JPH02208857A - Tape driving controller - Google Patents

Abstract

PURPOSE:To suppress the damage of a tape to a minimum by switching a generating torque control circuit so as to keep the revolution speed of a take-up side reel motor constant when no regenerative control signal exists. CONSTITUTION:A control(CTL) signal regenerated with a CTL head 2 at the time of feeding the tape at high speed, after being amplified by an amplifier 3, is supplied to a velocity control means 4, and a velocity control signal is formed, and inputted to a reel motor driving circuit 34(35) via a low-pass filter (LPF) 7, and the generating torque of a reel motor 30(31) is controlled, and tape feed speed is controlled. Meanwhile, the CTL signal is supplied to a CTL signal detecting means 5, and the cycle of a regenerative CTL signal is detected, and the generative CTL signal exceeding a prescribed cycle is judged as a signal nonrecording part. When the tape arrives at the signal nonrecording part, the reel motor 30(31) is controlled so as to be rotated at constant revolu tion speed. In such a manner, it is possible to suppress the damage of the tape received at the time of feeding the tape at high speed to a minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape drive control device for a VTR or the like, and particularly to a tape drive control device suitable for limiting the maximum tape speed when the tape runs at high speed.

[Conventional technology]

In the conventional apparatus, as described in Japanese Patent Publication No. 62-35175, a reproduction control signal for controlling the tape running phase is used as the tape running speed information. That is, the torque of the take-up reel motor is controlled so that the reproduction control signal is reproduced at a predetermined frequency.

[Problem to be solved by the invention]

However, in the above-mentioned conventional technology, when the reproduction control signal is not obtained, the same driving voltage as at the time of startup is applied to the winding torque of the winding side reel motor. That is, in the non-recorded portion of the control signal, the tape runs at a speed faster than the speed set for high-speed search. Therefore, in order to stop a tape running at such a high speed, it is troublesome to have to consider a mode that runs at a higher speed than high-speed search, and at the same time, the circuit size required to stop the tape also increases. There was a problem.

An object of the present invention is to control the winding torque of the take-up reel motor during a high-speed search, even in the unrecorded portion of the control signal, to prevent tape damage caused during the high-speed search and when stopping. The goal is to minimize it.

[Means to solve the problem]

The above purpose is to provide a detection circuit that detects the presence or absence of a playback control signal, and when there is no playback control signal,
In order to keep the rotation speed of the reel motor on the take-up side constant,
This is achieved by switching the generated torque control circuit.

[Effect]

With the above method, when there is no generation control signal, the generated torque can be controlled so that the rotational speed of the take-up side reel motor is constant, and the tape running speed can be limited to a predetermined value. Therefore, the tape running speed during high-speed search does not increase above a predetermined value even if there is no playback control signal. Therefore, damage to the tape can be minimized.

〔Example〕

Hereinafter, a refreshing example of the present invention will be explained with reference to FIGS. 1 to 4.

FIG. 1 is a block diagram of the present invention, FIG. 2 is a schematic diagram of a tape running system of a VTR, FIG. 3 is an explanatory diagram of the operation of the present invention, and FIG. 4 is a specific circuit diagram of the present invention.

In FIG. 2, l is a magnetic tape, 2 is a control head, 14 is a system controller, 17 is a rotating cylinder, 18, 19 are guide rollers, 20a, 20
b is a magnetic head, 21 is a supply reel (hereinafter referred to as S reel), and 22 is a pick-up reel (hereinafter referred to as S reel).
It is abbreviated as TIJ-ru. ), 23-25 are guide posts, 2
6 is a tension pin on the supply side, 27 is a tension pin on the pick-up side, 28 and 29 are tape tension sensors, 30 is an S reel motor, 31 is a TURLE motor, 32 and 33 are tape tension control circuits, 35 is a reel a motor drive circuit; 36 and 37 are switching means; 3;
Numerals 8 and 39 are frequency generator (FG) sensors for detecting the rotational speed of the reel motors 30 and 31, respectively, and 40 is a winding torque control circuit for the reel motor on the winding side when the magnetic tape 1 is running at high speed.

