JPS60231938A - Stopping method of tape-like recording medium - Google Patents

Abstract

PURPOSE:To reduce the influence of inertia extremely and to stop a tape-like recording medium at a required stopping position by travelling the recording medium at a low speed in a prescribed direction at a time immediately before the stop of the recording medium. CONSTITUTION:When a head 5 arrives at a point G ( 52), the output of a detecting circuit 201 is turned from H to L, so that the device is turned to a stop mode to stop the travelling of the tape, but the tape is not actually stopped due to inertia until the head 5 reaches a point I. When the device is turned to the stop mode, a signal T'8 is turned to H and a pulse indicating the head of a blank is supplied to one input terminal of an AND gate 222 through a delay circuit 217 for a light period. Since the signal T'8 is in the H state again, a narrow pulse is outputted from the AND gate 222 as a signal T'2, the device is turned to a reverse P/B mode and the tape starts to travel at a low speed in the reverse direction. When the head 5 reaches the point G ( 54) again, the output of the circuit 201 is turned from L to H and thereby the device is turned to the stop mode again, but the tape is stopped at a position (O55) where the head 5 is close to the point G because the travelling speed of the tape is slow.

Description

[Detailed description of the invention] technical field The present invention relates to a method for stopping a tape-shaped recording medium.

<Description of Prior Art 2 Conventionally, in video tape recorders (VTRs) and audio tape recorders that record and play back video and audio signals, there is a function to search for the beginning part or unrecorded part of a recorded signal, so-called cueing. A search engine with a blank search function is being considered. By the way, when performing these cue searches and blank splicing searches, the tape must be accurately stopped at a desired stop position.

However, in conventional VTRs, the tape was run at high speed and stopped when it reached the desired stop position, but in this case, due to the influence of inertia that occurs when the tape runs at high speed, the tape does not actually reach the desired position. The vehicle would stop after passing the stop position, making it impossible to obtain the desired stop position.

Furthermore, if the running direction of the tape is reversed at the time of cueing or blank search, the stopping position will deviate greatly in the opposite direction, making the stopping position extremely unstable.

<Object of the Invention> The present invention has been made in view of the above-mentioned drawbacks, and provides a method for stopping a tape-shaped recording medium that can stably stop the tape-shaped recording medium at a desired stopping position. The entire purpose is to present.

<Explanation 2 using Example 2 An example in which the present invention is applied to a helical scan type VTR will be described in detail below. FIG. 1 is a block diagram showing a magnetic tape 1 as a recording medium, a rotary drum 2, a rotary head 3a and a rotary head 3b for recording and reproducing video signals, heads 3m,
3b is fixed to the drum 2. 4 is a drum motor for rotating the drum 2; 5 is a cue signal (described later);
Fixed head for recording and reproducing control continuous wave signals)
6 is a cue signal recording/reproducing circuit.

Reference numeral 8 denotes a system controller, which supplies information on various operating modes of the VTR, such as recording, playback, fast forward, one rewind, etc., to each part of the apparatus. 9#i is a cue control circuit for cueing using a reproduced cue signal, and IO is a blank search control circuit for performing a blank search using a similarly reproduced cue signal. will be explained in detail later.

11fl system controller 81 cue control circuit 9.
In order to perform the desired operation of the capstan 131C based on the information generated by the blank search control circuit lO, etc., the capstan lj is activated via the capstan motor 12t.
This is a capstan motor control circuit that performs k control.

Next, the operation of each part of the VTR shown in FIG. 1 will be explained in order.

(Description of Cue Signal Recording/Reproducing Circuit) First, the cue signal (control signal) in the VTR of this embodiment will be explained with reference to FIG. In FIG. 2, reference numeral 15 denotes a helical track (main recording area) formed on the magnetic tape l, on which video signals are recorded and reproduced.

16 is a key rack on which the key signal is recorded;
It is formed in the longitudinal direction at the end of the tape l. VTR in this example
As shown in Fig. 2, the continuous wave signal in K is recorded at a position corresponding to the recording start portion of the video signal (as shown in Fig. 2 16a), and then a predetermined length is recorded. The signal tube is recorded [as shown in Figure 2, 16b], and the portion after 7 is constructed so that the same continuous signal can be recorded for d.

