JPH041405B2 - - Google Patents
Info
- Publication number
- JPH041405B2 JPH041405B2 JP3797780A JP3797780A JPH041405B2 JP H041405 B2 JPH041405 B2 JP H041405B2 JP 3797780 A JP3797780 A JP 3797780A JP 3797780 A JP3797780 A JP 3797780A JP H041405 B2 JPH041405 B2 JP H041405B2
- Authority
- JP
- Japan
- Prior art keywords
- signals
- signal
- difference
- magnetic disk
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
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
- G11B5/09—Digital recording
-
- 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
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Digital Magnetic Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Dc Digital Transmission (AREA)
Description
【発明の詳細な説明】
本発明は磁気デイスク装置等の磁気記録情報の
再生方式にかかる。従来、磁気デイスク装置の磁
気記録情報の再生方式は、磁気デイスクの記録情
報を磁気ヘツドにより180゜位相差の２信号をその
まま増巾、微分、低域波、パルス化しているた
めに、記録密度が増大するに従つて信号対雑音比
（SNR）が劣化して情報の再生の信頼性を下げて
いた。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reproducing magnetically recorded information in a magnetic disk device or the like. Conventionally, the method for reproducing magnetically recorded information in magnetic disk devices uses a magnetic head to directly amplify, differentiate, low-frequency, and pulse two signals with a 180° phase difference from the information recorded on the magnetic disk. As the amount of data increases, the signal-to-noise ratio (SNR) deteriorates, reducing the reliability of information reproduction.
本発明の目的は上述のSNR劣化を除去し高記
録密度時における磁気デイスク装置のSNRを増
大させる磁気記録情報の再生方式を提供すること
にある。 An object of the present invention is to provide a method for reproducing magnetically recorded information that eliminates the above-mentioned SNR deterioration and increases the SNR of a magnetic disk device at high recording density.
本発明は、磁気デイスクの記録情報を磁気ヘツ
ドにより再生した180゜位相差の信号を増巾した後
（以下信号Ａ、信号Ｂとする）、それらの信号の差
信号Ａ−Ｂ，Ｂ−Ａを作成し、その差信号Ａ−
Ｂ，Ｂ−Ａをそれぞれ微分、低域波、パルス化
することを特徴とする磁気記録情報の再生方式で
ある。 In the present invention, after amplifying a signal with a 180° phase difference obtained by reproducing information recorded on a magnetic disk by a magnetic head (hereinafter referred to as signal A and signal B), difference signals A-B and B-A of these signals are generated. and the difference signal A-
This is a method for reproducing magnetically recorded information, which is characterized by differentiating B and B-A, converting them into low-frequency waves, and pulsing them, respectively.
本発明によれば、再生信号振巾Ｓは２倍とな
り、雑音は同相分は除去され、逆相分は２倍とな
るので全体の雑音量は変化せず、SNRは２倍と
なり、再生信号データの信頼性は増大する。 According to the present invention, the reproduced signal amplitude S is doubled, the in-phase noise is removed, and the anti-phase noise is doubled, so the overall amount of noise does not change, the SNR is doubled, and the reproduced signal Data reliability increases.
この磁気記録情報の再生方式は高記録密度にお
いてSNRが小さい時に特に有効な方式である。 This method of reproducing magnetically recorded information is particularly effective when the SNR is small at high recording density.
次に本発明による磁気再生方式を実施例により
詳細に説明する。 Next, the magnetic reproducing system according to the present invention will be explained in detail using examples.