The S reel 21 and the T U-reel n are independently and directly rotated by reel motors 30 and 31 each constructed of a DC motor. The magnetic tape 1 wound around each reel 21 and 22 is guided by guide rollers 18 and 19 and guide posts n to 5 so that it runs in sliding contact with a rotating cylinder 17 on which magnetic heads 20a and 20b are arranged. has been done.

Here, a fast forward operation mode (hereinafter abbreviated as FF mode) is used.

), the spindle motor is driven to rotate at high speed in the direction shown by arrow A in the figure so as to run the magnetic tape 1 in the forward direction at high speed. That is, the output of the winding torque control circuit 40 is connected to the T reel motor drive circuit 35 by the switching means 3.
7, it is input. On the other hand, the output of the tape tension control circuit 32 is inputted to the S reel motor drive circuit via the switching means 36. These switching means 36, 37
is controlled by the output of the system controller 14. Further, the tape tension controller includes tension pins 26 and 27 that are biased by springs in the tape running path, and the positions of the tension pins 26 and 27 applied to the magnetic tape 1 are detected by a tape tension sensor 29. The sensors 28 and 29 are usually angle sensors made up of potentiometers or the like. That is, the tension pins 26 and 27 balance the biasing spring force and the tape tension at predetermined positions, and detect the tape tension. The outputs of the tension sensors 28 and 29 are input to the tape tension control circuits 32 and 33, and in the FF mode, the outputs are fed back to the S reel motor 304.
The pack tension applied to the magnetic tape 1 is controlled by the torque generated by the S reel motor 30 (generated in the direction B in the figure).

On the other hand, control of the winding torque of the T-reel motor in the FF mode is performed by a control signal (hereinafter referred to as CTL head) reproduced by a control head (hereinafter referred to as CTL head) 2.
It is abbreviated as TL signal. ) so that the period of
Controls the winding torque of the T-reel motor. To be more specific, a CTL head 2 (or CTL) rack is formed in the longitudinal direction of the magnetic tape 1 during signal recording. CT of a predetermined constant period recorded by this CTL head 2
Since the L signal is reproduced by the fixed CTL head 2, the period of the reproduced CTL signal is inversely proportional to the tape running speed. Therefore, it is possible to discriminate whether the tape running speed is fast or slow based on the cycle of the reproduction CTL signal.If the T reel motor drive circuit 35 is controlled so that the cycle of the reproduction CTL signal becomes a predetermined cycle, the cycle of the reproduction CTL signal becomes a predetermined cycle. Fast speed search (FF) can be realized.Also, rewind operation mode (R
In EW), the S reel motor drive circuit 34 is similarly controlled, and the S reel 21 is driven to rotate at high speed in the direction indicated by arrow B in the figure. At this time, %TIJ-le motor drive circuit 3
5, the output of the tape tension control circuit is input through the switching means 37, and the torque in the direction indicated by the arrow in the figure is controlled in the same way as in the S reel motor in the FF mode. This controls the back tension applied to the magnetic tape 1 in the REW mode. In this way, the magnetic tape 1 is prevented from sagging when running at high speed,
ing.

By the way, here, since the reel motor 30 (or31) is rotated at a predetermined rotation speed using the reproduced CTL signal, for example, there may be a section in the middle of one magnetic tape 1 where no signal is recorded. If this happens, the CTL signal cannot be played back.

Therefore, in such a signal non-recording period, the FG flaw signal of the winding reel is monitored and the winding torque is controlled. That is, in the FF mode, the winding torque of the T reel motor 31 is controlled so that the output signal of the FG sensor 39 provided on the T reel motor 31 has a predetermined period, and the REV
In the mode, the winding torque of the S reel motor 30 is controlled so that the output signal of the FG sensor provided on the S reel motor 30 has a predetermined period. This reel motor 30
, or the reel motor 30, so that the output signal of the FG sensor installed at 31 or 39 has a predetermined period.
Alternatively, if the winding torque of 31 is controlled, reel 2
The tape running speed changes gradually depending on the tape winding diameter of 1 or 22. That is, as the tape runs, the tape winding diameter increases, and therefore the tape running speed increases in proportion to the winding diameter.

Therefore, the FG sensor 38 is adjusted so that the maximum speed at the end of the tape matches the tape running speed during CTL signal reproduction.
By setting the predetermined rotation period in (39), the maximum speed when the tape runs at high speed is the predetermined value (the maximum speed when reproducing the CTL signal).
can be limited to

FIG. 1 is a block diagram of the present invention, and is the same as wc2 diagram.
The same reference numerals are given to the parts and the same @-Zheng. 3 is an amplifier, 4 is a speed control means, 5 is a CTL signal detection means,
6 is a switch means, 7 is a low pass filter (hereinafter, LP
Abbreviated as F. ), 10 is the S reel FG signal input terminal, 11
is a T-reel FG signal input terminal, 12 is a switch means, 1
3 is a speed control means, 15 is a resistor, and 16 is a capacitor.

When the tape runs at high speed, the CTL signal traced back from the CTL head 2 is amplified by the amplifier 3 and then supplied to the speed control means 4 to form a speed control signal.

This speed control signal is input to the reel motor drive circuit 34 (35) via the LPF 7. This speed control signal controls the torque generated by the reel motor 30 (31), thereby controlling the tape running speed. At this time, the output of the CTL signal amplified by the amplifier 3 is transmitted to the CTL signal detection means 5.
is supplied to This CTL signal detection means 5, for example,
The cycle of the reproduced CTL signal is detected, and if the reproduced CTL signal exceeding a predetermined cycle is input, it is determined that the decubitus CTL signal is gone and the area is a signal-free portion.

In this case, the switch means 6 is switched based on the determination output of the CTL eccentricity detection stage 5, and the F from the FG sensor (38, 39 in FIG.
The speed control signal of the speed control means 13 formed from the G and other signals is passed through the LPF 7 to the reel motor drive circuit 34 (3
5). The switch means 12 is controlled by the output from the system controller 14, and in the FF mode, the signal output of the FG sensor 39 provided in the T reel motor 31 is selected, and in the REV mode, the signal output of the FG sensor 39 provided in the 5IJ-reel motor 30 is selected. Select the signal output of the FG sensor. L
Providing the PF 7 after the switch means 6 has the effect of preventing sudden changes in the speed control signal input to the reel motor drive circuit 34 (35).

The operation of the block diagram of the present invention shown in FIG. 2 will be explained in detail with reference to the operational diagram shown in FIG. 3. (al is a graph showing the tape winding diameter and tape speed when reel 20 (21) is rotated at - constant rotation speed. The rotation speed of reel 20 (21) is w (rad/5ec) ( = constant), and its winding diameter is r
(m), then tape speed vt (rrV/5ec)
(=reel circumferential speed) is expressed by the following formula.

vt=r-W According to (1), the reel winding diameter r and the tape speed vt are proportional.

(Figure b1 shows an example to which the present invention is applied (a tape in which signals are recorded from the beginning to the middle of the tape). It shows the relationship between the winding diameter of the S reel and the tape speed in REV mode. RE
At the start of V, there is no signal recording section, so 5I
The tape speed increases in proportion to the winding diameter ζ of the J-rule 21.

When the signal recording portion is reached, the tape speed is controlled by the reproduction CTL signal.

Figure (C) shows the relationship between the winding diameter of the Tl-ru and the tape speed when this tape is in the FF mode. At the start of FF, the reprinted CTL signal is normally reproduced, so the tape speed is controlled by this signal. When the tape reaches the no-signal recording area, the TIJ-le motor 31 is controlled to rotate at a constant rotation speed. The tape speed at this time is slower than the tape speed when the tape speed is controlled by the reproduction CTL signal 1, so the tape speed is determined by the back tension given by the S IJ-le motor 30 and the T-IJ-le The speed is reduced by speed control using the FG signal. After that, after reaching the predetermined reel rotation speed controlled by the TIJ-LE FG signal, the TIJ-LE 2
The tape speed increases in proportion to the winding diameter.

