JPS6032170A - Speed signal composing circuit - Google Patents

Speed signal composing circuit

Info

Publication number
JPS6032170A
JPS6032170A JP14201683A JP14201683A JPS6032170A JP S6032170 A JPS6032170 A JP S6032170A JP 14201683 A JP14201683 A JP 14201683A JP 14201683 A JP14201683 A JP 14201683A JP S6032170 A JPS6032170 A JP S6032170A
Authority
JP
Japan
Prior art keywords
speed
signal
speed signal
output
mixer
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
Application number
JP14201683A
Other languages
Japanese (ja)
Inventor
Yukimasa Sugimoto
杉本　行正
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP14201683A priority Critical patent/JPS6032170A/en
Publication of JPS6032170A publication Critical patent/JPS6032170A/en
Pending legal-status Critical Current

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
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G05D3/12—Control of position or direction using feedback
    • G05D3/14—Control of position or direction using feedback using an analogue comparing device
    • G05D3/1445—Control of position or direction using feedback using an analogue comparing device with a plurality of loops
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/41—Servomotor, servo controller till figures
    • G05B2219/41423—Noise filter as function of rate of displacement, speed, for stabilisation

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Moving Of Head For Track Selection And Changing (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

PURPOSE:To give the stable servo control to the seeking action speed of a movable head of a magnetic disk by composing a speed signal after a harmful mechanical vibration component is satisfactorily attenuated by means of a secondary LPF. CONSTITUTION:The speed detection signal of a disk movable head obtained by a head movable part 102 and a speed detecting circuit 103 is mixed with the output of a gain matching element 6 obtained on the basis of the detection current of a servo current detecting circuit 104 through a mixer 8. Then a high frequency component is deleted by the secondary LPF3 together with a harmful mechanical vibration component. The speed signal having a low S/N and passing through the LPF3 is mixed with a servo current detection signal passed through a gain matching element 7 and the secondary BPF4 through a mixer 9. As a result, a speed signal containing no harmful mechanical vibration component is composed with a good S/N. Thus it is possible to give the stable servo control to the seeking action speed of a movable head of a magnetic disk.

Description

【発明の詳細な説明】 本発明は磁気ディスク装置のヘッド位置決めサーボ機構
で使用する速度信号合成回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed signal synthesis circuit used in a head positioning servo mechanism of a magnetic disk device.

最近の磁気ディスク装置は、第１図に示すように、互い
に９０°位相のずれた２つの位置信号ｌおよび２ｔ−使
う２相サ一ボ方式全採用しており、これら２つの位置信
号ｌおよび２ｔ−微分した信号と、それらの反転信号と
の計４つの信号を１７４周期ずつ選択してつなぐ仁とに
より１つの連続した速度信号をつくっている。この位置
信号微分による速度信号は、微分演算に伴なう高域周波
数成分の増加と４信号の結合とにより、その゛まま可動
ヘッドのシーク動作の速度制御に用いるには、Ｓ／Ｎ（
信号・雑音比）が十分でない。そのため、サーヂモータ
の駆動電流を検出する電流検出信号を位置信号微分によ
る速度信号に加算して、１次ローパスフィルターに通し
８７Ｎ１．改善している。電流検出信号を加算するのは
速度信号の高域周波数成分がローパスフィルタで失われ
るのを補償するためである。As shown in Figure 1, recent magnetic disk drives have all adopted a two-phase sabot system that uses two position signals l and 2t that are 90 degrees out of phase with each other. One continuous speed signal is created by selecting and connecting a total of four signals, the 2t-differentiated signal and their inverted signals, every 174 cycles. The speed signal resulting from this position signal differentiation has an S/N ratio (S/N) of
signal/noise ratio) is not sufficient. Therefore, a current detection signal for detecting the drive current of the surge motor is added to a speed signal obtained by position signal differentiation, and the signal is passed through a first-order low-pass filter 87N1. It's improving. The reason for adding the current detection signal is to compensate for the loss of high frequency components of the speed signal in the low-pass filter.

