JPS60167184A - Method for recording tape location information - Google Patents

Abstract

PURPOSE:To enable a continuous search for getting a head part of a program by repeatedly recording an existing program location information and preceding a program location information program on a digital information recording track on the extention line of a video track. CONSTITUTION:A specific mode consisting of a program No., hour, minute and second in each of PCM track PT 1D-0-1D-5. A program No. and hour.minute. second from a tape T start point to track Ptau1 are recorded on the track Ptau1 of an area Y. No. and hour.minute.second from the tape start end up to the first track of each of the programs are orderly recorded repeatedly one by one. By designating a desired program No., the system calculates tape amount (hour. minute.second) to be shifted and automatically detects program heads of the designated No.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape position information recording method for recording tape position information on a videotape.

As the number of programs recorded on video tape by a video tape recorder (VTR) increases, it becomes extremely difficult to search for a desired program from among the recorded programs and play it back from the beginning.

Conventionally, programs have been cued using the following three methods.

One of these is a system in which the program interval between the recording end of a program and the recording start of the next program is an unrecorded blank section, and the presence or absence of this blank section is detected to locate the beginning of the desired program. It is. In this method, in order to specify the desired program to cue, check the contents of the current program, and then check how many programs ahead or after the current program the desired program is. It is necessary to input the information from the outside,
In addition to the disadvantages that the operations are complicated and easy to make mistakes, there is also the disadvantage that it is difficult to automatically search among a large number of programs and locate the beginning of a large number of programs in succession.

The other method is to record a cue signal for starting the program in a cue trunk provided along one edge of the video tape in the longitudinal direction, or to record a cue signal for starting the program. Minutes and seconds are continuously recorded and this signal is read in the cue search state to locate the beginning of a desired program. Among these methods, the signal processing for cueing using only cue signals is substantially the same as the first method, and the method for reading hours, minutes, and seconds is substantially the same as the third method below. However, apart from the purpose of use by professionals, for consumer use, it imposes a heavy burden on the user and has problems in practicality.

A third method is to perform V I T C (VerticalIn) corresponding to each of the video tracks on the videotape.
Record the Level Time Code).
Among these recorded VITCs, a search is performed by specifying the VITC corresponding to the end of the program, and in addition to being able to perform automatic cueing, the feature is that automatic continuous search function can be performed freely even between many programs. be. However, the trunk of a VTR generally uses the NTSC system and has a rate of 60 lines per second, and an hourly recording tape has a rate of 21,600 lines per second.
Since it has 0 trunks, it is necessary for the user to record a large number of VITCs in each trunk and to memorize a counter value based on the VITC at the start of each program, so VTRs for professionals are Apart from that, there are still problems with its practicality for consumer use.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional ones, and makes it possible to perform a continuous search to find the beginning of a large number of programs, make the VTR easier to use for the user, and position the tape suitable for general consumer use. Its purpose is to provide information recording methods.

The method according to the present invention has been made to achieve the object,
In a videotape having a digital information recording trunk usable for recording digital information provided on an extension of a video track recorded and played back by a rotary head, said digital information on an extension of the video trunk on which a program is recorded. It is characterized in that position information regarding the current program and position information regarding previous programs are repeatedly recorded on the recording track.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows the trunk configuration of a videotape in which tape position information is recorded by the method of the present invention. This videotape is a cassette of approximately the same size as an audio compact, and is used to record 1 hour and 30 minutes. A standard has recently been announced for 8mm video, which has the potential to provide better image quality than current VTRs. A cue trunk Cu and an audio trunk Au are provided on both edges of the tape T along its longitudinal direction, and a fixed head is associated with each of these trunks.

In the central part of the tape T, as shown in FIG.
A large number of PCM) racks (pv) scanned by a rotation of about 30 degrees are provided tilted at a predetermined trunk angle. A video signal for one field (A frame) is recorded in one video trunk VT.

The rotary hands HRt and H*a are shifted up and down by one trunk, and scan two adjacent tracks with a 180° shift.

Therefore, the head switching pulse (H3WP) as shown in FIG. 3 is transmitted to the switching means S as shown in FIG.
By applying it to the control inputs of the switching means SWI, SW2, the preamplifier A is applied to the inputs of the switching means SWI, SW2.
+, rotational hand HRI applied via At, H11
The video signal and PCM signal in the output of No. 2 (Fig. 3) are output terminal TO+.

It is separated into "1" and "2" and output. That is, switching means SW1. SW2 is HS W P
By switching to the state shown by the solid line in FIG. 4 by the L level, and by switching to the state shown by the broken line by the H level,
2 adjacent rotation hands H11t and Ho2 by one rotation
The video signal on the two video trunks Pv is output to the output terminal T.
continuous output from o r, two PCM) rack P
↑The above PCM signal is output from the output terminal T o a.

The above explanation has been made regarding the case of reproducing the recording on the video tape, but when recording the video signal and PCM signal on the video tape, the rotary head l (Rl + HRt
The application of the recording signal to the recording signal may be alternately switched to perform the reverse of the above-mentioned reproduction.

As shown in FIG. 5, the PCM) rack P↑ consists of a clock run-in a, a data area b, an after-record margin C, and the like. The total amount of data that can be recorded in the PCM data area b is 14,124 bits, within which six index (ID) areas are provided. Each ID is ID-0, ID-1, ID-2 and ID-
3.■ It is composed of D-4 and ID-5, respectively, and is determined so that the address of the trunk can be determined by reading a combination of all or part of these six ID-0 to ID-5. ing. Currently considered addresses include (1) hours, minutes, seconds, and
There are frame magnets, (2) recording date and time, and (3) program information.
It is supposed to be recorded in the area.

Note that each of ID areas ID-0 to ID-5 consists of 8 bits, and when using these to record a specific mode consisting of program positive, hours, minutes, and seconds, as shown in Table A below. Mode to ID-0, program positive to ID-1, I
Hours are recorded in D-2, minutes are recorded in ID-3, seconds are recorded in ID-4, and nothing is recorded in ID-5.

Table A An example of a record when the program positive is 5 and the hours, minutes, and seconds is 1 hour, 15 minutes, and 28 seconds is shown in Table B below.

Table B FIG. 6 shows the PCM rank in which tape position information that can be effectively used to locate the beginning of a program recorded on a tape is recorded by the method of the present invention, and the recording is performed using the above-mentioned I
This is done using area D.

In the figure, X is the section where the program with program positive m-1 is recorded, Y is the section where the program with program positive m is recorded, and Z is formed between programs m-1 and m. For example, this is a PCM blank section of about 3 seconds, and nothing is recorded as normal information in this section Z.

The first PCM trunk PT1 of the area Y of the program lkm has the lkm of the program recorded in the area Y.
km, and the hours, minutes, and seconds from the beginning of the tape T to the trunk PT1 are recorded. Thereafter, three PCM1-racks are skipped at a time, and the hours, minutes, and seconds from the start of the program f1mm and the program f1mm to that trunk are recorded. That is, in the case shown, PCM) rank P5.・
...P (411+1) (jl=Ot 1 #
2. The program Nam and the hours, minutes, and seconds to each trunk are recorded in ``Old'').In the case of 60 field recording method, 60 trunks are scanned per second, so 4xx
The hours, minutes, and seconds recorded in +1 (〉60〉) PCM l-ranks may be the same, but after that, the hours, minutes, and seconds added by 1 second for every 60 trunks are programmed. Recorded with llhm.

And PCM where program Nam is not recorded)
Rack P, 2. P-cho 3. p〒4. In PT6, etc., the hours, minutes, and seconds from the beginning of the tape for each floor from Na1 to fl&1 (m-1) and the first trunk of each program are repeatedly recorded one by one in order. . That is,
NllLNllL (the first PCM of each program up to
) The hours, minutes, and seconds recorded in the rank are recorded repeatedly.

Assuming that m = 5, recording as shown in Table C below is performed.

Table C The tape position information recorded on the tape as described above is
It can be read by placing the VTR in playback mode and moving the tape slightly.

The information that is read out is the current tape position (hours, minutes, seconds), the current position of the program, and the tape position (hours, minutes, seconds) of the beginning of the program before the program location.From this, the desired program name can be selected. By specifying this, the amount of tape to be transferred (hours, minutes, seconds) is immediately calculated from the tape position of the specified positive program and the current tape position,
Based on this, a command can be issued to the VTR body to automatically detect the beginning of the specified southern program.

When recording the above tape position information, it corresponds to the tape length from the tape start point that represents the tape position of the start end of all programs including the last program until the recording of the program on one tape is completed. It is necessary to have a memory to remember hours, minutes, and seconds. Therefore, when the recording of a program on one tape is completed, the tape is fed backwards to the beginning of each program based on the contents of the memory, and the above-mentioned PCM between programs is recorded.
It is possible to automatically dub all the contents of the memory into the blank section Z. The length of the J3 memory contents varies depending on the number of programs, but for example, 60
This program is based on a book and consists of 51 seconds (60 tracks) of dubbing.

In the case where one tape has been recorded as described above, even if the tape is loaded into the VTR at an arbitrary position, by transporting the tape in playback mode for a short time, it is possible to record the tape before that position. If the designated program is among them, the tape can be immediately transferred and the beginning of the program can be detected as described above. Even if a program after that position is specified, the position information of the beginning of all programs can be obtained by moving the tape between the program at the current position and the previous or next program, so the program can be specified immediately after that. You can move the tape to the beginning of the program and cue it.

The number of programs recorded on tape can be arbitrary;
If the memory capacity allows, even if there are 100 programs, for example, the position information of the beginnings of all programs can be recorded between programs by dubbing in less than 2 seconds. Therefore,
It is sufficient that the length of the blank section Z is about 2 seconds,
This length of blank section does not pose a problem when playing a videotape.

Details of the procedure for locating the beginning of a desired program using the tape position information recorded as described above will be explained with reference to the flowchart shown in FIG.

First, when a video tape with the above-mentioned positional information recorded is loaded onto the VTR, in step 31, the VTR winds the tape around the drum. Thereafter, in step S2, the VTR is run in the playback mode for about 3 seconds, and the record in the ID area of the PCM) rank 2 is read out.

Then, in step S3, it is determined whether there is any reading, and if there is, it is stored in the memory in step S4. Subsequently, in the next step S5, a standby signal is issued to temporarily stop the VTR.

Thereafter, it is determined in step S6 whether or not the operator has designated a program storm, and if YES, then in step S7 it is determined whether information regarding the designated program exists in the memory.9 The determination result is YES. If so, the tape transport amount and direction are calculated from the information in the memory in step S8. Then, depending on the calculation result, in step S9, the tape is transported to a predetermined position in the 10x picture search mode, or as shown by the dotted line, in step S9',
After the tape is run by FF or REW to the approximate position calculated by reel rotation detection, step 39
'', the tape is transported from the approximate position to a predetermined position in picture search or playback mode.

If the determination in step S3 is No and there is no information read from the ID area, the process proceeds to step SIO, where the tape is rewound by picture search to the point where the position information is located, and in subsequent step S311 the ID area is read out.
The area is read out, and then the process proceeds to step S4.

If the determination in step S7 is No, and there is no information regarding the specified program in the memory, the process proceeds to step SL2, where the tape is transferred to the nearest dubbing section based on the memory information, and the information there is transferred to the step SL2. In S13, it is read out and stored in the memory, and the determination in step S7 is performed again. This step 312
．． S13 is repeated until the information regarding the designated program is found. If found, the process advances to step s8.

Note that for tapes that have been completed as software programs, the positional information of the beginning of the last program from the first program is known, so this positional information is transferred to the PCM.
It is sufficient to repeatedly put it in the L-rack continuously.

Furthermore, by recording not only the beginning of each program but also the end thereof, it becomes possible to make dubbing even easier. Furthermore,
If the year, month, and day are appropriately recorded on the trunk indicating the current location, it will be even more convenient to use.

In the above embodiment, the position information recorded in the PCM trunk for each predetermined number of programs consists of the current program position and the hours, minutes, and seconds from the start point of the program. Hours, minutes, and seconds representing the length of the tape from the beginning of the tape to the trunk to which it is currently being recorded may be recorded.

Further, as the program position information, a trunk number corresponding to the number of PCM1-ranks from the beginning of the tape may be used instead of hours, minutes, and seconds. In this case, the number of digits is large (
, at least six digits, one track number must be recorded using at least three IDs, for example II)-1-ID-3.

Furthermore, in the above example, dubbing of program position information to the blank section between programs is performed for all programs, but dubbing to the blank section after a predetermined program is performed for the program after the predetermined program. It is also possible to perform only Moreover, this dubbing may be repeated until all trunks are filled with blank sections.

As explained above, according to the method of the present invention, position information regarding the current program and position information regarding previous programs are repeatedly recorded in the digital information recording trunk that is an extension of the video track on which the program is recorded. .

Therefore, tape position information necessary for locating the beginning of a program between programs can be easily obtained by a short playback of the tape, making it possible to perform a continuous search for locating the beginning of a large number of programs. There is no need to memorize or record large numbers of digits such as minutes and seconds, and the program 1
Just by memorizing or recording only 1kL (usually 2 digits), you can automatically (and easily) search the program.
Many effects can be obtained, such as making TR easier to use for users. In particular, if the position information of all programs is recorded on unrecorded PCM tracks between programs, program searches can be made even easier.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the trunk configuration of an 8 mm video tape in which tape position information is recorded by the method according to the present invention;
Figure 2 is an explanatory diagram showing the relationship between the tape and the rotating head;
4 and 4 are diagrams for explaining how to play the 8 mm videotape shown in FIG. 1, FIG. 5 is an explanatory diagram showing details of the PCM) rack, and FIG. 6 is an explanatory diagram showing tape position information according to the method of the present invention. FIG. 7 is an explanatory diagram for explaining the recording of FIG. 7, and FIG. 7 is a flowchart showing steps for locating a program using information recorded according to the present invention. Vv...Video track P,...PCM) rack patent applicant Pioneer Corporation

Claims (1)

[Scope of Claims] (In a videotape having a digital information recording track that can be used to record digital information provided on an extension of the video track recorded and played back by an 11-rotary head, a video recording program is recorded. A tape position information recording method characterized in that position information regarding the current program and position information regarding previous programs are repeatedly recorded on the digital information recording trunk on an extension of the track. (2) Recording and reproduction by a rotating head. In a videotape having a digital information recording track that can be used to record digital information, the digital information recording track is provided on an extension of a video trunk in which a program is recorded, A tape position information recording method that repeatedly records position information regarding the current program and position information regarding previous programs, in which position information regarding each program is temporarily stored in a storage means, and all programs are recorded. 2. A tape position information recording method, characterized in that after the program is completed, position information regarding the stored program is recorded in an unrecorded digital information recording trunk provided in advance between the programs.