Figure 4 is a specific circuit diagram of the present invention, and is the same as Figure 1.
The same reference numerals are given to the same parts and parts. 41 is a CTL signal input terminal, 42 and 43 are frequency-voltage conversion circuits (hereinafter referred to as f-v conversion circuits), and the seal is a retriggerable monomulti.

In this circuit diagram, the reproduction CTL input from the input terminal 41
Detection of the signal is performed by a retriggerable monomulti 44 that detects its period. The magnetic tape 1 normally runs (records,
The CTL signal cycle is set to be slightly longer than the CTL signal period that is reproduced during playback speed). Therefore, CT
The period during which the L signal is reproduced at the above predetermined period, IJ) I
The output required for J Garapuru Mono Multi remains the same, for example "l"
(It remains at the "high" level. Therefore, when the CTL signal reaches the unrecorded portion, the CTL signal is no longer reproduced at the above-mentioned predetermined period, so the output of the retriggerable mono multi I is inverted and the output reaches the "LOW" level. In this way, the CTL signal can be detected. On the other hand, the reproduced CTL signal input from the input terminal 41 is supplied to the f-v conversion circuit 42, where it is subjected to frequency-voltage conversion. f-
The v conversion circuit 42 has a conversion characteristic (FIG. 5) that outputs a voltage proportional to the input signal period.

For example, a high speed running mode (FF mode) command is issued from the system controller 14, and the T-reel motor 31 is started. After activation, when the reproduced CTL signal becomes shorter than the predetermined period (TλM), the switch means 6
The maximum output of the f-V conversion circuit 42 which receives the CTL signal as input is applied to the TIJ-le motor drive circuit 35. Thereafter, the f-v conversion circuit 4 is connected to the T IJ-le motor drive circuit 35 so that the tape travels at a predetermined value (TM).
The output of 2 is input.

The f-v conversion circuit 43 also has f-v conversion characteristics similar to those shown in FIG. Therefore, in the part where no signal is recorded, TIJ
- The T-reel motor 35 is controlled so that the output signal from the reel FG sensor 39 has a predetermined cycle.

FIG. 6 shows a schematic diagram of tape running according to another embodiment of the present invention. The same parts and parts as in FIG. 2 are given the same reference numerals. In this embodiment, one tape tension sensor 4 controls the back tension of the magnetic tape 11. 45 is a tape tension control circuit.

In this embodiment, tape tension control in the FF mode is similar to that shown in FIG. 2. In the REW mode, the supply side tension pin 26 is located on the exit side of the cylinder 17, so the tape tension value increases compared to the FF mode. Therefore, the tape tension control circuit 45 must change the tension setting value between the FF mode and the REW mode. To do this, a mode switching signal is input from the system controller 14 to the tape tension control circuit 45.

FIG. 7 is a specific circuit diagram of the tape tension control circuit 45 of the embodiment shown in FIG. 46 is an output signal input terminal from the tape tension sensor 4, 47 is an output signal input terminal from the system controller 14, a mallet is an output terminal of the tape tension control circuit 45, 49 is a buffer circuit,
50 is a phase lead compensation circuit, 51 is a phase lag compensation circuit, 5
2-54 are operational amplifiers, 55-61 are resistors, 62, 6
3 is a capacitor, 5 is a switch circuit, and 65 to 67 are reference power supplies.

The tape tension control circuit 45 inputs the output signal of the tape tension sensor 28 from the terminal 46, performs phase compensation, and then feeds it back to the reel motor drive circuit 34 (in FF mode).
Controls the back tension applied to the At this time, phase compensation is performed by inputting the output signal of the tape tension sensor 28 to the phase lead compensation circuit 50 and the phase lag compensation circuit 51.
Total compensation is performed by adding the outputs of each circuit 50 and 51.