第１図は磁気デイスク装置に適用した場合の本
発明の一実施例を示す回路構成図で、磁気デイス
クに記録された情報を再生する磁気ヘツド１と、
磁気ヘツド１により再生された信号を増巾する再
生増巾器２と、再生増幅された180゜位相差の２信
号の差信号Ａ−Ｂ，Ｂ−Ａを作成する差信号作成
回路３および４と、差信号作成回路の出力信号を
微分する微分回路５と、微分回路５の出力信号を
低域波する低域波器６と、その低域波器６
の出力をパルス化する比較器７と、比較器７によ
りパルス化された信号から記憶情報を弁別する弁
別回路８とにより構成され、その弁別回路８の出
力は直並列変換部へと送られる。 FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention when applied to a magnetic disk device, in which a magnetic head 1 for reproducing information recorded on a magnetic disk,
A regenerative amplifier 2 that amplifies the signal reproduced by the magnetic head 1, and difference signal generating circuits 3 and 4 that generate difference signals A-B and B-A between the two regeneratively amplified signals with a 180° phase difference. , a differentiating circuit 5 for differentiating the output signal of the difference signal generating circuit, a low frequency converter 6 for converting the output signal of the differentiating circuit 5 into a low frequency band, and the low frequency converter 6
It is comprised of a comparator 7 that pulses the output of the comparator 7, and a discrimination circuit 8 that discriminates stored information from the signal pulsed by the comparator 7, and the output of the discrimination circuit 8 is sent to a serial/parallel converter.
このような構成により再生信号のSNRを6dB
上昇することができ、磁気デイスク装置の再生デ
ータの信頼性が向上する。 This configuration reduces the SNR of the reproduced signal by 6dB.
This improves the reliability of data reproduced by the magnetic disk device.
次に第２図を参照して、第１図に示した実施例
の動作を、磁気デイスク上にMFM方式により記
憶された最悪記録状態のデータ“1010110101”を
再生する場合について説明する。 Next, referring to FIG. 2, the operation of the embodiment shown in FIG. 1 will be described for the case where data "1010110101" in the worst recorded state stored on a magnetic disk by the MFM method is reproduced.
データ“1010110101”の磁気デイスク上での磁
化は第２図の磁化Ａのようになつている。この磁
化Ａを磁気ヘツド１により再生した再生信号を信
号１０１，１０２とする。再生信号１０１と１０
２はお互いに180゜位相が異なつている。再生増幅
器２により再生信号１０１，１０２を増幅し、そ
の出力信号がそれぞれ信号１０３（振幅Ａ）、１
０４（振幅Ｂ）となる。信号１０３と信号１０４
により差信号Ａ−Ｂ，Ｂ−Ａを作成するために差
信号作成回路３，４へそれぞれ入力し、その出力
信号（差信号）１０５および１０６を得る。信号
１０５および１０６はピーク位置を検出するため
に微分回路５に入力し、その出力信号１０７，１
０８をさらに低域波器６に入力し、その差動出
力信号１０９および１１０を比較器７に入力し、
デイジタル化する。その比較の出力パルス１１１
を弁別回路８に入力し、その出力としてデータ
“1010110101”の“１”の位置のパルスを発生す
る直列パルス列１１２を得て、その信号１１２を
直並列変換回路へと送る。このように差信号作成
回路３，４を用いて差信号Ａ−Ｂ，Ｂ−Ａを作成
することにより、再生信号Ｓは２倍となり、ノイ
ズ分は同相分と逆相分が50％づつとすれば、同相
分は０となり、逆相分は２倍となるため、全体の
ノイズＮとしては変化せず、結局SNRは6dBだ
け上昇できることになる。 The magnetization of the data "1010110101" on the magnetic disk is as shown in magnetization A in FIG. Reproduction signals obtained by reproducing this magnetization A by the magnetic head 1 are designated as signals 101 and 102. Playback signals 101 and 10
2 have a phase difference of 180° from each other. The regenerative amplifier 2 amplifies the regenerated signals 101 and 102, and the output signals become signals 103 (amplitude A) and 1, respectively.
04 (amplitude B). Signal 103 and signal 104
In order to create difference signals AB and BA, the signals are input to difference signal creation circuits 3 and 4, respectively, and output signals (difference signals) 105 and 106 are obtained. The signals 105 and 106 are input to the differentiating circuit 5 to detect the peak position, and the output signals 107, 1
08 is further input to the low frequency converter 6, and its differential output signals 109 and 110 are input to the comparator 7,
Digitize. The output pulse 111 of the comparison
is input to the discrimination circuit 8, and as its output, a serial pulse train 112 that generates a pulse at the "1" position of the data "1010110101" is obtained, and the signal 112 is sent to the serial/parallel conversion circuit. By creating the difference signals A-B and B-A using the difference signal creation circuits 3 and 4 in this way, the reproduced signal S is doubled, and the noise component is made up of 50% each of in-phase and anti-phase components. Then, the in-phase component becomes 0 and the negative-phase component becomes twice as large, so the overall noise N does not change and the SNR can be increased by 6 dB after all.
本発明は実施例に示されたように、増巾器２と
微分回路５の間に差信号作成回路３，４を挿入す
る場合のみでなく、微分回路５と低域波器６と
の間または低域波器６と比較器８の間に差信号
作成回路３，４を挿入した場合も適用できること
は言うまでもない。 As shown in the embodiments, the present invention is applicable not only to the case where the difference signal generating circuits 3 and 4 are inserted between the amplifier 2 and the differentiator 5, but also to the case where the difference signal generating circuits 3 and 4 are inserted between the differentiator 5 and the low frequency converter 6. It goes without saying that the present invention can also be applied to a case where the difference signal generating circuits 3 and 4 are inserted between the low frequency converter 6 and the comparator 8.
本発明を使用すれば、磁気デイスク装置の再生
信号のSNRを6dBだけ改善することができるた
めに、磁気デイスク装置の信頼性を大幅に増大す
ることができる。 By using the present invention, the SNR of the reproduced signal of the magnetic disk device can be improved by 6 dB, so the reliability of the magnetic disk device can be significantly increased.
第１図は本発明の一実施例を示す回路構成図、
第２図は第１図の各部分の信号波形を示す図であ
る。
１は磁気ヘツド、２は再生増幅器、３および４
は差信号作成回路、５は微分回路、６は低域波
器、７は比較器、８は弁別回路をそれぞれ示す。
FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention;
FIG. 2 is a diagram showing signal waveforms of each portion of FIG. 1. 1 is a magnetic head, 2 is a regenerative amplifier, 3 and 4
Reference numeral 5 indicates a difference signal generation circuit, 5 a differentiation circuit, 6 a low-frequency wave generator, 7 a comparator, and 8 a discrimination circuit, respectively.
Claims (1)
再生した180゜位相差を有する２信号（Ａ，Ｂとす
る）を増幅する再生増幅器と、該再生増幅器の出
力の２信号より差信号Ａ−Ｂ，Ｂ−Ａを作成する
差信号作成手段と、該差信号作成手段の出力信号
を微分し、低域濾波し、パルス化する処理回路と
を備えたことを特徴とする磁気記録情報の再生方
式。1. A reproducing amplifier that amplifies two signals (referred to as A and B) having a 180° phase difference obtained by reproducing information recorded on a magnetic disk by a magnetic head, and a difference signal A-B, B from the two signals output from the reproducing amplifier. -A, and a processing circuit that differentiates, low-pass filters, and pulses the output signal of the difference signal generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3797780A JPS56134307A (en) | 1980-03-25 | 1980-03-25 | Reproduction system of magnetic recording information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3797780A JPS56134307A (en) | 1980-03-25 | 1980-03-25 | Reproduction system of magnetic recording information |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56134307A JPS56134307A (en) | 1981-10-21 |
| JPH041405B2 true JPH041405B2 (en) | 1992-01-13 |
Family
ID=12512620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3797780A Granted JPS56134307A (en) | 1980-03-25 | 1980-03-25 | Reproduction system of magnetic recording information |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56134307A (en) |
-
1980
- 1980-03-25 JP JP3797780A patent/JPS56134307A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56134307A (en) | 1981-10-21 |
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