JPS59198514A - Magnetic disc device - Google Patents
Magnetic disc deviceInfo
- Publication number
- JPS59198514A JPS59198514A JP7286483A JP7286483A JPS59198514A JP S59198514 A JPS59198514 A JP S59198514A JP 7286483 A JP7286483 A JP 7286483A JP 7286483 A JP7286483 A JP 7286483A JP S59198514 A JPS59198514 A JP S59198514A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- magnetic head
- recording
- magnetic
- reproducing
- 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)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、磁気ディスク装置の記録再生回路に係り、特
に磁気ヘッド、磁気ディスクの記録再生特性のばらつき
を吸収し、読出余裕向上に好適な記録再生回路に関する
。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a recording/reproducing circuit for a magnetic disk device, and in particular to a recording/reproducing circuit suitable for absorbing variations in the recording/reproducing characteristics of a magnetic head and a magnetic disk and improving read margin. Regarding reproduction circuits.
一般に磁気ディスク装置における記録再生回路は、それ
に使用している磁気１ヘツド、磁気デ・ｆスフの特性、
記録周波数、及び記録密度等に合せて最適な周波数特性
で設計される。この記録再生回路の周波数特性は、当然
ながら磁気ヘッド、磁気ディスクによって左右されるも
ので、従来磁気ヘッド及び磁気ディスク自体の特性の違
い、さらには磁気ヘッドの位置する磁気ディスクのトラ
ック位置に応じた磁気記録密度の違い、周速の違い、並
びに磁気ヘッドの浮上量の違いに起因する再生波形のば
らつきが生じている。記録密度のあまり大きくない従来
の記録再生回路においては、その回路定数は固定型のも
のを１史用していた。In general, the recording/reproducing circuit in a magnetic disk device depends on the characteristics of the magnetic head and magnetic disk used therein.
It is designed with optimal frequency characteristics according to recording frequency, recording density, etc. The frequency characteristics of this recording/reproducing circuit naturally depend on the magnetic head and magnetic disk. Conventionally, the frequency characteristics of the magnetic head and the magnetic disk themselves are different, and the frequency characteristics of the magnetic disk are also affected by the track position of the magnetic disk where the magnetic head is located. Variations in reproduced waveforms occur due to differences in magnetic recording density, peripheral speed, and flying height of the magnetic head. In conventional recording/reproducing circuits whose recording density is not very high, fixed circuit constants have been used for a long time.
しかし、近年磁気ディスク装置の大容蓋化、高速化に伴
う記録密度の増大につれて前記再生波形のばらつきは、
装置の記録再生動作余裕を低下させる大きな要因となっ
ており、再生波形のばらつきを補正する必要が増大して
いる。However, in recent years, as magnetic disk drives have become larger and their recording densities have increased due to faster speeds, the variations in the reproduced waveforms have increased.
This is a major factor in reducing the recording/reproducing operation margin of the device, and there is an increasing need to correct variations in reproduced waveforms.
本発明の目的は、磁気ヘッド、磁気ディスクの租合せに
よる再生波形のばらつきを補正し、装置の位相学裕を増
大させた磁気ディスク装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk device in which variations in reproduced waveforms due to alignment of a magnetic head and a magnetic disk are corrected, and the topological margin of the device is increased.
本発明によれば、磁気ヘッド、磁気ディスク単位毎に余
弦等化回路、微分回路、低域ｐ波器のうち、１個または
複数個の回路定数を切替え、記録再生回路の周波数特性
を変えることができるので磁気ヘッド、磁気ディスクの
組合せによる再生波形のばらつきが補正でき、装置の位
相余裕を増大することが可能である。According to the present invention, the frequency characteristics of the recording/reproducing circuit can be changed by switching the circuit constants of one or more of the cosine equalization circuit, the differentiating circuit, and the low-frequency p wave generator for each magnetic head and magnetic disk. Therefore, variations in the reproduced waveform due to the combination of the magnetic head and the magnetic disk can be corrected, and the phase margin of the device can be increased.
以下、本発明の一実施例を稟１図により説明する。 Hereinafter, one embodiment of the present invention will be described with reference to Figure 1.
第１図は、本発明を適用した磁気ディスク装置の記録再
生回路例で、自動利得制御回路１、余弦等化回路２、微
分回路３、低域沖波器４，５、ピークセンス回路６、及
び本発明の特徴である磁気゛ヘッド特性情報信号ｐ等か
らなる。FIG. 1 shows an example of a recording/reproducing circuit of a magnetic disk device to which the present invention is applied, which includes an automatic gain control circuit 1, a cosine equalization circuit 2, a differentiator circuit 3, low-frequency transducers 4 and 5, a peak sense circuit 6, and It consists of a magnetic head characteristic information signal p, which is a feature of the present invention.
磁気ヘッド特性情報信号ｐは、磁気ヘッド個別に予め設
定された最適な周波数特性、すなわち回路定数となるよ
うな情報を与える信号で、固定記録媒体（ＨＤ Ａ ：
Ｈｅａｄ Ｄｉｓｋ Ａｓｓｅｍｂｌｙ）方式であれ
ば第２図に示すように外部記録再生回路とのインタフェ
ース回路部に予めその情報が記録されており、磁気ヘッ
ド選択信号すにより得られる。The magnetic head characteristic information signal p is a signal that gives information such as the optimal frequency characteristic, that is, the circuit constant, set in advance for each magnetic head, and is a signal that provides information such as the optimum frequency characteristic set in advance for each magnetic head, that is, the circuit constant.
