JPH10228761A - Tape time retrieving function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To understand the recording time of a portion where a recorded content is changed so as to perform quick and accurate retrieving by recording a marker detected for each change of the recorded content during recording, reproducing the marker detected during retrieving and reading recording time data before and after the detected marker. SOLUTION: A video signal and recording date data are recorded in the oblique track of a magnetic tape 4 and a marker is recorded in a CTL track. Regarding markers, there are a recording starting time marker 14, switching time markers 15 and 16 and a finishing time marker 17. It is now assumed that the magnetic tape 4 is stopped in a tape position A18 and 14:40 of July 5. Then, for retrieving 11:50 of July 5, this position is estimated as a tape position C20 and rewinding is started. At this time, since the maker 15 is detected at the changing point of a recorded content, the rewinding is suspended and, in a reproducing state, date data before and after the maker are read. Thus, it is determined that the recording of 11:10 of July 5 is not in the tape position C20 but in a position D21, and stopping is made in a normal position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tape time search function.

[0002]

2. Description of the Related Art As shown in a video salon, April 1996, pages 84 and 85, for example, a VTR main unit stores recorded contents of a tape. The search was performed based on the recorded data stored in the main body of the VTR.

When a time position of a tape recorded by another VTR is searched by applying this system, time data is recorded and reproduced in a frame of a video signal to be recorded.
The search is repeatedly performed by estimating the time position of the tape to be searched from the first position, sending the data by fast-forward / rewind, reproducing the tape again, reading the time data of the tape, and estimating the search position.

[0004]

As described above, according to the conventional search technique, only the tape recorded by the VTR can be accurately searched. Or, apply this system to other V
When searching for a tape recorded by TR, if the recorded content changes during fast-forward / rewind from the initial position to the estimated position, the contents of the estimated position become completely different data. It was necessary to start over, and it took time, and in some cases, the search became impossible.

An object of the present invention is to search for tapes recorded by another VTR, and to quickly grasp the contents of the change and correct the estimated position even if the recorded contents change while moving to the estimated position. It is in doing an accurate search with.

[0006]

When searching for a tape recorded by another VTR, when the recorded content changes during recording,
At the change point, a marker that can be detected by fast-forward / rewind is recorded. At the time of search, when the marker is detected, it is reproduced and the recording time data before and after the marker is read, so that the recording time of the tape at the changed portion can be grasped. Can be achieved by correcting the estimated position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A system for recording a recording date and time on a VTR as recording time data and searching for a designated recording date and time will be described below with reference to FIGS. 1, 2 and 3. FIG.

FIG. 1 is a block diagram showing the configuration of the present invention.

The video signal input from the video signal input 1 is sent to the rotary head 3 together with the recording date / time data 9 output from the microcomputer 6 by the video signal circuit 2 and is recorded on the magnetic tape 4. The CTL data and marker output from the microcomputer 6 are sent to the CTL amplifier 7 and recorded on the magnetic tape 4 by the CTL head 8. FIG. 2 is a diagram showing a recording pattern on the tape of the present invention.

On the magnetic tape 4, recording date and time data 9 are recorded on a diagonal track together with a video signal. Also, C
The CTL and the marker 10 are recorded on the TL track.

FIG. 3 is a recording example showing an embodiment of the present invention.

Recording A11 recorded from 9:20 on July 5 to 11:20 on July 5 in the magnetic tape 4 as shown in FIG. 3, and 15:00 from 14:00 on July 5 as shown in FIG. Day 14: 5
It is assumed that three types of recordings are recorded: recording B12 recorded until 0 minute, and recording C13 recorded from 16:20 on July 7 to 19:10 on July 7.

The data of the oblique track includes data of the recording date and time, and the CTL has a marker A14 at the start of recording, a marker B15 and a marker C1 at the time of switching.
6. At the end, the marker D17 is recorded.

It is assumed that the magnetic tape 4 stops at the tape position A18. When the magnetic tape 4 is inserted into the VTR, the VTR automatically reproduces and reads the date and time data at that position. Assume that the tape position A18 is 14:40 on July 5th.

First, as an example in which the recorded content does not change during the search, it is assumed that the search date and time is set to 14:20 on July 5th.

The VTR is 7 times longer than the time at the tape position A18.
The position at 14:20 on March 5 is estimated as the tape position B19, rewinded, and stopped at the tape position B19. Therefore, the content is reproduced and confirmed that it is 14:20 on July 5, and the search is terminated.

Next, as an example in which the recorded contents change during the search,
It is assumed that the search date and time is set to 11:00 on July 5 from the position of the tape position A18. The VTR estimates the position of 11:00 on July 5 as the tape position C20 from the time of the tape position A18, and starts rewinding.

If the marker is not provided, the tape is fed to the tape position C20 and reproduced, and the date and time data is read therefrom. I have to start over.

When the marker of the present invention is recorded,
Since the marker B15 is detected at the transition of the recorded content, rewinding is interrupted there, and the date and time data before and after the marker are read in the playback state. Thereby, it is known that the recording at 11:00 on July 5 is not at the tape position C20 but at the tape position D21, and the recording can be stopped at the correct position. If the date and time data before and after the marker is read and it is found that there is no date and time that the user wants to search, a search impossible is displayed to inform the user. In this case, if there is no marker, it cannot be determined whether or not the user wants to search for the date and time, and the search is repeated many times.

[0020]

According to the present invention, a change in recorded contents can be determined by setting a marker that can be detected even in fast-forward / rewind, so that a correct search can be performed quickly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is an explanatory diagram showing a recording pattern on a tape of the present invention.

FIG. 3 is an explanatory diagram of a recording example showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Video signal input, 2 ... Video signal circuit, 3 ... Rotating head, 4 ... Magnetic tape, 5 ... Operation part, 6 ... Microcomputer, 7 ... CTL amplifier, 8 ... CTL head, 9 ... Recording date and time data.

Continued on the front page (72) Inventor Yuji Sato 1410 Inada, Hitachinaka-shi, Ibaraki Pref. Hitachi, Ltd. Visual Information Media Division

Claims (2)

[Claims] 1. A tape recorder for recording a signal by using a rotary head, a system for recording and reproducing data relating to a recording time in a signal to be recorded, and searching for a time position of a tape based on the data. A tape time search function, characterized in that a marker that can be detected even during fast-forward or rewind is recorded at the end of the recorded content, and a recording time position is searched using data related to the recording time and the marker. 2. A tape time search function according to claim 1, wherein a non-signal portion for a predetermined time is recorded at a change of recorded contents, and is used as a detection marker during fast-forward and rewind.