JPS60231941A - Stopping method of tape-like recording medium - Google Patents

Abstract

PURPOSE:To reduce the number of steps up to the stop of a tape-like recording medium and to stop the tape quickly and stably by using the travelling distance of the tape which is necessary for the discrimination of a required stopping position to travel the tape at a low speed in the reverse direction. CONSTITUTION:At the time of blank search in an FF mode, the level drop of a reproduced queue signal is detected at a point G ( 52) in the FF mode and then the state that the level of the reproduced queue signal is not raised even if the tape is travelled by a prescribed distance is detected by a point H ( 53). Consequently, the part H is detected as the leading part of an unrecorded part of a video signal and the FF is released at the timing, but a head is moved up to a point I due to its inertia. Therefore, the tape is rewound at a low speed in the reverse direction, and after detecting the rise of the reproduced queue signal at the point G ( 54), the tape travelling is stopped. Since the tape is travelled at the low speed, the head is stopped at a position (O55) close to the point G.

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 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, if such a function is to be 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). Seem. This is because when cueing or blank searching is performed using the playback signal obtained by tracing the track on which the video signal is recorded, the tape cannot be run that fast and the search takes too much time. Put it away.

Also, since you can only get information about whether it has been recorded or not,
Cueing cannot be done without some kind of ingenuity. Furthermore, if the video signal is lost due to dropout 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.

On the other hand, in conventional VTRs, the tape was run at high speed when searching for the beginning or blank search, and the tape was stopped when it reached the desired stop position. As a result, the vehicle actually stops after passing the desired stopping position, and the desired stopping position cannot be obtained.

Therefore, it is conceivable to run the tape at a low speed and stop the tape running when it reaches a desired stop position, thereby suppressing the positional deviation due to the influence of inertia.

However, in view of the above-mentioned background, when considering stopping the tape, when a portion where the control continuous wave signal is not recorded appears, it is either the beginning of the recorded video signal or the video. After detecting whether it is the beginning of an unrecorded part of the signal and determining whether it is at the desired stop position, the tape is run for some distance from that position, the tape is run at a low speed, and the stop position is detected again. There are many steps required to stop the tape, making it impossible to quickly locate the beginning or perform a blank search.

<Object of the Invention> The present invention has been made in view of the above-mentioned circumstances, and is capable of reducing the number of steps to stop a tape-shaped recording medium, and accurately determining whether or not the desired stopping position is reached. The purpose of this invention is to present a method for stopping a tape-shaped recording medium that also stabilizes the stopping position.

<Description using Examples> Hereinafter, examples in which the present invention is applied to a helical scan type VT box will be described in detail.

(Description of the overall structure) FIG. 1 is a four-dimensional diagram showing the main structure of the VTR of this embodiment. In FIG. 1, 1 is a magnetic tape as a recording medium, 2 is a rotating drum, and 3a.

3b are rotary heads for recording and reproducing video signals, and heads 3a + 3b are fixed to the drum 2. 4 is a drum motor for rotating drum 2;
5 is a fixed head for recording and reproducing a cue signal (continuous wave signal for control) to be described later, and 6 is a cue signal recording and reproducing circuit.

Reference numeral 8 denotes a system controller, which supplies information on various 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 system # circuit for performing a blank search using the similarly reproduced cue signal. will be explained in detail later.

Reference numeral 11 denotes a cap that controls the capstan 13 via a capstan motor 12 in order to cause the capstan 13 to perform a desired operation based on information generated by the system controller 8 cue control circuit 9, blank search control circuit 10, etc. This is a stun 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.

16 is a cue track on which a cue signal is recorded;
It is formed at the end of the tape 1 in the longitudinal direction. VTR in this example
As shown in Fig. 2, the cue signal in this case is a minute length continuous wave signal recorded at a position corresponding to the recording start part of the video signal (shown in Fig. 2 16a), and the subsequent predetermined length is No signal is recorded (as shown in Fig. 2, 16b), and the subsequent part is configured so that the same continuous signal is recorded again. FIG. 2 is a diagram showing an example of a cue signal recording/reproducing circuit 6 configured. In FIG. 3, 31 is a clock oscillator, 32, 35, 38, 45 and 47 are resistors, 33.
34.37 and 39 are transistors, 36.44i
Each i is a capacitor, 4o is an inversion circuit (inverter), 4
1.4211: Each 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, 49 is supplied with a reproduced cue signal It is a terminal.

