JPH04360087A - Use situation confirmation device for magnetic tape - Google Patents

Abstract

PURPOSE:To confirm the use situation of a record situation on a magnetic tape or the position of unrecorded state, the range, etc., over the whole tape. CONSTITUTION:A magnetic tape is wound on a winding reel 3a and a periodic signal recorded on the magnetic tape is detected with a reproduction block 203 of a CTL signal and whether or not the signal is present and the period are discriminated. At every time the variation is obtained, a tape traveling quantity is calculated by a tape traveling quantity calculation circuit 6 from the variation of a reel diameter and it is held in a memory 11. When the traveling of the tape is finished, the use situation is confirmed by displaying it.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape usage status confirmation device used in video tape recorders (hereinafter abbreviated as VTR) and the like.

0002

[Prior Art] In recent years, as a means of checking the outline of information recorded on a magnetic tape in a VTR, a cue signal recorded on the magnetic tape is searched at the start of recording, and after playing from the cue signal for a certain period of time, , a method is adopted in which the same thing is repeated and the usage status is recognized.

FIG. 17 is a block diagram showing an example of a magnetic tape usage status confirmation device for confirming an overview of information recorded on a magnetic tape in a conventional VTR. In this figure, a magnetic tape 101 is stretched between a supply reel (not shown) and a take-up reel 102, and is wound by a capstan motor 103 or a take-up reel motor 104. A capstan drive circuit 105 and a take-up reel drive circuit 106 are connected to these motors 103 and 104, respectively, and are driven under control from a controller 107. The controller 107 is supplied with the output of a reference signal generation circuit 108 that generates a clock signal that serves as a reference for time calculations. A control head 109 is also provided to detect a control signal (hereinafter abbreviated as CTL signal) recorded on the magnetic tape 101, and its output is CTL signal.
The signal is applied to a CTL signal discrimination circuit 111 via a TL signal reproducing amplifier 110. The CTL signal discrimination circuit 111 is a CT
By determining the duty ratio of the pulse of the L signal (hereinafter, the pulse of the CTL signal is referred to as a control pulse), the cue signal recorded at the start of recording is detected, and its output is sent to the controller 107. Given. Also provided are a reproducing head 112 for reproducing image information recorded on the magnetic tape 101, and a signal processing circuit 113 for processing the signal of its output and displaying it on a display (not shown). Here, the cue signal is a CTL signal that is recorded immediately after the start of recording in order to recognize the beginning of the image information to be recorded, and has a certain number of control pulses modulated with a duty different from normal.

The operation of such a conventional magnetic tape usage status confirmation device will be explained. When the confirmation operation starts,
First, after rewinding the magnetic tape 101 to the starting end, the controller 107 activates the take-up reel drive circuit 104 to start fast forwarding in order to detect a cue signal. When the cycle of the control signal obtained from the control head 109 via the CTL signal reproducing amplifier 110 changes, it is detected by the CTL signal discrimination circuit 111, and the controller 107
5 is operated to calculate time using the signal output from the reference signal generating circuit 108 as a clock signal, and reproduce image information for a certain period of time. After a certain period of time, controller 1
07 stops the capstan drive circuit 105, operates the take-up reel drive circuit 106, and starts fast forwarding in order to detect the next cue signal. In this way, the cue signal is detected and the image information is repeatedly reproduced for a certain period of time from the cue signal, thereby confirming what kind of information is recorded on the magnetic tape 101.

[0005]

[Problems to be Solved by the Invention] However, in the conventional method as described above, it is difficult to determine whether there is an unrecorded area on the magnetic tape, its position, and its range, or to set the standard recording mode or long-time recording mode to the recorded area. (hereinafter abbreviated as standard mode and 3x mode, respectively), etc., position, range, and other general usage conditions of the magnetic tape cannot be confirmed.

The invention as claimed in claims 1 to 6 of the present application solves the above-mentioned conventional problems, and aims to provide a magnetic tape usage status confirmation device that can easily check the usage status of the entire magnetic tape.

[0007]

[Means for Solving the Problems] The invention of claim 1 of the present application provides a reel for winding a magnetic tape, a drive means for running the magnetic tape, and a winder for detecting the winding diameter of the magnetic tape wound on the reel. a diameter detecting means; a traveling distance calculating means for calculating the traveling distance of the magnetic tape from a change in the tape winding diameter output output from the winding diameter detecting means; a reproducing means for reproducing a periodic signal recorded on the magnetic tape; Discrimination means for determining the presence or absence and period of an output signal of the means, and operating the running amount calculating means every time there is a change; and a memory for storing the output of the determining means and the magnetic tape running amount obtained from the running amount calculating means. , and display means for displaying information stored in the memory.

The invention according to claim 2 of the present application includes: a reel for winding a magnetic tape; a driving means for running the magnetic tape;
a winding diameter detecting means for detecting the winding diameter of the magnetic tape wound on the reel; a running amount calculating means for calculating the traveling distance of the magnetic tape from a change in the tape winding diameter output output from the winding diameter detecting means; a reproducing means for reproducing the periodic signal recorded on the tape; a counting means for detecting the recording time of the magnetic tape by counting the periodic signal outputted by the reproducing means;
a selection means for determining the presence or absence and period of the output signal of the reproducing means and selectively operating either the counting means or the traveling distance calculating means; The present invention is characterized by comprising a memory for storing the magnetic tape running amount and a display means for displaying the information stored in the memory.

Further, the invention according to claim 3 of the present application provides a reel for winding a magnetic tape, a drive means for running the magnetic tape, a winding diameter detecting means for detecting the winding diameter of the magnetic tape wound on the reel, A running distance calculating means for calculating the running distance of the magnetic tape from a change in the tape winding diameter output output from the winding diameter detecting means, a reproducing means for reproducing the periodic signal recorded on the magnetic tape, and an output signal of the reproducing means. Discrimination means for determining the presence or absence and cycle and operating the traveling distance calculation means every time the change occurs; recording means for generating information for identifying recorded information and recording it on a magnetic tape; and identification information from the output of the reproduction means. a memory for storing the output of the discriminating means, the magnetic tape running amount obtained from the running amount calculating means and the output of the detecting means, and a display means for displaying the information stored in the memory. It is characterized by comprising:

[0010] Furthermore, the invention according to claim 4 of the present application is characterized in that the recording means has a recording date and time generating means for generating a recording date and time signal, and is a recording date and time recording means for recording the signal. .

The invention of claim 5 of the present application also provides a take-up reel for winding a magnetic tape, a supply reel for feeding out the magnetic tape, a driving means for running the magnetic tape, and a magnetic tape wound on the take-up reel. A first winding diameter detecting means for detecting the winding diameter of the tape, a second winding diameter detecting means for detecting the winding diameter of the magnetic tape wound on the supply reel, and an output of the first winding diameter detecting means. a running amount calculating means for calculating the running amount of the magnetic tape from the change and the change in the output of the second winding diameter detecting means;
a reproduction means for reproducing a periodic signal recorded on a magnetic tape; a determination means for determining the presence or absence of an output signal of the reproduction means and its period; and a determination means for operating a travel amount calculation means every time the output signal changes; The present invention is characterized by comprising a memory for storing the amount of magnetic tape travel obtained by the amount calculation means, and a display means for displaying the information stored in the memory.

Furthermore, in the invention of claim 6 of the present application, the running amount calculation means is a first winding amount calculating means for calculating the running amount of the magnetic tape from a change in the output of the tape winding diameter output from the first winding diameter detecting means.
a second tape running amount calculation circuit that calculates the running amount of the magnetic tape from a change in the tape winding diameter output from the second winding diameter detecting means; The vehicle is characterized by comprising an averaging circuit that averages the outputs of the travel distance calculation circuit.

[0013]

[Operation] In the invention of claim 1 of the present application having such characteristics, the magnetic tape is caused to run on the take-up reel by the drive means, and based on the presence or absence of the output signal of the playback means obtained at that time and the change in the period, By operating the traveling distance calculation means, when a signal is recorded on the magnetic tape, the mode, recording time, and presence or absence of the signal are determined and stored in the memory. By repeating this operation every time the output of the determining means changes, the overall usage status of the magnetic tape can be recognized and displayed on the display means.

Further, in the invention of claim 2 of the present application, the periodic signal obtained from the reproducing means is counted when checking the usage status, and when the periodic signal is being reproduced, the traveling distance of the magnetic tape is calculated based on the counted value. At the same time, if a periodic signal is not recorded, the running amount is calculated by the running amount calculation means, so that the usage status of the entire magnetic tape can be recognized. In this way, the recording time can be accurately calculated and displayed.

Furthermore, in the invention of claims 3 and 4 of the present application, a signal for identifying recorded information is recorded on the magnetic tape in advance during recording, and when checking the usage status of the magnetic tape, this signal is read out and stored in the memory at the same time. The recorded information can be displayed on a display means.

Furthermore, the invention of claims 6 and 7 of the present application provides a second winding diameter detecting means on the supply reel side in addition to the take-up reel, and the traveling amount calculating means detects the winding diameter of these winding diameter detecting means. By averaging the travel distance obtained from the amount of change in , the accurate travel distance can be calculated and displayed.

[0017]

【Example】

(Example 1) A first example of the present application will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the first embodiment. In this figure, a magnetic tape 1 is wound around a cylinder 2 and stretched between a take-up reel 3a and a supply reel 3b. Take-up reel 3a, supply reel 3b
are driven by a take-up reel motor 13a and a supply reel motor 13b, respectively. Take-up side reel drive circuit 14
a rotates the take-up reel 3a by driving the take-up reel motor 13a, and the supply reel drive circuit 14b rotates the supply reel 3b by driving the supply reel motor 13b. The controller 15 issues a command to check the usage status of the magnetic tape 1, and the take-up reel drive circuit 14a
, controls the supply side reel drive circuit 14b to rewind the magnetic tape 1 to the beginning and fast forward to the end. In the following description, it is assumed that the tape speed is always constant during fast forwarding.

The period detector 4 outputs a signal having a period proportional to the rotation period of the take-up reel 3a to the reel diameter detection circuit 5. The reel winding diameter detection circuit 5 determines the winding diameter (hereinafter referred to as the reel winding diameter) of the magnetic tape 1 wound on the take-up reel 3a based on the change in the period of the output signal of the period detector 4. Magnetic tape 1 wound on a reel
Refers to the winding diameter of ) is calculated and output to the tape running amount calculation circuit 6. Here, a method for calculating the winding diameter of the take-up reel 3a in the reel winding diameter detection circuit 5 from a change in the period of the output signal of the period detector 4 will be explained. First, if the winding diameter of the take-up reel 3a is r (unit, m) and the tape speed is V (unit, m/s), then the rotation period T of the take-up reel 3a is
r (unit, s) is expressed by the following formula (1). Tr=(2πr)/V...(1
) If the number of pulses detected by the period detector 4 during one rotation of the reel is N, then the period Tp (unit, s) of the output signal of the period detector 4 is expressed by the following equation (2). Tp=2πr/(N·V) (2) The winding diameter of the take-up reel 3a can be calculated from the period Tp of the output signal of the period detector 4 using the formula (3) which is a modification of the formula (2). r=(N・V・Tp)/2π...(3)

0
On the other hand, the control head 7 detects the CTL signal recorded on the magnetic tape 1, and its output is sent to the CTL signal reproducing amplifier 8. The CTL signal reproduction amplifier 8 amplifies the CTL signal, and its output is given to the CTL signal discrimination circuit 9. The CTL signal determination circuit 9 determines whether the magnetic tape 1 is unrecorded or recorded by determining the presence or absence of the CTL signal, and since the magnetic tape 1 is running at a constant speed, it determines whether the CTL signal is present or not. By calculating the cycle, the recording mode of the information recorded on the magnetic tape 1 is determined, and the two determination results are output to the tape travel amount calculation circuit 6 and the memory 11.

A method for determining the presence or absence of a CTL signal and its period will be explained assuming that the tape speed during fast forwarding is X times the tape speed during standard mode playback. The period of the CTL signal when reproducing information recorded in the standard mode on the magnetic tape 1 is, for example, 33.3 ms, so if the CTL signal is recorded, the CTL signal reproducing amplifier will be activated within 33.3/Xms. Utilizing that the output signal of 8 is inverted, the period during fast forwarding of the CTL signal recorded in 3x mode is 11.1/
The recording mode is determined by utilizing the fact that it is Xms.

The tape running amount calculating circuit 6 calculates the running amount of the magnetic tape 1 from the change in the output of the reel diameter detecting circuit 5. To do this, first, the take-up reel 3
The winding diameters of a are r0 and r1 (unit, m), respectively, and when the entire take-up reel 3a around which the magnetic tape 1 is wound is considered as one cylinder, the amount of change in the bottom area is ΔS (unit, m2). Then, ΔS is expressed by the following equation (4). ΔS=π|r12−r02| ...(
4) If the thickness of the magnetic tape 1 is t (unit, m), then
The running distance L (unit, m) of the magnetic tape 1 is expressed by equation (5), ΔS=t・L
...(5) And from equation (4) and equation (5), equation (6
) represents the tape running amount L. (Hereinafter, formula (6
) is the travel distance calculation formula. ) L=(π|r12-r02|)/t... (6) Furthermore, the tape running amount calculation circuit 6 calculates the tape running amount L calculated in this way to the detected recording mode if it is a recorded area. If it is an unrecorded area, the recordable time is calculated for each case of recording in standard mode and triple mode, and output to the memory 11. The conversion method to the unit of time is calculated using the fact that the running speed of the magnetic tape 1 is 33.35 mm per second in the standard mode and 11.12 mm per second in the triple mode. (In the following explanation, when the distance traveled by the magnetic tape 1 is referred to, it refers to the data obtained by converting the result obtained by the distance calculation formula (6) from the unit of length to the unit of time.)
The memory 11 stores the determination result of the CTL signal determination circuit 9, that is, the presence or absence of recording, the recording mode, and the output of the tape travel amount calculation circuit 6. When the command is issued, the data recorded in the memory 11 is displayed as described later at the end of fast forwarding of the magnetic tape 1.

Here, the take-up side reel motor 13a, the supply side reel motor 13b, and the take-up side reel drive circuit 14
a and the supply-side reel drive circuit 14b constitute a drive block 201 that runs the magnetic tape 1 in both forward and reverse directions, and the period detector 4 and the reel diameter detection circuit 5,
Winding diameter detection block 20 that detects the winding diameter of the take-up reel 3a
The control head 7 and the CTL signal reproduction amplifier 8 constitute a reproduction block 203 for reproducing the CTL signal.

The operation of the magnetic tape usage status confirmation device configured as described above will be explained with reference to FIGS. 2 and 3. When the controller 15 instructs to check the usage status of the magnetic tape 1, the drive block 201 is used to rewind the magnetic tape 1 to the starting end and then start fast forwarding.
The processing shown in FIGS. 2 and 3 is repeated until the end is reached. When the operation starts, first in the branch 30, the CTL signal determination circuit 9 detects a CTL signal to determine whether it is an unrecorded area or a recorded area. If it is determined that the area is an unrecorded area, it is determined in branch 31 whether or not it is the beginning of an unrecorded area. This is because the CTL signal discrimination circuit 9 always recognizes whether the area is a recorded area or an unrecorded area, so that when the CTL signal is interrupted, it can be determined that the area is at the beginning of an unrecorded area.

When it is determined that it is the beginning of the unrecorded area, the reel winding diameter detection circuit 5 detects the winding reel 3 in step 32.
The tape running amount calculating circuit 6 detects the winding diameter of a, and if r0 in the running amount calculation formula has already been detected, it is set as r1.
If it is not detected, it is stored as r0. Next, if it is determined in the branch 33 that it is the starting end of the magnetic tape 1, the process ends, and if it is not the starting end, the process proceeds to step 34.
Proceed to Step 3 and set the previously detected winding diameter r0
The travel distance of the magnetic tape 1 is calculated by substituting the winding diameter r1 detected in step 2 into the travel distance calculation formula. And the winding diameter r1 is r
Re-memorize as 0.

On the other hand, if it is determined in the branch 31 that it is not the beginning of the unrecorded area, the process proceeds to the branch 35 and it is determined whether or not the end of the magnetic tape 1 has been reached. If it is not the end, the process ends, and if the end is reached, the process proceeds to step 36, where the winding diameter of the take-up reel 3a is detected, and r1 in the running amount calculation formula is
shall be. Next, in step 37, the tape running amount calculation circuit 6 calculates the tape running amount by substituting the previously detected r0 and r1 detected in step 36 into the running amount calculation formula, and loads and stores it in the memory 11. After that, the stored data is displayed by the display circuit 12 in step 38.

On the other hand, if it is determined in branch 30 that the area is a recorded area, the process advances to branch 39 in FIG.
The CTL signal determination circuit 9 determines whether or not this is the beginning of the recorded area. This is because the CTL signal discrimination circuit 9 always recognizes whether the area is a recorded area or an unrecorded area, so if a CTL signal is detected in the middle of an unrecorded area, it can be determined that the area is at the beginning of a recorded area. If it is the beginning of the recorded area, the memory 11 stores the recording mode determined by the CTL signal determination circuit 9 in step 40, and the process proceeds to step 4.
1, the winding diameter r0 or r1 as in step 32
Detect. In the branch 42, it is determined whether or not it is the beginning of the magnetic tape 1, and if it is the beginning, the process ends. If it is not the starting end, the process proceeds to step 43, where the tape running distance is calculated and stored in the same manner as step 37, and then r1 is re-stored as r0.

If it is determined in the branch 39 that it is not the beginning of the recorded area, in the branch 44 the CTL
A signal discrimination circuit 9 discriminates a change in recording mode. If there is no change, it is determined in branch 45 whether or not the end of magnetic tape 1 has been reached. If it is not the end, the process ends, and if it is the end, the process proceeds to steps 46-48, where the winding diameter is detected in the same way as steps 36-38, and then the tape travel distance is calculated.
indicate. When a change in the recording mode is detected in the branch 44, the memory 11 stores the changed recording mode in step 49, and the take-up reel 3a is stored in step 50.
The winding diameter of the magnetic tape 1 is detected as r1 in the traveling distance calculation formula, and in step 51, the traveling distance of the magnetic tape 1 is calculated using the previously detected r0, and then r1 is re-stored as r0.

FIG. 4 is a diagram showing a display example of a cassette tape recorded in both the standard mode and the triple mode. The horizontal axis direction represents the position of the magnetic tape 1, and the left end of the horizontal axis means the starting end of the magnetic tape 1, and the right end means the ending end of the magnetic tape 1. The usage status of magnetic tape 1 shows that it has been recorded for 30 minutes in standard mode from the beginning, then 119 minutes in 3x mode, then 31 minutes in standard mode, and the rest was recorded in standard mode. 20 if
This indicates that when recording is performed in the 3x mode for 60 minutes, there is an unrecorded area sufficient for recording for 60 minutes. When such an operation to check the usage status of the tape is started, a CTL signal is obtained immediately after the magnetic tape is rewound and starts running, so the process proceeds from branches 30 to 39, and the recording mode is set in steps 40 and 41. The winding diameter r0 at that time is detected. In this way, the standard mode will be detected. and branches 30, 39, 44, 45
The process is repeated, and when the position where 30 minutes of recording ends is reached, steps 49 to 51 are executed from branches 30, 39, and 44.
When the recording mode is set to 3x mode, the running distance of the tape, that is, 30 minutes of standard mode recording is calculated and stored based on the winding diameter at that time. Similarly, 11 in 3x mode
Calculate the tape running distance for 9 minutes and 31 minutes in standard mode. When a non-recording position is reached, the process proceeds from branch 30 to 31, and then proceeds to steps 32 to 34, where the travel distance for 31 minutes is detected and stored. When the end of the unrecorded state is reached, the process proceeds to steps 36 to 38 and the final travel distance, that is, 2
0 minutes is calculated and displayed as shown in FIG. In this way, the recording status of the entire cassette tape can be displayed in fast forward mode.

