JPH0325743A - Automatic program search device - Google Patents

Abstract

PURPOSE:To simplify the program search operation of a tape by automating the search operation of a time code value representing a tape position desired to stop and input operation of the time code value, by providing a black burst signal detection circuit and a stop position control circuit. CONSTITUTION:A reproduced video signal is inputted from a video tape recorder 1 to the black burst signal detection circuit 3 via a video signal input terminal 5. Here, it is assumed that the front end of an event is designated as a stop position and the present reproducing position of the tape is set at an event 1. At this time, when a queue-up command is supplied to the stop position control circuit 4, the stop position control circuit 4 operates the tape recorder, and advances the tape. When the black burst signal detection circuit 3 detects the passage of the tape through the front end (position (b)) of an event 2, the time code value at that moment is inputted from the recorder 1, then, is stored in the stop position control circuit 4. Next, the recorder 1 is stopped, and the tape is rewound until the time code value representing the position (b) can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic cue device that is connected to a video tape recorder and controls the tape to quickly cue the beginning of the tape.

2. Description of the Related Art In recent years, with the widespread use of video tape recorders, a variety of control devices have been used.

A conventional automatic cue device will be described below with reference to the drawings. FIG. 3 is a block diagram of a conventional automatic cue device, in which 1 is a video tape recorder, 2 is an automatic cue device, and 3 is a stop position control circuit provided in the automatic cue device.

Regarding the conventional automatic cueing device constructed in this way,
Its operation will be explained below. The operator inputs a time code indicating the tape position at which the tape is to be stopped as stop position information into the automatic cue device@2. With automatic cueing device,
Store this time code value. Next, when the operator gives a cue up command to the automatic cue device, the stop position control circuit 3 operates the video tape recorder 1 to stop the tape at the designated position.

Problems to be Solved by the Invention However, in the above structure, it is necessary to search for a time code value indicating the tape position where the tape is to be stopped and to input that time code value, making the operation complicated. It had become a thing.

Means for Solving the Problems In order to eliminate such conventional drawbacks, the automatic cueing device according to the present invention includes a black burst signal detection circuit for searching for the tape position to be stopped, and a black burst signal detection circuit for searching for the tape position to be stopped. and a stop position control circuit for determining the indicated time code value and stopping the tape at a designated position.

As a result, the work of searching for a time code value indicating the tape position at which the tape is desired to be stopped and the work of inputting that time code value are automated, and it becomes possible to locate the beginning of the tape with a simple operation.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. Figure WIJ2 shows a diagram of an automatic cueing device in one embodiment of the present invention. In FIG. 2, 1 is a video tape recorder, 2 is an automatic cue device, 3 is a glass burst signal detection circuit, and 4 is a stop position control circuit. It is built into the automatic cueing device 2. Further, 6 is a video signal input terminal, and 6 is a control signal input/output terminal.

The video tape recording format necessary for the operation of the automatic cueing device of this embodiment constructed in this way will be explained. FIG. 3 is a schematic diagram showing the video tape recording format. In Figure 3, 1
is a video tag, 2 is a guard band that separates each event, and a black burst signal is recorded. Each event was recorded on three tapes.

Next, the operation of the automatic cue device of this embodiment will be explained. In FIG. 2, a reproduced video signal from a video tape recorder 1 is inputted to a black burst signal detection circuit 3 through a video signal input terminal 6. The black burst signal detection circuit 3 detects whether or not the input video signal is a black burst, converts the result into a binary logic signal, and outputs the result to the stop position control circuit 4. The stop position control circuit 4 allows several settings to be made by the operator. The setting is the guard band (2 in Figure 3).
) and the number of consecutive frames of the black burst signal for detecting the event, and whether the leading edge of the event is the stopping position or the trailing edge of the event is the stopping position. The stop position control circuit 4 controls the video tape recorder 1 through the control signal input/output terminal 6, and has the function of stopping the tape at a designated position using the playback time code value.

Assume that the leading end of the event is specified as the stop position, and the current playback position of the tape is event 1 (the position shown in FIG. 3a). Here, when the operator gives a cue up command to the stop position control circuit 4, the stop position control circuit 4 operates the video tape recorder 1 to advance the tape. The black burst signal detection circuit 3 monitors the reproduced video signal and notifies the stop position control circuit 4 that the tape has passed the front end of event 2 (the position shown in FIG. 3b). The stop position control circuit 4 obtains the time code value at this moment from the video tape recorder 1 through the control signal input/output terminal 6 and stores it. Next, video tape recorder 1
and rewind the tape until the tape obtains a time code value indicating the leading edge of event 2 (position in Figure 3b).

This means that you can cue the tape to the target position.

Effects of the Invention As described above, in the present invention, by introducing a black burst signal detection circuit, an automatic cueing device that can easily cue the beginning of a tape is realized.

In addition, in this example, the tape is cued at the target position in front.
Although we have described the case of moving up, it goes without saying that it is also possible to move to a rear target position. Furthermore, it is also possible to skid several events and to slightly modify the target stop position on a frame-by-frame basis.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an automatic cue device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a video tape recording format necessary for the automatic cue device of this embodiment to operate. 3 are block diagrams of a conventional automatic cue device. 1...Video●Tape゜●Recorder, 2...
... Automatic cueing device, 3 ... Black burst signal detection circuit, 4 ... Stop position control circuit, 6
...Video signal input terminal, 6...Control signal input/output terminal.

Claims (1)

[Claims] A detection circuit for detecting a black burst signal output from a video tape recorder during playback; An automatic cue device comprising: a control circuit for stopping a tape;