JPS5812116A - Reading circuit of magnetic storage device - Google Patents
Reading circuit of magnetic storage deviceInfo
- Publication number
- JPS5812116A JPS5812116A JP10844881A JP10844881A JPS5812116A JP S5812116 A JPS5812116 A JP S5812116A JP 10844881 A JP10844881 A JP 10844881A JP 10844881 A JP10844881 A JP 10844881A JP S5812116 A JPS5812116 A JP S5812116A
- Authority
- JP
- Japan
- Prior art keywords
- head
- writing
- reading
- circuit
- write
- 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
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Digital Magnetic Recording (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、ディジタル磁気記憶装置における読出し回路
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a read circuit in a digital magnetic storage device.
磁気テープ装置などの磁気記憶装置では書込みヘッドと
読出しヘッドを有し、書込みヘッドによる情報の書込み
と同時に続出しヘッドで、これを読出して、記録媒体に
正しく書込まれたことをチェックする方式が用−られて
いる。この方式はチェックの同時性の必要から書込みヘ
ッドと読出しヘッドは接近して実装され通常一つのケー
ス内に両ヘッドが収容されている。それ故書込み時には
書込みへ、ド磁束の一部が読出しヘッドに回シ込み、こ
の回り込んだ磁束が記録媒体からの続出し信号に重畳し
、鳴止を劣化させる。この読出しヘッドに現われる不要
な書込み磁束は一般にクロスフィード雑音と呼ばれてお
り読出しマージンを決定する大きな要因となっていた。A magnetic storage device such as a magnetic tape device has a write head and a read head, and at the same time the write head writes information, a continuous read head reads the information to check that it has been correctly written to the recording medium. It is used. In this system, the write head and the read head are mounted close to each other because of the need for simultaneous checking, and both heads are usually housed in one case. Therefore, at the time of writing, a part of the write magnetic flux is routed to the read head, and this wrapped magnetic flux is superimposed on the continuous output signal from the recording medium, thereby deteriorating the stopping of the sound. This unnecessary write magnetic flux appearing in the read head is generally called cross-feed noise, and has been a major factor in determining the read margin.
このクロスフィード雑音を低減するため従来より磁気へ
、ドの磁気シールドなどの磁気的な対策や電気回路で補
償する方法が提案されてきた。第１図は電気回路で補償
する方法の一例で、第２因はその出力波形を示す図であ
る。図から明らかなように書込みデータ（ａ）をコンデ
ンサ７、抵抗８かｂ成る微分回路６で微分し、その出力
（ｂ）で増幅器４の出力に現われるクロスフィード雑音
（Ｃ）を相殺すべく加算増幅器５で両者の加算を行う方
法がとられてきた。しかしこの方法では加算後の波形（
ｅ）（第２図）に見られるように書込み電流の立上り特
性、読出しへ、ドの伝達特性などに起因した波形の不一
致、時間的なズレのため高周波での相殺効果が得られず
、特に書込み周波数が高くなる程クロスフィード雑音の
低減効果が減少する問題があった。In order to reduce this cross-feed noise, methods of compensation using magnetic countermeasures such as magnetic shielding or electric circuits have been proposed. FIG. 1 is an example of a method of compensating with an electric circuit, and the second factor is a diagram showing the output waveform. As is clear from the figure, the write data (a) is differentiated by a differentiating circuit 6 consisting of a capacitor 7 and a resistor 8 or b, and the output (b) is added to cancel the crossfeed noise (C) appearing at the output of the amplifier 4. A method has been adopted in which the amplifier 5 adds the two. However, with this method, the waveform after addition (
e) As seen in Figure 2, due to the waveform mismatch and time lag caused by the rise characteristics of the write current, the read and write current transfer characteristics, etc., it is not possible to obtain a cancellation effect at high frequencies. There has been a problem in that the higher the writing frequency is, the less the cross-feed noise reduction effect is.
本発明の目的はりｐスフイード雑音を回路で補償する方
法において上記問題点を解決し、高い書込み周波数まで
十分低減効果のある読出し回路を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in a method of compensating for p-wavelength noise using a circuit, and to provide a readout circuit that has a sufficient reduction effect even at high write frequencies.
