JP2687339B2 - Continuous shooting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order. A Industrial Field B Outline of the Invention C Conventional Technology D Problems to be Solved by the Invention E Means for Solving Problems F Action G Example G ₁ Description of Overall Block Diagram of Recording / Reproducing Apparatus (No. 1) 1) G ₂ Description of continuous shooting (FIGS. 1 to 4) H Effect of the invention A Industrial field of application The present invention relates to a recording apparatus for recording a video signal or an audio signal by using a rotary head, and particularly recording The present invention relates to a so-called continuous shooting technique in which recording is performed by connecting to a completed portion. B Outline of the Invention The present invention is for erasing for erasing at least a control signal track on a tape (7) in a tape path system that goes around a guide drum to which a rotary head is attached from a supply side reel and reaches a take-up reel. A fixed head (8) and a fixed head (9) for recording / reproducing a control signal to / from the control signal track on the tape are preceded by the fixed head for erasing, and these two The distance between the heads is set to be longer than one cycle of the recording control signal on the tape, and after the recording operation is completed, the tape (7) is rewound to the fixed head (9) for the control signal by a predetermined length, and
When performing continuous shooting, the section is rewound for a predetermined length of rewind, and during this replay state, the control signal missing portion LK erased by the erasing head (8) by the fixed head (9) for recording and reproducing control signals is removed. Detecting this missing portion as the end point of the recording operation on the tape at the end of the recording operation, the control means (10) for controlling the tape (7) to perform the continuous shooting from this end point performs the continuous shooting. However, it has the feature that you can always take continuous shots correctly from the last track position of the previous recorded part even after loosening the tape tension like in stop mode. C Prior Art For example, when recording an image photographed by a video camera on a VTR, a joint photographing method is generally used to make joints for each cut inconspicuous on a playback screen. As described above, the technique of the continuous shooting in which recording is performed by connecting to a recorded portion in a VTR is described in, for example, JP-A-57-15 / 57.
No. 805 discloses this. In this technique, the capstan and the pinch roller are pressed against each other between the recording states, and the tape is tensioned, and the tape is tensioned, and the recording is paused and the pause state is established. That is, as shown in FIG. 5, when a pause operation is performed from the recording state, the pause position is not set at the operation position P ₁ but the tape is temporarily rewound from the pause operation position at a position P ₂ by a certain amount. Wait for the next recording start operation (pause release operation) after stopping. Rewinding amount from the pause operation position P ₁ at this time is a constant value in terms of the number of pulses of the control pulse. When the pause release operation is performed, a reproduction state is set, and tracking servo is performed while counting reproduction control pulses. At this time, the phase relationship between the reproduced signal and the signal to be newly recorded is controlled so that both are synchronized. When the count value of the reproduction control pulse reaches a value corresponding to the amount of return the tape winding, next position P ₃ corresponding to the position P _1, the position
A recording state than P _3. As described above, at the seam between the already recorded track and the newly recorded track, the track interval and the interval between the control signal recording traces are not irregular,
The reproduced image is not disturbed. D Problems to be Solved by the Invention The above-mentioned technique is carried out through the paused state, and since the tape is always tensioned while the tape is tensioned, the recording is actually performed after the pause is released. The tape length up to the start can be made equal to the tape rewinding amount from the pause operation point correctly, and a new recording track can be connected almost accurately from the last track of the previous recording. By the way, in the VTR, when the stop mode is set, loosen the tension and loosen the tape so that the tape does not stick to the drum. Therefore, when the capstan and the pinch roller are pressed against each other to run the tape, the tape does not always come into contact with each head from the original tape position where the stop button is pressed, but the tape is displaced. Therefore, when the record button is pressed after pressing the stop button, the track is not connected. Also, when you operate the stop button as well as when you operate the pause button, the next time you press the record button, after rewinding a certain amount from the button operation position, the actual stop state is set, and the connection shooting is performed from this point. Even if you perform the operation, a new