JPS554758A - Magnetic disc device - Google Patents
Magnetic disc deviceInfo
- Publication number
- JPS554758A JPS554758A JP7785078A JP7785078A JPS554758A JP S554758 A JPS554758 A JP S554758A JP 7785078 A JP7785078 A JP 7785078A JP 7785078 A JP7785078 A JP 7785078A JP S554758 A JPS554758 A JP S554758A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- data
- bit
- equalizing filter
- discrimination window
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/027—Analogue recording
- G11B5/035—Equalising
Landscapes
- Digital Magnetic Recording (AREA)
- Dc Digital Transmission (AREA)
Abstract
PURPOSE:To reproduce data without adjusting the characteristic of an equalizing filter according to the track position by masking a specific data discrimination window when partial response-system data recorded on a magnetic disc is reproduced. CONSTITUTION:The read signal of data written on disc 5 in the partial response- system where the inter-bit correlation is taken and converted in two steps is applied to code detection circuit 16 through zero crossing detection circuit 14 and phase synchronizing circuit PLL 15, and a bit code is detected according to the discrimination window, which is outputted from AND circuit 21 through waveform equalizing filter 8 and slice circuit 11, and is demodulated. This gate 21 is controlled by one- bit delay circuit 17, peak detection circuit 18 connected to circuit 15, shift register 19 for 1 or 2-bit delay, NAND circuit 20, etc., and if four or more bits ''1'' are continuous in write data, the discrimination window for a prescribed number of bits is masked, and erroneous detection is prevented even at an external circumference track read time of a large output, so taht the adjustment of the equalizing filter according to the track position is not required, and the reproducing system of the device can be simplified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7785078A JPS554758A (en) | 1978-06-27 | 1978-06-27 | Magnetic disc device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7785078A JPS554758A (en) | 1978-06-27 | 1978-06-27 | Magnetic disc device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS554758A true JPS554758A (en) | 1980-01-14 |
Family
ID=13645523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7785078A Pending JPS554758A (en) | 1978-06-27 | 1978-06-27 | Magnetic disc device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS554758A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03166839A (en) * | 1989-11-27 | 1991-07-18 | Matsushita Electric Ind Co Ltd | Digital information detecting device |
| US5327298A (en) * | 1992-09-10 | 1994-07-05 | International Business Machines Corporation | Noise minimization for magnetic data storage drives using oversampling techniques |
-
1978
- 1978-06-27 JP JP7785078A patent/JPS554758A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03166839A (en) * | 1989-11-27 | 1991-07-18 | Matsushita Electric Ind Co Ltd | Digital information detecting device |
| US5327298A (en) * | 1992-09-10 | 1994-07-05 | International Business Machines Corporation | Noise minimization for magnetic data storage drives using oversampling techniques |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1513634A (en) | Data recovery system | |
| JPS554758A (en) | Magnetic disc device | |
| MY119205A (en) | Method, device, and medium for recording digital signals | |
| JPS53144707A (en) | Signal detecting system by variable thresholds | |
| JPS53149308A (en) | Recorder-reproducer of digital signals | |
| JPS57164443A (en) | Optical recording medium and information reproducing device | |
| JPS537309A (en) | Digital information reproduction device | |
| JPS6489083A (en) | Data reproducing device | |
| JPS5528547A (en) | Magnetic recorder/reproducer | |
| SU1068985A1 (en) | Device for magnetic recording/reproducing of pulse signals | |
| CA2021681A1 (en) | Information recording and reproducing device | |
| JPS62121967A (en) | Magnetic memory device | |
| JPS6316467A (en) | Magnetic recording and reproducing device | |
| GB1508320A (en) | Circuit arrangements for calibrating signals | |
| JPS52102012A (en) | Signal recorder/reproducer by pcm system | |
| JPS5715266A (en) | Signal recording system for position retrieval of rotary information recording medium | |
| SU949679A1 (en) | Method of reproducing digital data from magnetic carrier | |
| JPS52102010A (en) | Signal recorder/reproducer by pcm system | |
| SU624268A1 (en) | Device for reproducing phase-modulated signals | |
| JPS558603A (en) | Head position detection system on rotary recording medium | |
| JPS5644171A (en) | Pcm recording and reproducing device | |
| JPS5241508A (en) | Magnetic recording/reproding system | |
| JPS56148752A (en) | Magnetic tape device | |
| JPS5641566A (en) | Digital signal recording and reproducing system | |
| JPS5587314A (en) | Method and device for magnetic recording and reproduction |