JPS60222712A - Computing method of amount of tape - Google Patents

Computing method of amount of tape

Info

Publication number
JPS60222712A
JPS60222712A JP7915784A JP7915784A JPS60222712A JP S60222712 A JPS60222712 A JP S60222712A JP 7915784 A JP7915784 A JP 7915784A JP 7915784 A JP7915784 A JP 7915784A JP S60222712 A JPS60222712 A JP S60222712A
Authority
JP
Japan
Prior art keywords
tape
calculation value
amount
time
calculation
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.)
Granted
Application number
JP7915784A
Other languages
Japanese (ja)
Other versions
JPH0447919B2 (en
Inventor
Maki Kawabe
河部 眞樹
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.)
Nakamichi Corp
Original Assignee
Nakamichi Corp
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 Nakamichi Corp filed Critical Nakamichi Corp
Priority to JP7915784A priority Critical patent/JPS60222712A/en
Publication of JPS60222712A publication Critical patent/JPS60222712A/en
Publication of JPH0447919B2 publication Critical patent/JPH0447919B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/34Indicating arrangements 
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/11Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier
    • G11B27/13Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier the information being derived from movement of the record carrier, e.g. using tachometer
    • G11B27/17Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier the information being derived from movement of the record carrier, e.g. using tachometer using electrical sensing means
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/90Tape-like record carriers

Landscapes

  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)

Abstract

PURPOSE:To obtain the computing method, which has few errors and the like and can compute the display value, whose display errors are small, by computing the remaining amount of tape, based on the pulse data generated in response to the running of the tape. CONSTITUTION:Pulse generators 3 and 4 detect the required number of detecting pieces, which are attached to each reel table at an equal interval, in response to the rotations of an S-side reel table 1 and a T-side reel table 2 accompanied by the running of tape, and generates the pulse data based on each reel. Period detectors 5 and 6 on the S-side and the T-side detect the rotary periods T1 and T2 on the reels of the S side and the T side, respectively, based on the pulse data. The detected data are sequentially outputted to an operating circuit 7. The operating circuit 7 computes the remaining amount of the tape or the used time thereof by using the data T1 and T2. In response to the sampling operation instruction signal from a control circuit 11, averaging process is performed at a constant period. Then, the result is outputted to a display element 9 and a memory circuit 10 as a display value.

Description

【発明の詳細な説明】 本発明は磁気記録再生装置等において、例えばテープ残
量時間、或はテープ使用時間のテープ量を演算し、これ
をデジタル表示する方法に用いて好適なテープ量の演算
方法に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention is suitable for use in magnetic recording and reproducing devices, etc., for calculating the tape amount, such as remaining tape time or tape usage time, and displaying it digitally. Regarding the method.

従来のテープ量表示方法に於いては、例えばテープリー
ルの回転に応答するパルスの検出によりリールの周期等
をめ、このデータを基にテープ残量或は使用時間を演算
し、その演算値をそのまま表示値として表示手段で表示
していた。
In the conventional tape amount display method, for example, the period of the reel is determined by detecting a pulse that responds to the rotation of the tape reel, the remaining amount of tape or usage time is calculated based on this data, and the calculated value is calculated. It was displayed as a display value as it is on the display means.

しかし、これらの検出データはテープのリールへの巻回
むらや、検出時の検出誤差等により、必ずしも正確なデ
ータとはならず、従って、これらのデータを基に演算さ
れたテープ残量或は使用時間の直接表示は誤差の大きな
表示となる欠点があった・ 本発明は、これらの誤差発生を考慮し、表示誤差の小さ
な表示値演算を可能とする演算方法を提 ・供するもの
である。
However, these detection data are not necessarily accurate due to uneven winding of the tape on the reel, detection errors during detection, etc. Therefore, the remaining amount of tape or Direct display of usage time has the drawback of displaying large errors. The present invention takes these errors into consideration and provides a calculation method that enables display value calculations with small display errors.

第1図は本発明の演算方法を実現する一実施例のブロッ
クダイヤグラムで、1はサプライ側(以後S側と称す)
リール台を示し、その近傍に配置されたS側パルス発生
器3の出力端子3□は、その出力端子5□が演算回路7
の入力端子7□に接続されたS側周期検出器5の入力端
子5□に接続されている。
FIG. 1 is a block diagram of an embodiment that implements the calculation method of the present invention, and 1 is the supply side (hereinafter referred to as the S side).
The output terminal 3□ of the S-side pulse generator 3 shown in the figure shows the reel stand, and the output terminal 5□ is connected to the arithmetic circuit 7.
It is connected to the input terminal 5□ of the S-side period detector 5, which is connected to the input terminal 7□ of the S-side period detector 5.