As described above, according to this embodiment, the reel (take-up reel 3a) for winding the magnetic tape (magnetic tape 1)
), a driving means (driving block 201) for running the magnetic tape, and a winding diameter detecting means (winding diameter detecting block 202) for detecting the winding diameter of the magnetic tape wound on the reel.
a running amount calculation means (tape running amount calculation circuit 6) that calculates the running amount of the magnetic tape from a change in the output of the winding diameter detection means;
Reproducing means for reproducing periodic signals recorded on magnetic tape (
a regeneration block 203), a determination means (CTL signal determination circuit 9) that determines the presence or absence of an output signal of the regeneration means and its period, and a memory (memory 11) that stores the output of the determination means and the output of the traveling distance calculation means. By providing a display means (display circuit 12) that displays information stored in the memory, the existence, position, and range of unrecorded areas, as well as recorded areas, can be set in standard mode and 3x mode. You can check the usage status of the entire magnetic tape, such as recording mode, position, and range. In addition, a reel diameter detection circuit 5, a tape running amount calculation circuit 6, a CTL signal discrimination circuit 9, a memory 11
, the controller 15 can be realized using a microcomputer, and the effects of the invention will not change.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a block diagram of a magnetic tape usage status confirmation device showing a second embodiment of the present invention. In FIG. 5, a magnetic tape 1, a cylinder 2, a take-up reel 3a, a supply reel 3b, a period detector 4,
Reel winding diameter detection circuit 5, tape running amount calculation circuit 6, control head 7, CTL signal reproducing amplifier 8, CTL signal discrimination circuit 9, take-up side reel motor 13a, supply side reel motor 13b, take-up side reel drive circuit 14a, the supply side reel drive circuit 14b, and the controller 15 are the same as those shown in FIG. 1, and detailed description thereof will be omitted. The difference from the first embodiment is that a CTL signal counting circuit 10, a memory 111, and a display circuit 121 are newly provided.

The CTL signal counting circuit 10 operates only in the section in which the CTL signal is recorded in accordance with the output of the CTL signal discriminating circuit 9 for determining the presence or absence of the CTL signal, and counts the number of control pulses to determine the recorded area. The traveling distance of the magnetic tape 1 in is calculated. This takes advantage of the fact that the CTL signal normally has 30 control pulses per second, and outputs the amount of tape travel as data in units of time. The memory 111 stores the output of the CTL signal discrimination circuit 9, the output of the CTL signal counting circuit 10, and the output of the tape travel amount calculation circuit 6, and outputs them to the display circuit 121. The display circuit 121 displays the recorded data in the memory 111 as described below after the controller 15 issues a confirmation of the usage status of the magnetic tape 1 and after completing the search for the usage status of the magnetic tape 1.

[0032] Also, a take-up side reel motor 13a, a supply side reel motor 13b, and a take-up side reel drive circuit 14a.
and the supply side reel drive circuit 14b, the magnetic tape 1
The winding diameter detection block 202 detects the winding diameter of the take-up reel 3a from the period detector 4 and the reel winding diameter detection circuit 5.
A playback block 2 includes a control head 7 and a CTL signal playback amplifier 8 to play back a CTL signal.
03 is configured.

The operation of the magnetic tape usage status confirmation device configured as described above will be explained using the flowcharts shown in FIGS. 6 and 7. When the controller 15 instructs to check the usage status of the magnetic tape 1, the drive block 2
After rewinding the magnetic tape 1 to the starting end using 01,
Fast forwarding is started and the processes shown in FIGS. 6 and 7 are repeated until the end is reached.

When the operation starts, first in branch 60, the CTL signal discriminating circuit 9 detects a CTL signal to determine whether it is an unrecorded area or a recorded area. If it is determined that the area is an unrecorded area, it is determined in branch 61 whether or not it is the beginning of an unrecorded area. This is because the CTL signal discrimination circuit 9 always recognizes whether the area is a recorded area or an unrecorded area, so that when the CTL signal is interrupted, it can be determined that the area is at the beginning of an unrecorded area. Branch 6 if it is the beginning of an unrecorded area
2, it is determined whether or not it is the starting edge of the magnetic tape 1. Step 63 is performed only if it is not the starting edge, and if it is the starting edge, the process proceeds to step 64. In step 63, after the CTL signal counting circuit 10 loads and stores the result of counting the CTL signals (hereinafter referred to as a counter value) into the memory 111,
Reset counter value. In step 64, the reel diameter detection circuit 5 detects the diameter of the take-up reel 3a, and the tape travel amount calculation circuit 6 stores it as r0 in the travel amount calculation formula.

If branch 61 determines that the tape is in the middle of an unrecorded area, branch 65 determines whether it is the end of the tape. If it is not the end, the process ends, and if it is the end, the process proceeds to step 66, where r1 in the travel distance calculation formula is detected and stored in the same way as step 64. Then, in step 67, the tape running amount calculation circuit 6 calculates the tape running amount by substituting the previously detected r0 and r1 detected in step 66 into the running amount calculation formula, and calculates the tape running amount.
11 and store it. The data stored in step 68 is then displayed by display circuit 121.

On the other hand, if the branch 60 determines that the area is a recorded area, the process advances to a branch 69, where the CTL signal determination circuit 9 determines whether or not this is the beginning of the recorded area. This is because the CTL signal discrimination circuit 9 always recognizes whether the area is a recorded area or an unrecorded area, so if a CTL signal is detected in the middle of an unrecorded area, it can be determined that the area is at the beginning of a recorded area. If it is the beginning of the recorded area,
In step 70, the CTL signal discrimination circuit 9 discriminates the recording mode, but this is done by detecting the period of the CTL signal since the magnetic tape 1 is running at a constant speed by the drive block 201. Next, in the branch 71, it is determined whether or not it is the starting end of the magnetic tape 1. If it is not the starting end, the process advances to steps 72 and 73, and if it is not the starting end, the process advances to step 74. In step 72, step 6
6, the tape running amount calculation circuit 6 detects the winding diameter r1 in the running amount calculation formula, and in step 73, the tape running amount calculation circuit 6 detects the tape running amount calculation circuit 6 in step 67.
Similarly, the previously detected r0 and the r1 detected in step 72 are substituted into the running amount calculation formula to calculate the tape running amount and store it in the memory 111. In step 74,
The CTL signal counting circuit 10 is caused to start counting CTL signals.

