JPS62157486A - Retrieving signal recording method and device for one frame photographing vtr - Google Patents

Abstract

PURPOSE:To retrieve more rapidly an image recorded by one frame photographing VTR by recording a video signal to the video track of a magnetic tape when a tape is in a still state, using a cue head, and recording a retrieving signal to the cur track of a magnetic tape at the time of travelling the tape. CONSTITUTION:When a one frame recording command signal A is inputted to a terminal 40, a system control circuit 10 operates a video signal processing circuit 26 for the period of 'High' shown in a signal C and the video signal is recorded to a video track 32. When the recording of the video signal is completed, the system control circuit 10 operates a capstan motor driving circuit 14, travels a magnetic tape 11 and the constant speed is obtained. At such a time, a tape travelling speed detecting circuit 16 detects it and sends a signal D to the system control circuit 10. During the High of the signal D, the system control circuit 10 records the retrieving signal and the control signal to a cue track and a control track respectively. Namely, even when the magnetic tape is in a still state and travels, the retrieving signal is recorded so that the retrieving signal can be detected always.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a search signal recording method and apparatus for a single-frame VTR that records one frame while the tape is stationary.

[Prior Art] There is a single-frame VTR that feeds a magnetic tape intermittently and records a video signal when the tape is stationary. In such a VTR, a method has been proposed in which a control signal for frame advance is recorded on a control track while the tape is running (Japanese Patent Laid-Open No. 56-65581).

On the other hand, in order to facilitate retrieval with a normal VTR, there is a method of recording a tape address on a cue track as tape position information. There is also a method of inserting a tape address into a vertical blanking period so that accurate tape position information can be obtained even when the tape is stationary.

[Problems to be Solved by the Invention] When video signals are recorded frame by frame on a magnetic tape, it is thought that there is almost no correlation between adjacent videos. However, compared to continuous recording or frame-drop recording at regular intervals, visual image retrieval is difficult.
It is very time consuming and difficult.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a search signal recording method and apparatus that allow images recorded by a frame-taking VTR to be searched more quickly.

[Means for solving the problem] The search signal recording method and device according to the present invention basically have the following features:
When the tape is stationary, a video signal with a search signal inserted into the vertical blanking W4 is recorded on the video track of the magnetic tape, and when the tape is running, the cue head is used to record the search signal on the cue track of the magnetic tape. . Further, the device according to the present invention includes a video signal processing circuit that inserts a search signal into the vertical blanking period of the video signal,
Further, a search signal generation circuit for generating this search signal is provided.

[Function 1] In the present invention, when recording one frame while keeping the magnetic tape stationary, a search signal is inserted into the vertical blanking period of the video signal to be recorded, and the tape runs and comes to a standstill again in preparation for the next recording. In the meantime, a search signal is also recorded on the cue track. Then, when the tape is stationary, the search signal of the vertical blanking period is used, and when the tape is running, the cue signal is used.
Use track search signals. As a result, - Komatori V
Images recorded in TR can be searched quickly and easily. Note that the search signal referred to here is, for example, the IEc standard's commonly known SMPTE time code, or the SM
PTE recommended standard VITC (vertical interval
time code).

[Example] Hereinafter, the present invention will be described with reference to drawings illustrating an example of the present invention.

FIG. 1 is a block diagram showing the configuration of a recording apparatus according to the present invention.

In FIG. 1, 10 is a system control circuit that centrally controls the entire illustrated circuit. A capstan motor 12 that feeds the magnetic tape 11 intermittently is driven by a capstan motor drive circuit 14. The tape running speed detection circuit 16 detects the running speed of the magnetic tape 110 and outputs a tape running speed signal.

The magnetic tape 11 has a cue track 18 and 20
is a cue head that records a search signal on this cue track 18. Reference numeral 22 denotes a search signal generation circuit that generates a search signal in response to an instruction from the system control circuit 10. A search signal recording circuit Wr24 receives the search signal from the search signal generation circuit 22 and outputs the search signal to the queue head 20. Record the search signal. The video signal processing circuit 2G inserts the search signal from the search signal generation circuit 22 into the vertical blanking period of the video signal input to the video signal input terminal 28 according to instructions from the system control circuit 10. Recording circuit 29
receives the output of the video signal processing circuit 26, excites the video head 30, and outputs the video track 32 of the magnetic tape 11.
record the video signal. A control head 34 records control signals on the control track 36 of the magnetic tape 11. 38 is a control signal recording circuit that supplies control signals to the control head 34 in accordance with instruction signals from the system control circuit 10.

The system control circuit 10 receives a one-frame recording command signal from a terminal 40 for performing a -frame recording operation and a tape running speed detection circuit 1.
The capstan motor drive circuit 14, the search signal generation circuit 22, the video signal processing circuit 26, and the control signal recording circuit 38 are controlled based on the tape running speed signal outputted from the tape running speed signal output from the tape drive circuit 6.