track may not be recorded from the place next to the last track of the previous recording track due to the above-mentioned misalignment, and the last few tracks of the previous recording track may be overlapped. It may be erased by writing. E Means for Solving the Problems In the present invention, at least the control signal on the tape (7) is provided in the tape path system that goes around the guide drum to which the rotary head is attached from the supply side reel and reaches the winding side reel. An erasing fixed head (8) for erasing a track and a control signal recording / reproducing fixed head (9) for recording / reproducing a control signal on / from the control signal track on the tape are preceded by this erasing fixed head. In addition, the distance between these two heads is set longer than one cycle of the recording control signal on the tape, and after the recording operation is completed, the tape (7) is fixed to the fixed head (9) for the control signal. On the other hand, while rewinding for a predetermined length, when performing continuous shooting, the section is in the replay state during the rewinding for the predetermined length. A fixed portion (9) for recording / reproducing a trawl signal detects a missing portion LK of the control signal erased by the erasing head (8), and this missing portion is used as the end point of the recording operation on the tape for ending the recording operation. And a control means (10) for controlling the tape (7) so that continuous shooting is performed from the end point. Since the mounting distance between the F erasing fixed head and the control signal fixed head is longer than the length of one cycle of the control signal on the tape, even if there is an old recorded portion at the end of recording, the control signal track After the last control signal recording trace, the control signal recording trace is erased by the erasing head and becomes the end recording portion for one cycle or more. Therefore, the position at which the cycle of the reproduction control signal is detected and the position where the cycle has become longer is detected as the recording signal missing portion is at the end of the previous recording. Therefore, if continuous shooting is performed using this position as a seam reference, it is possible to accurately continue the recording track from the tail end of the previous recorded track even when the tape tension is relaxed, such as in the stopped state. G Embodiment G ₁ Description of Overall Block Diagram of Recording / Reproducing Apparatus FIG. 1 shows a VTR as an example of an apparatus to which the present invention is applied.
It is the whole block diagram of an example of an integrated camera. In the figure, (1) is a supply side reel, (1M) is this reel (1) drive motor, (2) is a take-up side reel,
(2M) is a motor for driving this reel (2), (3) is a drum to which a rotary head pusher is attached, (3M) is a motor for driving this drum (3), (4) is a capstan, (4)
M) is a motor for driving the capstan (4), (5) is a pinch roller, and (6) is a tension regulator. The tape (7) drawn out from the supply reel (1) goes around the tension regulator (6), is wound around the drum (3) at a predetermined angular interval, and then passes between the capstan (4) and the pinch roller (5). As a result, a tape path system leading to the take-up reel (2) is formed. Tension regulator in this tape path system (6)
On the magnetic surface side of the tape (7) between the drum and the drum (3),
A full-width erasing fixed head (8) for erasing the entire width of the tape (7) and a control signal fixed head (9) are arranged in a state where the full-width erasing fixed head (8) precedes. In this case, the interval l in the tape running direction between the full-width erasing fixed head (8) and the control signal fixed head is selected to be longer than the recording pitch of one cycle of the control signal CTL on the tape (7). I have. Reference numeral (10) is a system controller having six microcomputers (hereinafter abbreviated as "syscon"), from which reel drive signals are supplied to the reel drive motors (1M) and (2M), and the drum servo circuit (11). A drum drive signal is supplied to the drum drive motor (3M) via the, and a capstan drive signal is supplied to the capstan drive motor (4M) via the capstan servo circuit (12). Then, because of the servo, a signal PG indicating the rotation phase of the drum (3) is supplied to the syscon (10),
At the time of recording, a control signal of, for example, 30 Hz is supplied from the syscon (10) to the control signal head (4),
During playback, playback control signal from this head (9)
CTL is supplied to ciscon (10). Reference numeral (20) denotes a video signal processing circuit, which is supplied with a reproduced video signal at the time of reproduction and returns to the original video signal, which is then used as an output video signal. Also, when recording,
An input video signal to be recorded shot by a camera is supplied, signal processing for recording is performed, and this is output as a recording video signal. The playback and recording mode signals PB and REC are supplied from the system controller (10) to the video signal processing circuit (20), and switching between the recording system and the playback system is performed by the circuit (2).
0). In addition, the video signal processing circuit (2
From 0), the vertical synchronizing signal PBV extracted from the reproduced video signal during reproduction is supplied to the syscon (10), and the vertical synchronizing signal VD extracted from the input video signal during recording is supplied to the syscon (10) and used for servo. In the playback mode during continuous shooting, which will be described later, both vertical sync signals PBV and VD
Are supplied to this syscon (10) so that they are synchronized with each other. In addition, (13) is a record button switch, (14) is a stop button switch, and (15) is a pause button switch.
When these are turned on, the system controller (10) detects this and sets the device in a state corresponding to the operated button switch. G ₂ Description of continuous shooting Continuous shooting is performed as follows when the stop button switch (14) is operated in the above configuration. That is, FIG. 2 is an explanatory diagram of the movement of the tape at the time of continuous shooting, FIG. 3 is an explanatory diagram of the movement of the recording track portion of the control signal at this time, and FIG. 4 is a flowchart for performing continuous shooting. FIG. A is a flow chart when the stop mode is used, and FIG. B is a flow chart when the stop mode is changed to the recording mode. In the following, according to this flow chart, description will be made with reference to FIG. 2 and FIG. First, when the stop button switch (14) is turned on at the position T ₁ from the recording state, the capstan (4) and the reels (1) and (2) are reversed by the syscon (10) (step [101] ), And the tape (7) is returned as shown in FIG. When the tape is returned, the control signal is reproduced, and the reproduction control signal CTL is counted (step [102]). When the count value k reaches a predetermined value, in this example, k = 15 (step [103]).
The count value is reset to k = 0 (step [104]), and the capstan (4) is stopped (position T _{2 in} FIG. ₂ ). The operation up to this point is exactly the same as when the pause button switch (15) is turned on during the recording mode. However, when the stop button switch (14) is turned on, the supply side reel (1) is further changed from this state.
Is stopped, the winding side reel (2) is slightly returned, the capstan (4) is rotated, and the returned amount is sent to the drum (3) and wound on the drum (3). Loosen the part of the tape (7) that is attached (step [10
6]). Then, the pinch roller (5) is separated from the capstan (4) (step [107]). As a result, the stop state is entered. Next, when the recording button switch (13) is turned on from this stop state as shown in FIG. 4B, the tension regulator (6) pulls the loosened tape at the time of stop, and the control signal The recording head (9) and the full width erasing head (8) are rewound (step [201]). That is, as shown in FIG. ₂ , the tape (7) is returned to the position T ₃ from the position T ₂ which is in the pause state when the pause button switch (15) is turned on. Thus, when the tape (7) is stretched, the pinch roller (5) is pressed against the capstan (4) (step [20
2]), the capstan (4) is rotated forward (step [203]), and the tape (7) is transported in the forward direction. At this time, the reproduction mode is set, and the end of the previous recording track is detected by detecting the cycle of the reproduction control signal CTL (step [204]). That is, as shown in FIG. 3A, in the control signal track at the recording end position T ₁ where the stop button switch (14) is turned on, at least a portion (distance 1) after the last recording signal of the control signal ( (Shaded area)
The LK is erased by the full-width erasing head (8), and the recording signal is missing at this portion LK even if there is an old recording signal as shown in the figure. Since the tape from the position T ₁ (7) is rewound, the recording signal missing part LK is adapted to unwound position relative to the control signal head (9). Even if the tape (7) from T ₁ to T ₂ is not rewound, in the above example, the amount loosened in the stop state is pulled by the tension regulator (6) at the next recording start. Thus, the head (9) is rewound. Therefore, when the position T ₃ in the playback state, the control signal head (9) is always scans the missing portion LK. Here, the distance 1 is longer than the period τ of the recording signal of the control signal. Therefore, the missing portion LK can be detected by detecting the cycle of the reproduction control signal CTL and detecting that the detection cycle is one cycle τ or more. The detection method is, for example, a trigger type monostable multivibrator with a time constant slightly longer than one cycle τ triggered by the reproduction control signal CTL, and its Q output is low when the cycle of the signal CTL is longer than τ. You can take advantage of getting down to the level. Further, a counter may be used instead of the monostable multivibrator. In other words, the counter is reset by the signal CTL, and the count value of the clock from reset to reset is detected.
Can be detected as Thus, when the missing portion LK is detected (step [20
5]), the capstan (4) reverses from the position T ₄ (step [206]), the signal CTL is counted (step [207]), and the count value k = 15 is returned (step [206]). 208]), the count value k is reset to 0, the capstan (4) is rotated forward from the position T ₅ (step [210]), and while the reproduction control signal CTL is being counted (step [211]), reproduction is performed. When the mode is entered, the signal to be recorded next and the reproduced signal are locked in phase (step [212]). Then, when the tape (7) advances by the amount of the tape (7) returned from the position T ₄ , that is, when the position T ₆ of k = 15 is reached (step [21
3)) and reset the count value k (step [21
4)), the recording mode starts from this position T ₆ (step [2
15)). Motion and VTR mode after the tape from the position T ₄ is
Pause button switches from the recording state at the position T ₄ (1
5) Turn on is the same as when the pause release from the pause state at the position T _5. And in this case, the position T ₄
Since is the position just at the end of the previous record, it is possible to accurately take a continuous shot from the end of the previous record even when taking a continuous shot from the stopped state. In the above, continuous shooting from the stopped state is taken as an example, but the present invention is not limited to the stopped state and can be applied to any case where the tape tension is loosened after the end of recording. Further, even after the recording is completed and after the fast-forwarding and rewinding state is set, the continuous recording can be accurately performed by detecting the recording signal missing portion LK. As described above, in the stop state as in the above example, the tape is fed out from the take-up reel side to loosen the tension, and when the recording operation is started thereafter, the loosened portion is used as the control signal head ( Rewinding to 9) does not require rewinding from positions T ₁ to T ₂ in FIG. Further, in the example shown in the figure, the control signal track is erased by the full-width erase head (8), but the erase head may be provided only for the control signal track. It is sufficient that the erasing head and the control signal head are separated by a distance of 1 or more. The erasing head is located on the supply reel (1) side and the control signal is located on the take-up reel (2) side across the drum (3). A head may be provided. Further, the present invention is not limited to the video signal recording / reproducing apparatus, but can be applied to all rotary head type helical scan type recording / reproducing apparatuses. As described above, according to the present invention, the interval between the control signal head and the erasing head is set longer than the recording trace for one cycle of the control signal on the tape, By detecting the missing portion where the control signal does not exist for longer than a minute, the end of the previous recording track is detected, and since continuous shooting is performed using this end as a joint, after the previous recording is completed, Even if the tape tension is loosened, when recording is restarted, a new track can be correctly formed with the track intervals aligned from the end of the old track. That is, according to the present invention, continuous shooting from a stopped state or the like can be favorably performed without erasing the previous recording track at all.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an outline of an example of a recording / reproducing apparatus for explaining an embodiment of the present invention, and FIGS. 2 and 3 are for explaining continuous shooting according to the present invention. Figure, Figures 4A and B
Is a flow chart for explaining an example of the present invention, and FIG. 5 is a view for explaining an example of a conventional continuous shooting. (8) is a full-width erasing head (9) is a fixed head for control signals, and (10) is a syscon.

Claims (1)

(57) [Claims] In the tape path system that goes around the guide drum to which the rotary head is attached from the supply side reel and reaches the take-up reel, at least the fixed head for erasing the control signal track on the tape and the control signal track on the tape The control signal recording / reproducing fixed head for recording / reproducing the control signal is preceded by the erasing fixed head, and the distance between these two heads is one cycle of the recording control signal on the tape. After the recording operation is completed, the tape is rewound for a predetermined length on the fixed head for the control signal after the recording operation is completed.
During the reproduction state, the control signal recording / reproducing fixed head detects a missing portion of the control signal erased by the erasing head, and uses the missing portion as a recording operation end point on the tape at the end of the recording operation. And a control unit for controlling the tape so that the continuous shooting is performed from the end point.