Here, since the tension setting values are different between the FF mode and the REW mode, the reference voltage values of the phase lead compensation circuit 50 and the phase lag compensation circuit 51 are switched by the switch circuit 8 to accommodate this.

FIG. 8 is a specific circuit diagram of a winding torque control circuit according to another embodiment of the present invention, and the same reference numerals are given to parts and equivalent parts as in FIG. 4. 68 is a reference voltage switching means, 69 is a speed control means, 70 is a winding torque control circuit output terminal, and 71 and 72 are reference power sources.

In this embodiment, there are two f-v conversion circuits 42 and 43 in FIG.
It is a circuit diagram which realizes with one speed control means 69 (f-v conversion circuit). The target value (
For example, the voltage of the reference voltage @71) and the target value input to the speed control means 69 (for example,
This is realized by switching and inputting the reference voltage (voltage of the reference power supply 72) by the reference voltage switching means 68.

As described above, the reel motors 30, . 31
Although we have explained an example in which a reel motor is provided, by providing a transmission mechanism for each reel 21 and 22 and switching the transmission mechanism according to the running direction of the magnetic tape 1, it is possible to use one reel motor. This tape drive control device can be realized by FIG. 9 shows a block diagram of this embodiment.

In Fig. 9, the same places and equivalent parts as Fig. 2 have 1 peg.
A code is attached. 73 is a reel motor drive circuit, 74
75 is a rotational torque transmission mechanism and a reel motor.

In FIG. 2, each of the two reel motors 30 and 31 has a frequency generator sensor for detecting the rotation speed.

39 is provided, but in FIG. 9, it is provided directly on the two tape reels 21 and 22. (Not shown.) From these two frequency generator sensor outputs and control signals, the reel motor drive circuit 73 generates the reel torque control circuit 40 to generate the reel torque during high-speed running in the same manner as described above. to be applied. The rotational torque generated by the reel motor 75 is transmitted to one of the tape reels (21, 22) via the transmission mechanism 74, depending on the running direction of the tape 1. In this embodiment, high-speed running of the tape 1 can be realized with one reel motor 75.

Furthermore, another embodiment in which the winding torque is controlled finely will be described with reference to FIGS. 10 and 11.

FIG. 410 is a block diagram of another embodiment of the present invention.
The same parts and parts as in FIG. 8 and FIG. 8 are given the same reference numerals. 76, 77 are reference voltage switching circuits, 78-
81 is a reference power supply, 82 to 85 are switching circuits, 86° and 87 are current sources, wings, 89 are resistors 90, 91 are capacitors, 9
2 to 95 are diodes, and 96 and 97 are f-v conversion circuits.

When the CTL signal is normally reproduced by the CTL head 2, the switching circuits 82-85 are connected to the contacts shown. Therefore, the terminal voltage of the capacitor 90 is charged up to the voltage value of the reference power supply 78, which is f
This becomes the target value of the -v conversion circuit 96, and winding torque control is performed using the output signal of this fv conversion circuit 96. At this time, the target value of the other f-v conversion circuit 97 is the reference power supply 80.
The voltage value is . Here, when the CTL signal disappears, the switching circuits 82 to 85 are connected to contacts opposite to those shown in the figure. Therefore, the torque control of the take-up reel motor is switched to the output signal of the fv conversion circuit 97. This f-
The terminal voltage of the capacitor 91 (capacitance value CI), which is the target value of the v conversion circuit 97, is determined by the current source 87 (iaE current value i1).
Because of this, the voltage decreases at a slope b. Therefore, f-
The output voltage of the v conversion circuit 97 also falls following the target value. By limiting this target value to a predetermined voltage (voltage value of reference power supply 81), the minimum value of the output voltage of fv conversion circuit 97 can be limited. This value determines the maximum tape speed at the maximum reel winding diameter on the winding side. A concrete illustration of the above operation is as shown in the operation explanatory diagram (b) in FIG. 11. This figure shows the winding diameter of the TIJ-rule, the output voltage e of the reference voltage switching circuit 77, and the tape speed when a tape recorded halfway is fast-forwarded. While the CTL signal is being reproduced, the tape speed runs at a predetermined value Qrrmx, and when the CTL signal disappears, the output voltage of the reference voltage switching circuit 77 decreases at a constant slope and is limited to a predetermined level. The tape speed gradually slows down when the CTL signal disappears, and after the output voltage of the reference voltage switching circuit 77 reaches a predetermined value, it increases in proportion to the T IJ-le winding diameter.

