JPH03260946A - Tape feeder - Google Patents

Abstract

PURPOSE:To perform the intermittent reproduction of recording data without accompanying by the change of a mechanism state in fast access and limitation on feed speed by making tape speed follow the cyclical change of a targeted value. CONSTITUTION:A speed error calculation circuit 8 outputs an error between tape speed information obtained at a tape speed detecting meanas 5 and the targeted value of the tape speed information that is the output of a target setting circuit 7. A motor driving circuit 4 takes up a tape 1 by generating torque to eliminate a speed error in a motor 3 corresponding to the output of the calculation circuit 8. Furthermore, the circuit 7 makes the tape speed follow the cyclical change of the targeted value by changing the targeted value of the tape speed information sufficient late compared with the reply of tape speed control based on the command signal of an acceleration/deceleration command circuit 6. Therefore, it is possible to perform the intermittent reproducing operation of the recording data by including the tape speed capable of performing the reproduction by an information reproducing means 9 when the cyclical change of the tape speed occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape running device used in video tape recorders (hereinafter referred to as VTRs), digital tape recorders, and the like.

BACKGROUND OF THE INVENTION In recent years, recording and reproducing devices using tape media (for example, VTRs) have become popular.
), there is a growing demand for high-speed access as well as longer recording times.

Regarding high-speed access, an important factor is increasing tape running speed along with data reproduction.

A conventional tape running device is, for example, disclosed in Japanese Patent Application Laid-open No. 61-1907.
This method is disclosed in Japanese Patent Publication No. 45, Japanese Patent Application Laid-open No. 188791/1983, and the like.

An example of a conventional tape running device will be described below.

FIG. 6 shows a block diagram of a conventional tape running device.

In FIG. 6, 100 is a speed command terminal for commanding the winding speed, 101 is a magnetic tape, 102 and 103 are posts that form a running path for the magnetic tape 101, and 104
．． 105 is a reel for winding the magnetic tape 101;
06 is a motor that drives the reel 104, 107, 108
109 is a period sum calculation circuit that adds and outputs the period information of the output pulses of the pulse generators 107 and 108, and 110 is a speed command. terminal 10
Target value and period sum calculation circuit 10 according to the command speed from 0
The rotational force corresponding to the amount of error with the input value from 9 is applied to motor 1.
06 is a drive circuit that generates a signal, 111 is a magnetic tape 101
112 is a rotating cylinder for winding the magnetic tape 101 to rotate the magnetic tape 111; 113 is a rotating cylinder 11;
1t4 is a pulse generator that outputs pulses with a frequency proportional to the rotational speed of the rotating cylinder 112, 115 is an FV converter that generates a voltage corresponding to the frequency of the pulse generator 114, and 116 is a speed command terminal. 1
117 is an information reproducing circuit that amplifies and shapes the output of the magnetic herad 111. It is a circuit.

FIG. 7 is a diagram showing the movement of the magnetic tape and the helad gap during high-speed running in the tape running device of FIG. 6.

In FIG. 7, 201 is a magnetic tape, 202 is a tape running direction during recording, 203 is a track where data is recorded, 204 is a head gap formed by the magnetic head 111, 205 is position information recording data, and 206 is during high-speed fast forwarding. This is a head trace.

The operation of the tape running device configured as described above will be explained below. The pulse period of the pulse generators 107, 108 varies in proportion to the rotation period of the reels 104, 105, respectively. The period sum calculation circuit 109 obtains approximate tape speed information by calculating the sum of the pulse periods of the pulse generators 107 and 108. The drive circuit 110 receives the tape speed information of the period sum calculation circuit 109 and the speed command terminal 100.
The rotational force is generated in the motor 10B according to the amount of error between the command speed and the value corresponding to the command speed. That is, a tape speed control loop is formed, and the magnetic tape 101 is wound onto the reel 104 at a tape speed corresponding to the command from the speed command terminal 100. On the other hand, the pulse frequency of the pulse detector 114 changes in proportion to the rotation speed of the rotary cylinder 112, and F
V converter 115 generates a voltage proportional to the pulse frequency. The drive circuit 116 causes the motor 113 to generate rotational force according to the amount of error between the output voltage of the F, V converter 115 and the voltage corresponding to the command speed from the speed command terminal 100. In other words, a rotational speed control loop is formed, and the rotating cylinder 112 rotates at a speed corresponding to the command from the speed command terminal 100.