On the other hand, when it is determined in branch 69 that the magnetic tape 1 is in the middle of the recorded area, in branch 75, since the magnetic tape 1 is running at a constant speed, when the recording mode changes, a change appears in the cycle of the CTL signal. Utilizing this fact, the CTL signal discrimination circuit 9 detects a change in the recording mode. If there is a change in the recording mode, the counter value is stored in step 76, and then the counter value is reset;
In step 77, the count is restarted from 0, and in step 78, the changed recording mode is recorded in the memory 111. If there is no change in the recording mode, it is determined in branch 79 whether or not the end of magnetic tape 1 has been reached. If it is not the end, the process ends, and only if it is the end, the process proceeds to step 80, where the CTL signal discrimination circuit 9 stores the counter value in the memory 11.
After storing it as 1, reset the counter value and proceed to step 8.
1, the display circuit 121 displays the data stored in the memory 111 as will be described later to confirm the usage status of the magnetic tape 1.

FIG. 8 is a diagram showing an example of the display on the display circuit 111 when cassette tapes recorded in the standard mode, triple mode, and standard mode are checked by the magnetic tape usage status checking device according to this embodiment. In this figure, the horizontal axis direction represents the position of the magnetic tape 1, and the left end of the horizontal axis means the starting end of the magnetic tape 1, and the right end means the ending end of the magnetic tape 1. The usage status of magnetic tape 1 is 30 minutes and 25 seconds in standard mode from the beginning, then 118 minutes and 45 seconds in 3x mode.
seconds, then 30 minutes and 50 seconds of recording in standard mode, and the remaining unrecorded area is enough to record 20 minutes in standard mode and 60 minutes in 3x mode. represents the existence of

Now, when we start the operation of checking the usage status of this magnetic tape, first, since it is recorded in the standard mode, we proceed from branches 60 and 69 to steps 70 and 74, and the CTL is
When signal counting is started and the operation mode changes from standard to triple mode, the process proceeds from branches 60, 69, and 75 to steps 76 to 78, stores the recording time in the memory 111 based on the counter value, and switches to recording mode. Record. The same process is repeated when changing from the 3x mode to the standard mode. Since there is no recording after recording in standard mode, steps 63 are executed from branches 60, 61, and 62.
, 64, the recording time in the standard mode is counted and the winding diameter thereof is detected. When the end of the tape is reached, the first
The travel distance is calculated and recorded in the same manner as in the example. In this way, the recording state of the entire cassette tape can be displayed as shown in FIG.

As described above, according to this embodiment, the reel (take-up reel 3a) for winding the magnetic tape (magnetic tape 1)
), a driving means (driving block 201) for running the magnetic tape, and a winding diameter detecting means (winding diameter detecting block 202) for detecting the winding diameter of the magnetic tape wound on the reel.
a running amount calculation means (tape running amount calculation circuit 6) that calculates the running amount of the magnetic tape from a change in the output of the winding diameter detection means;
Reproducing means for reproducing periodic signals recorded on magnetic tape (
a reproducing block 203), a counting means (CTL signal counting circuit 10) for counting the periodic signal outputted by the reproducing means, and a counting means or traveling distance calculating means for determining the presence or absence of the output signal and the period of the reproducing means. A selection means (CTL signal discriminating circuit 9) for selectively operating the , a memory (memory 111) for storing the output of the selection means, the output of the counting means, and the output of the traveling distance calculation means, and a memory for storing the information stored in the memory. By providing a display means (display circuit 121) for displaying, it is possible to check whether there is an unrecorded area, its position, and its range, as well as recording modes such as standard mode, 3x mode, etc. for recorded areas.
You can check the usage status of the entire magnetic tape, such as its position and range. Note that the reel diameter detection circuit 5, tape running amount calculation circuit 6, CTL signal discrimination circuit 9, CTL signal counting circuit 10, memory 111, and controller 15 can also be realized using a microcomputer, and the effects of the invention may be improved. There is no difference.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings. 9 and 10 are block diagrams of a magnetic tape usage status confirmation device showing a third embodiment of the present invention. In FIGS. 9 and 10, a magnetic tape 1, a cylinder 2, a take-up reel 3a, a supply reel 3b,
Cycle detector 4, reel diameter detection circuit 5, tape running amount calculation circuit 6, CTL signal reproducing amplifier 8, CTL signal discrimination circuit 9, take-up reel motor 13a, supply reel motor 13b, take-up reel drive circuit 14a and the supply side reel drive circuit 14b have the same configuration as that shown in FIG. 5, and detailed description thereof will be omitted.

This embodiment differs from the second embodiment in the following points. That is, there is a control head 16 that reproduces the CTL signal recorded on the magnetic tape 1 and outputs it to the CTL signal reproducing amplifier 8, and also records the CTL signal on the magnetic tape 1, and a control head 16 that reproduces the CTL signal recorded on the magnetic tape 1 and outputs it to the CTL signal reproduction amplifier 8, and a control head 16 that reproduces the CTL signal recorded on the magnetic tape 1 and records the CTL signal on the magnetic tape 1. It has a controller 151 that gives commands. Further, the recording start command from the controller 151 is given to the recording date and time generating circuit 17 in the recording block 206 in FIG. The recording date and time generating circuit 17 is recording date and time generating means for generating recording date and time data for identifying information to be recorded, and its output is given to the recording shift register 18. The recording shift register 18 uses a recording control signal generated from a vertical synchronization signal extraction circuit (not shown) as a clock signal, and generates a continuous control pulse train having a value corresponding to the data sent from the recording date and time generation circuit 17. The output thereof is given to the CTL signal modulation circuit 19. The CTL signal modulation circuit 19 modulates the duty ratio of the recording control pulse in two ways according to the binary data output from the recording shift register 18 to generate control pulses having values of "0" and "1". The output thereof is given to the CTL signal recording amplifier 20. The CTL signal recording amplifier 20 records the CTL signal modulated by the CTL signal modulation circuit 19 onto the magnetic tape 1 via the control head 16.

[0043] Also, the output of the CTL signal reproducing amplifier 8 is the CTL signal reproducing amplifier 8.
It is also provided to the signal demodulation circuit 21. The CTL signal demodulation circuit 21 detects the value "0" or "1" of the control pulse, and its output is given to the reproduction shift register 22. The playback shift register 22 operates when the controller 151 instructs to check the usage status of the magnetic tape 1, and outputs recording date and time data from the binary data output from the CTL signal demodulation circuit 21, and the output is stored in the memory. 112. memory 11
Reference numeral 2 stores the output of the CTL signal discrimination circuit 9, the travel distance calculation circuit 6, and the reproduction shift register 22, and the output is given to the display circuit 122. Display circuit 1
22 is for displaying the recorded data in the memory 112 by a method described later after completing the search for the usage status of the magnetic tape 1.