Conversely, the case where the CTL signal is not reproduced when the reel winding diameter is small and the CTL signal is reproduced from the middle is shown in Figure 11 (a).
). When the CTL signal is not reproduced, the tape speed increases in proportion to the reel winding diameter.

The switching circuits 82-85 are then connected to contacts opposite to those shown. Therefore, the terminal voltage of the capacitor 90, which is the target value of the f-v conversion circuit 96, is limited by the voltage value of the base power supply 79. Therefore, when the CTL signal is regenerated, winding torque control is performed using the output signal of the fv conversion circuit 96. At this time, the capacitor 90 (capacitance value at
) is charged by the current source (current value 5),
It rises with a slope b.

I Therefore, the output voltage of the f-v conversion circuit 96 also increases following the target value. This target value is set to a predetermined voltage (reference power supply 78).
By setting the limit at , the tape will run at that speed after reaching a predetermined tape speed.

According to this embodiment, there is an effect that the winding torque of the winding side reel motor can be smoothly switched depending on the presence or absence of the CTL signal. Also, depending on the amount of change in the winding torque, that is, the winding diameter of the winding side reel,
By varying the amount of current in step 7, there is an effect that finer torque control can be performed.

It is clear that this embodiment can be applied in the same manner as in FIG.

[Effects of the Invention] According to the present invention, when the tape is run at high speed by the high speed rotation of the take-up reel motor, if the regeneration control signal is lost, the rotation speed of the take-up reel motor is kept constant. By controlling the generated torque, the tape running speed can be limited to a predetermined value.Therefore, damage to the tape during high-speed running can be minimized.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a schematic diagram of a tape running system of a VTR, Fig. 3 is an explanatory diagram of the operation of the present invention, and Fig. 4 is a diagram of an embodiment of a specific circuit of the present invention. , Fig. 5 shows f-
v conversion characteristic diagram, FIG. 6 is a schematic tape running diagram of another embodiment of the present invention, FIG. 7 is a specific circuit diagram of the tape tension control circuit 45 of FIG. 6, and FIG. 8 is a diagram of another embodiment of the present invention. 9 is a block diagram of another embodiment of the present invention, FIG. 10 is a block diagram of another embodiment of the present invention, and FIG. is an explanatory diagram of its operation. 4...Control head 4...Speed control means 5
...CTL signal detection means 6...Switch means 7.
...L P F 12...Switch means 13...Speed control means 14...System controller 15...Resistor 16...Capacitor 21...S reel 22...T reel garden, 31. ... Reel motor 34, 35... Reel motor drive circuit 36.37.
...Switching means A, 39...FG sensor 40.
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Claims (1)