Next, the relationship between the tape speed and the moving speed of the magnetic head will be explained. Head trace 20 during high-speed fast forwarding in Figure 7
At B, track 203 at its trace speed
By setting the rotation speed of the rotary cylinder 112 so that the longitudinal component of the data matches the tracing speed at the time of recording, information such as the position information 205 can be partially reproduced at the same transfer speed as at the time of recording. Therefore, data is reproduced by changing the number of revolutions of the rotary cylinder 112 according to the tape speed set by the speed command terminal 100 and making the velocity component of the magnetic head 111 in the track direction equal to that during recording.

In addition, as another example of high-speed access,
In Japanese Patent No. 791, a system is proposed in which intermittent data reproduction is performed while switching between a high-speed running state and a normal reproduction state.

Problems to be Solved by the Invention However, in the above configuration, since the data reproduction frequency is made to match the recording frequency,
As tape running speed increases, depending on the running direction, it becomes necessary to stop or reverse the rotating head, which is difficult to achieve.
The upper limit of running speed is restricted. In addition, a method that performs intermittent data playback while switching between high-speed running state and normal playback -7= state involves switching between running by the capstan and running by the reel, which reduces the effect of high-speed access. It had a point.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to realize a tape running device that can perform intermittent playback of recorded data in a first configuration without changing the mechanism state or limiting the running speed during high-speed access. That is.

Furthermore, in addition to the purpose of the first configuration, the second configuration is intended to perform intermittent retention and output of reproduced data.

Means for Solving the Problems In order to achieve the above object, the tape running device of the present invention has a first configuration that includes two parts for winding and feeding the tape.
an information reproducing means for reproducing and outputting information on the tape; a motor for driving at least one of the reels; a tape speed detecting means for directly or indirectly detecting the running speed of the tape; an acceleration/deceleration command circuit that alternately outputs an acceleration command signal and a deceleration command signal in cycles; and a target value of the output of the tape speed detecting means is changed based on the command signal of the acceleration/deceleration command circuit, and the information is reproduced. a target setting circuit that outputs an output including target values for both a reproducible tape speed and a non-reproducible tape speed of the means; and an error amount between the output value of the target setting circuit and the output value of the tape speed detecting means. and a motor drive circuit that causes the motor to generate rotational force in accordance with the output of the speed error calculation circuit.

Furthermore, as a second configuration, in addition to the first configuration,
A hold circuit is provided for holding and outputting the output information of the information reproducing means in response to the end of the deceleration command of the acceleration/deceleration command circuit or the start of the acceleration command.

In the tape running device of the present invention, with the above-described first configuration, the speed error calculation circuit detects the error between the tape speed information obtained by the tape speed detection means and the target value of the tape speed information that is the output of the target setting circuit. Output. The motor drive circuit generates a rotational force that eliminates the speed error in the motor according to the output of the speed error calculation circuit, and winds up the tape. That is, the tape is wound at a tape speed corresponding to the output of the target setting circuit, forming a tape speed control loop.

Furthermore, the target setting circuit changes the target value of the tape speed information sufficiently slowly compared to the response of the tape speed control based on the command signal of the acceleration/deceleration command circuit, so that the tape speed can be adjusted to the periodic target change. Follow. Therefore, intermittent playback operations of recorded data are performed by including a tape speed at which the information playback means can play back during periodic changes in tape speed.

Furthermore, in the second configuration, in addition to the operation of the first configuration, the hold circuit holds and outputs the output information of the information reproducing means in response to the end of the deceleration command or the start of the acceleration command of the acceleration/deceleration command circuit. Even when the tape speed is such that data cannot be reproduced by the information reproducing means, the data reproduced last time can be output.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a tape running device in a first embodiment of the present invention.

