A JPS5637813 A JP S5637813A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- jitters
- output
- demodulation
- sampling
- 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)
Abstract
PURPOSE: To reduce the error rate of signal demodulation by genetating sampling pulses from the output signal of a waveform equalizing filter and then by removing the part where the jitters possibly increase by a data discrimination window pulse.
CONSTITUTION: Since pattern 10101010 is used for the gap part of the magnetic disk unit employing the MFM system, output waveform E of waveform equalizing filter 8 shows a sine wave, and consequently the jitters at the zero-cross point of differential output F are less, so that it will suit to the synchronizing pattern of PLL15. Inputting pulse I like this to PLL shortens the lead-in time and also obtains a sampling pulse with the less jitters. Sampling pulse J from PLL15 and data discrimination window pulse H from slicer 13 are applied to code detecting circuit 16 and "1" when pulse H is at a high level when the smapling pulse falls or "0" when at a low level is outputted, sending demodulation output K. Thus, the error rate of the demodulation can be reduced.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11022879A JPS5637813A (en) | 1979-08-31 | 1979-08-31 | Signal demodulation system of magnetic memory unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11022879A JPS5637813A (en) | 1979-08-31 | 1979-08-31 | Signal demodulation system of magnetic memory unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5637813A true JPS5637813A (en) | 1981-04-11 |
Family
ID=14530331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11022879A Pending JPS5637813A (en) | 1979-08-31 | 1979-08-31 | Signal demodulation system of magnetic memory unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5637813A (en) |
-
1979
- 1979-08-31 JP JP11022879A patent/JPS5637813A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS6471326A (en) | Method of demodulating bi-phase signal | |
US4535306A (en) | Phase-locked loop detecting circuit | |
JPS54102811A (en) | Signal system | |
US4617526A (en) | Sync responsive clock generator for digital demodulators | |
US4141046A (en) | Floppy disc data separator for use with single density encoding | |
JPS5637813A (en) | Signal demodulation system of magnetic memory unit | |
JPS576423A (en) | Demodulating circuit of mfm modulation signal | |
EP0023783A1 (en) | Data recovery circuit | |
JPH0381219B2 (en) | ||
JPS5444508A (en) | Pcm signal demodulator | |
JPS5943860B2 (en) | Frame synchronization signal detection circuit | |
JPH01278177A (en) | Equipment and method for data re-reading restoration of run-length limiting code | |
JPS5562517A (en) | Reproducing system of magnetic storage device | |
JPS6444648A (en) | Malfunction preventing circuit for serial signal transmission system | |
JPH0352699B2 (en) | ||
JPS5597015A (en) | Recording method | |
SU633064A1 (en) | Apparatus for reproducing phase-modulated signal from magnetic record carrier | |
JPS5349910A (en) | Video signal process system using rotary recording medium | |
JPS57154613A (en) | Digital modulating system | |
JPH02141970A (en) | Signal demodulation circuit for optical disk | |
JPS5327012A (en) | Vibration sense level detecting system | |
JPS6478058A (en) | Carrier recovery circuit | |
JPS55122215A (en) | Code detection system of magnetic memory unit | |
JPH0526273B2 (en) | ||
JPS6217307B2 (en) |