[Claims] 1. The tape (1
) includes a control head (2) for reproducing control signals recorded on the tape (1) at regular intervals, and a frequency power generator provided on the pair of tape reels (21, 22). machine sensor (38, 39), a system controller (14) that generates a signal to control the running direction of the tape (1), the control signal, and an output signal from the frequency generator sensor (38, 39). , a winding torque control circuit (40) which inputs a control signal from the system controller (14), and an output signal of the winding torque control circuit (40) according to the running direction of the tape (1). Reel motors (30, 31) that drive the pair of tape reels (21, 22)
) a switching means (36 or 37) for inputting an input to one of the reel motor drive circuits (34, 35). 2. The tape (
1) includes at least one tape tension sensor (28 or 29) and a tape tension control circuit (32 or 29) that receives an output signal from the at least one tape tension sensor (28 or 29). 33), a switching means for switching the output signal of the at least one tape tension control circuit (32 or 33) and the output signal of the winding torque control circuit (40) according to the running direction of the tape (1). (36, 37) Claim 1 comprising:
The tape drive control device described in . 3. The winding torque control circuit (40) includes a control signal detection means (5) for detecting whether or not a predetermined control signal is being reproduced from the control head (2), and a first speed control means (4) that outputs a signal at a high level, and an output signal of one of the two frequency generator sensors (38, 39), depending on the running direction of the tape (1). a first switch means (12) to select and a first switch means (12) to select;
a second speed control means (13) that outputs a signal with a level corresponding to the period of the output signal of (2); 3. The tape drive control device according to claim 1, further comprising second switch means (6) for selecting an output signal of the control means (4, 13). 4. The winding torque control circuit (40) includes a control signal detection means (5) for detecting whether a predetermined control signal is being reproduced from the control head (2), and the two frequency generator sensors. (38, 39) according to the running direction of the tape (1); and an output signal of the first switch means (12). a second switch means (6) for selecting the control signal according to the output signal of the control signal detection means (5); and a level corresponding to the period of the output signal of the second switch means (6). a speed control means (69) for outputting a signal; and a reference voltage switching means (68) for switching and inputting a first reference power source (71) and a second reference power source (72) to the speed control means (69). ), and the tape drive control device according to claim 2 . 5. Between the pair of tape reels (21, 22), the tape (
1) includes a control head (2) for reproducing control signals recorded on the tape (1) at a constant cycle, and a frequency set on the pair of tape reels (21, 22). A generator sensor (38, 39), a system controller (14) that generates a signal to control the running direction of the tape (1), a system controller (14) that generates a signal for controlling the running direction of the tape (1), and a system controller that generates a signal from the control signal and two frequency generator sensors (38, 39). A winding torque control circuit (40) that receives the output signal and a control signal from the system controller (14); and a reel motor drive circuit (73) that receives the output signal of the winding torque control circuit (40). and a reel motor (72) driven by the reel motor drive circuit (73), and the rotational torque of the reel motor (72) is controlled by the tape (1).
) according to the running direction of the two tape reels (21
, 22). 6. The winding torque control circuit (40) includes a control signal detection means (5) for detecting whether or not a predetermined control signal is being reproduced from the control head (2), and a first frequency-voltage converter circuit (96) that outputs a signal at a high level, and an output signal of one of the two frequency generator sensors (38, 39) in the running direction of the tape (1). a first switch means (12) that is selected accordingly, and a second frequency-voltage conversion circuit (97) that outputs a signal with a level that corresponds to the period of the output signal of the first switch means (12).
and a first reference voltage switching circuit (76) that switches and inputs a first reference power source (78) and a second reference power source (79) to the first frequency-voltage conversion circuit (96); A third reference power supply (80) is connected to the second frequency-voltage conversion circuit (97).
) and the fourth reference power source (81).
The reference voltage switching circuit (77) and the output signal of the control signal detection means (5) cause the first frequency to be
The output signal of the voltage conversion circuit (96) and the second frequency -
3. The tape drive control device according to claim 1, further comprising a second switch means (6) for switching the output signal of the voltage conversion circuit (97). 7. The first or second reference voltage switching circuit (76
, 77) is a capacitor (90, 91) and a current source (8) that charges and discharges the capacitor (90, 91).
6, 87) and resistors (88, 89), a third switching circuit (82, 84) that switches the charging/discharging according to the output signal of the control signal detection means (5), and the first reference power source ( 78) with the cathode connected.
a diode (93), and a second reference power source (79) whose anode is connected to the first reference power source (79).
the anode of the first diode (93) and the second diode (94) by the output signal of the control signal detection means (5).
Select the cathode of the diode and connect the capacitor (9
7. The tape drive control device according to claim 6, further comprising a fourth switching circuit (83, 85) connected to the tape drive controller (83, 85).