FIG. 3 is a diagram showing a specific example of the cue signal recording and reproducing circuit 6 configured to record and reproduce cue signals as described above. In FIG. 3, 31 is a clock oscillator, 32.35, 38.45 and 47 are resistors, 33.
34.3.7 and 39 are transistors, 36, 44 respectively
Each H is a capacitor, 40 is an inverting circuit (inverter), 4
1. 42 is a mono multivibrator, 43 is an amplifier, 46 is a winding of the head 5, 48 is a terminal to which a head control signal (HC) is supplied from the system controller 8, and 49 is supplied with a reproduced cue signal. It is a terminal.

Figures 4(a) to 4 are timing charts showing the waveforms of various parts of the S value in Figure 3.The operation will be explained below using Figure 4.The above HC is shown in Figure 4(a). ) as shown in <,
Low level (only when the VTR is in video signal recording mode)
At other times, it is a high level (l() signal).

First, the operation during recording of bidet No. 1g will be explained.

When the VTR starts recording a video signal, HC changes from H to L. Accordingly, the output of the inverter 40 becomes H, and the transistor 39 is turned on. Accordingly, the winding 46 becomes energized.

On the other hand, the clock signal outputted from the clock oscillator 31 (shown in 41st EI (c)) causes the transistor 33 to
turns on and off, and when the transistor 37 is off, a waveform similar to the clock signal is supplied to the winding @ 46 via the capacitor 36, and this signal is recorded as a cue signal by the head 5 on the longitudinal track 16. will be done.

In addition, HC is supplied with Mono-Multi 41, and Mono-Multi 41
is triggered by the falling edge of HC, and the minute period T+ is output as Q output.
(as shown in FIG. 4(b)), H is obtained.

The mono multi 42 is triggered by the fall of the Q output of the mono multi 41, and outputs a predetermined period T as shown in FIG. 4(b).
Obtain L signal only. When the Q output of the monomulti 42 is L, the transistor 37 is turned on, so this T! Recording of cue signals is prohibited during this period.

When the Q output of the monomulti 42 is H, the transistor 37
is in the off state, so as shown in FIG. 4, the aforementioned clock signal is recorded as a cue signal except for the period indicated by T2 during video signal recording.

When recording video signals, tape l is capstan 1.
Since the track 16 is caused to travel at a constant speed by a pinch roller (not shown) and a pinch roller (not shown), a cue signal as shown in FIG. 2 is recorded on the track 16. At this time, the ratio of the length in the longitudinal direction of the tape of the portion 16a shown in FIG. 2 to that of the portion 16b is: T.

It is.

Next, the operation at times other than when recording video signals will be explained. At this time, since HC is H, the transistor 34 is on, and the clock signal obtained from the clock oscillator 31 is cut off here. Further, the output of the inverter 40 becomes L and the transistor 39 is OFF, so the circuit configuration of the cue head 50 is vo. Resistance from 47. capacitor 44
．． Head, capacitor 36. It will be grounded via transistor 34.

Therefore, if the tape 2 is currently running and the head 5 is tossing the clock signal recording portion of the track 16, the recorded clock signal will be transferred to the winding 46 of the head 5.
is detected from one end of the cueing control circuit 9. which will be described in detail later. It is supplied to the blank search control circuit 10.

With the above-described configuration, it is possible to record and reproduce cue signals as shown in FIG. 2. In addition, in the above configuration, only the same clock signal is recorded and reproduced to enable cueing and blank search, but by superimposing other control signals and the above key signal, various other devices can be used. Needless to say, control can be performed at the same time.

(Description of Cue Control Circuit) Next, the operation of the cue control circuit shown in FIG. 1 will be described. First, the method of cueing control by the VTR of this example will be conceptually explained using FIG. Figure 5 line 20
indicates the position of the head 5 on the track 16 when fast forwarding the tape to find the beginning, and the line 21
shows the case when resetting in early spring and cueing.

In the figure, Δ indicates each detection position, and ○ indicates the final stop position.

Also, two lines indicate that the tape is running at high speed.

First, when fast forwarding the tape to find the beginning, point B (Δ2
In step 2), a drop in the playback cue signal level is detected, and it is detected that this portion is the beginning of a recorded video signal or the beginning of an unrecorded portion. Then, it is detected at point 0 (Δ23) that the reproduction cue signal level rises again within a predetermined distance t1 thereafter, and it is determined that this portion is the leading portion of the recorded video signal.