すなわち、サーボモータの駆動電流２Ｉｏ、力定数ｔｌ
−に、、可動部の質量２Ｍとすると、加速度Ａ＃１Ａ＝
ｌｏＫ、／Ｍとなる。加速度Ａは速度Ｖの微分だから、
微分演算子２ＢとするとＡ、（Ｖである。また、１次ロ
ーパスフィルタのカットオフ周波数をｆｏ　とすると、
その特性は・１／（１−１／２πｆａ）と表わされる。That is, the drive current of the servo motor is 2Io, the force constant tl
-, if the mass of the moving part is 2M, acceleration A#1A=
loK, /M. Since acceleration A is the differential of velocity V,
If the differential operator 2B is A, (V. Also, if the cutoff frequency of the first-order low-pass filter is fo,
Its characteristic is expressed as 1/(1-1/2πfa).

駆動電流ｌｏをに、／２πｆ０Ｍ　倍して、Ｖに加える
と、前ｇｏノ関係Ｋ　Ｘ　り　ｖ十Ｉｏ　ＫＦ　／　２
　ｘ　ｆ　０Ｍ＝　ｖ＋Ａ／２　πｆ　０＝　Ｖ　（１
＋８／２πｆ、）となるから、これを伝達関数が１／（
１−＋−８／２πｆ、）である１次ローパスフィルタに
通すと、（１＋８／２πｆ。）が打ち消されて、速度■
が合成されることになる。これが従来の速度信号合成回
路である。If the drive current lo is multiplied by /2πf0M and added to V, the previous go relation K
x f 0M= v+A/2 πf 0= V (1
+8/2πf, ), so the transfer function is 1/(
When passed through a first-order low-pass filter with a value of 1−+−8/2πf,), (1+8/2πf.) is canceled and the speed ■
will be synthesized. This is a conventional speed signal synthesis circuit.

このような従来構成においては、Ｓ／Ｎはローパスフィ
ルタのカットオフ周波数ｆａヲ下げる程、改善されるが
、カットオフ周波数ｆ。を下げると、合成された速度信
号に占める電流検出信号成分がふえることになシ、可動
ヘッドが受ける風力、バネ、フレキシブルケーブルのた
わみ等からなる外力の影響で加速度Ａが正確には駆動電
流Ｉ。に比例しないため、精度は悪くなる。そこでカッ
トオフ周波数ｆ０　は普通数百Ｈｚに選んでいる。とこ
ろが位置信号を微分した場合に、ランダム雑音以外に本
来の速度ではないヘッドブロック等可動部の機械共振に
よる振動成分が位置信号に混入している。この機械振動
がｌ　ＫＨｚ〜２ＫＨｚである場合に、これまで説明し
た従来の速度信号合成回路ではローパスフィルタが１次
フィルタであるため、機械振動成分を充分に減衰させる
ことができず、そのためサーボループ特注が不安定にな
り、目標位置にヘッドを移動させるシーク動作時の動作
音が大きくなったり、場合によっては発伽して誤動作を
起したりするという欠点がある。In such a conventional configuration, the S/N is improved as the cutoff frequency fa of the low-pass filter is lowered, but the cutoff frequency f. If the current detection signal component is lowered, the current detection signal component that occupies the synthesized speed signal will increase.Accurately, the acceleration A will be reduced by the drive current I due to the influence of external forces such as the wind force, springs, and deflection of the flexible cable that the movable head receives. . Since it is not proportional to , accuracy deteriorates. Therefore, the cutoff frequency f0 is usually selected to be several hundred Hz. However, when the position signal is differentiated, in addition to random noise, vibration components due to mechanical resonance of movable parts such as the head block, which are not at the original speed, are mixed into the position signal. When this mechanical vibration is between 1 KHz and 2 KHz, the conventional speed signal synthesis circuit described above is unable to sufficiently attenuate the mechanical vibration component because the low-pass filter is a first-order filter, and therefore the servo loop There are disadvantages in that the customization becomes unstable, the operation noise becomes louder during the seek operation to move the head to the target position, and in some cases, malfunctions may occur.