In the case of the Head Disk Assembly (Head Disk Assembly) method, as shown in FIG. 2, the information is recorded in advance in an interface circuit section with an external recording/reproducing circuit, and can be obtained by a magnetic head selection signal.
今、余弦等化回路を例にとると、第３図に示すように、
磁気ヘッド特性情報信号ｐにより、余弦等化回路の減衰
量を変化することによって、余弦等化回路の該ヘッド最
適周波数特性を与え、再生波形を良好にすることが可能
である。Now, taking the cosine equalization circuit as an example, as shown in Figure 3,
By changing the amount of attenuation of the cosine equalization circuit using the magnetic head characteristic information signal p, it is possible to provide the cosine equalization circuit with the optimum frequency characteristics of the head and improve the reproduced waveform.
他の微分回路、低域ろ波器についても、磁気ヘッド特性
情報信号ｐによって同様に回路定数を最適化することが
でき、所望の再生波形を得ることが可能である。Regarding other differentiating circuits and low-pass filters, the circuit constants can be similarly optimized using the magnetic head characteristic information signal p, and it is possible to obtain a desired reproduced waveform.
本発明によれば、磁気ヘッド特性情報信号により、記録
再生回路の周波数特性を変えることができるので、磁気
ヘッド、磁気ディスクの組合せによる再生波形のばらつ
きが補正でき、装置の再生動作の際の位相余裕が増大す
る効果がある。According to the present invention, since the frequency characteristics of the recording/reproducing circuit can be changed using the magnetic head characteristic information signal, variations in the reproduction waveform due to the combination of the magnetic head and the magnetic disk can be corrected, and the phase during the reproduction operation of the device can be corrected. This has the effect of increasing margin.
第１図は、本発明の記録再生回路のブロック図第２図は
、磁気ヘッド特性情報信号を得る方法を示す図、第３図
は、第１図の波形等化回路部分の詳細説明図である。
符号の説明
１°・・自動利得制御回路 ２・・・波形等化回路３・
・・微分回路 ４，５・・・低域Ｆ波器６・・
・ピークセンス回路
７ ・ＨＤ Ａ （Ｈｅａｄ Ｄｉｓｋ Ａｓｓｅｍｂ
ｌｙ ）８・・・磁気ディスク ９・・・磁気ヘッ
ド１０・・・）ＩＤＡインタフェース回路部１１・・・
ヘッド選択回路 １２・・・遅“延線１３・・・差動
増幅器 １４・・・スイッチ代理人弁理士 高
倫 明 夫
第 １目
第３虐FIG. 1 is a block diagram of the recording/reproducing circuit of the present invention. FIG. 2 is a diagram showing a method for obtaining a magnetic head characteristic information signal. FIG. 3 is a detailed explanatory diagram of the waveform equalization circuit portion of FIG. 1. be. Explanation of symbols 1°... Automatic gain control circuit 2... Waveform equalization circuit 3.
...Differentiating circuit 4,5...Low frequency F wave unit 6...
・Peak sense circuit 7 ・HD A (Head Disk Assembly
ly) 8...Magnetic disk 9...Magnetic head 10...) IDA interface circuit section 11...
Head selection circuit 12...Delay line 13...Differential amplifier 14...Switch agent patent attorney High
Michi Akio No. 1, No. 3
Claims (1)
器からなる記録再生回路を用い、複数の磁気ヘッドのう
ち１個を選択し、記録再生する磁気ディスク装置におい
て、磁気ヘッド、磁気ディスク単位毎に余弦等化回路、
微分回路、低域ｒ波器のうち１個または複数個の回路定
数を切替えることを特徴とする磁気ディスク装置６In a magnetic disk device that selects one of a plurality of magnetic heads to perform recording and reproduction using a recording/reproducing circuit consisting of an automatic gain control circuit, a cosine equalization circuit, a differentiator, and a low-frequency F wave device, the magnetic head, magnetic Cosine equalization circuit for each disk unit,
A magnetic disk device 6 characterized in that the circuit constants of one or more of a differential circuit and a low-frequency r wave generator are switched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7286483A JPS59198514A (en) | 1983-04-27 | 1983-04-27 | Magnetic disc device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7286483A JPS59198514A (en) | 1983-04-27 | 1983-04-27 | Magnetic disc device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59198514A true JPS59198514A (en) | 1984-11-10 |
Family
ID=13501628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7286483A Pending JPS59198514A (en) | 1983-04-27 | 1983-04-27 | Magnetic disc device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59198514A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61156574A (en) * | 1984-12-27 | 1986-07-16 | Nec Corp | Write/read-out controlling circuit of magnetic disk driving device |
| JPS6240663A (en) * | 1985-08-15 | 1987-02-21 | Nec Corp | Disk device |
| US5638225A (en) * | 1992-03-18 | 1997-06-10 | Fujitsu Limited | Magnetic disc apparatus |
-
1983
- 1983-04-27 JP JP7286483A patent/JPS59198514A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61156574A (en) * | 1984-12-27 | 1986-07-16 | Nec Corp | Write/read-out controlling circuit of magnetic disk driving device |
| JPS6240663A (en) * | 1985-08-15 | 1987-02-21 | Nec Corp | Disk device |
| US5638225A (en) * | 1992-03-18 | 1997-06-10 | Fujitsu Limited | Magnetic disc apparatus |
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