As for the specific format for recording and detecting the recording date and time data, the data output by the recording date and time generation circuit 17 is: the first 4 bits are month data, the next 5 bits are day data, and the next 3 bits are month data. Day of the week data, next 5 bits are hour data, last 6 bits are minute data, totaling 23 bits of data. The recording shift register 18 transfers this 23-bit data one bit at a time starting from the MSB to the CTL.
The signal is output to the signal modulation circuit 19 and recorded on the magnetic tape 1 following the cue signal recorded immediately after the start of recording. At the time of detection, the reproduction shift register 22 controls the CTL signal demodulation circuit 2.
The binary data detected by No. 1 is input from the LSB and taken in while sequentially shifted to the left. Furthermore, the value of the control pulse whose duty ratio has been modulated by the CTL signal modulation circuit 19 is set to "1", and the value of the normal control pulse is set to "0".

Here, the take-up side reel motor 13a, the supply side reel motor 13b, and the take-up side reel drive circuit 14a
and the supply side reel drive circuit 14b, the magnetic tape 1
The winding diameter detection block 202 detects the winding diameter of the take-up reel 3a from the period detector 4 and the reel winding diameter detection circuit 5.
The control head 16 and the CTL signal reproduction amplifier 8 constitute a reproduction block 204 that reproduces the CTL signal. A detection block 205 for detecting data includes a control head 16, a recording date and time generation circuit 17, a recording shift register 18, a CTL signal modulation circuit 19,
The recording date and time data is sent from the CTL signal recording amplifier 20.
It constitutes a recording block 206 that is superimposed on the TL signal and recorded on the magnetic tape 1.

The operation of checking the magnetic tape usage status of the magnetic tape usage status confirmation apparatus configured as described above will be explained using the flowcharts shown in FIGS. 11 and 12. When the operation starts and the controller 151 outputs a command to check the usage status of the magnetic tape 1, the drive block 201 is used to rewind the magnetic tape 1 to the starting end, and then fast forwarding is started. The processing shown in FIGS. 11 and 12 is repeated until the end is reached. Note that explanations of parts that perform the same processing as those in FIGS. 2 and 3 will be omitted. The difference from the flowcharts shown in FIGS. 2 and 3 is that when it is determined in branch 39 that it is not the beginning of a recorded record, the flow advances to branch 55 to determine whether detection of recording date and time data has been completed. If this detection is completed, the process proceeds to branch 44 and similar processing is performed, and if the detection is not completed, the process proceeds to step 56 to detect recording date and time data. To detect the recording date and time data, the CTL signal demodulation circuit 21 in block 205 demodulates the binary data in order from the LSB, and the data is detected by the playback shift register 22.
This is done by capturing this signal and storing it in the memory 112. Also, steps 38 and 4 in Figures 2 and 3
In place of step 8, display steps 381 and 481 are provided. In the display step 481, the display circuit 122 displays the data stored in the memory 112 using a method that will be described later. Also, in step 381, the display circuit 122 displays the data stored in the memory 112 in a similar manner.

FIG. 13 shows an example of the display method of the display circuit 122, in which the horizontal axis direction represents the position of the magnetic tape 1, the left end of the horizontal axis represents the starting end of the magnetic tape 1, and the right end represents the ending end of the magnetic tape 1. are doing. The usage status of Magnetic Tape 1 was recorded in standard mode for 30 minutes from 8:00 a.m. on Thursday, March 7th, and then in 3x mode for 119 minutes from 9:00 p.m. on Sunday, March 10th. 31 in standard mode on Tuesday, March 12th at 6:30 p.m.
This indicates that the remaining time has been recorded for 20 minutes in standard mode, and that there is enough unrecorded area to record for 60 minutes in 3x mode.

As described above, according to this embodiment, the reel (take-up reel 3a) for winding the magnetic tape (magnetic tape 1)
), a driving means (driving block 201) for running the magnetic tape, a winding diameter detecting means (reel winding diameter detecting circuit 5) for detecting the winding diameter of the magnetic tape wound on a reel, and a winding diameter detecting means (reel winding diameter detecting circuit 5). A running amount calculation means (tape running amount calculation circuit 6) that calculates the running distance of the magnetic tape from a change in output, a reproducing means (reproducing block 204) that reproduces a periodic signal recorded on the magnetic tape, and an output of the reproducing means. Discrimination means (C
TL signal discrimination circuit 9), recording means (recording block 206) that generates information for identifying information to be recorded and records it on the magnetic tape, and detection means (detection block 206) that detects identification information from the output of the reproduction means. 205), a memory (memory 112) for storing the output of the discrimination means, the output of the traveling distance calculation means, and the output of the detection means, and a display means (display circuit 122) for displaying the information stored in the memory. By providing this, it is possible to check the usage status of the magnetic tape similarly to the first configuration. In addition to this, by detecting the identification information recorded on the magnetic tape at the start of recording, it is possible to easily confirm what information is recorded.

Note that the reel diameter detection circuit 5, tape running amount calculation circuit 6, CTL signal discrimination circuit 9, memory 112, controller 151, recording date and time generation circuit 17, recording shift register 18, CTL signal modulation circuit 19, CTL signal The demodulation circuit 21 and the reproduction shift register 22 can also be realized using a microcomputer, and the effects of the invention will remain the same. Furthermore, the same effect can be obtained by setting the value of the normal CTL signal pulse to "1" and setting the value of the control pulse whose duty ratio is modulated to "0".

(Embodiment 4) A fourth embodiment of the present invention will be described below with reference to the drawings. FIG. 14 is a block diagram of a magnetic tape usage status confirmation device showing a fourth embodiment of the present invention. In this figure, a magnetic tape 1, a cylinder 2, a take-up reel 3a, a supply reel 3b, a period detector 4
, reel diameter detection circuit 5, tape running amount calculation circuit 6, control head 7, CTL signal reproduction amplifier 8, CTL
Signal discrimination circuit 9, memory 11, display circuit 12, take-up reel motor 13a, supply reel motor 13b, take-up reel drive circuit 14a, supply reel drive circuit 14b,
Since the controller 15 has the same configuration as that shown in FIG. 1, detailed description thereof will be omitted.