In Fig. 1, 1 is a magnetic tape, la and lb are posts that form a traveling path for the magnetic tape 1, 2a+2b are reels for winding the magnetic tape 1, 3 is a motor that drives the reel 2a, and 4 is an input value. 5 is a tape speed detection means; 51 is a motor drive circuit that generates rotational force in the motor 3 according to the
．． 52 is a pulse generator that outputs pulses with a frequency proportional to the rotational speed of the reels 2a and 2b, respectively; 53 is a period sum calculation circuit that adds period information of the output pulses of the pulse generators 51 and 52 and outputs the sum. The tape speed detection means 5 is composed of pulse generators 51 and 52 and a period sum calculation circuit 53. 6 is an acceleration/deceleration command circuit that alternately outputs an acceleration command signal and a deceleration command signal at a predetermined period; 7 is a period sum calculation circuit 53 when the output of the acceleration/deceleration command circuit 6 is an acceleration command signal;
Output 11- is a target setting circuit that decreases the target value and increases the target value when the deceleration command signal is issued; 8 is the amount of error between the output value of the target setting circuit 7 and the output value of the period sum calculation circuit 53; 9 is an information reproducing means, 91 is a magnetic head for reading data on the tape, 92 is a rotating cylinder for winding the magnetic tape 1 and rotating the magnetic head 91; 93 is a cylinder driving means for rotating the rotary cylinder 92 at a predetermined rotation speed; 94 is an information reproducing circuit that amplifies and shapes the output of the magnetic head. The information reproducing means 9 includes a magnetic head 91, a rotating cylinder 92, a cylinder driving means 93, and an information reproducing circuit 94.

The operation of the tape running device of the first embodiment configured as described above will be explained below.

The pulse periods of the pulse generators 51, 52 change in proportion to the rotation periods of the reels 2a, 2b, respectively. The period sum calculation circuit 53 obtains approximate tape speed information by calculating the sum of the pulse periods of the pulse generators 51 and 52. Here, it will be shown that the sum of the pulse periods of pulse generators 512 and 52 provides approximate tape speed information. The radius of both reel hubs is Ro (mm), the reel radius of the take-up side and the supply side including the magnetic tape 1 is Rt + Rs (mm), and the signal periods of the pulse generators 51 and 52 are Tt and Ts (sec), respectively. , the number of teeth of both pulse generators is Zl, the running speed of the magnetic tape 1 is V (mm/5ec), and the thickness of the magnetic tape 1 is W (m
m), the total length of the magnetic tape 1 is L (mm),
The area occupied by the magnetic tape 1 viewed from the side of the winding is S (
mm2) and ignoring the travel path of the magnetic tape 1,
The following relationship holds.

S=(πXRt2-πXRo')+(πX R52-π
XRo2)=LXW...
・(1) From formula (1), Rt'+R52=(LXW/rr)+2XRo
”(2) On the other hand, the relationship between T t + T s and V is Tt
'=2XπXRt/ (VXZ) −(3)Ts
=2XyrXRs/ (VXZ)” (4), so Rt=TtXVXZ/ (2×π) −(5)R
s=TsXVXZ/ (2Xπ) ”・(6
) holds true. Substituting equations (5) and (6) into equation (2) and sorting it out gives the following equation, and if the value of T t ''+T s 2 is controlled to be constant, ■ becomes constant.

By the way, when the value of Tt+Ts is controlled to be constant, an error occurs in the tape speed V. To calculate the error E (%) as a function of Rt, for example, each value of a 120-minute VHS video tape is L = 24eX103 (mm), W = 19X10-"
(mm), Ro = Rt = 13 (mm), the maximum tape speed error of the same tape E = -
17.5 (%), and by setting the target value of tape speed to the optimal value, the error in tape speed relative to the target is approximately ±9
It can be kept within %.

That is, the pulse period 14- of the pulse generators 51 and 52 It can be seen that the sum of the numbers gives approximate tape speed information.

As described above, approximate tape speed information is obtained from the period sum calculation circuit 53. Therefore, the speed error calculation circuit 8 outputs the amount of error between the output value of the period sum calculation circuit 53 and the output value of the target setting circuit 7 to the motor drive circuit 4. Motor drive circuit 4
The motor 3 generates a rotational force that eliminates the speed error in accordance with the error amount of the speed error calculation circuit 8, and winds up the tape 1.

That is, the tape is wound at a tape speed corresponding to the output of the target setting circuit 7, forming a tape speed control loop. On the other hand, the acceleration/deceleration command circuit 6 changes the acceleration command and the deceleration command at a sufficiently slower period than the response of the tape speed control. Based on the command signal from the acceleration/deceleration command circuit 6, the target setting circuit 7 sets the target value of the tape speed information in the direction in which the tape speed increases in the case of an acceleration command, and in the direction in which the tape speed decreases in the case of a deceleration command. change. In other words, the tape speed follows periodic changes in the target value. Also,
Since the cylinder driving means 93 rotates the rotary cylinder 92 at a predetermined number of rotations, the magnetic spatula 15 - 91 scans the recording surface of the magnetic tape 1 .
Adjust the data playback conditions. The information reproducing circuit 94 outputs the information obtained by the magnetic head 91 through processing such as amplification and shaping. Therefore, by including a tape speed at which data can be reproduced among periodic changes in tape speed, intermittent reproduction of recorded data becomes possible.

Furthermore, regarding the second embodiment of the present invention, FIGS.
This will be explained with reference to the figures.

FIG. 2 is a block diagram of a tape running device according to a second embodiment of the present invention, and FIG. 3 is a signal waveform diagram of each part of the tape running device.

In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals, and detailed explanations will be omitted. A hold circuit 10 holds and outputs the output information of the information reproducing means 9 at the start of the acceleration command from the acceleration/deceleration command circuit 6.

In Fig. 3, (A) is the output signal of the acceleration/deceleration command circuit 6 where the H level corresponds to an acceleration command and the L level corresponds to a deceleration command, (B) is the output signal of the target setting circuit 7, and (C) is the information reproduction signal. The output signal of means 9, (D) is the output signal of the hold circuit.

The operation of the tape running device of the second embodiment configured as described above will be explained below.

The four pulse periods of the pulse generators 51 and 52 each change in proportion to the rotation period of the reel 2 al 2 b.

The period sum calculation circuit 53 obtains the approximate tape speed information shown in the first embodiment by calculating the sum of the pulse periods of the pulse generators 51 and 52.

Therefore, the speed error calculation circuit 8 outputs the amount of error between the output value of the period sum calculation circuit 53 and the output value of the target setting circuit 7 to the motor drive circuit 4. The motor drive circuit 4 causes the motor 3 to generate a rotational force that eliminates the speed error in accordance with the error amount of the speed error calculation circuit 8, and winds up the tape 1. That is, the tape 1 is wound at a tape speed corresponding to the output of the target setting circuit 7, forming a tape speed control loop. −
On the other hand, the acceleration/deceleration command circuit 6 changes the acceleration command and the deceleration command as shown in FIG. 3(A) at a sufficiently slower period than the response of the tape speed control. The target setting circuit 7 is an acceleration/deceleration command circuit 6
Based on the command signal of (Increase the target value of the period sum calculation circuit 53), and change the target value of the tape speed information. In other words,
The tape speed follows periodic changes in the target. However, in FIG. 3(B), the range of the target value B1 for the lower limit tape speed and the target value B3 for the upper limit tape speed is limited, and the sum of pulse periods greater than or equal to the target value B2 (corresponding to the target value B2) is limited. tape speed (less than or equal to the tape speed)
Information can be reproduced when . Further, since the cylinder driving means path 93 rotates the rotary cylinder 92 at a predetermined number of rotations, the magnetic head 91 scans the recording surface of the magnetic tape 1, thereby adjusting the data reproduction conditions. The information reproducing circuit 94 outputs the information obtained by the magnetic head 91 through processing such as amplification and shaping.

Therefore, by including a tape speed at which data can be reproduced among the periodic changes in tape speed, intermittent reproduction of recorded data becomes possible ((C) in FIG. 3, 17-1). Further, since the hold circuit 10 holds and outputs the output information of the information reproducing means 9 at the start of the acceleration command from the acceleration/deceleration command circuit 6 (when switching from the L level to the H level), the data reproducing means 9 cannot reproduce the data. Even when the tape speed is such that the data cannot be reproduced, the reproduction data can be continuously output by outputting the data from the previous reproduction ((D) in FIG. 3). Specific examples of the operation of the hold circuit 10 include recording and reproducing video data in a frame memory in a VTR and recording and reproducing time code data in a memory in a DAT.

Furthermore, an example of the configuration of the acceleration/deceleration command circuit and the target setting circuit in the first and second embodiments will be described with reference to FIGS. 4 and 5.

FIG. 4 is a block diagram of an example of the configuration of an acceleration/deceleration command circuit and a target setting circuit.

