JPS6482303A - Reproducing circuit for magnetic recording and reproducing device - Google Patents
Reproducing circuit for magnetic recording and reproducing deviceInfo
- Publication number
- JPS6482303A JPS6482303A JP23712987A JP23712987A JPS6482303A JP S6482303 A JPS6482303 A JP S6482303A JP 23712987 A JP23712987 A JP 23712987A JP 23712987 A JP23712987 A JP 23712987A JP S6482303 A JPS6482303 A JP S6482303A
- Authority
- JP
- Japan
- Prior art keywords
- level
- pulse
- time
- peak
- interval
- 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
Abstract
PURPOSE:To always obtain as optimum equalization characteristic by evaluating a time difference between a peak interval of a reproducing signal and the case of a correct peak interval, and controlling a constant of an equalizer so that the time difference is eliminated. CONSTITUTION:A two-bit pattern is reproduced, and a peak pulse is generated by a pulse forming circuit 104, and converted to a level of a voltage or a current by a time level converting circuit 111 in order to derive a time interval of a peak pulse of the front part and a peak pulse of the rear part. The converted level is held until a peak pulse of the next two-bit pattern comes, and at the time point when said pulse has come, discharge is started, and the next two-bit pattern is awaited. While the level is being held, a detected level Vn 114 and a reference level Vr 115 in case of a correct bit interval are compared by a level comparator circuit 112. At that time, if there is a difference in the levels, it is outputted as an error signal to an equalizer control circuit 106, and a constant of an equalizer 103 is controlled so that the error signal is eliminated. In such a way, an optimum equalization characteristic can always be maintained.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62237129A JP2664160B2 (en) | 1987-09-24 | 1987-09-24 | Reproducing circuit of magnetic recording / reproducing device |
| US07/248,123 US4907100A (en) | 1987-09-24 | 1988-09-23 | Readout circuit in magnetic recording device |
| US07/489,322 US5008761A (en) | 1987-09-24 | 1990-03-05 | Readout circuit in magnetic recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62237129A JP2664160B2 (en) | 1987-09-24 | 1987-09-24 | Reproducing circuit of magnetic recording / reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6482303A true JPS6482303A (en) | 1989-03-28 |
| JP2664160B2 JP2664160B2 (en) | 1997-10-15 |
Family
ID=17010836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62237129A Expired - Lifetime JP2664160B2 (en) | 1987-09-24 | 1987-09-24 | Reproducing circuit of magnetic recording / reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2664160B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993014493A1 (en) * | 1992-01-10 | 1993-07-22 | Fujitsu Limited | Circuit for equalizing waveform of signal reproduced by thin film magnetic head |
| EP1126398A2 (en) * | 2000-01-24 | 2001-08-22 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Magnetic card reader and reproduction and demodulation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5619509A (en) * | 1979-07-23 | 1981-02-24 | Fujitsu Ltd | Automatic adjusting system for delay equalizer |
| JPS6079566A (en) * | 1983-09-30 | 1985-05-07 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Automatic amplitude equalizer |
| JPS61229205A (en) * | 1985-04-03 | 1986-10-13 | Hitachi Ltd | Magnetic recording and reproducing device |
-
1987
- 1987-09-24 JP JP62237129A patent/JP2664160B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5619509A (en) * | 1979-07-23 | 1981-02-24 | Fujitsu Ltd | Automatic adjusting system for delay equalizer |
| JPS6079566A (en) * | 1983-09-30 | 1985-05-07 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Automatic amplitude equalizer |
| JPS61229205A (en) * | 1985-04-03 | 1986-10-13 | Hitachi Ltd | Magnetic recording and reproducing device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993014493A1 (en) * | 1992-01-10 | 1993-07-22 | Fujitsu Limited | Circuit for equalizing waveform of signal reproduced by thin film magnetic head |
| US5440434A (en) * | 1992-01-10 | 1995-08-08 | Fujitsu Limited | Reproduced waveform equilizing circuit for thin-film magnetic head |
| EP1126398A2 (en) * | 2000-01-24 | 2001-08-22 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Magnetic card reader and reproduction and demodulation method |
| US6570723B2 (en) | 2000-01-24 | 2003-05-27 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Magnetic card reader and magnetic data reproduction method, data demodulation method and demodulator of magnetic record data |
| US6570722B2 (en) | 2000-01-24 | 2003-05-27 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Magnetic card reader and magnetic data reproduction method using signal peak point intervals |
| US6781776B2 (en) | 2000-01-24 | 2004-08-24 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Magnetic card reader and magnetic data reproduction method using signal peak point intervals |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2664160B2 (en) | 1997-10-15 |
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