The differences between this embodiment and the first embodiment are as follows. That is, it has a cycle detector 24 that detects the rotation cycle of the supply reel 3b, and its output is given to a reel diameter detection circuit 25. The reel diameter detection circuit 25 detects the diameter of the supply reel 3b, and its output is given to the tape running amount calculation circuit 26. Similar to the tape running amount calculation circuit 6, the tape running amount calculation circuit 26 calculates the running amount of the magnetic tape from the change in the reel winding diameter using the running amount calculation formula (6), and its output is It is applied to the averaging circuit 27. The averaging circuit 27 averages the outputs of the tape running amount calculation circuits 6 and 26 to calculate a more accurate running distance of the magnetic tape 1, and the output is given to the same memory 11 as in the first embodiment. . Other points are similar to the first embodiment described above. The display circuit 12 displays the data stored in the memory 11 in the manner shown in FIG. 3, as in the first embodiment.

[0052] Also, the take-up side reel motor 13a, the supply side reel motor 13b, and the take-up side reel drive circuit 14a.
and the supply side reel drive circuit 14b, the magnetic tape 1
The winding diameter detection block 202 detects the winding diameter of the take-up reel 3a from the period detector 4 and the reel winding diameter detection circuit 5.
is configured, and includes a period detector 24 and a reel diameter detection circuit 2.
5 constitutes a winding diameter detection block 207 that detects the winding diameter of the supply reel 3b, and the control head 7 and C
The TL signal reproduction amplifier 8 constitutes a reproduction block 203 that reproduces the CTL signal, and the tape running amount calculation circuit 6
, the tape running amount calculation circuit 26 , and the averaging circuit 27 constitute a running amount calculation block 208 that calculates a more accurate running amount of the magnetic tape 1 .

The operation of checking the magnetic tape usage status of the magnetic tape usage status confirmation apparatus configured as described above will be explained using the flowcharts shown in FIGS. 15 and 16. First, when the controller 151 outputs a command to check the usage status of the magnetic tape 1, the drive block 201 is used to rewind the magnetic tape 1 to the starting end, and then starts fast forwarding until the end is reached. Figure 15,1
The process represented by 6 is repeatedly performed. Note that Figures 2 and 3
A description of the parts that perform the same processing as in is omitted.

The differences from FIG. 2 include step 321 instead of step 32, step 341 instead of step 34, step 361 instead of step 36, and
step 371 instead of step 37, step 4
step 411 instead of step 1, step 431 instead of step 43, step 461 instead of step 46, step 471 instead of step 47,
step 501 instead of step 50, step 5
1 is newly provided with step 511 instead of step 1.

In steps 361 and 461, the tape running amount calculation circuit 6 stores the winding diameter of the take-up reel 3a as r1 in the running amount calculation formula, and the tape running amount calculation circuit 26 stores the winding diameter of the supply reel 3b. r1 in the mileage calculation formula
be memorized as In steps 321, 411, and 501, the tape running amount calculation circuit 6 calculates r0
has already been detected, the winding diameter of the take-up reel 3a is set to r1.
If r0 has not been detected, it is stored as r0, and if r0 has already been detected, the tape running amount calculating circuit 26 stores the winding diameter of the supply reel 3b as r1, and if it has not been detected, it stores it as r0. Remember.

Further, in steps 371 and 471, the tape running amount calculating circuit 6 on the winding side and the tape running amount calculating circuit 26 on the supplying side respectively store r0 and r.
1, the running distance of the magnetic tape 1 is calculated respectively, and the averaging circuit 27 averages the outputs of the two tape running amount calculating circuits and outputs the average, and stores it in the memory 11. step 341,
Step 431, step 511, step 371
, similarly to step 471, after calculating and storing the respective running distances of the magnetic tape 1, the tape winding diameter r1 is re-stored as r0.

As described above, according to this embodiment, there is a take-up reel (take-up reel 3a) for winding the magnetic tape (magnetic tape 1), a supply reel (supply reel 3b) for feeding out the magnetic tape, and a a first winding diameter detecting means (winding diameter detecting block 202) that detects the winding diameter of the magnetic tape wound on the take-up reel; A second winding diameter detection means (winding diameter detection block 207) detects the winding diameter of the magnetic tape, and a change in the output of the first winding diameter detection means and a second winding diameter detection means detect the winding diameter of the magnetic tape.
Running amount calculation means (running amount calculation block 208
), reproducing means (reproducing block 203) for reproducing the periodic signal recorded on the magnetic tape, and discriminating means (CTL signal discriminating circuit) for discriminating the presence or absence and period of the output signal of the reproducing means and operating the traveling distance calculating means. 9), and a memory (memory 11) for storing the output of the discrimination means and the output of the traveling distance calculation means.
and a display means (
By providing the display circuit 12), the traveling distance of the magnetic tape 1 can be calculated more accurately. The reel diameter detection circuit 5, the reel diameter detection circuit 25, the tape running amount calculation circuit 6, the tape running amount calculation circuit 26, the CTL signal discrimination circuit 9, the memory 11, the controller 15, and the averaging circuit 27 are implemented by a microcomputer. Even if the invention is used, it is possible to realize the invention, and the effect of the invention remains the same.

Although each of the above-mentioned embodiments describes a device for checking the usage status of a magnetic tape in a video tape recorder, the present invention can also be applied to a device for checking the usage status of other magnetic tapes such as DAT. Needless to say, it can be done.

[0059]

Effects of the Invention As explained in detail above, the invention of claim 1 of the present application detects the presence or absence of recording and its time based on the presence or absence and period of the output signal obtained from the reproducing means, thereby reducing the use of the entire magnetic tape. You can check the status. Furthermore, it is possible to recognize the recording mode, such as standard mode or triple mode, and its position range over the entire tape based on changes in the period of the output signal obtained from the reproduction means. .

[0060] In addition to this, in the invention of claim 2 of the present application, since the running distance of the tape is calculated using a counting means in the recorded area, it is not possible to accurately calculate the size of the recorded area. You can get the effect that you can.

Furthermore, in the third and fourth aspects of the present invention, recorded information is recorded on the magnetic tape in advance during recording, and this information is read out when checking the usage status and recorded in the memory at the same time. Therefore, identification information such as recording date and time recorded on the magnetic tape can be detected, and it is possible to easily recognize what information is recorded on the magnetic tape.

Furthermore, in the inventions of claims 5 and 6 of the present application, the winding diameter detecting means is provided on both the take-up reel and the supply reel, and the travel distance obtained from this is averaged, so that the magnetic tape can be accurately measured. It becomes possible to calculate the distance traveled.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic tape usage status confirmation device in a first embodiment of the present invention.

FIG. 2 is a flowchart (part 1) for explaining the operation of the magnetic tape usage status confirmation device in the first embodiment.