FIGS. 4(a) to 4(d) are timing charts showing waveforms of each part of FIG. 3M, and the operation will be explained below using FIG. 4. The above-mentioned HC is a VTR, as shown in Figure 4(a).
It is a four-level (L) signal only when in the video signal recording mode, and is a high-level (H) signal at other times.

First, the operation when recording a video signal will be explained. VTR
When HC starts recording a video signal, HC changes from H to L. Accordingly, the output of the inverter 40 changes from L to H, and the transistor 39 turns on. Accordingly, the volume 1!46 becomes in a state where it can be energized.

On the other hand, the clock signal output from the clock oscillator 31 (
4(C)), the transistor 33 is turned 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 It will be recorded on the longitudinal track 16 by the head 5 as a cue signal.

In addition, HC is supplied to the monomulti 41, and the monomulti 41
is triggered by the falling edge of HC, and outputs a very short period T as the Q output.
(as shown in FIG. 4(b)), H is obtained. mono multi 42
is triggered by the fall of the Q output of the monomulti 41, and obtains an L signal only for a predetermined period T shown in FIG. 4 Φ) as the Q output. 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 T1 period. Since the transistor 37 is off when the Q output of the monomulti 42 is H, the above-mentioned clock signal is T when recording the video signal, as shown in FIG. 4(d).
Except for the period indicated by 2, it is recorded as a cue signal.

When recording video signals, tape 1 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 of the portion 16a in FIG. 2 in the longitudinal direction of the tape to that of the portion 16b is T:T.

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 output of the transistor 3
9 is OFF, the circuit configuration of the cue head 5 is V
It is grounded from cc via 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 recorded portion of the track 16, the recorded clock signal will be recorded on the head 5's volume $46.
The signal is detected from one end of the signal, amplified by an amplifier 43, 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-described configuration, it is possible to record and reproduce cue signals as shown in FIG. 2. In the above configuration, only the same click signal is recorded and reproduced in order 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 described. First, the method of cueing control by the VTR of this example will be conceptually explained using FIG. A line 20 in FIG. 5 shows the position of the head 5 on the track 16 when the tape is fast-forwarded to find the beginning, and a line 21 shows the position when the tape is moved back early to find the beginning. ing. 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, if you want to fast forward the tape to find the beginning, point B (△2
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 a predetermined distance 1. It is detected at point 0 (Δ23) that the playback cue signal level rises again within this period, and it is determined that this portion is the beginning portion of the recorded video signal. Although fast forwarding is canceled at this timing, the head 5 actually moves to point E due to inertia based on the high speed running of the tape. 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 this case, the tape is running at low speed, so it is located close to point B (○25
), the head 5 will be located at.

On the other hand, when resetting the tape early and searching for the beginning, the distance from the falling edge to the rising edge of the playback cue signal is set to point B (Δ26).
, and if this distance is less than a predetermined distance t, the early spring return is canceled. At this time, the head moves to point A due to the above-mentioned inertia, 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 (shown at Δ22', Δ23', and Δ24'), 025
The tape is stopped when the head is positioned close to point B as shown in '.

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

In addition, when performing a cue stop, whether by early spring rewind or fast forward, the tape is fed at low speed in a predetermined direction (rewind direction) immediately before stopping. The stopping position is extremely stable. In addition, the effect of the above-mentioned inertia is small and very good cueing can be achieved.

Furthermore, the length of the unrecorded portion 16b of the cue signal is detected by always running the tape in the same direction, and since the low-speed running direction is also the same, a tape stop command is always obtained immediately before the unrecorded portion 16b. Therefore, the unrecorded part 16b
There is no instability in the stopping position due to differences in the length of the tape or the running direction of the tape. Furthermore, since the effect of inertia due to low-speed running is reduced by utilizing the above-mentioned head-blank discrimination to utilize the tape running outside, the maximum effect can be obtained by minimizing the number of steps until stopping.

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 explained in FIGS. 1 and 3 is connected to the terminal 108.
is inputted to the counter 130 via. Also, terminal 115
, 116 are fast forwarded (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 input to and output 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. As signals inputted to the control data generation circuit 128, T is an FF running start command signal, T is a reverse direction reproduction start command signal, T3 is a stop command signal, and T4 is an FR running start command signal. Further, as signals outputted from the circuit 128, T is a signal indicating the FF mode, T6 is a signal indicating the PR mode, T is a signal indicating the reverse reproduction mode, and T8 is a signal indicating the stop mode. That is, the control data generation circuit 128 has T11T,
.

Data is generated in response to command signals T, , T, and the state of the capstan motor 12 is indicated by output signals Ts, Ta, Tt, and Ta.

In FIG. 6, 111, 112, 117. 118 and 118 are respectively clock oscillators, 131 and 132 are clock oscillators, 119, 120, 126° 127, and 134.
are respectively orgate and 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 and 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 the FF cue command is supplied from the terminal 115, the 7-ripf 4 block 117 is set, and the input signal of the anti-game 109 is set to H through the or-game 120. On the other hand, an H signal is also supplied to one terminal of the AND game 121. At this time, since the tape is still stopped, T is naturally H. Nao T.

T, , T7. T and H indicate the corresponding mode. Therefore, the output of the AND gate 121 changes to H, and through the OR gate 126, T changes to H. T...
It is assumed that when each of T, , T, and T4 is H, the corresponding command is executed. Therefore, at this time, the capstan motor 12 is controlled and driven in the FF mode, and the head 5 reproduces the track 16 and outputs a cue signal.

The output cue signal is counted by a 4-bit counter 130, and when the count value exceeds 8, an H level is output from the Q terminal, resetting the 3-bit counter 110 and setting the flip-flop 111. Therefore 111 Q
An H signal is output from the terminal, and the other input of the game 109 is set to H level. On the other hand, at this time it is FF mode and T5 is H.
Therefore, through orgate 119, Antgame) 13
One input terminal of 5 is set to H.

Clock generators 131 and 132 expand during recording and playback and F
A clock with a frequency corresponding to F and F time is generated. For example, the tape speed for FF and FR is 9 during recording and playback.
If the frequency of the clock generated by the generator 132 is twice the frequency of the clock generated by the generator 131, then the frequency of the clock generated by the generator 132 is 9
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, the device is in FF mode, so it's an anime game) 135
The output of the click generator 132 is supplied to the AND gate 109 via the OR gate 134. At this time, the output of the timer 114, which will be described later, is high, and the output power of the flip 70 and the knob 111 is H.

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 clock generator 131.132
Since the frequency of the cue signal is set to be sufficiently high compared to the frequency of the clock generated by the 3-bit counter 1 while the cue signal clock is being reproduced.
The number of clocks counted by 10 is 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 3-bit counter 110 becomes H when the count value of the counter 110 is 2 and 3, and the output of the Q terminal of the 3rd bit becomes H when the count value of the counter 110 is 4 or more. When the Q terminal of the third bit becomes H, the 7-lip 70-bit 111 is set 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),
The counter 110 is no longer reset and starts counting the clock generated by the 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 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 flip-flop 112 changes to H. At this time, since the power of both AND gate 122 becomes H,
The output (T,) 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 if the tape is run for a period of tl, the Q output of the third bit of the counter 110 becomes H, and the free rough y
The Q output of the otub becomes L, and the clock no longer passes through the AND gate 109.

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

In addition, with this configuration, the counter 1 is
30, it may not be possible to stably obtain a Q output, 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 11O 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, according to point C (△23) in Figure 5, the reverse P/B mode is T,
When commanded by the capstan motor control circuit 11
The capstan motor 13 is operated to run the tape at a low speed in the opposite direction to the FF (in the direction of rewinding 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 head 5 reaches point E shown in FIG. 5 due to the aforementioned inertia.

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 inverse P/B mode is entered, the output T7 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 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, 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 R4 begins to be reproduced 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 7 lip-flop 112 also becomes H. At this time, since 'I' is H, both the AND gate 123 inputs become 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 of ○25.

Next, regarding the case where there is a PR, cue command, Fig. 5 2
Let me explain with reference to 1. PR cue command is sent to terminal 116
When the signal is supplied from the gate, the 7-lip flop 118 is set, one input terminal of the AND gate 109 is set to H through the OR gate 120, and T4 is set to H. Therefore, the capstan motor 12 is controlled and driven in the F mode. When T6 becomes H, the output of the OR gate 119 becomes H, and the output of the generator 132 becomes H.
, the OR gate 134, and the AND gate 109 to the counter 110.

When the head 5 reaches point C and the cue signal clock is no longer reproduced, the reset of the counter 110 is released, and the counter 110 counts the clock output from the generator 132 until it reaches point C (△26). It is counted 2-3 times in between. Then, when the cue signal clock is regenerated again at point B, the output of the AND gate 113 goes high.
Then, the Q output of the arbit flop 112 becomes H.

At this time, since 'v6 is H, T8 becomes H via the AND gate 125 and OR gate 126, and the FF mode is commanded. At this time, the head 5 moves to point A due to the above-mentioned inertia, and the running 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 mode switching.

In this way, the FF mode is entered, and since the subsequent operation is the same as when issuing the FFfi output command, a detailed explanation will be omitted. In addition, △22′, Δ in Fig. 5
23' and Δ24' are Δ22 and Δ23, respectively. It performs the same operation as Δ24, and the stop position 025' is also the same as ○25. j As is clear from the above explanation, the circuit configuration shown in FIG. 6 can realize cueing as described above.

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.

First, a blank search control method in the VTR of this example will be conceptually explained using FIG. 11J50 shown in FIG. 7 indicates where the head 5 is on the track 16 when performing a blank search in the FF mode, and a line 51 indicates the position when performing a blank search in the FR mode. Similarly to FIG. 5, Δ indicates each detection position, ○ indicates the final stop position, and two lines indicate high speed running of the tape.

First, in blank search in FF mode, FF
A decrease in the level of the reproduction cue signal is detected at a midpoint point Δ52) during the mode, and it is detected at point H (Δ53) that the reproduction cue signal level 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. Then, the FF is released at this timing, but as mentioned above, the head 5 becomes 1 due to inertia.
Move to the point. Then, rewind G at low speed in the opposite direction.
At point (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 (055).

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 P
Cancel R mode. At this time, due to the inertia mentioned above, F
The head 5 is moved with force until the point, then it is set to FF mode,
Through the same steps as the blank search using the OFF%-mode described above (shown at Δ52', Δ53', and Δ54'), the tape is read at the position where the head 5 is located close to point G as shown at 055'. make it stop.

If a blank search is performed using the method described above, even if the cue signal consists of only one type of 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 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 108 in FIG. 6 is supplied. Also, the terminal 215
216 are terminals into which the FF blank search command and FR blank search command are input from the system controller 8, and each command is input as a pulse signal. 201 is a detection circuit, 202, 203 and 204 are respectively input. Mono multivibrator, 205 is inverting amplifier, 216
．． 217 and 218 are delay circuits, 219.220.
221゜222, 223, 224 and 225 are AND gates, 228 is a control data generation circuit, 229゜23
0 is an or gate. Control data generation circuit 228
This circuit is similar to the circuit 128 shown in FIG. 6, and its explanation will be omitted. Note that T and ' to T8' of the circuit 228 correspond to T and to T8 of the circuit 128, respectively, and indicate similar input/output.

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 a pulse commanding an FF blank search is input from the terminal 215, the AND gate 2 is input via the OR gate 229.
24. At this time, since the tape is stopped, T and / are H. Accordingly, in response to this pulse, T,' becomes -v14H, the tape is fast-forwarded, and the head 5 traces the track 16 and outputs a reproduction cue 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 supplied to the AND gate 223 after being delayed by the delay circuit 216 by the time (τ,) required to run the tape a predetermined distance t1 during the FF operation.

After τ1 after the head 5 passes the point G, 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,
The output of the inverting circuit 205 is H. Therefore, this part (G
point) is the beginning of the unrecorded portion of the video signal (the beginning of the blank)
If so, the AND gate 223 generates a pulse at a timing of Δ53.

The output pulse of this AND gate 223 is
20 is supplied to one input terminal.

T,' is supplied to the other input terminal of the AND gate 220, but at this time T,/ is H, and the pulse indicating the beginning of this blank is the AND gate 220 and the OR gate 23.
0 to T, /. 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 device enters the stop mode, T8' changes to H, and the above-mentioned pulse indicating the beginning of the blank is supplied to one input terminal of the AND gate 222 via the minute time delay circuit 217. At this time, since T8' is again at H, 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 P/B mode and the tape begins to run in the reverse direction at low speed, and the head 15 reaches point G again (△54)
, 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 Δ54, the AND gate 221 outputs a narrow pulse, and this pulse becomes T, / through the OR gate 230. Therefore, the apparatus enters the stop mode again, but since the tape running speed is low at this time, the tape stops at a position where the head 5 is close to the G point (○55).

Next, the operation of the 8th N6 section when there is a PR blank search command 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 T4', the pulse is supplied to circuit 228 via AND gate 225 as T4'. 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 a monomulti 203tj that is triggered by the rising edge of the input generates a narrow pulse. This pulse becomes T,/ through 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 through the OR gate 229. At this time, T
, / are at H, and the AND gate 224 generates a narrow pulse as T1'. 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 OFFFF blank search described above. That is, △52' in Figure 7
, △53′.

Δ54' are respectively Δ52. △53. It performs the same operation as Δ54, and the stop position 055' is also the same as ○55.

As is clear from the above explanation, 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 minute playback due to dropout or the like, or to a drop in the cue signal level.

(Explanation of partial changes in configuration, etc.) 1. 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, it is desirable to superimpose the signals by frequency division, for example, and to configure the structure 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 PR is performed by the capstan, but it is of course also possible to perform this by driving the reel. However, in this case, since the tape running speed changes every moment due to changes in the reel diameter, it becomes extremely difficult to obtain the predetermined distance t.
It is sufficient to adopt a configuration that takes into account that , changes within a predetermined range. For example, even if the judgment criterion by the counter 110 or the delay time t 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.

As described above in detail using the embodiments, according to the present invention, the tape is The effect of inertia is reduced by running in the opposite direction at low speed.
The number of steps to stop is reduced, and the tape-shaped recording medium can be stopped quickly and stably.

[Brief explanation of drawings]

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. A diagram showing a specific example of a cue signal recording and reproducing circuit for recording and reproducing the cue signal shown in FIG. 2, FIG. 4 is a timing chart showing the waveform of the numbered part in FIG. 3, and FIG. FIG. 6 is a circuit diagram showing a specific example of the cue control circuit in FIG. 1, and FIG. FIG. 8 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 magnetic tape when cuing up. Tape running, 25.25'
50, 51 and 55' respectively indicate the stop position at the time of cueing, the tape running at the time of blank search, and the stop positions at time of blank search. No. 30 8th Kasumi (cl) Panji IW-11

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 that handles a tape-shaped recording medium in which sub-recording areas on which signals are recorded are formed in the longitudinal direction of the medium, the level of the continuous wave signal that is reproduced while the medium is running in the longitudinal direction of the medium. It is determined whether the level drop point is at a desired stop position depending on whether the drop period is within a predetermined period determined corresponding to the predetermined length, and when the point is at the desired stop position, the medium is caused to run in the opposite direction at low speed. A method for stopping a tape-shaped recording medium, which stops the medium when it reaches the drop point again.