In FIG. 4, 61 is a clock circuit that outputs a clock signal, 62 is a counter circuit that counts in synchronization with the clock cycle of the clock circuit 61, and 63 is a HI3- level when an acceleration command is issued and a deceleration level according to the value of the counter circuit 62. A timing circuit 71 that outputs an L level when a command is issued counts the clock input in a decreasing direction when the output of the timing circuit 63 is an acceleration command (H level), and counts the clock input in an increasing direction when the output is a deceleration command (L level). 72 is an up/down counter circuit that outputs an H level when the output value of the up/down counter circuit 71 reaches a predetermined upper limit value or more; otherwise, an L level is output; 73 is an up/down counter a comparison circuit that outputs an H level when the output value of the circuit 71 reaches a predetermined lower limit value or less; otherwise, an L level; 74 an inverting circuit that inverts the output signal level of the timing circuit 63; 75; 76 is an AND circuit that outputs an H level only when the output of the comparison circuit 72 and the output of the timing circuit 63 are both H level, and 76 is an AND circuit that outputs an H level only when the output of the comparison circuit 73 and the output of the inverting circuit 74 are both H level. 77 is a clock circuit that outputs a clock signal for the up/down counter circuit 71; 78 is a clock circuit that outputs a clock signal for the up/down counter circuit 71; 78 is an H level when the output of any one of the clock circuit 77, AND circuit 76, and 79 is a gate circuit that determines the clock supply to the up/down counter circuit 71;
It is composed of an inverting circuit 74, AND circuits 75 and 76, and an OR circuit 78.

FIG. 5 is a signal waveform diagram of each part of the target setting circuit 7.

In FIG. 5, (E) is the output signal of the acceleration/deceleration command circuit 6, (F) is the output signal of the clock circuit 77, (G) is the output signal of the up/down counter circuit 71, and (H) is the output signal of the AND circuit 75. Output signal, (1) is AND circuit 76
(J) is the output signal of the OR circuit 78.

The operations of the acceleration/deceleration command circuit and target setting circuit configured as described above will be explained below.

The counter circuit 62 continues counting operation in synchronization with the clock cycle of the clock generator 61. The timing circuit 63 continues to output the H level corresponding to the acceleration command when the count value of the counter circuit 62 reaches a predetermined value, and also responds to the deceleration command when the count value reaches another predetermined value. By continuing to output the L level, a signal as shown in FIG. 5(E) is output. First, if the output value of the up-down counter circuit 71 is neither above the upper limit value nor below the lower limit value, the outputs of the comparison circuits 72 and 73 are at L level, so the outputs of the AND circuits 75 and 76 are L
level. The output of the OR circuit 78 at this time is the output signal of the shoes 9 circuit 77, so the up/down counter circuit 71 counts in the decreasing direction when an acceleration command is issued (section 1 in Figure 5), and when the deceleration command is issued. 5), the target value of the period sum calculation circuit 53 of FIGS. 1 and 2 is changed in an increasing direction. Next, when the output value of the up/down counter circuit 71 reaches the lower limit value or less during an acceleration command, the AND circuit 76 outputs the H level, so the OR circuit 78 also continues to output the H level, and the up/down counter circuit 71 outputs the H level. The counting operation is in a stopped state (section (opening) in FIG. 5). Furthermore, when the output value of the up/down counter circuit 71 reaches the upper limit value or more during a deceleration command, the AND circuit 75 outputs an H level, so the OR circuit 78
continues to output H level, and the up/down counter circuit 7
The counting operation of 1 is stopped (section 2 in FIG. 5). In other words, the period sum calculation circuit 5 of FIGS. 1 and 2
The target value of No. 3 ((G) in FIG. 5) changes periodically between a predetermined upper limit value and lower limit value in accordance with acceleration/deceleration commands.

As described above, in the first embodiment, by including a tape speed at which data can be reproduced among the periodic changes in tape speed, intermittent reproduction of recorded data becomes possible. Furthermore, in the second embodiment, even when the tape speed is such that data cannot be reproduced by the information reproducing means, reproduced data can be continuously output by storing and outputting data from the previous reproduction.

In addition, although the example showed an example of winding only in one direction,
Even if the reel driven by the motor 3 is replaced and winding is performed in the opposite direction, the effect of the invention will not change.

Further, in the embodiment, a tape running device 23 using the magnetic tape 1 was shown, but the effects of the invention will not change even if a tape capable of recording and reproducing by, for example, light is used.