同様にしてティクアップ側(以後T側と称す)リール台
2の近傍に配置されたT側パルス発生器4の出力端子4
1は、その出力端子6□が演算回路7の入力端子72に
接続されたT側周期検出器6の入力端子61に接続され
ている。
Similarly, the output terminal 4 of the T-side pulse generator 4 is placed near the reel stand 2 on the pick-up side (hereinafter referred to as the T-side).
1 is connected to the input terminal 61 of the T-side period detector 6 whose output terminal 6 □ is connected to the input terminal 72 of the arithmetic circuit 7 .

演算回路7の出力端子7.はドライバ回路8の入力端子
81に接続されると共に記憶回路10の入力端子103
に接続され、ドライバ回路8の出力端子8□は表示素子
9の入力端子9□に接続されている。記憶回路10の出
力端子102は演算回路7の入力端子74に接続され、
制御回路11の出力端子11□、11□はそれぞれ演算
回路7の入力端子73、及び記憶回路10の入力端子1
01に接続されている。 以上の構成において、次にそ
の動作を説明する。パルス発生器3.4はテープ走行に
伴うS側リール台1、及びT側す−ル台2の回転に応答
して各リール台に等間隔で所要数付された検出片11〜
lい2□〜24をセンサ(磁気的、光学的等)で検出す
ることにより、各リールの回転に基づいたパルスデータ
を発生する。S側及びT側の周期検出器5.6はこれら
のパルスデータに基づいてそれぞれS側、T側のリール
の回転周期T工、T2を検出し、この検出データを演算
回路7に逐次出力する。
Output terminal 7 of arithmetic circuit 7. is connected to the input terminal 81 of the driver circuit 8 and also to the input terminal 103 of the memory circuit 10.
The output terminal 8□ of the driver circuit 8 is connected to the input terminal 9□ of the display element 9. The output terminal 102 of the memory circuit 10 is connected to the input terminal 74 of the arithmetic circuit 7,
Output terminals 11□ and 11□ of the control circuit 11 are the input terminal 73 of the arithmetic circuit 7 and the input terminal 1 of the memory circuit 10, respectively.
01. Next, the operation of the above configuration will be explained. The pulse generator 3.4 responds to the rotation of the S-side reel stand 1 and the T-side reel stand 2 as the tape runs, and detects the required number of detection pieces 11 to 11 attached to each reel stand at equal intervals.
By detecting 12□ to 24 with a sensor (magnetic, optical, etc.), pulse data based on the rotation of each reel is generated. The S-side and T-side period detectors 5.6 detect the rotation periods T and T2 of the S-side and T-side reels based on these pulse data, respectively, and sequentially output the detected data to the arithmetic circuit 7. .

演算回路7は、これらのデータT1、T2を用いて周知
の所要の演算式に従いテープ残量或は使用時間の一次演
算値を例えば逐次演算し、さらに制御回路11からのサ
ンプリング演算命令信号に応答してかかる一次演算値を
一定周期Tでサンプリングして平均化処理をした後、そ
の結果を表示値として表示させるべくドライバ回路8に
出力すると共に、続く平均化処理のために記憶回路10
にもこの結果を出力する。
The arithmetic circuit 7 uses these data T1 and T2 to sequentially calculate, for example, a primary calculation value of the remaining tape amount or usage time according to a known required calculation formula, and further responds to a sampling calculation command signal from the control circuit 11. After sampling and averaging the primary calculated values at a constant period T, the results are output to the driver circuit 8 to be displayed as a display value, and are also sent to the memory circuit 10 for the subsequent averaging process.
This result is also output to .

ここで、演算回路7における演算、平均化式につきテー
プ残量時間をめる場合を例に説明すると、先ず各リール
の周期T1、T2を基にテープ残量時間の一次演算値P
nをめる演算には次の演算式が使用される。
Here, to explain the case where the remaining tape time is calculated based on the calculation and averaging formula in the calculation circuit 7, first, the primary calculation value P of the remaining tape amount is based on the cycles T1 and T2 of each reel.
The following arithmetic expression is used to calculate n.