FIG. 3 is a flowchart (part 2) for explaining the operation of the magnetic tape usage status confirmation device in the first embodiment.

FIG. 4 is a diagram showing a display example of the operation results of the magnetic tape usage status confirmation device in the first embodiment.

FIG. 5 is a block diagram showing the configuration of a magnetic tape usage status confirmation device in a second embodiment of the present invention.

FIG. 6 is a flowchart (part 1) for explaining the operation of the magnetic tape usage status confirmation device in the second embodiment.

FIG. 7 is a flowchart (part 2) for explaining the operation of the magnetic tape usage status confirmation device in the second embodiment.

FIG. 8 is a diagram illustrating a display example of the operation results of the magnetic tape usage status confirmation device in the second embodiment.

FIG. 9 is a block diagram of a magnetic tape usage status confirmation device in a third embodiment of the present invention.

FIG. 10 is a block diagram showing a detailed configuration of a detection block and a recording block of a magnetic tape usage status confirmation device in a third embodiment.

FIG. 11 is a flowchart (part 1) for explaining the operation of the magnetic tape usage status confirmation device in the third embodiment.

FIG. 12 is a flowchart (part 2) for explaining the operation of the magnetic tape usage status confirmation device in the third embodiment.

FIG. 13 is a diagram showing a display example of the operation results of the magnetic tape usage status confirmation device in the third embodiment.

FIG. 14 is a block diagram of a magnetic tape usage status confirmation device in a fourth embodiment of the present invention.

FIG. 15 is a flowchart (part 1) for explaining the operation of the magnetic tape usage status confirmation device in the fourth embodiment.

FIG. 16 is a flowchart (Part 2) for explaining the operation of the magnetic tape usage status confirmation device in the fourth embodiment.

FIG. 17 is a block diagram showing an example of a conventional magnetic tape usage status confirmation device.

[Explanation of symbols]

1 Magnetic tape 3a Take-up reel 3b Supply reel 4, 24 Period detector 5, 25 Reel diameter detection circuit 6, 26 Tape travel amount calculation circuit 7,16 Control head 9 CTL signal discrimination circuit 10 CTL signal counting circuit 11,111,112 Memory 12, 121, 122 Display circuit 13a Take-up side reel motor 13b Supply side reel motor 14a Take-up side reel drive circuit 14b Supply side reel drive circuit 15,151 Controller 17 Recording date and time generation circuit 18 Recording shift register 19 CTL signal modulation circuit 20 CTL signal recording amplifier 21 CTL signal demodulation circuit 22 Reproduction shift register 27 Average circuit 201 Drive block 202, 207 Winding diameter detection block 203,204 Reproduction block 205 Detection block 206 Recording block 208 Mileage calculation block

Claims (6)

[Claims] 1. A reel for winding a magnetic tape, a driving means for running the magnetic tape, a winding diameter detecting means for detecting a winding diameter of the magnetic tape wound on the reel, and the winding diameter detecting means. a running distance calculating means for calculating the running distance of the magnetic tape from a change in the tape winding diameter output output from the magnetic tape, a reproducing means for reproducing the periodic signal recorded on the magnetic tape, and the presence or absence of an output signal of the reproducing means. and a cycle, and operates the running amount calculating means every time the running amount calculation means changes; a memory storing the output of the judging means and the magnetic tape running amount obtained from the running amount calculating means; and the memory. A magnetic tape usage status confirmation device comprising: display means for displaying information stored in the magnetic tape usage status confirmation device. 2. A reel for winding a magnetic tape, a driving means for running the magnetic tape, a winding diameter detecting means for detecting a winding diameter of the magnetic tape wound on the reel, and the winding diameter detecting means. a running distance calculation means for calculating the running distance of the magnetic tape from a change in the tape winding diameter output output from the magnetic tape, a reproducing means for reproducing the periodic signal recorded on the magnetic tape, and a periodic signal outputted by the reproducing means. a counting means for detecting the recording time of the magnetic tape by counting; and a selection means for determining the presence or absence and period of an output signal of the reproducing means and selectively operating either the counting means or the traveling distance calculating means. a memory for storing the output of the selection means, a recording time signal of the counting means, and a running amount of the magnetic tape obtained from the running amount calculating means; and a displaying means for displaying the information stored in the memory; A magnetic tape usage status confirmation device comprising: 3. A reel for winding a magnetic tape, a driving means for running the magnetic tape, a winding diameter detecting means for detecting a winding diameter of the magnetic tape wound on the reel, and the winding diameter detecting means. a running distance calculating means for calculating the running distance of the magnetic tape from a change in the tape winding diameter output output from the magnetic tape, a reproducing means for reproducing the periodic signal recorded on the magnetic tape, and the presence or absence of an output signal of the reproducing means. and a period, and operates the traveling distance calculating means every time the traveling distance calculation means changes; a recording means that generates information for identifying recorded information and records it on the magnetic tape; a detection means for detecting identification information; a memory for storing an output of the discrimination means; a magnetic tape running amount obtained from the running amount calculation means; and an output of the detection means; and displaying information stored in the memory. 1. A magnetic tape usage status confirmation device, comprising: a display means for displaying. 4. The magnetic tape usage status confirmation according to claim 3, wherein the recording means includes a recording date and time generating means for generating a recording date and time signal, and is a recording date and time recording means for recording the signal. Device. [Claim 5] A take-up reel for winding a magnetic tape;
a supply reel for sending out the magnetic tape; a drive means for running the magnetic tape; a first winding diameter detection means for detecting a winding diameter of the magnetic tape wound on the take-up reel; a second winding diameter detecting means for detecting the winding diameter of the wound magnetic tape; and a change in the output of the first winding diameter detecting means and a change in the output of the second winding diameter detecting means. A running distance calculation means for calculating the running distance of the magnetic tape, a reproducing means for reproducing the periodic signal recorded on the magnetic tape, and determining the presence or absence and period of the output signal of the reproducing means, a discriminating means for operating a running amount calculating means; a memory for storing an output of the discriminating means and a magnetic tape running amount obtained from the running amount calculating means; and a display means for displaying information stored in the memory. A magnetic tape usage status confirmation device comprising: 6. The running amount calculating means includes a first tape running amount calculation circuit that calculates the running amount of the magnetic tape from a change in the output of the tape winding diameter output from the first winding diameter detecting means; a second tape running amount calculating circuit that calculates the running amount of the magnetic tape from a change in the tape winding diameter outputted from the second winding diameter detecting means; and outputs of the first and second tape running amount calculating circuits. 6. The magnetic tape usage status confirmation device according to claim 5, further comprising: an averaging circuit for averaging.