Further, in the embodiment, the tape speed detecting means 5 is configured to output an output corresponding to the sum of the reel rotation periods, but it is also possible to obtain tape speed information by reproducing information recorded on the tape, or to obtain tape speed information by reproducing information recorded on the tape. Needless to say, any configuration that outputs information corresponding to the tape speed may be used, such as providing an idler on the path to obtain rotation speed information, or using the reel rotation speed as indirect tape speed information. Further, in the embodiment, the information reproducing means 9 is configured by a rotating magnetic head, but the effect of the invention will not change if the information reproducing unit 9 is configured to be configured by a fixed magnetic head. Furthermore,
In the first and second embodiments, the period sum calculation circuit 53
．． Acceleration/deceleration command circuit 6. Goal setting circuit 7. It is obvious that the speed error calculation circuit 8 and the like can be realized by software using a computer.

Effects of the Invention As described above, the present invention has, as a first configuration, two reels for winding and feeding out a tape, an information reproducing means for reproducing and outputting information on the tape, and a reel for reproducing and outputting information on the tape. a motor that drives at least one of the following; a tape speed detection means that directly or indirectly detects the running speed of the tape; and an acceleration/deceleration command circuit that alternately outputs an acceleration command signal and a deceleration command signal at a predetermined cycle; The target value of the output of the tape speed detection means is changed based on a command signal of the acceleration/deceleration command circuit, and includes target values for both a reproducible tape speed and an unreproducible tape speed of the information reproducing means. a target setting circuit that outputs an output; a speed error calculation circuit that outputs an error amount between the output value of the target setting circuit and the output value of the tape speed detection means; By providing a motor drive circuit that generates rotational force, the upper limit of the running speed is not limited, and without changing the mechanism state, it is possible to quickly change between a non-renewable high-speed running state and a reproducible running state.
It becomes possible to reproduce intermittent data while switching smoothly, and the implementation effect is significant.

Furthermore, as a second configuration, a hold circuit is provided in the first configuration for holding and outputting the output information of the information reproducing means in response to the end of the deceleration command or the start of the acceleration command of the acceleration/deceleration command circuit. In addition to the effects of the first configuration, even when the tape speed is such that data cannot be reproduced by the information reproducing means, continuous output of the reproduced data is possible by performing intermittent retention output of the reproduced data from the previous reproduction. The effects of its implementation are significant.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a tape running device in a first embodiment of the present invention, FIG. 2 is a block diagram of a tape running device in a second embodiment of the present invention, and FIG. 3 is a block diagram of a tape running device in a second embodiment of the present invention. Signal waveform diagram of each part for explaining the operation of the embodiment, No. 4
The figure is a detailed block diagram of the acceleration/deceleration command circuit and target setting circuit in the first and second embodiments, Figure 5 is a signal waveform diagram of each part to explain the operation of Figure 4, and Figure 6 is a conventional FIG. 7 is a block diagram of the tape running device shown in FIG. 6, showing the magnetic tape and head gear during high-speed running in FIG. 6. . . . Tape speed detection means, 6. Acceleration/deceleration command circuit, 7. Target setting circuit, 8. Speed error calculation circuit, 9.
Information reproducing means, 10... hold circuit.

Claims (4)

[Claims] (1) Two reels for winding and feeding out the tape, an information reproducing means for reproducing and outputting information on the tape, a motor for driving at least one of the reels, and controlling the running speed of the tape directly or indirectly. an acceleration/deceleration command circuit that alternately outputs an acceleration command signal and a deceleration command signal at a predetermined period; and an output of the tape speed detection means based on the command signal of the acceleration/deceleration command circuit. a target setting circuit that changes a target value of the information reproducing means and outputs a target value including a target value for both a reproducible tape speed and an unreproducible tape speed of the information reproducing means; The present invention is characterized by comprising: a speed error calculation circuit that outputs an error amount with respect to the output value of the speed detection means; and a motor drive circuit that generates rotational force in the motor in accordance with the output of the speed error calculation circuit. Tape running device. (2) The tape speed detection means includes two pulse generators that output pulse signals with a frequency depending on the rotational speed of each of the reels, and a period sum that outputs the sum of the pulse periods of each of the pulse generators. 2. The tape running device according to claim 1, further comprising a calculation circuit. (3) The tape running device according to claim 1 is provided with a hold circuit for holding and outputting the output information of the information reproducing means in response to the end of the deceleration command or the start of the acceleration command of the acceleration/deceleration command circuit. A tape running device featuring: (4) The tape speed detection means includes two pulse generators that output pulse signals with a frequency dependent on the rotational speed of each of the reels, and a period sum that outputs the sum of the pulse periods of each of the pulse generators. 2. The tape running device according to claim 1, further comprising a calculation circuit.