And this timing cancels fast forwarding,
Actually, based on the high speed running of the tape, due to inertia, E
The head 5 moves to the point. Thereafter, the tape is rewound in the opposite direction at a low speed, and at point B (Δ24), the rise of the playback cue signal level is detected and the tape running is stopped. In the case of Jin, the tape is running at low speed, so it is located close to point B ((,
>25).

On the other hand, when rewinding the tape early and searching for the beginning, the distance t-B point (Δ2
6), and this distance is the predetermined distance t.

If the following occurs, cancel early spring return. At this time, the head moves at point A 1 due to the inertia described above, but after that, the tape is put into a fast forward state, and through the steps exactly the same as the beginning of the tape by fast forwarding described above (Δ22', Δ23', Δ24
025'), the tape is stopped when the head is positioned close to point B, as shown at 025'.

Is this how you cue the tape? If this is done, even if the cue signal is based on only one type of clock signal as described above, it is possible to distinguish between the beginning of the recorded video signal and the beginning of the unrecorded portion (hereinafter referred to as head-blank discrimination). . Since the 17C cue stop is fed at low speed in a predetermined direction (rewinding direction), the tape stop position is extremely stable. In addition, the effect of the above-mentioned inertia is small and very good cueing can be achieved. Furthermore, g) - Unrecorded portion 16b of the signal
The length of the tape is always detected by running the tape in the same direction, and since the low-speed running direction is also the same, the necessary tape stop command is obtained just before the unrecorded part 16b, and the unrecorded part Instability of the stopping position due to differences in the length of the tape 16b and the running direction of the tape does not occur. Furthermore, since the effect of inertia due to low-speed running is reduced by 1 using the amount of tape running due to the head-blank discrimination described above, the number of steps until stopping can be minimized and the maximum effect can be obtained.

FIG. 6 is a diagram showing an example of a specific circuit configuration for realizing cueing as described above. The reproduced and amplified cue signal described in FIGS. 1 and 3 is inputted to the counter 13OK via the terminal IO8. It terminal 115.
Fast forward from system controller 8 for each 116H (F
F) This is a terminal into which cue commands and early spring return FR) cue commands are input, and each command is input as a pulse signal.

Next, the signals output to the control data generation circuit 128 will be explained. The control data generation circuit 128 is a circuit for supplying data to the capstan motor control circuit shown in FIG.

This data is indicated by a white arrow in FIG. 6, but since it is not directly related to the present invention, a detailed explanation will be omitted. It is input to the control data generation circuit 128.

As a signal, T1 is an FF running start command signal, Tt
is a reverse playback start command signal, T is a stop command signal,
T4 is an FR running start command signal.

In addition, as the number 1g outputted from the circuit 12g, T is F
A signal indicating F mode, T is a signal indicating all FR modes, T
D is a signal indicating the reverse playback mode, and T is a signal indicating the stop mode. That is, the control data generation circuit 128 is 1+
, Tt, Ta, 'T4, and also indicates the state of the cab stan motor 12 at T5. Ta.

6, 111.1.12.117 and 118 are flip-flops, respectively, 131.132 are clock oscillators, and 119.120.126.127 and 134 nfuk, orgate, 109.113.121.122.
123, 124, 125° 133, 134 and 135 are AND gates, 114 is a mono multivibrator, 129 is an amplifier, and 110, 130 are counters, respectively.

Hereinafter, the operation of the circuit shown in FIG. 6 will be explained step by step with reference to FIG. When an FF cue command is supplied from the terminal 115, the flip-flop 117f is set, and one input signal of the flip-flop 109 is set to H through the OR gate 12o. On the other hand, an H signal is also supplied to one terminal of the AND gate 121. At this time, since the tape is still stopped, T is naturally H. Furthermore, Ts −T
When s, Tt, and Ta are each H, it indicates the corresponding mode. Therefore, the output of the game 121 changes to H, and the output of the game (or game) 126 changes T to H. T1.
T.

It is assumed that the corresponding command is executed when T, and 'r are respectively H. Therefore, at this time, the capstan motor 12 is F'
Now controlled and driven in the F mode, the head 5 reproduces the track 16 and outputs a cue signal.

The output x-signal is counted by a 4-bit counter 130, and when the count value exceeds 8t-, an H level is output from the Q terminal, resetting the 3-bit counter 110 and setting the 7-lip flop Illi. Therefore 111
An H is output from the Q terminal of the ant game) 109, and the other input is 'tH. - At this time, since the FF mode is 'raha', one input terminal of the AND gate 135 is set to H through the OR gate 119.