前記目的を達成するために本発明による続出し回路は書
込みヘッドと読出しヘッドを有する磁気記憶装置の読出
し回路において前記書込みへ、ドの端子電圧を前記続出
しヘッドの伝達特性と等価なローパスフィルタを通した
後、読出しへ、ドからの続出し信号に加算するように構
成しである。In order to achieve the above object, the serialization circuit according to the present invention provides a readout circuit of a magnetic storage device having a write head and a read head. After passing through, the configuration is such that it is added to the subsequent output signal from the readout signal.
１記構成によればクロスフィード雑音を低減でき本発明
の目的は完全に達成される。According to configuration 1, cross-feed noise can be reduced and the object of the present invention can be completely achieved.
以下、図面により本発明をさらに詳しく説明する。第３
図は本発明回路の一実施例を示すプロ、り図である。９
は書込み電流駆動回路、１０は書込みヘッド、１ｌＦｉ
読出しへ、ド、１２ハ増幅器、１３社加算増幅器、１４
ハ読出しデータ整形回路、１５１！ローパスフイルタを
示している。Hereinafter, the present invention will be explained in more detail with reference to the drawings. Third
The figure is a diagram showing an embodiment of the circuit of the present invention. 9
is a write current drive circuit, 10 is a write head, 1lFi
To readout, C, 12 C amplifier, 13 company summing amplifier, 14
c Read data shaping circuit, 151! Showing a low pass filter.
ローパスフィルタ１５ハ読出しへ、ドの伝達特性と等価
なフィルタでコイル１６、コンデンサ１７、抵抗１８で
構成されている。The low-pass filter 15 is a filter having transfer characteristics equivalent to that of the low-pass filter 15 and 15, and is composed of a coil 16, a capacitor 17, and a resistor 18.
第４図はクロスフィード雑音の低減効果を示す波形図で
（ｆ）〜（ｋ） Ｆｉ第３図における（ｆ）〜（ｋ）Ｋ
対応する。情報の書込み読出しの動作では、書込みデー
タ（ｆ）が書込み駆動回路９で書込み電流（ｇ）に変換
され、書込みへ、ド１０により記録媒体を磁化する。ま
た読出しヘッドでこの磁化の変化を再生し、増幅器１２
、１３で増幅した後、読出しデータ整形回路１４で読
出しデータの弁別が行なわれる。Figure 4 is a waveform diagram showing the effect of reducing cross-feed noise.
handle. In the operation of writing and reading information, the write data (f) is converted into a write current (g) by the write drive circuit 9, and the recording medium is magnetized by the drive 10 for writing. The read head also reproduces this change in magnetization, and the amplifier 12
, 13, the read data is discriminated by a read data shaping circuit 14.
クロスフィード雑音は書込み電流（ｇ）が書込みへ、ド
１０で磁束に変換され、これが読出しヘッド１１に回り
込むために発生し、磁束の微分値が読出しヘッド１１の
伝達特性の影響を受け、増幅器１２の出力で（Ｈの波形
となって読出さ蜆４゜一方、書込みヘッドの端子電圧（
ｈ） ｉｊ書込み電流（ｇ）の微分値で、磁束の微分値
と等価であるため、これを読出しへ、ドの伝達特性と等
価なローパスフィルタ１５を通して０）の出力が得られ
る。出力（ｉ） ＄１クロスフィード雑音（ｊ）と逆位
相の同一波形のため、加算増幅器１３で両者を加算する
ことにより出力（ｋ）ではクロスフィード雑音は相殺さ
れてほとんど消滅する。Cross-feed noise occurs because the write current (g) is converted into magnetic flux at the write terminal 10, which wraps around the read head 11, and the differential value of the magnetic flux is affected by the transfer characteristics of the read head 11, and the amplifier 12 On the other hand, the terminal voltage of the write head (
h) ij This is the differential value of the write current (g) and is equivalent to the differential value of the magnetic flux, so when it is read out, an output of 0) is obtained through the low-pass filter 15 which has an equivalent transfer characteristic. Since the output (i) has the same waveform with an opposite phase to the $1 crossfeed noise (j), by adding both in the summing amplifier 13, the crossfeed noise is canceled out and almost disappears at the output (k).
