JPH0695407B2 - Cue signal writing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cue signal writing device used in a cue search device such as a video tape recorder (VTR).

(Prior Art) Conventionally, VISS has been used to perform cue in VHS type VTR.
Signals and cue signals such as VASS signals are used. The recording length required to write this type of cueing signal has a length of several seconds when converted to the reproduction time.

(Problems to be Solved by the Invention) However, the writing position of the cue signal in this cue signal writing device is written after the cue target position as a starting point. Therefore, when performing a cue search, the detection of the cue signal is delayed by the recording length of the cue signal, and there is a problem in that reproduction is performed with a shift from the position where the cue should be originally performed.

(Means for Solving Problems) A cueing signal writing device of the present invention is a device for searching for a cueing signal written in advance to perform cueing, and when cueing the cueing signal, cueing is performed. Rewind from the cue target position for the length of the recording length of the signal and the length of the stable time until the traveling stabilizes when moving from the rewind state to the playback state, and then rewind the stable time. It is provided with a write control unit that starts writing with a delay of a long time.

(Function) When writing the cue signal, the cue is recorded for the length of the record length of the cue signal and the length of the stable time until the traveling stabilizes when the rewind state is changed to the playback state. Rewind from the target position, and use this rewound position as the writing start point. When actually writing, the writing is started with a delay of the stable time length. As a result, at the time of the cue search, if the tape is run at a high speed and the cue signal is detected and then the reproduction mode is set, a reproduction screen from a target scene can be obtained.

(Example) Hereinafter, the Example of this invention is described with reference to drawings.

FIG. 1 is a schematic diagram showing an embodiment of a cue signal writing device according to the present invention. This example shows a case where it is applied to a VTR.

Reference numeral 1 is a video cassette, 2 is a video head drum, 3 is a video tape, 4 is a control head, and this control head 4 writes a cue signal such as a VISS signal and a VASS signal used for cue control on a control track. And read. The writing / reading control unit 5 controls writing and reading of the cueing signal.
Is. The write / read controller 5 operates in cooperation with a system controller (not shown) that controls the overall system of the VTR. The tape running controller 6 controls the tape running in accordance with the control states of the writing / reading controller 5 and the system controller.
The driving speed is controlled to one of three predetermined speed modes (reproduction mode, fast-forward mode, rewind mode). Then, at the time of writing the cue signal, the reproduction mode and the rewind mode are automatically switched, and at the time of the search reproduction of the cue signal, the fast forward mode or the rewind mode and the reproduction mode are automatically switched.

FIG. 2 is a schematic diagram of a tape for explaining the write operation of the cue signal. The cue signal is a VISS signal and a VASS signal, and when the recording length is converted into the reproduction time, it is 2.1 seconds and 3.1 seconds. In the drawing, the right end indicates the tape end side, the cue target position of the VISS signal is indicated by reference numeral 9a, and the cue target target position of the VASS signal is indicated by reference numeral 10a.

In FIG. 2, when the writing of the cue signal is activated, the writing / reading control unit 5 causes the tape running control unit 6 to operate.
On the other hand, the rewinding mode is set for the rewinding time corresponding to the recording length of the cueing signal, and the control head 4 is moved from the target positions 9a and 10a by 2.1 seconds and 3.1 seconds in the playback time.
Return to b, 10b. Then, when the tape running control unit 6 finishes this rewinding mode, it then issues a playback mode command.
Then, the writing of the cueing signal is started from the positions indicated by reference numerals 9b and 10b. By the way, in the actual mechanism, since it takes some time for the traveling to stabilize after the rewinding state is changed to the regenerating state, the rewinding amount is increased by that amount (stable time), and the writing start is also accompanied by it. By delaying by the stable time length, stable writing of the cue signal is performed, and the writing end position of the cue signal is made to coincide with the target position. Then, when performing a cue search based on the cue signal written as described above, the video tape 3 is run at high speed in the rewind mode or the fast-forward mode, and when this cue signal is detected. Control the playback mode. As a result, the reproduction screen is obtained from the target positions 9a and 10a.

(Effects of the Invention) The cue signal writing device of the present invention adds the recording length of the cue signal and the stable time length until the traveling is stabilized at the time of shifting from the rewinding state to the reproducing state. It is configured to rewind from the cue target position by the length and then start writing after delaying by the stable time length, so that the detected position during cue search matches the cue target position. , It is possible to perform a cue search accurately with a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a cue signal writing device according to the present invention, and FIG. 2 is a schematic diagram of a tape showing a cue signal writing state. 4 ... Control head 5 ... Writing / reading control unit 6 ... Tape running control unit 9a ... VISS signal cueing target position 10a ... VASS signal cueing target position

Claims (1)

[Claims] 1. An apparatus for searching for a cueing signal that has been written in advance to perform cueing, wherein at the time of writing the cueing signal, a recording length of the cueing signal and a transition from a rewind state to a playback state are performed. It is provided with a writing control unit that rewinds from the target position for cueing for a length including a stable time length until the traveling is stabilized, and then starts writing after delaying by the stable time length. And a cue signal writing device.