本発明の目的は、以上説明したような有害な機械振動成
分を、充分に減衰させることを可能にする新たな速度信
号合成回路を提供することである。An object of the present invention is to provide a new speed signal synthesis circuit that can sufficiently attenuate harmful mechanical vibration components as described above.

これによってサーボ全安定にかけることができ、信頼性
の高いサーボ機構を実現できる。This allows the servo to be fully stabilized, making it possible to realize a highly reliable servo mechanism.

本発明の回路は、磁気ディスク装置の可動ヘッドのシー
ク動作速度を制御するために前記可動ヘッドの位置信号
と該可動ヘッドの駆動電流とに基づいて速度信号を得る
速度信号合成回路に２いて、前記位置信号の微分２よび
微分結果のゲイン合わせを行なう速度検出手段と、 前記駆動電流のゲイン合わせを行なうゲイン合わせ手段
と、 該ゲイン合わせ！手段の出力と前記速度検出手段の出力
とを加え合わせるｍｌ混合器と、該第１混合器の出力に
含まれる高域周波数成分を濾過する第１濾過手段と、 前記ゲイン合わせ手段の他の出力全ゲイン合わせすると
ともに該出力に含まれる高域周波数成分を濾過する第２
濾過手段と、 前記第１濾過手段の出力と前記第２濾過手段の出力とを
加え合わせて前記速度信号を得る第２混合器 とを設けたことを特徴とする。The circuit of the present invention includes a speed signal synthesis circuit that obtains a speed signal based on a position signal of the movable head and a drive current of the movable head in order to control the seek operation speed of the movable head of a magnetic disk device. Speed detection means for performing differential 2 of the position signal and gain adjustment of the differentiation result; gain adjustment means for performing gain adjustment for the drive current; and said gain adjustment! ml mixer for adding the output of the means and the output of the speed detection means; a first filtering means for filtering high frequency components included in the output of the first mixer; and another output of the gain matching means. A second filter that combines all gains and filters high frequency components included in the output.
The present invention is characterized in that it includes a filtration means, and a second mixer that adds the output of the first filtration means and the output of the second filtration means to obtain the speed signal.

次に本発明の実施例について図面全参照して説明する。Next, embodiments of the present invention will be described with reference to all the drawings.

第２図は本発明の一実施例の構成會示すブロック因であ
る。FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

本笑施例は、２仄ローパスフイルタ３と、２次バンドパ
スフィルタ４と、３個のゲイン合わせ要素５．６および
７と、２個の混合器８および９と、サーボ七−夕１０１
と、可動ヘッド５１０２と、速度検出回路１０３と、電
流検出回路１０４とから構成されている。各ブロックの
甲に記されているのは、そのブロックの伝達関数である
。This embodiment includes a two-way low-pass filter 3, a second-order band-pass filter 4, three gain matching elements 5, 6 and 7, two mixers 8 and 9, and a servo Tanabata 101.
, a movable head 5102 , a speed detection circuit 103 , and a current detection circuit 104 . What is written on the top of each block is the transfer function of that block.

サーボモータ１０１は駆動電流ｌ。によって駆動され、
その力定数はに、である。ｉＪ’ｍヘッド部１０２（質
ｉはＩＶ）は、サーボモータ１０１によって駆動され、
シーク動作を行なう。速度検出回路１０３は、位置信号
Ｘ。を値分し、ゲイン往わせ（ゲイン’−１Ｇｖ）して
、第１の速度検出信号ｖ０を得、電流検出回路１０４は
、駆動電流１０のゲイン合わ’ｔ　（ゲインはＧｏ）シ
て、電流検出信号■、（得る。The servo motor 101 has a driving current l. driven by
Its force constant is . The iJ'm head section 102 (quality i is IV) is driven by a servo motor 101,
Perform a seek operation. The speed detection circuit 103 receives the position signal X. is divided into values and the gain is increased (gain '-1Gv) to obtain the first speed detection signal v0, and the current detection circuit 104 adds the gain of the drive current 10 't (gain is Go) Detection signal ■, (obtain.

ゲイン合わせ要素５のゲインＧＫは、 Ｇｔ　＝（ＧｖＫｙ）／（ＧｏＭ）に定める。すると、
ゲイン合わせ要素５の出力■８はＩ　、＝ｏえＩ、＝Ｇ
Ｇｏ。■。The gain GK of the gain matching element 5 is determined as Gt = (GvKy)/(GoM). Then,
Output of gain matching element 5■8 is I,=oeI,=G
Go. ■.

＝ＣＧｖ　ＫＦ　ＩＭ　）　”　ｏとなる。一方、駆動
電流１゜かう第１の速度検出信号Ｖ□までの伝達利得ｖ
ｔ　／　”ｏ　＝　（ＧｖＫｐ　）　／　（Ｍ８　）　
であることから、ｖ１Ｓ＝（ＧｖＫ２／Ｍ）■。であり
、ゲイン合わせ要素５の出力Ｉ、は結局ｔ、Ｖ１Ｓと表
わせる。= CGv KF IM ) ” o.On the other hand, the transfer gain v to the first speed detection signal V□ which is 1° drive current
t/”o=(GvKp)/(M8)
Therefore, v1S=(GvK2/M)■. The output I of the gain matching element 5 can be expressed as t, V1S.

２仄ローパスフイルタ３と２次バンドパスフィルタ４と
の伝達量数社、それぞれ ω。”／（８”＋２ζω。Ｓ＋ω。′）と、２ζω。８
／Ｃ８”＋２ζω。Ｓ＋ω。′）である。ここに、ω。The amount of transmission between the two-way low-pass filter 3 and the second-order band-pass filter 4 is ω. ”/(8”+2ζω.S+ω.′) and 2ζω. 8
/C8"+2ζω.S+ω.'). Here, ω.

祉２次ローパスフィルタ３のカットオフ角周波数であり
、同時に２次バンドパスフィルタ４の中心角周波数でも
ある。また１、ζは２次系のダンピングファクタで、２
次ローハスフィルタ３０屑特性が所望の特性となるよう
に選べばよい。バターワース特性（最平坦特性）ならζ
＝　ｔ／ｖ／２　とする。This is the cutoff angular frequency of the second-order low-pass filter 3 and also the center angular frequency of the second-order band-pass filter 4. In addition, 1 and ζ are the damping factors of the second-order system, and 2
What is necessary is just to choose so that the next locus filter 30 debris characteristic will become a desired characteristic. Butterworth characteristic (flatest characteristic) is ζ
= t/v/2.

ゲイン合わせ要素６と７のゲインはそれぞれ２ζ／ω。The gains of gain matching elements 6 and 7 are 2ζ/ω, respectively.

とｌ／（２ζω。）Ｋ定めるａｔ流検出信号■１は、ゲ
イン会わせ要素５，６を経て混合器８により第１の速度
検出信号ｖ０　と加え合わされ、２次ローパスフィルタ
３に入力される。また、電流検出信号１０　はゲイン合
わせ要素５．７ｔ−経て２次バンドパスフィルタ４にも
入力される。両フィルタの出力は混合器９で加算されて
、第２の速度検出信号Ｖ、となる。ここでｖ、全ブロッ
ク図にｖｓ＝（”１＋ｖｌ（２ζ／ωｏ月ωｏ’／（８
”＋２（ωｏＳ＋ｃｃ＋。’）＋（Ｉｍ／（ｚζω。月
（２ζωＯ８）／（Ｓ”＋２ζω。Ｓ＋ωｏＪである。The at flow detection signal 1 determined by l/(2ζω.)K is added to the first speed detection signal v0 by the mixer 8 via the gain matching elements 5 and 6, and is input to the second-order low-pass filter 3. . The current detection signal 10 is also input to the second-order bandpass filter 4 through the gain adjustment element 5.7t. The outputs of both filters are added in a mixer 9 to form a second speed detection signal V. Here, v, all block diagrams are vs=("1+vl(2ζ/ωomonthωo'/(8
"+2(ωoS+cc+.')+(Im/(zζω.Moon(2ζωO8)/(S"+2ζω.S+ωoJ).

Ｉ、＝Ｖ１８　ｔ−代入すると、Ｖ襲＝＝　Ｖ、（ω♂
＋２ζωｏＳ＋”）／Ｃ８”＋２（ω。ｂ＋ω、ｙ）＝
ｖ。By substituting I, = V18 t-, V attack == V, (ω♂
+2ζωoS+”)/C8”+2(ω.b+ω,y)=
v.

となる。第２の速度検出信号Ｖ、は第１の速度検出信号
Ｖユ　と等価であり、第２の速度検出信号Ｖ。becomes. The second speed detection signal V is equivalent to the first speed detection signal V.

は速度信号として正しく合成されていることがわかる。It can be seen that is correctly synthesized as a speed signal.

２次ローパスフィルタ３と２次バンドパスフィルタ４と
は、演算増幅器を用いたアクティブＲ，Ｃフィルタで容
易に実現でき、その具体的回路はハンドブック等に記載
されてｉで公知であるので、ここでは省略する。また、
ＬＣフィルタで実現することも可能である。本発明は、
従来１次ローパスフィルタ３を使用していたところに２
次ローパスフィルタを用いるようにしたので有害な高域
機械撮動成分を十分減衰させることができる。しかし、
ただ単に１次ローパスフィルタを２次ローパスフィルタ
３にしただけでは、正しい速度信号を合成できないので
、これを補正するため、電流検出信号’ｘｋ２次バンド
パスフィルタ４に通した信号を加算したわけである。The secondary low-pass filter 3 and the secondary band-pass filter 4 can be easily realized with active R and C filters using operational amplifiers, and their specific circuits are described in handbooks and are well known, so they will not be described here. I will omit it here. Also,
It is also possible to implement it with an LC filter. The present invention
Conventionally, 1st order low pass filter 3 was used, but 2
Since the second-order low-pass filter is used, harmful high-frequency mechanical imaging components can be sufficiently attenuated. but,
Simply changing the first-order low-pass filter to the second-order low-pass filter 3 will not synthesize the correct speed signal, so in order to correct this, the current detection signal 'xk is added to the signal passed through the second-order band-pass filter 4. be.

第２図は一実施例であり、各ゲイン合わせ要素の配置は
実際の回路構成の都合で本質を変えることなく変更でき
る。例えば、第２図の２次バンドパスフィルタ４の中心
周波数のゲインは１であるが、実際の回路でｉｄｌより
太氏い値ｒｓ入ｔ　ｙ　ｔある。その場合にゲイン合わ
せ要素７の値は２次バンドパスフィルタ４のゲインに対
応して変更することになる。また、ゲイン合わせ要素７
は２次バンドパスフィルタ４の後に置いてもよい。FIG. 2 shows one embodiment, and the arrangement of each gain matching element can be changed depending on the actual circuit configuration without changing the essence. For example, the gain of the center frequency of the second-order bandpass filter 4 in FIG. 2 is 1, but in an actual circuit, there is a value rs input t y t that is thicker than idl. In that case, the value of the gain adjustment element 7 will be changed in accordance with the gain of the secondary bandpass filter 4. In addition, gain adjustment element 7
may be placed after the secondary bandpass filter 4.

なお、本＠８Ａｔ従来の速度信号合成回路と縦続持続し
て使うこともできる。第１の速度信号として従来の速度
信号合成回路の出力信号を用いることにすると、位置信
号微分による速波信号は、従来回路の１次ローパスフィ
ルタと本発明の２次ローパスフィルタとを通過する。こ
の結果により、有害な面域機械振動成分は総合３次のロ
ーパスフィルタにより一層効果的に減衰させられること
になる。Note that this @8At can also be used in cascade with a conventional speed signal synthesis circuit. When the output signal of the conventional speed signal synthesis circuit is used as the first speed signal, the fast wave signal resulting from position signal differentiation passes through the first-order low-pass filter of the conventional circuit and the second-order low-pass filter of the present invention. As a result, harmful surface area mechanical vibration components can be more effectively attenuated by the overall third-order low-pass filter.