Clock generators 131 and 132 are used for recording and reproducing, respectively.
A clock with a fine wave number corresponding to F and FR is generated. For example, the tape speed for FF and FR is 9 during recording and playback.
If the frequency is twice that of the clock generated by the generator 131, the frequency of the clock generated by the generator 132 is 9 times that of the clock generated by the generator 131.
The frequency is doubled.

Therefore, even if the tape speed changes, the amount of tape that runs during one period of the clock generated by the generator 131 or 132 remains constant.

Here, since the device is in FF mode, AND gate 135
The output of the clock generator 132 is supplied to the OR gate 109. At this time, the output of the timer 114, which will be described later, is high, and the output of the flip 70 knob Ill is high.

The output of the OR gate 120 is H, and the clock output from the clock generator 132 is counted by the 3-bit counter 110. The counter 110 is reset every eight cue signal clocks. Here, the frequency of the cue signal clock is set to be sufficiently higher than the frequency of the clock generated by the clock generator 131.1.32, so while the cue signal clock is being regenerated, the 3-bit counter The number of clocks that count 1100 is either o or l.

That is, the 3-bit counter 1lof'i measures the period from when the queue signal clock is no longer reproduced until it is reproduced again. The second bit of the 3-bit counter 110 is output from the Q terminal when the count value of the counter 110 is 2.
And at 30 o'clock, it becomes H, and when the count value is 4 or more, the output of the Q terminal of the 3rd bit becomes H. This third bit Q
When the terminal becomes HK, the flip-flop 111i is reset and the gate of the AND gate 109 is closed.

To explain this operation in relation to FIG. 5, point B (Δ2
If the reproduction cue signal clock cannot be obtained in 2),
Counter 110 no longer resets generator 1320
Start counting the generated clocks. and 0 points (Δ
23) The oscillation frequency of the generator 132 is adjusted in accordance with the length of the unrecorded portion 16b and the tape speed so that the count number of the counter 110 becomes 2 or 3 until the cue signal clock is regenerated at K. It has been decided. Therefore,
At point 0 (Δ23), the cue signal begins to be reproduced again and when the Q output of the counter 130 becomes H, the AND gate 113 also becomes H.
The Q output of the 7 rig 70 112 changes to H. At this time, since the power of both AND gate 122 becomes H,
The output CT2) jr'iH and the V device perform reverse playback (
The mode becomes reverse P/B) mode. Also, at this time, the counter 110 is reset. By the way, if the cue signal clock is not reproduced again even after running the tape for a period of t, the Q output of the third bit of the counter 110 becomes H, the Q output of the flip-flop becomes L, and the AND gate 109 is clocked. By the way, interruptions in the reproduction of the cue signal clock may also occur due to dropouts. In addition, in this configuration, due to instability of tape running, the Q output from the counter 130 may not be stably obtained f'L, and Cf'L+l! l
This appears to be an interruption in the reproduction of the cue signal clock. However, according to the circuit configuration shown in FIG. 6, the number of clocks counted by the counter 110 during the interruption of reproduction in this minute period is l at most, so that the length of the unrecorded portion is equal to the predetermined length shown in FIG. Long 1. [On the other hand, it is not subject to determination as to whether it is long or short.

Now, due to point C (Δ23) in Figure 5, the reverse P/B mode is Tt.
When commanded by the capstan motor control circuit 11
The capstan motor 13FiFF is operated to run the tape at a low speed in the opposite direction (to fully rewind the tape) through the capstan motor 13FiFF. However, at this time, the tape actually runs in the reverse direction at a low speed (Cheve speed rit, which is the same as that during recording), when the head 5 reaches point E shown in Fig. 5 due to the aforementioned inertia. When the FBJIC starts running at low speed, it triggers timer 114 and runs timer 1 for a predetermined period.
14 works. The operating output of the period timer 114 (Q
) is inverted and supplied to the AND gate 109 to block the passage of the clock. This prevents the above-mentioned length of the unrecorded portion from being judged during the unstable running period after mode switching. When the inverse P/B mode is entered, the output T of the capstan motor control circuit 128 becomes H, and the AND gate 133 supplies the clock output from the generator 131 to the AND gate 109 via the OR gate 134.

Then, when the output of the timer 114 turns to L, the generator 131
The clock output from the counter 110 is supplied to the counter 110.

When the head 5 reaches the 0 point again, the counter 110
is no longer reset, and the counter 110 is no longer reset by the generator 13.
1 starts counting, and as is clear from the above explanation, when the count advances to 2 or 3, the point B (Δ24) is reached again.

Here, the cue signal clock begins to be regenerated again, and the AND gate 113 changes to H based on the Q output of the counter 130, and the Q terminal output of the flip-flop 112 also becomes H. At this time, since T is H, both the AND gate 1230's power becomes H, and the apparatus enters the stop mode, and tape running is also stopped. At this time, since the influence of inertia is small, the tape stops when the head 5 reaches the position Q25.

Next, regarding the case where there is an FR cue command, Fig. 521
Let's explain with reference to. When the FR cue command is supplied from the terminal 116, the flip-flop 118 is set,
Through the OR gate 120, it becomes one input terminal in of the AND gate 109, and T4 becomes H. Therefore, the capstan motor 12 comes to be controlled and driven in the FR mode. Then, when T6 becomes H, the output of the OR gate 119 becomes H, and the output of the generator 132 becomes an ant game) 135
．． Orgate 134. The counter 110iC is supplied via the AND gate 109.

When the head 5 reaches the 6th point and the cue signal clock is no longer reproduced, the reset of the counter 110 is released.
The clock output from the generator 132 is sent to the counter 110.
is counted, and it is counted 2 to 3 times during 1 when the head reaches 8 points (Δ26). Then, when the cue signal clock is regenerated again at point B, the output of the AND gate 113 changes to H, and the Q output of the flip-flop 112 becomes H. At this time, since T6 is H, T1 becomes H through the AND gate 125 and OR gate 126i, and the FF mode is commanded. At this time, due to the inertia mentioned above, the head 5
moves to point A and the direction of travel is reversed. At this time, the output of the AND gate 125 is supplied to the above-mentioned timer 114, and the output of the timer 114 is set to H for a short time to prevent the clock from passing through the AND gate 109 immediately after the mode is switched.

In this way, the FF mode is entered, and since the subsequent operation is the same as when the FF cueing command is issued, a detailed explanation will be omitted. In addition, Δ22' and Δ2 in Fig. 5
3' and Δ24' are respectively Δ22. The same operation as Δ23° and Δ24 is performed, and the stop position 025' is also the same as ○25.

As is clear from the above explanation, the circuit configuration shown in FIG. 6 can realize the above-mentioned arrangement.

Needless to say, it also has the corresponding effects described above. Moreover, according to the configuration shown in FIG. 6, in addition to the above-mentioned effects,
Even if there is a slight drop in the level of the playback cue signal due to dropout or the like, there is no error in determining that this is the beginning of the video signal.

(Description of Blank Search Control Circuit) Next, the operation and specific circuit configuration of the blank search control circuit shown in FIG. 10 will be explained. VTR of this example
A blank search control method in this case will be conceptually explained using FIG. A line 50 shown in FIG. 7 indicates where the head 5 is on the track 16 when performing a blank search in FF mode, and a line 51 indicates the position when performing a blank search in FR mode. .

As in Fig. 5, Δ is each detection position, O is the final stop position, and 2
The main lines each indicate high speed running of the tape.

1. In blank search using FF mode, FF
A full drop in the level of the playback cue signal is detected at point 190 (Δ52), and it is detected at point tH (Δ53) that the level of the playback cue signal does not rise even after the tape has traveled the stored distance. As a result, it is detected that this portion is the leading portion of the unrecorded portion of the video signal. Then, FF' is released at this timing, but as described above, the head 5 moves one point at a time due to inertia. Therefore, the tape is then rewound in the opposite direction at a low speed at point G (△54), and the tape drive is stopped by detecting the rising edge of the playback cue signal. The head will stop.

On the other hand, when performing a blank search in FR mode, first detect the rising edge of the playback cue signal at point G (△56), then F
Cancel R mode. At this time, due to the aforementioned inertia, TJ
The head 5 moves to point F, but after that, it is set to FF mode, and through the steps exactly the same as the blank search in the OFF mode described above (shown at Δ52', Δ53', and Δ54'), it is moved to G as shown at ○55'. VC head 5 near the point
Stop the tape at the location where is located.

