JPS63157837U

JPS63157837U -

Info

Publication number: JPS63157837U
Application number: JP4834387U
Authority: JP
Priority date: 1987-03-31
Filing date: 1987-03-31
Publication date: 1988-10-17

Description

[Brief explanation of the drawing]

第１図は本考案になるテープ走行速度制御回路
の原理ブロツク図、第２図は本考案の一実施例の
ブロツク図、第３図は、マイクロコンピユータに
より実行される制御プログラムのフローチヤート
、第４図は、リール巻き径と両リールパルス比と
からテープ長を決定するための図、第５図は、テ
ープ長と両リールパルス比からラダー出力を決定
するための図、第６図は、磁気テープ長をパラメ
ータとし両パルス比に対するラダー出力の関係を
示した図、第７図は、ラダー抵抗及びリール制御
アンプの回路図、第８図は、キヤプスタンモータ
及びリールの駆動機構図、第９図は、ＤＡＴのト
ラツクフオーマツト及びテープパターン図である
。１ａ……供給リール回転パルン検出手段、１ｂ
……巻き取りリール回転パルス検出手段、２……
算出手段、３……モータ駆動電圧生成手段、４…
…キヤプスタンモータ、５ａ……供給リール、５
ｂ……巻き取りリール、６ａ，６ｂ……回転セン
サ、７……マイクロコンピユータ、８……メモリ
、９……ラダー抵抗、１０……リール制御アンプ
。 Fig. 1 is a principle block diagram of the tape running speed control circuit according to the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, and Fig. 3 is a flowchart of a control program executed by a microcomputer. Figure 4 is a diagram for determining the tape length from the reel winding diameter and the pulse ratio of both reels, Figure 5 is a diagram for determining the rudder output from the tape length and the pulse ratio of both reels, and Figure 6 is a diagram for determining the rudder output from the tape length and the pulse ratio of both reels. Figure 7 is a circuit diagram of the ladder resistor and reel control amplifier; Figure 8 is a diagram of the capstan motor and reel drive mechanism; FIG. 9 is a diagram of the DAT track format and tape pattern. 1a... Supply reel rotation pulse detection means, 1b
...Take-up reel rotation pulse detection means, 2...
Calculation means, 3...Motor drive voltage generation means, 4...
... Capstan motor, 5a ... Supply reel, 5
b... Take-up reel, 6a, 6b... Rotation sensor, 7... Microcomputer, 8... Memory, 9... Ladder resistor, 10... Reel control amplifier.

Claims

[Scope of utility model registration request]

In an apparatus for recording or reproducing digital signals on a magnetic tape using a rotating head, means for detecting the number of rotational pulses per unit time of a take-up reel and a supply reel, and a means for detecting the number of rotation pulses per unit time of the take-up reel and the supply reel, respectively. a calculation means for calculating the ratio of the number of rotational pulses of the two rotational pulses; a drive voltage generation means for generating and outputting a motor drive voltage from the pulse number ratio by the calculation means and the magnetic tape length; and a rotation speed is controlled by the motor drive voltage. tape running speed control circuit consisting of a capstan motor and a capstan motor.