Next, the operation of the first illustrated device will be explained. magnetic tape 11
is intermittently sent by the capstan motor 12 driven by the capstan motor drive circuit 14. - When recording a frame, the capstan motor 12 is stopped in response to a command from the system control circuit 10 to make the tape 11 stand still. - When a single frame recording command signal is input to the frame recording command signal input terminal 40, the system control circuit 10 activates the search signal generation circuit 22 to generate a search signal, and also activates the video signal processing circuit 26. Put it into working condition. The video signal processing circuit 26 inserts the search signal from the search signal generation circuit 22 into the vertical blanking period of the video signal input to the video signal input terminal 28, and outputs the video signal to the recording circuit 29.
send to The recording circuit 29 records the video signal into which the search signal has been inserted onto the video track 32 of the magnetic tape 11 using the video head 30.

- When frame recording is completed, the system control circuit 10 sends a drive command to the capstan motor drive circuit 14 to cause the magnetic tape 11 to run. The tape running speed detection circuit 16 is
The tape running speed is detected by detecting the rotational speed of the capstan motor 12, and tape running speed information is sent to the system control circuit 10.

In accordance with this tape running speed information, the system control circuit 10 causes the search signal generation circuit 22 to send a search signal to the search signal recording circuit 24 when the tape running speed becomes constant. The search signal recording circuit 24 records a search signal on the cue track 18 of the magnetic tape 11 using the cue head 20. At the same time, the system control circuit 10 sends a command to the control signal recording circuit 38 to record a control signal on the control track 36 of the magnetic tape 11 using the control head 34.

The recording of the search signal on the cue track 18 and the recording of the control signal on the control track 36 are performed as follows.
This is done while the tape 11 is running at a constant speed.

After the recording of the search signal and the control signal is completed, the system control circuit 10 starts the capstan motor drive circuit 1.
A stop command is sent to the magnetic tape 4 to stop the running of the magnetic tape 11. This completes the preparation for recording the next frame.

FIG. 2 shows the timing of operation of each part of the first illustrated device. A is a one-frame recording command signal input to the one-frame recording command signal input terminal 40, B is the running speed v of the magnetic tape 11, and C is
1 shows a signal processing circuit operation command signal which is the output of the system control circuit 10 which operates the video signal processing circuit 26, and D shows the output of the tape running speed detection circuit 16.

When the one-frame recording command signal A is input to the terminal 40, the system control circuit 10 operates the video signal processing circuit 26 during the High period indicated by the signal C to record the video signal on the video track 32. After recording the video signal,
The system control circuit 10 is a capstan motor drive circuit 1
4 to run the magnetic tape 11, the tape running speed gradually increases as shown at B in FIG. 2, and finally reaches a constant speed. When the tape running speed becomes constant, the tape running speed detection circuit 16 detects this and sends a signal to the system control circuit 10. During the high period of the signal, the system control circuit 10 causes the search signal and the control signal to be recorded in the cue track and the control track, respectively. When the recording of the search signal and control signal to the cue track and control track is completed, the system control circuit 10 sends a stop command to the capstan motor drive circuit 14 to decelerate the tape running and stop the tape 11 (the first Figure 2B). Thereafter, a similar one-frame recording operation is performed.

[Effects of the Invention] According to the present invention, since the search signal is recorded so that it can always be detected whether the magnetic tape is stationary or moving, images recorded by a frame-taking VTR can be easily searched. can do.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows the timing of operation of each part of the device shown in FIG. 10... System control circuit 11... Magnetic tape
12... Capstan motor 14... Capstan motor drive circuit 16... Tape running speed detection circuit 18... Cue track 20... Cue head 22... Search signal generation circuit 24. ...Search signal recording circuit 26...Video signal processing circuit 28...
Video signal input terminal 29... Recording circuit 30... Video head 32... Video track 34... Control head 36... Control track 38... Control signal recording circuit 40...
-Frame recording command signal input terminal A...-Frame recording command signal 8...Magnetic tape running speed C...Video signal processing circuit operation command signal D...Output signal of tape running speed detection circuit 16

Claims (2)

[Claims] (1) A single-frame VTR that drives a magnetic tape intermittently and records one frame of a video signal when the magnetic tape is stationary.
When the tape is stationary, a search signal is inserted into the vertical blanking period of the video signal, and the video signal is recorded on the video track of the magnetic tape, and when the tape is running, the search signal is inserted into the video track of the magnetic tape. A search signal recording method for a single-frame VTR, characterized by recording on a track. (2) In a single-frame VTR in which a magnetic tape is driven intermittently and a video signal is recorded when the magnetic tape is stationary, a cue head faces a cue track of the magnetic tape and generates a search signal in accordance with a command. a video signal processing circuit that inserts the search signal from the search signal generation circuit into the vertical blanking period of the video signal; and a video signal processing circuit that applies the search signal from the search signal generation circuit to the cue head when the tape is running. a control circuit that records the search signal on the cue track, and when the tape is stationary, puts the video signal processing circuit into operation and records the video signal containing the search signal on the video track of the magnetic tape during the vertical blanking period; A search signal recording device for a single-frame VTR, which is characterized by: