JPS60231946A - Stopping method of tape-like recording medium - Google Patents

Abstract

PURPOSE:To set up the stop position of a tape-like recording medium extremely stably by using an unrecorded part having a prescribed length in a controlling continuous wave signal corresponding to a connection part of a recording information signal to determine the stop position on the basis of any one end of the unrecorded part at the time of socalled head locating. CONSTITUTION:When a head 5 reaches a point C and the reproduction of a queue signal clock is interrupted, a counter 110 counts up the clock, and when the queue signal clock is reproduced again at a point B, the output of an AND gate 113 is turned to H and the Q output of an FF112 is turned to H. Since a signal T6 is H at that time, a signal T1 is turned to H through an AND gate 125 and an OR gate 126 and an FF mode is commanded. At that time, the head 5 is moved up to a point A by its inertia and its travelling direction is inverted. The output of the AND gate 125 is supplied to a timer 114. If the output of the timer 114 is turned to H for a slight period, the clock can be prevented from the passage of an AND gate 109 immediately after the switching of the mode.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a method for stopping a tape-shaped recording medium, and particularly relates to a method for stopping a tape-shaped recording medium. The present invention deals with a tape-shaped recording medium in which, excluding the recording portion, sub-recording areas are formed in the main recording area and sub-recording areas in which a control continuous wave signal indicating that the information signal has been recorded are respectively formed in the longitudinal direction thereof. The present invention relates to a method for stopping a tape-shaped recording medium in an apparatus.

<Description of Prior Art> Conventionally, in video tape recorders (VTRs) and audio tape recorders that record and play back video signals and audio signals, there is a function to search for the beginning part of a recorded signal or an unrecorded part, so-called cueing. A search engine with a blank search function is being considered. By the way, when such a function is provided especially to a helical scan type VTR, it is preferable to form a control track (sub-recording area) in the longitudinal direction of the end of the tape in addition to the helical track (main recording area). I think that the.

This is because when performing a cue or blank search using a playback signal obtained by tracing a track on which a video signal is recorded, the tape cannot be run very fast, and the search takes time. It's too much. Further, since only the information on whether the recording has been recorded or not is obtained, cueing cannot be performed without some kind of ingenuity. Furthermore, if the video signal is missing due to dropouts or the like, this may be mistaken for an unrecorded portion.

Therefore, the signals recorded on the control track will be considered below. A control continuous wave signal indicating that the video signal has been recorded is recorded at a position on the control track corresponding to the video signal recorded on the helical track, and also corresponds to the joint portion of the recorded video signal. By providing a predetermined length of an unrecorded portion of a continuous wave signal on a position control track, control that includes information on whether it has been recorded or not and information indicating the beginning of the recorded portion can be performed using only one type of signal. signals can be recorded.

However, when the tape is stopped after performing cueing with the above-described configuration, the tape stopping position differs depending on the running direction of the tape at the time of cueing.

That is, depending on the running direction of the tape when the unrecorded portion of the predetermined length is detected, the stop position will be either immediately before or after it.

<Object of the Invention> In view of the above-mentioned drawbacks, the present invention provides a method for recording sub-recording corresponding to joint portions of information signals even when running a tape-shaped recording medium in either the forward or reverse direction for so-called cueing. It is an object of the present invention to provide a method for stopping a tape-shaped recording medium by which a stop command can be obtained either before or after an unrecorded portion of a predetermined length of an area.

<Explanation using an embodiment> Hereinafter, an embodiment in which the present invention is applied to a helical scan type VTR will be described in detail. FIG. In Fig. 1, there is a magnetic tape as a recording medium, two rotating drums, and heads 3a and 3b, respectively, for recording and reproducing video signals.
is fixed to drum 2. A drum motor for rotating the 4-piece drum 2, 5Fi fixed head for recording and reproducing a cue signal (continuous wave signal for control) to be described later, 6
This is a cue signal recording and reproducing circuit.

The 8-digit system controller supplies information on the operating modes of the VTR, such as recording, playback, fast forwarding, rewinding, etc., to each part of the apparatus. 9 is a cue control circuit for cueing using the reproduced cue signal, and 10 is a blank search control circuit for performing a blank search using the same reproduced cue signal.About these operations. will be explained in detail later.

The capstan 13 is controlled via the capstan motor 12 in order to cause the capstan 13 to perform a desired operation based on information generated by the 11-digit system controller 8, cue control circuit 9, blank search control circuit 10, etc. This is a capstan motor control circuit.

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, 15 is a helical track (main recording area) formed on the magnetic tape 1, on which video signals are recorded and reproduced. Reference numeral 16 denotes a cue track on which a cue signal is recorded, and is formed at the end of the tape 1 in the longitudinal direction. As shown in FIG. 2, the cue signal in the VTR of this example is a minute length continuous wave signal recorded at a position corresponding to the recording start portion of the video signal (shown in FIG. does not record a signal (shown in Figure 2 16b),
The subsequent portion is also arranged so that the same continuous signal is recorded.

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, 52, 55, 58, 45 and 47 are resistors, 53,
54, 57 and 69 are transistors, 56, 44 are capacitors, 40 is an inverter, 41
．． 42 are mono multivibrators, 43 amplifiers,
46 head 5 windings, 4B is 7 stem controller 8
This is a terminal to which a head control signal (HO) is supplied, and a terminal to which a cue signal reproduced by 49 times is supplied.

FIGS. 4(a) to 4(d) are timing charts showing the waveforms of the various parts of the main microcontroller shown in FIG. 3. The operation will be explained below using FIG. 4. The above-mentioned HO is as shown in Figure 4(a) (,
Giro level (only when the VTR is in video signal recording mode)
At other times, it is a high level (H) signal.

First, the operation when recording a video signal will be explained. VTR
When the inverter 40 starts recording a video signal, HC changes from H to L, and as a result, the output of the inverter 40 changes from L to H, and the transistor 39 turns on. Accordingly, 46 windings become energized.

On the other hand, the clock signal output from the clock oscillator 31 (
(as shown in FIG. 4(c)), when the transistor 33 is turned on and off and the transistor 57 is turned off, a waveform similar to the clock signal is supplied to the winding 46 via the capacitor 36. The signal will be recorded in the longitudinal track 16 by the head 5 as a cue signal.

In addition, HO is supplied to the monomulti 41, and the monomulti 41
Trigger at the falling edge of HC and output for a short period T+ as Q output
(as shown in FIG. 4(b)), H is obtained. mono multi 4
2 is triggered by the fall of the q output of the monomulti 41, and obtains an L signal as the Q output only for a predetermined period T2 shown in FIG. 4(b). Since the transistor 37 is turned on when the Q output of the monomulti 42 is L, recording of the cue signal is prohibited during this T2 period. When the Q output of the monomulti 42 is H, the transistor 57 is in the off state.
), the above-mentioned clock signal is recorded as a cue signal during video signal recording except for the period indicated by T2.

When recording a video signal, the tape 1 is run at a constant speed by a capstan 13 and a pinch row 2 (not shown), so a cue signal as shown in FIG. 2 is recorded on the track 16. At this time, the ratio of the length of the portion 16a in FIG. 2 in the longitudinal direction of the tape to that of the portion 16b is T1:T2.

Next, the operation at times other than when recording video signals will be explained. At this time, since He is H, the transistor 34 is turned on and the clock signal obtained from the clock oscillator 31t is cut off.

Also, the output of the inverter 40 is L, and the transistor 3
9 is OFF, the circuit configuration of the cue head 5 is V
It is grounded from the CC through the resistor 47, capacitor 44, head, capacitor 36, and transistor 34.

Therefore, if the tape 2 is currently running and the head 5 is tracing the clock signal recording portion of the track 16, the recorded clock signal will be transferred to the winding 46 of the head 5.
The signal is detected at one end, amplified by an amplifier 45, and supplied via a terminal 49 to a cue control circuit 9 and a blank search control circuit 10, which will be described in detail later.

With the above configuration, it is possible to record and reproduce cue signals as shown in FIG. 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 cue signal, it is possible to control various other devices. Needless to say, both can be done at the same time.

(Description of Cue Control Circuit) Next, the operation of the cue control circuit shown in FIG. 1 will be explained. First, the method of cueing control by the VTR of this example will be conceptually explained using FIG. Line 20 in Figure 5 shows where the head 5 is on the track 16 when the tape is fast-forwarded to find the beginning. It shows that.

In the figure, each detection position is indicated by △, and O 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 cue signal level rises again within a predetermined distance Mt+ thereafter, and it is determined that this portion is the leading portion of the recorded video signal.

And at this timing, I cancel the fast forwarding mode,
In reality, due to inertia based on high-speed running of the tape, E
The head 5 moves to the point. Then, rewind the tape in the opposite direction at a low speed, detect the rise of the playback cue signal level at point B (Δ24), and stop the tape running. In this case, the tape runs at low speed and reaches a position close to point B (02
The head 5 is located at 5).

On the other hand, when resetting the tape early and searching for the beginning, the distance from the falling edge of the playback cue signal to the rising edge of the playback cue signal is set at point B (Δ26).
If this distance is less than a predetermined distance, the early spring return is canceled.At this time, the head moves to point j5A due to the inertia described above, but after that, the tape is put into the fast forward state, and the head is through steps such as extraction and total < 1rtJ (shown in Δ22′, Δ25′, Δ24′),
○As shown in 25', the tape is stopped when the head is located close to point B.

If you use this method to locate the beginning of the tape, it will be possible to distinguish between the beginning of the recorded video signal and the beginning of the unrecorded part even if it is a cue signal that consists of only one type of clock signal as described above. (hereinafter referred to as head-blank discrimination).

In addition, when performing a cue stop, the tape is stopped at an extremely stable position because the tape is fed at a low speed due to early spring return. In addition, the influence of inertia mentioned above is small and extremely good cueing is possible.Furthermore, the length of the unrecorded portion 16b of the cue signal is always detected by running the tape in the same direction, and the analysis speed running direction is also the same. Therefore, the unrecorded part 1
It is necessary to obtain a tape stop command immediately before tape 6b, and instability in the stop position is likely to occur due to differences in the length of unrecorded portion 16b and the running direction of the tape. Furthermore, since the effect of inertia due to low-speed running is reduced by utilizing 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 table circuit configuration for realizing cueing as described above. The reproduced and amplified cue signal described in FIGS. 1 and 3 is input to the counter 13° via the terminal 108. Also, the terminal 115,
116H Fast forward to each system controller 8! 0
(FF) Cue command, early spring return PR) This is a terminal into which cue commands are input, and each command is input as a pulse signal.

Next, the signals input and output to and from 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. Control data generation circuit 1
The signals inputted to 28 are T, an iFF running start command signal, T2 a reverse direction reproduction start command signal, T5 a stop command signal, and T4 an FR running start command signal. Further, as signals outputted from the circuit 128, T5 is a signal indicating the FF mode, T6 is a signal indicating the PR mode,
T7 is a signal indicating the reverse playback mode. T8 is a signal indicating the stop mode. That is, the control data generation circuit 128 generates T, ,'l', ,T,.

Generates data in response to each command signal of T4, and
T5 shows what state the capstan mode 12 is in.
．． T6. T7. This is illustrated by the output signal of T8.

In FIG. 6, 111, 112, 117 and 118 are 7 lip and 70 lip, 131. [2 are clock oscillators, 119, 120, 12/1, 127 and 134 are clock generators, 109, 113, 121, 122,
123, 124, 125, 133, 134 and 135 are each AND gate, 114 is a mono multivibrator,
129 amplifiers, 110 and 130 are counters respectively.

Below, the operation of the circuit shown in FIG. 6 will be explained in order using FIG.
Explain as n. When the FF cue command is now supplied from the terminal 115, the flip-flop 117 is set and one input signal of the AND gate 109 is set to H through the OR gate 120. 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, T8 is naturally R. Nao T5 vT6
#T7 and tT8 indicate the corresponding mode when they are respectively H.

Therefore, the output of the AND gate 121 changes to H and passes through the OR gate 126 to convert T1 to H. T+ r T2 +
It is assumed that the corresponding command is executed when T5 + T4 are respectively H. Therefore, at this time, capstan motor 2 is FF.
The head 5 reproduces the track 16 and outputs a cue signal as controlled and driven in the mode.

The output cue signal is counted by a 4-bit counter 30, and when the count value exceeds 8, JE is output from the Q terminal, resetting the 3-bit counter 10 and setting the 7-lip flop 111. Therefore q of 111
Terminal F)H is output and the other input of AND gate 109 is set to H. On the other hand, at this time, in FF mode, F) T
Since s is H, one input terminal of AND gate 135 is set to H through OR gate 119.

Clock generators 131 and 132 are used for recording and reproducing, respectively.
A clock with a frequency corresponding to 'F and PR is generated. For example, if the tape speed during FP and F'R is nine times the speed during recording and playback, the frequency of the clock generated by the generator 132 is nine times the frequency of the clock generated by the generator 151. . Therefore, even if the tape speed changes, the amount of tape that runs during the period of the clock generated by the generator 151 or q152 remains constant.

Here, the device is in FF mode, so ando goo) 135
The output of the clock generator 132 is supplied to the AND gate 109 via an OR gate 134. At this time, the output of a timer 114 (described later), the output of the L17 lip flop 111, and the output of the H1 OR gate 120 become H, and the clock output from the clock generator 132 is counted by the 5-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 clocks generated by the clock generators 131 and 132, so while the cue signal clock is being regenerated, the 5-bit counter 110 is The number of clocks to be counted is either 0 or 1.

That is, the 3-bit counter 110 measures the period from when the cue signal clock is no longer reproduced until it is reproduced again. The output of the q terminal of the 2nd bit of the 5-bit counter 110 is R when the count value of the counter 110 is 2 and 30, and the output of the Q terminal of the 3rd bit is R when the count value is 4 or more. . When the Q terminal of the third bit becomes H, the 7-lip block 111 is reset and the gate of the AND gate 109 is closed.

To explain this operation in relation to FIG. 5, there are three points (Δ2
If the reproduction cue signal clock cannot be obtained in 2),
The counter 110 is no longer reset and starts counting the clock generated by the clock generator 132. 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 reproduced again in step 23). It has been decided. Therefore,
At the 0 point (Δ23), the cue signal starts 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 flip-flop 112 changes to H. At this time, since the power of both AND gate 122 becomes H,
The output cr2) becomes H and the device plays in the reverse direction (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 the tape is run for a period of tl, the Q output of the 5th bit of the counter 110 becomes ■, and the clip 7
If the Q output of 0 is low, the clock will not pass through the AND gate 109.

Incidentally, interruptions in the reproduction of the cue signal clock may also occur due to dropouts.

In addition, in this configuration, the tape running is unstable K and the number of counters 1
30, the bQ output may not be obtained stably, and this also 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 at most 1, so that the length of the unrecorded portion is equal to the predetermined length shown in FIG. It is not determined whether the length is longer or shorter than the length t1.

Now, when the reverse φ mode is commanded by T2 at point C (Δ23) in FIG. It can be operated to run the tape. However, at this time, the tape actually runs in the reverse direction at a low speed (same tape speed as during recording) when the aforementioned inertia head 5 reaches point E shown in FIG.

When the tape starts running in the reverse direction at low speed, timer 114
is triggered and the timer 114 operates for a predetermined period. During this period, the operating output (Q) of the timer 114 is the AND gate 10.
9 and is inverted and supplied to prevent the passage of the clock.

This prevents the length of the unrecorded portion from being judged during the unstable tape running period after mode switching. When the reverse P/B mode is entered, the output T7 of the cab stan motor control circuit 128 becomes R, and the AND gate 133 supplies the clock output from the generator 151 to the AND gate 109 via the OR gate 134. Then, when the output of the timer 114 changes to L, the clock output from the generator 131 is supplied to the counter 110.

When the head 5 reaches the 0 point again, the counter 110
is no longer reset), 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 2t 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 % clip 70 tube 112 also becomes H. At this time, since T7 is at H, both the input forces of the AND gate 125 are at H, and the υ device enters the stop mode and tape running is also stopped. At this time, the influence of inertia is small.

The tape stops when the head 5 reaches position 025.

Next, regarding the case where there is a PR cue command, Fig. 5 21
Let's explain with reference to. 11'R cue command is sent to terminal 11
When supplied from 6, it sets the clip frog 118 and the - of the AND gate 109 through the OR gate 120.
The other input terminal is set to H, and T4 is set to H. Therefore, the capstan motor 12 is controlled and driven in the 12FiFR mode. And when T6 becomes H, or gate 119
When the output of the generator 132 is 5, the output of the generator 132 is supplied to the counter 110 via the AND gate 135, the OR gate 134, and the AND gate 109.

When the head 5 reaches the 0 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 2 to 3 times until the head reaches 3 points (Δ26). When the cue signal R is reproduced again at point B, the output of the AND gate 113 changes to H, and the Q output of the clip-flop 112 becomes -. At this time, since T6 is H, the JFF mode in which T1 is H is commanded via the AND gate 125 and the OR gate 126. At this time, the aforementioned inertia drive head 5 moves to point A, and the traveling direction is reversed. Further, at this time, the output of the AND gate 125 is supplied to the above-mentioned timer 114, and by keeping the output of the timer 114 at H for a short time, the clock is prevented from passing through the AND gate 109 immediately after the mode is switched.

In this way, the PIF mode is entered, and since the subsequent operation is the same as when the FF cueing command is issued, a detailed explanation BA will be omitted. Furthermore, Δ22' in Fig. 5,
Δ23' and Δ24' are 22. Δ25. It performs the same operation as Δ24, and the stop position 025' is also Q25.
will be in the same position as

As is clear from the above description, the circuit configuration shown in FIG. 6 can realize cueing as described above.

Moreover, it goes without saying that it has the corresponding effects described above, and according to the configuration shown in FIG. 6, in addition to the effects described above,
Even if there is a slight drop in the level of the playback cue signal due to dropouts, etc., it is a mistake to judge this as the beginning of the video signal (explanation of the blank search control circuit). 1. The operation and specific circuit configuration of the blank search control circuit shown in FIG. 10 will be explained.

First, a blank search control method in the VTR of this example 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 the F'F mode, and #i! 51 shows the case where a blank search is performed in the FR mode. Similarly to FIG. 5, Δ indicates each detection position, 0 indicates the final stop position, and two lines indicate high speed running of the tape.

First, in blank search using FF mode, FF
During the mode, a drop in the level of the playback cue signal is detected at point G (Δ52), and it is detected at point H (Δ53) that the level of the playback cue signal does not rise even after the tape has traveled a predetermined distance. As a result, it is detected that this portion is the leading portion of the unrecorded portion of the video signal. 11 is released at this timing 1, but as described above, the head 5 moves to one point due to inertia. Thereafter, the tape is rewound in the reverse direction at a low speed, and at point G (Δ54), the rising edge of the reproduction cue signal is detected and tape running is stopped. In this case, since the tape is running at low speed, the head will stop at a position close to point G (OSS).

On the other hand, when performing a blank search in PR mode, first detect the rising edge of the playback cue signal at point G (Δ56), then P
Cancel R mode. At this time, due to the inertia mentioned above, fi
The head 5 moves to the -7 point, but then switches to the FF mode and performs the same steps as the blank search in the FF mode described above (as shown in Δ52', Δ55', and Δ54'), as shown in Q55'. The tape is stopped when the head 5 is positioned close to point G.

If you perform a blank search using the method described above, you will find one type of glue.
To reliably perform a blank search that is distinguished from a cue signal even when the cue signal is only a pick signal. In addition, the tape stop position is stable and the influence of inertia is small. Furthermore, the number of steps until stopping 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 reproduction cue signal outputted from the terminal 49 in FIG. 3 is input, and the same signal as that supplied to the terminal 10B in FIG. 6 is supplied. Also, the terminal 215
, 216 are the system controllers 8 and 216, respectively.
F7' This is a terminal to which a 5-link search command and a PR blank search command are input. Each command is input as a pulse signal. 201 is a detection circuit, 202, 205 and 204 Fi are each mono multivibrator, 205 a
Inverting amplifier, 214, 217 and 218 are delay circuits, 21? , 220 , 221 , 222 , 22
5, 224 and 225 are AND gates, 228 is a control data generation circuit, and 229 and 230 are OR gates. Regarding the control data generation circuit 228, see 86 above.
It is a circuit similar to circuit 128 in the figure, and its explanation will be omitted.

Note that Tl, ~T'8 of the circuit 228 are T1 of the circuit 128.
- T8 respectively, and similar input/outputs are shown.

The operation of the circuit shown in FIG. 8 will now be explained step by step with reference to FIG.

MafI’? The blank search operation will be explained.

When a pulse commanding the j5FF blank search is input to the terminal 215, it is supplied to one input of the AND gate 224 via the OR gate 229. At this time, since the tape is stopped, T'B is H. Accordingly, in response to this pulse, TF becomes -H instantaneously, the tape is fast-forwarded, the head traces the five-track track 16, and a reproduction cue signal is output.

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. When the output of the detection circuit 201 falls, the monomulti 202 is triggered and generates a narrow pulse. This pulse is delayed by the delay circuit 216 by a time (T1) required to run the tape a predetermined distance t1 during FF, and then supplied to the AND gate 223K. After head 5 passes point G, head 5 reaches point H (Δ53) after T1, but if the cue signal is not reproduced again at this time, the output of detection circuit 201 remains L, and inversion circuit 205 The output is H. Therefore, if this portion (point G) is the beginning of a video signal unrecorded portion (the beginning of a blank), a pulse is generated at the timing of AND gate 223 times Δ53.

The output pulse of this AND gate 223 is
20 is supplied to one input terminal. and gate 22
T2 is supplied to the other input terminal of 0, but at this time T
2 is H, and the pulse indicating the beginning of this blank becomes T; via an AND gate 220 and an OR gate 230. Therefore, the apparatus enters the stop mode at this timing and stops the tape running, but in reality, due to the above-mentioned inertia, the tape does not stop until the head 5 reaches one point.

When the apparatus enters the stop mode, T- changes to H, and the above-mentioned pulse indicating the beginning of the blank is supplied to one input terminal of the Antoge 1' 222 via the minute time delay circuit 217. At this time, since T2 has become H again, a narrow pulse is output as T4 from the AND gate 222, and the device enters the reverse Pβ mode.

When the device is in reverse P/'B mode, the drive starts traveling in the opposite direction at low speed, and when the head 5 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 22
Outputs a pulse with a narrow width of one order of magnitude, and this pulse is output from OR gate 2.
30 and becomes T2. Therefore, the device goes into stop mode again, but at this time the tape running speed is low, so
The tape stops at position 055) where the head 5 is close to point G.

Next, the operations of the eighth section when a PR blank search command is issued will be explained with reference to the line 51 shown in FIG. A narrow pulse indicating FR blank search is sent to terminal 216.
When supplied to the circuit 228, the pulse is supplied to the circuit 228 as a Tr via the AND gate 225. In this way, the apparatus enters the FR mode, and when the head 5 reaches point G (A56), the output of the detection circuit 201 becomes R. 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 is connected to Ti via the OR gate 230, temporarily puts the device in a stop mode, is slightly delayed by the delay circuit 218, and is then supplied to the AND gate 224 via the OR gate 229. At this time, T
(W becomes H and cyan toggles) 224#-j: A narrow pulse is generated as T1.

At this time, the tape is stopped when the head 5 reaches one point due to inertia, and after that the apparatus enters the FF mode and performs the same operation as the FF blank search described above. That is, Δ52' in FIG.

Δ55' and Δ54' are respectively Δ52. Δ53. It performs the same operation as Δ54, and the stopping position ○55' is also ○55.
The same position as .

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,
Although the cue signal can be used for so-called cue searching and blank search, if you want to add other control functions to the VTR, you can superimpose other signals on the cue signal of the above embodiment. Functions can be easily added. In this case, for example, it is desirable that the cue signals be superimposed by frequency division and configured so that they can be easily separated when reproducing the cue signal.

In addition, in the VTR of the above embodiment, the cue control circuit 9
Although the blank search control circuit 10 and the blank search control circuit 10 are completely separate, as is clear from the above explanations, there are many parts that perform similar operations, and it is also possible to share these parts.

Further, in the above example, tape running during Ff and FR is performed by the capstan, but this can also be done by driving the reel. However, in the case of runners, the running speed of the tape changes every moment due to changes in the reel diameter, so it is extremely difficult to obtain the predetermined distance t1.
It is sufficient to adopt a configuration that takes into consideration that l changes within a predetermined range. For example, even if the judgment criterion by the counter 110 or the delay time tl of the delay circuit 216 changes to some extent, it may be set to a value that allows it to be determined whether the video signal is at the beginning or blank.

<Description of Effects> As described above in detail using the embodiments, according to the present invention, by using the unrecorded portion of a predetermined length of the control continuous wave signal corresponding to the joint portion of the recorded information signal, When performing so-called cueing, the stopping position is determined using one end of the unrecorded portion as a reference, making it possible to make the stopping position extremely stable.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main configuration of a VTR as an embodiment of the present invention, FIG. 2 is a diagram for explaining the cue signal (control signal) in the VTR of FIG. 1, and FIG. 2 is a diagram showing a specific example of a cue signal recording/reproducing circuit for recording and reproducing the cue signal shown in FIG. FIG. 3 is a diagram conceptually showing a cueing control method. 6 is a circuit diagram showing a specific example of the cue control circuit in FIG. 1, FIG. 7 is a diagram conceptually showing a blank search control method by the VTR shown in FIG. FIG. 2 is a circuit diagram showing a specific example of the blank search control circuit in FIG. 1; 1 is a magnetic tape as a tape-shaped recording medium, 15 is a helical track as a main recording area, 16 is a control track as a sub recording area, 16b is an unrecorded area of a predetermined length, and 20.21 is a cueing time. tape run, 25.25'
50.51 indicates the tape running position during the blank search, and 55.degree. 55' indicates the stop position during the blank search. Applicant: Canon Co., Ltd.

Claims (1)

[Claims] a main recording area for recording information signals; and a control continuous wave indicating that the information signal has been recorded in the main recording area except for an unrecorded portion of a predetermined length corresponding to a joint portion of the recorded information signal. In an apparatus for handling a tape-shaped recording medium in which sub-recording areas in which signals are recorded are formed in the longitudinal direction of the medium, the continuous wave signal is When the reproduction of the medium is started, the medium is run in a second direction opposite to the first direction, and the reproduction of the continuous wave signal is stopped while the medium is running in the second direction. When detected, it is determined whether the reproduction end point is a desired stop position based on whether the subsequent non-reproduction period is within a predetermined period determined corresponding to the predetermined length,
A method for stopping a tape-shaped recording medium, in which the medium is caused to run at a low speed in the first direction when the desired stopping position is reached, and the medium is stopped when reproduction of the continuous wave signal is started again.