第５因に読出しヘッドの等価回路の図を示す。As the fifth factor, a diagram of an equivalent circuit of the read head is shown.
ローパスフィルタ１５Ｆｉこの回路を基本にした２極フ
イルタ構成である。なお、第５図中の１９゜２０、２１
．２２ハそれぞれ抵抗分、自己インダクタンス、浮遊容
量、負荷抵抗を示して−る。Low-pass filter 15Fi has a two-pole filter configuration based on this circuit. In addition, 19°20, 21 in Figure 5
．． 22 shows resistance, self-inductance, stray capacitance, and load resistance, respectively.
本発明は以上説明したように、書込みヘッドの端子電圧
を読出しヘッドの伝達特性と等価なローパスフィルタを
通した後、続出しヘッドからの続出し信号に加算するこ
とＫより、従来よりクロスフィード雑音を著しく低減し
、続出しマージンを向上させる効果がある。As explained above, the present invention is characterized in that the terminal voltage of the write head is passed through a low-pass filter equivalent to the transfer characteristic of the read head and then added to the continuous output signal from the continuous output head. This has the effect of significantly reducing the number of outputs and improving the successive output margin.
第１図は従来の読出し回路のブロック図、第２図は第１
図の各回路部の出力波形図、第３図は本発明による読出
し回路の一実施例を示すブロック図、第４図は第３図の
各回路部の出力波形図、第５図は続出しヘッドの等価回
路図である。
１ 、９−・・書込み駆動回路
２．１０−一書込みヘッド ３，１１・・・読出しへ、
ド４ 、１２−−・増幅器 ５ 、１３−・・加算増
幅器６・・・微分回路 １４−・・読出しデータ整形回
路１５−ローパスフィルタ
特許出願人 日本電気株式会社
代理人 弁理士 井 ノ ロ 壽Figure 1 is a block diagram of a conventional readout circuit, and Figure 2 is a block diagram of a conventional readout circuit.
3 is a block diagram showing an embodiment of the readout circuit according to the present invention, FIG. 4 is an output waveform diagram of each circuit section in FIG. 3, and FIG. 5 is a continuation FIG. 3 is an equivalent circuit diagram of the head. 1, 9--write drive circuit 2.10-1 write head 3, 11--to read;
4, 12--Amplifier 5, 13--Summing amplifier 6-Differentiating circuit 14--Reading data shaping circuit 15-Low pass filter Patent applicant NEC Corporation Representative Patent attorney Hisashi Inoro
Claims (1)
出し回路において、前記書込みへ。 ドの端子電圧を１記続出しヘッドの伝達特性と等価なロ
ーパスフィルタを通した後、読出しヘッドからの読出し
信号に加算するように構成したことを特徴とする磁気記
憶装置の続出し回路。Claims: A read circuit for a magnetic storage device having a write head and a continuous head. 1. A readout circuit for a magnetic storage device, characterized in that the terminal voltage of a write readout head is passed through a low-pass filter equivalent to the transfer characteristic of a readout head, and then added to a readout signal from a readout head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10844881A JPS5812116A (en) | 1981-07-10 | 1981-07-10 | Reading circuit of magnetic storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10844881A JPS5812116A (en) | 1981-07-10 | 1981-07-10 | Reading circuit of magnetic storage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5812116A true JPS5812116A (en) | 1983-01-24 |
Family
ID=14485034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10844881A Pending JPS5812116A (en) | 1981-07-10 | 1981-07-10 | Reading circuit of magnetic storage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5812116A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7315428B2 (en) * | 2004-10-28 | 2008-01-01 | Hewlett-Packard Development Company, L.P. | Magnetic media write signal filter |
-
1981
- 1981-07-10 JP JP10844881A patent/JPS5812116A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7315428B2 (en) * | 2004-10-28 | 2008-01-01 | Hewlett-Packard Development Company, L.P. | Magnetic media write signal filter |
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