但し、aはテープ厚、■はテープ速度、Sはリールハブ
面積、Lはテープ全長 そして、制御回路11からのサンプリング信号に応答し
てサンプリングされた一次演算値Pnか 5ら二次演算
値Rnをめる演算には次の平均化式%式% (1) 但し、mは平均化するデータ個数、Jは一次演算値の一
サンプリング周期におけるテープ残量予測値であるが、
本例では演算値が時間であるので、Jは一次演算値のサ
ンプリング周期Tとする。
However, a is the tape thickness, ■ is the tape speed, S is the reel hub area, L is the total length of the tape, and the secondary calculation value Rn is obtained from the primary calculation value Pn sampled in response to the sampling signal from the control circuit 11. The following averaging formula % formula % (1) is used for the calculation to calculate the average value.
In this example, since the calculated value is time, J is the sampling period T of the primary calculated value.

かかる平均化式は、最も簡単なm = 2の場合を例に
とればその理解が容易となる。
Such an averaging formula can be easily understood by taking the simplest case of m = 2 as an example.

即ち、m = 2の場合、上式(1)は次の様になる。That is, in the case of m=2, the above equation (1) becomes as follows.

即ち、サンプリング時刻tnにおけるテープ残量時間を
表示するための二次演算値Rnは、その−サンプリング
周期前のサンプリング時刻tn−1における同゛二次演
算値Rロー1にこの時刻間におけるテープ使用の予測時
間T(サンプリング周期)を加えたものと、サンプリン
グ時刻tnにおける一次演算値Pnとの平均により演算
するものである。
That is, the secondary calculation value Rn for displaying the remaining tape amount time at the sampling time tn is equal to the same secondary calculation value Rrow 1 at the sampling time tn-1 before the -sampling period. The calculation is performed by averaging the sum of the predicted time T (sampling period) and the primary calculation value Pn at the sampling time tn.

この様にして演算された表示である二次演算値Rnの推
移を第2図(図中■)に示す。尚、縦軸は誤差量を、横
軸は時間の経過を示す。第2図中データ■は各サンプリ
ング時刻における一次演算時間Pnを示すが、−次演算
時間Pnはテープの巻回むらや、検出時の検出誤差等に
より、プラス、マイナスに誤差を生じながら推移してゆ
く。これに対し、前記の平均化により演算された二次演
算時間Rn(図中のデータ■)はその誤差がより少ない
ことがわかる。
The transition of the secondary calculated value Rn, which is the display calculated in this manner, is shown in FIG. 2 (■ in the figure). Note that the vertical axis represents the amount of error, and the horizontal axis represents the passage of time. Data ■ in Figure 2 indicates the primary calculation time Pn at each sampling time, but the negative calculation time Pn changes with positive and negative errors due to uneven tape winding, detection errors during detection, etc. I'm going to go. On the other hand, it can be seen that the error in the secondary calculation time Rn (data ■ in the figure) calculated by the above-mentioned averaging is smaller.

さらに、m = 3以上の場合であっても、先行する所
要数の二次演算値Rn−1、Rn−2、・・・・を記憶
データとして記憶回路10に記憶しておけば(1)式に
基づいて演算は可能であり、第2図中のデータ■はm=
3のときの二次演算時間の推移を示す。
Furthermore, even if m = 3 or more, if the required number of preceding secondary operation values Rn-1, Rn-2, . . . are stored in the storage circuit 10 as storage data, (1) Calculations are possible based on the formula, and the data ■ in Figure 2 is m =
3 shows the transition of the secondary calculation time at the time of 3.

図からも明らかな様に、この場合はm=2のとき以上に
誤差の少ない演算値を得ることができる。
As is clear from the figure, in this case it is possible to obtain a calculated value with less error than when m=2.

なお、テープ使用時間の二次演算値をめる場合の平均化
式は、 となることは容易に理解されるところなので、その説明
は省略する。
It should be noted that since it is easily understood that the averaging formula for calculating the quadratic calculation value of the tape usage time is as follows, the explanation thereof will be omitted.

但し、上述の平均化式でめた二次演算値を表示値として
表示する場合、テープ量の演算表示方法によってはデー
タの平均化個数m或はサンプリング周期Tの値により以
下に説明する誤差を生ずる場合があるので、かかる値に
ついては配慮が必要となる。 即ち、例えば片面45分
使用可能と謳ったテープであっても実際のテープ量は製
造メーカで異なり、47分であったり、46分であった
りして、その量にはバラツキがある。
However, when displaying the quadratic calculation value obtained using the above-mentioned averaging formula as a display value, depending on the method of calculation and display of the tape amount, the error explained below may be calculated depending on the averaged number of data m or the value of the sampling period T. Therefore, consideration must be given to such values. That is, for example, even if a tape claims to be usable for 45 minutes on one side, the actual amount of tape varies depending on the manufacturer, and may be 47 minutes or 46 minutes, and the amount varies.

