JPH0212763U - - Google Patents
Info
- Publication number
- JPH0212763U JPH0212763U JP8716488U JP8716488U JPH0212763U JP H0212763 U JPH0212763 U JP H0212763U JP 8716488 U JP8716488 U JP 8716488U JP 8716488 U JP8716488 U JP 8716488U JP H0212763 U JPH0212763 U JP H0212763U
- Authority
- JP
- Japan
- Prior art keywords
- detected
- circuit
- data
- reading
- output period
- 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
- 230000002159 abnormal effect Effects 0.000 claims 2
- 230000001934 delay Effects 0.000 claims 1
- 230000003111 delayed effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Description
第１図は本考案によるウインドマージン判定装
置の実施例を示すブロツク図、第２図はデータと
ウインドの関係を示す波形図、第３図は本考案に
よるウインドマージン判定装置の動作を説明する
ための波形図、第４図は従来の測定方式を説明す
るための波形図である。
１……リード／ライトヘツド、２……読取再生
回路、３……判定回路、４……同期信号回路、５
……ウインドシフト回路、６……ウインド幅生成
回路、７……シフト時間生成回路。
FIG. 1 is a block diagram showing an embodiment of the wind margin determining device according to the present invention, FIG. 2 is a waveform diagram showing the relationship between data and the window, and FIG. 3 is a diagram for explaining the operation of the wind margin determining device according to the present invention. FIG. 4 is a waveform diagram for explaining the conventional measurement method. DESCRIPTION OF SYMBOLS 1... Read/write head, 2... Reading and reproducing circuit, 3... Judgment circuit, 4... Synchronization signal circuit, 5
...wind shift circuit, 6...window width generation circuit, 7...shift time generation circuit.
Claims (1)
トするヘツドと、前記ヘツドにより読取つたデー
タを再生する読取再生回路と、所定のウインド幅
を生成するウインド幅生成回路と、遅延させたり
、進ませたりする時間を生成するシフト時間生成
回路と、前記シフト時間生成回路によつて生成さ
れた時間にしたがつて前記ウインド幅生成回路か
らのウインドを進行させるか、遅延させるウイン
ドシフト回路と、前記ウインドシフト回路から与
えられた出力期間に前記読取再生回路からデータ
が検出されないときは、異常ビツト検出と判定し
、前記出力期間に前記データが検出されたときは
正常ビツト検出であると判定する判定回路とから
構成したことを特徴とするウインドマージン判定
装置。 出力期間に前記読取再生回路からデータが検出
されないときは、異常ビツト検出と判定し、前記
出力期間に前記データが検出されたときは正常ビ
ツト検出であると判定する判定回路とから構成し
たことを特徴とするウインドマージン判定装置。[Claims for Utility Model Registration] A head for reading/writing data on a floppy disk, a reading/reproducing circuit for reproducing the data read by the head, and a window width generation circuit for generating a predetermined window width. a shift time generation circuit that generates a time to be delayed or advanced; and a window that advances or delays the window from the window width generation circuit according to the time generated by the shift time generation circuit. When no data is detected from the reading and reproducing circuit during the output period given by the shift circuit and the wind shift circuit, it is determined that an abnormal bit has been detected, and when the data is detected during the output period, it is determined that a normal bit has been detected. 1. A wind margin determination device comprising a determination circuit that determines that there is a wind margin. and a determination circuit that determines that an abnormal bit has been detected when data is not detected from the reading and reproducing circuit during the output period, and determines that a normal bit has been detected when the data is detected during the output period. Characteristic wind margin determination device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8716488U JPH0212763U (en) | 1988-06-30 | 1988-06-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8716488U JPH0212763U (en) | 1988-06-30 | 1988-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0212763U true JPH0212763U (en) | 1990-01-26 |
Family
ID=31311786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8716488U Pending JPH0212763U (en) | 1988-06-30 | 1988-06-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0212763U (en) |
-
1988
- 1988-06-30 JP JP8716488U patent/JPH0212763U/ja active Pending
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