本発明は、以上説明したように、２次ローパスフィルタ
を用いることにより、有害な機械振動成分を元号に減衰
させた速度信号を合成することができ、安定なサーボ機
構を実現できる効果がある。As explained above, the present invention is capable of synthesizing a speed signal in which harmful mechanical vibration components are attenuated by using a second-order low-pass filter, and has the effect of realizing a stable servo mechanism. .

【図面の簡単な説明】[Brief explanation of drawings]

第１図は２相ザ一ボ方式の位置イぎ号を示す図、第２図
は本発明の一実施例を示すブロック図である。 ｌ・・・・・・第１の位置信号、２・・川・第２の位置
信号、３・・・・・２次ローパスフィルタ、４・旧・・
２次バンドパスフィル９、’５，６．７・・・・・・ゲ
イン合わせ要素、８．９・・・・・・混合器、１０１・
・・・・・サーボモータ、１０２・・・・・・ヘッド可
動部、１０３・・・・・・速夏検出回路、１０４・・・
・・・電流検出回路。FIG. 1 is a diagram showing the position key of a two-phase single-bore system, and FIG. 2 is a block diagram showing an embodiment of the present invention. l...First position signal, 2...River/second position signal, 3...Second order low pass filter, 4...Old...
Secondary band pass filter 9, '5, 6.7... Gain matching element, 8.9... Mixer, 101.
... Servo motor, 102 ... Head moving part, 103 ... Quick summer detection circuit, 104 ...
...Current detection circuit.

Claims (1)

【特許請求の範囲】 磁気ディスク装置の可動ヘッドのシーク動作速度全制御
するために前記可動ヘッドの位置信号と該可動ヘッドの
駆動電流とに基づいて速度信号を得る速度信号合成回路
において、 前記位置信号の微分および微分結果のゲイン合わせ全行
なう速度検出手段と、 前記駆動電流のゲイン合わせを行なうゲイン合わせ手段
と、 該ゲイン合わせ手段の出方と前記速度検出手段の出力と
を加え合わせる第１混合器と、該第１混合器の出力に含
まれる高域周波数成分を濾過する第１濾過手段と、 前記ゲイン合わせ手段の他の出方をゲイン合わせすると
ともに該出方に含まれる高域周波数成分を濾過する第２
濾過手段と、 前記第１濾過手段の出力と前記第２濾過手段の出力とを
加え合わせて前記速度信号金得る第２混合器、 と金設けたことを特徴とする速度信号合成回路。[Scope of Claims] A speed signal synthesis circuit that obtains a speed signal based on a position signal of the movable head and a drive current of the movable head in order to fully control the seek operation speed of the movable head of a magnetic disk device, comprising the steps of: A speed detecting means for performing all signal differentiation and gain adjustment of the differential result; a gain adjusting means for performing gain adjustment of the drive current; and a first mixing method for adding the output of the gain adjusting means and the output of the speed detecting means. a first filtering means for filtering a high frequency component included in the output of the first mixer; and a first filtering means for filtering a high frequency component included in the output of the first mixer; The second to filter
A speed signal synthesis circuit comprising: a filtering means; and a second mixer for adding the output of the first filtering means and the output of the second filtering means to obtain the speed signal.
JP14201683A 1983-08-03 1983-08-03 Speed signal composing circuit Pending JPS6032170A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14201683A JPS6032170A (en) 1983-08-03 1983-08-03 Speed signal composing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14201683A JPS6032170A (en) 1983-08-03 1983-08-03 Speed signal composing circuit

Publications (1)

Publication Number Publication Date
JPS6032170A true JPS6032170A (en) 1985-02-19

Family

ID=15305409

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14201683A Pending JPS6032170A (en) 1983-08-03 1983-08-03 Speed signal composing circuit

Country Status (1)

Country Link
JP (1) JPS6032170A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0235600A2 (en) * 1986-03-03 1987-09-09 International Business Machines Corporation Magnetic head positioning apparatus and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0235600A2 (en) * 1986-03-03 1987-09-09 International Business Machines Corporation Magnetic head positioning apparatus and method

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