しかし、テープ量の演算表示は、テープの公称使用時間
を基準にしてテープ巻取り終了時にテープの使用或は残
量時間の表示値が例えば公称使用時間45分の時間経過
を表示すべく、実際のテープの実走行時間でなく演算時
間を演算表示するのが一般的である。
However, the calculation and display of the tape amount is based on the nominal usage time of the tape, and the displayed value of the tape usage or remaining amount time at the end of tape winding is to display the elapsed time of, for example, 45 minutes of the nominal usage time. It is common to display the calculation time rather than the actual running time of the tape.

第3図は、公称時間よりも実際には長時間使用できるテ
ープの使用量を演算表示した場合の、−次演算値Pnと
二次演算値Rnのテープ実走行時間経過に対する変化の
様子を示したものである。
Figure 3 shows how the negative calculated value Pn and the secondary calculated value Rn change over the course of the actual tape running time when the amount of tape used that can actually be used for a longer time than the nominal time is calculated and displayed. It is something that

−次演算値Pnにおいては実走行時間に対して一定の割
合で誤差を生じ、その誤差はサンプリング周期Tの累積
に対し累積されるので、−次演算 −値Pnは一定の傾
きを持つ図中のデータ■の様になる。これに対し、表示
値である二次演算値Rnは、m = 2のときは図中■
、又m = 3のときは図中のデータ■の様な傾きを示
す。つまり、二次演算値Rnは演算回数を重ねるにつれ
て一次演算値Pnに一定の誤差αを保って追従していく
ことがわかる。
In the -th calculation value Pn, an error occurs at a constant rate with respect to the actual running time, and the error is accumulated over the accumulation of the sampling period T. Therefore, the -th calculation value Pn has a constant slope. The data will look like ■. On the other hand, the secondary calculation value Rn, which is the displayed value, is as shown in the figure when m = 2.
, and when m = 3, the data shows a slope like ■ in the figure. In other words, it can be seen that as the number of calculations increases, the secondary calculation value Rn follows the primary calculation value Pn while maintaining a constant error α.

公称45分テープで実際の使用時間が47分の場合、誤
差αはサンプリング周期T=10秒とするとm = 2
で約0.8秒、m = 3で約2.5秒となり、さらに
mを大きくすると、その誤差もさらに大きくなる。これ
に対して、サンプリング周期Tを小さくした場合、この
誤差αは小さくなる。
If the actual usage time is 47 minutes for a nominally 45 minute tape, the error α is m = 2, assuming the sampling period T = 10 seconds.
When m = 3, it is about 0.8 seconds, and when m = 3, it is about 2.5 seconds.If m is further increased, the error becomes even larger. On the other hand, when the sampling period T is made smaller, this error α becomes smaller.

ここで、データの平均化個数mについては、第2図及び
第3図から明らかなように、その個数を多くすると(1
)式による誤差補正に対しては好ましいが、第3図に示
す演算値に対する追従性に対しては好ましくない結果に
なる。
Here, as is clear from Figures 2 and 3, when the average number m of data is increased, (1
Although this is preferable for error correction using the equation ), the result is unfavorable for tracking the calculated values shown in FIG.

このため、データの平均化個数m或はサンプリング周期
Tの値はかかる誤差を考慮して選ぶ必要がある。なお、
データの平均化個数mを多くしても、誤差αの情報を第
(1)式中の予測値Jに前以て加味しておけば、誤差α
を除くは可能である。
Therefore, it is necessary to select the number m of data to be averaged or the value of the sampling period T in consideration of such errors. In addition,
Even if the number m of averaged data is increased, if information on the error α is taken into account in advance to the predicted value J in equation (1), the error α
It is possible to exclude.

上記の実施例においてはテープ残量或はテープ使用の時
間演算につき説明したが、本発明演算方法は、これに限
ることなく、テープ残量或はテープ使用の割合%を演算
する場合にも適用できることは勿論であり、この場合(
1)式中のJは−サンプリング周期におけるテープ使用
の予測割合%となる。
In the above embodiment, the calculation of the remaining amount of tape or the time of use of the tape has been explained, but the calculation method of the present invention is not limited to this, but can also be applied to the case of calculating the remaining amount of tape or the percentage of tape usage. Of course it is possible, and in this case (
1) J in the equation is the predicted percentage of tape usage in the -sampling period.

以上の本発明によれば、誤差の少ないテープ量の演算が
可能な演算方法を提供できるものである。
According to the present invention described above, it is possible to provide a calculation method capable of calculating the tape amount with little error.

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

第1図は本発明の一実施例のブロックダイヤグラム、第
2図、第3図は本文中の一次演算値Pn。 二次演算値Rnの説明に供する図。 1・・・S側リール台、2・・・T側す−ル台、3・・
・S側パルス発生器、4・・・T側パルス発生器、5・
・・S側周期検出器、6・・・T側周期検出器、7・・
・演算回路、8・・・ドライバ回路、9・・・表示素子
、10・・・記憶回路、11・・・制御回路 特許出願人 ナカミチ株式会社 代表者 中道仁部
FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are primary calculation values Pn in the text. FIG. 4 is a diagram for explaining a secondary calculation value Rn. 1...S side reel stand, 2...T side reel stand, 3...
・S side pulse generator, 4...T side pulse generator, 5・
...S side period detector, 6...T side period detector, 7...
・Arithmetic circuit, 8...Driver circuit, 9...Display element, 10...Memory circuit, 11...Control circuit Patent applicant Nakamichi Co., Ltd. Representative Jinbe Nakamichi

Claims (2)

【特許請求の範囲】[Claims] (1) テープ走行に応答して発生するパルスデータを
検出し、この検出パルスデータをもとに所要のテープ残
量演算式に従ってテープ残量を表す一次演算値をめ、さ
らに一定周期ごとの前記−次演算値をもとに次の平均化
式 (但し、Pnを時刻tnにおける一次演算値、mを平均
化するデータ個数、Jを一次演算値の一サンプリング周
期におけるテープ残量予測値) により二次演算値Rnを演算し、この二次演算値Rnを
時刻tnにおけるテープ残量の演算値とすることを特徴
とするテープ量の演算方法。
(1) Detect the pulse data generated in response to tape running, calculate the primary calculation value representing the remaining tape amount according to the required tape remaining amount calculation formula based on this detected pulse data, and then calculate the - Based on the next calculation value, use the following averaging formula (where Pn is the primary calculation value at time tn, m is the number of data to be averaged, and J is the predicted tape remaining amount in one sampling period of the primary calculation value). A method for calculating a tape amount, characterized in that a secondary calculation value Rn is calculated, and this secondary calculation value Rn is used as a calculation value of the remaining tape amount at time tn.
(2) テープ走行に応答して発生するパルスデータを
検出し、この検出パルスデータをもとに所要のテープ使
用量演算式に従ってテープ使用量を表す一次演算値をめ
、さらに一定周期ごとの前記−次演算値をもとに次の平
均化式 (但し、Pnを時刻tnにおける一次演算値、mを平均
化するデータ個数、Jを一次演算値の一サンプリング周
期におけるテープ使用量予測値) により二次演算値Rnを演算し、この二次演算値Rnを
時刻tnにおけるテープ使用量の演算値とすることを特
徴とするテープ量の演算方法。
(2) Detect the pulse data generated in response to tape running, calculate the primary calculation value representing the tape usage amount according to the required tape usage amount calculation formula based on this detected pulse data, and then calculate the - Based on the next calculation value, use the following averaging formula (where Pn is the primary calculation value at time tn, m is the number of data to be averaged, and J is the predicted tape usage amount in one sampling period of the primary calculation value). A tape amount calculation method characterized by calculating a secondary calculation value Rn and using the secondary calculation value Rn as a calculation value of the tape usage amount at time tn.
JP7915784A 1984-04-19 1984-04-19 Computing method of amount of tape Granted JPS60222712A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7915784A JPS60222712A (en) 1984-04-19 1984-04-19 Computing method of amount of tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7915784A JPS60222712A (en) 1984-04-19 1984-04-19 Computing method of amount of tape

Publications (2)

Publication Number Publication Date
JPS60222712A true JPS60222712A (en) 1985-11-07
JPH0447919B2 JPH0447919B2 (en) 1992-08-05

Family

ID=13682122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7915784A Granted JPS60222712A (en) 1984-04-19 1984-04-19 Computing method of amount of tape

Country Status (1)

Country Link
JP (1) JPS60222712A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027526A (en) * 1989-06-02 1991-07-02 Crane R Stephen Digital linear measuring device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027526A (en) * 1989-06-02 1991-07-02 Crane R Stephen Digital linear measuring device

Also Published As

Publication number Publication date
JPH0447919B2 (en) 1992-08-05

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