If a blank search is performed using the method described above, even if the cue signal is composed of only the 13th class clock signal, the blank search can be reliably distinguished from cueing. In addition, the tape stop position is stable and the influence of inertia is small.

Furthermore, the number of steps in the stop box can be minimized.

FIG. 8 is a diagram showing an example of a specific circuit configuration for realizing the blank search as described above.

In FIG. 8, 208 is a terminal to which the playback cue signal output from terminal 49 in FIG. 3 is input, and terminal 1 in FIG.
The same signal as that supplied to 08 is supplied.

In addition, terminals 215 and 216 are connected to the system controller 8, respectively.
FF blank search command.

This is a terminal to which an FR blank search command is input, and each command is input as a pulse signal. 201u detection circuit, 202.203 and 204a each mono multivibrator, 205 inverting amplifier, 216.217 and 218 each delay circuit, 219.220.221.22
3. 224 and 225 are respectively analog gates), 228 is a control data generation circuit, and 229.2301-J are OR gates, respectively. The control data generation circuit 228 is the same circuit as the circuit 128 shown in FIG. 6 described above, and its explanation will be omitted. Note that Tl, ~fill, of the circuit 228 is the same as that of the circuit 128.
T and -T8, respectively, and show similar human outputs.

Hereinafter, the operation of the circuit shown in FIG. 8 will be explained step by step using FIG. 7.

First, the operation during FF blank search will be explained. When the FF blank sensor 1c command pulse is input from the terminal 215, one input V of the AND gate 224 is supplied via the OR gate 229'i.

At this time, since the tape is stopped, TJ is H.

Therefore, in response to this pulse, T'l momentarily becomes H, the tape is fast-forwarded, and the head 5 traces the track 16 and outputs a reproduction key signal.

In this state, when the head 5 reaches point G (Δ52) shown in FIG. 7, the output of the detection circuit 201 changes from H to L. At the same time, the output of the inversion circuit 205 also changes from L to H. The monomulti 202 is triggered by the fall of the output of the detection circuit 201 and generates a narrow pulse. This pulse is transmitted by a delay circuit 216 for a predetermined distance t during FF operation.
After being delayed by the time (τ) required to run one tape, the signal is supplied to the AND gate 223. Head 5 is at point G
After passing τ1, the head 5 reaches the H point (Δ53), but if the cue signal is not reproduced again at this time, the output of the detection circuit 201 remains L, and the inversion circuit 205
The output of is H. Therefore, if this portion (point G) is the beginning of a video signal unrecorded portion (the beginning of a blank), the AND gate 223 generates a pulse with a timing of Δ53.

The output pulse of this AND gate 223 is
220 is supplied to one human power terminal. and gate 2
20 is supplied with TI, but at this time T' is H, and the pulse indicating the beginning of this blank is passed through the AND gate 22o and the OR gate 230.
It becomes l5. For this reason, the apparatus enters the stop mode at this timing and stops the tape running, but due to the above-mentioned inertia, the tape does not stop until the head 5 reaches one point.

When the device enters the stop mode, TI changes to H, and the above-mentioned pulse indicating the beginning of the blank is sent to the minute time delay circuit 217'.
It is supplied to one input terminal of the AND gate 222 via fr. At this time, since TI is at H again, a narrow pulse is output as T' from the AND gate 222, and the device enters the reverse P/B mode.

When the device enters the reverse P4 mode and the tape begins to run in the reverse direction at low speed, and the head 15 reaches point G again (Δ54),
The output of the detection circuit 201 changes from L to H. The monomulti 204 is triggered by the rising edge of the input and outputs a narrow pulse. Therefore, at the timing of Δ54, the AND gate 221
outputs a narrow pulse, and the pulse outputs the OR gate 23.
0 becomes TI. Therefore, the device goes into stop mode again, but since the tape running speed is low at this time, the tape fits (055) until the head 5 is close to point G.
Stop at.

Next, the operation of each part of No. 89 when an FR blank search command is issued will be explained with reference to fs51 in FIG. A narrow pulse indicating FR blank search is sent to terminal 21.
6, the pulse is fed through an AND gate 225 to circuit 228 as TJ. In this way, the apparatus enters the FR mode, and when the head 5 reaches point G (Δ56), the output of the detection circuit 201 becomes H. At this time, the output of the AND gate 219 also changes to H, and the monomulti 203 which is triggered by the rising edge of the input generates a narrow pulse. This pulse becomes 'r' through the OR gate 230, temporarily puts the device X in a stop mode, is slightly delayed by the delay circuit 218, and is then supplied to the AND gate 224 through the OR gate 229. At this time, +1u has already become H, and the second gate 224 generates one narrow pulse. At this time, the tape is stopped due to inertia with the head 5 reaching point F, and thereafter the apparatus enters the FF mode and performs the same operation as the FF blank research described above. That is, Δ5 in Figure 7
2', Δ53', and Δ54' are Δ52. Δ53. Δ5
It is the same @ worship meeting as in 4, stopping position 1iiQ55
' is also in the same position as Q55.

As is clear from the above description, the blank search as described above can be realized by the circuit configuration shown in FIG. Moreover, it goes without saying that the above-mentioned effects can be obtained accordingly. Further, it is even more preferable that the configuration of the detection circuit 201 is configured such that it does not react to a drop in the playback cue signal level for a minute period due to dropout or the like.

(Explanation of partial changes in configuration, etc.) In the VTR as an embodiment of the present invention described above,
The cue signal can be used for so-called cueing and blank research, but if you want to add other control functions to the kVTR, you can superimpose other signals on the cue signal of the above embodiment. Functions can be easily added. In this case, it is desirable to superimpose the signals by frequency division, for example, and configure the signal so that they can be easily separated when reproducing the cue signal.

Further, in the VTR of the above embodiment, although C is made to be completely separate from the review control circuit and the Planksana control circuit 1O, as is clear from the above explanations, there are many parts that operate in the same way. , it is also possible to share these.

Further, in the above example, tape running during FF and PR is performed by a capstan, but it is of course also possible to perform this by driving a reel. However, in this case, since the tape running speed changes every moment due to changes in the reel diameter, it is extremely difficult to reach the predetermined distance t+.
What is necessary is to adopt a configuration that takes into consideration that the value changes within a predetermined range.

For example, the judgment criteria based on the counter 110 and the delay circuit 216
The delay time ft may be set to a value that allows it to be determined whether the video signal is at the beginning or blank even if it becomes Iff to a certain extent.

Explanation of Effects> As explained in detail using the embodiments above, according to the stopping method of the present invention, the tape-shaped recording medium is running at a low speed in a predetermined direction immediately before stopping, so that there is no inertia. It has now become possible to extremely reduce the influence of this, and to bring the stop position of the tape-shaped recording medium very close to the desired stop position. Furthermore, since the low-speed running direction is a fixed, fixed direction, the stopping position is always the same no matter which direction the search is performed, and the stopping position is extremely stable. Furthermore, since the low-speed running direction when controlling for stopping is the same, the stop control circuit can be used in common no matter which direction the search is performed, which simplifies the circuit configuration.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main configuration of a VTR as an embodiment of the present invention, and FIG. 2 is a diagram showing the cue signal (
3 shows a specific example of a cue signal recording and reproducing circuit for recording and reproducing cue number 1 shown in FIG. 2, and FIG. 4 shows each part of 31. A timing chart showing the waveforms. Figure 5 is a diagram conceptually showing the method of cueing control using the VTR shown in Fig. 1. Figure 6 shows a specific example of the cueing control circuit in the 1st @. Circuit diagram: FIG. 7 is a diagram conceptually showing a blank search control method by the VTR of FIG. 1, and FIG. 8 is a circuit diagram showing a specific example of the blank search control circuit in FIG. 1. l is a magnetic tape as a tape-shaped recording medium, and 20
．． 21V1 shows the tape running when starting, 25.25' shows the stop position when starting, 50.51q shows the tape running when blanking, and 55.55'i shows the stopping position when blanking. Applicant Canon Co., Ltd. No. 30 Tsuke No. 4 Kasumi (d) 5■廿-m- pB Otsu ν Jin

Claims (1)

[Claims] When the tape-shaped recording medium passes a desired stop position while traveling in the first longitudinal direction, the medium is caused to travel in a second direction opposite to the first direction, and the medium is 2
A method for stopping a tape-shaped recording medium, wherein when the medium passes through the stop position while traveling at the same time, the medium is caused to travel at a low speed in the first direction, and when the medium reaches the stop position again, the medium is stopped.