JPS60214494A - Recording method of tape position information - Google Patents

Abstract

PURPOSE:To enable continuous searches for heading plural programs by recording repetitively position information of programs in recording and recorded programs on a digital information recording track of a magnetic tape. CONSTITUTION:Numbers NOm of programs recorded in an area Y and the time expressed in units of hours, minutes and seconds froma start point of a tape T to a track PT1 are recorded in the 1st PCM latch PT1 of the area Y of the programs NOm. Thereafter, the time expressed in units of hours, minutes and seconds from the program NOm to each track are recorded in the track PT5... by jumping every three tracks. Hours, minutes and seconds up to the 1st tracks of respective programs NO1-NO(m-1) from the start point of each tape are recorded sequentially and repetitively by one by in other PCM track PT2.... Pilot signals f1, f2, f3, f4, f1... are recorded in correspondence to tracks PT1, PT2, PT3, PT4, PT5.... The tape position information can be read when a VTR is set to a reproduction mode and a tape is slightly moved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a tape position information recording method for recording tape position information on a videotape.

[Technical background of the invention and its problems] When the number of programs recorded on video tape by a video tape recorder (VTR) increases, a desired program is searched out from among the recorded programs and played back from the beginning. Things become very difficult.

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

One of them is to use the program interval between the recording end of a program and the recording start of the next program as an unrecorded blank section, and detect the presence or absence of this blank section to locate the beginning of the desired program. be. 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 outside, which is a complicated operation and easy to make mistakes.In addition, it is difficult to automatically search among many programs and locate the beginning of many programs in succession. It also had the disadvantage of being.

The other method is to record a cue signal for starting the program on a cue track provided along one side 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. In this method, the signal processing is substantially the same as the first method in which cueing is performed only by cue signals, and the method in which the hours, minutes, and seconds are read is substantially the same as in the third method below. Similarly, 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 create V I T C (VerticalIn) corresponding to each video trunk on the videotape.
teval 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.

[Purpose of the invention]

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 a method for recording information.

[Structure of the invention]

The method according to the present invention has been made to achieve the object,
The video trunk of a magnetic tape has a video trunk for recording and reproducing by a rotating magnetic head, and a digital information recording trunk provided on an extension of the video trunk and used for recording and reproducing digital information by the rotary magnetic head. Four trunking pilot signals each having a different frequency are sequentially and repeatedly recorded, and the digital ti? 13 Record location information regarding the program currently being recorded in the recording trunk, and record the pyro-node signal of another frequency on the digital information recording trunk that is an extension of the remaining video trunk that has already been recorded. It repeatedly records location information regarding the program.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the track configuration of a videotape on which tape position information is recorded by the method of the present invention. A standard was recently announced for 8mm video, which has the potential to improve image quality than current VTRs. The tape T is provided with cue trunks Cu and audio trunks Il and u on both side edges along its longitudinal direction, and fixed heads are respectively associated with these trunks.

In the central part of the tape T there are two rotary heads HRI, as shown in FIG.
PCMl- scanned by a rotation of approximately 30° of a rotation of
A large number of ranks P and T are tilted at a predetermined trunk angle. A video signal for one field (two frames) is recorded in one video trunk VT.

The rotary heads HRI and HR2 are vertically shifted 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.
Rotary head HRI, H applied via r g A2
The video signal and PCM signal in the output of R2 (Fig. 3) are output to the output terminal TOI.

Each signal is separated and output to TO2. That is, the switching means SWI and SW2 are respectively switched to the state shown by the solid line in FIG. The video signal on the video trunk Pv is continuously output from the output terminal Tol, and the PCM on the rack PT
A signal is output from output terminal TO2.

The above explanation deals with the case of reproducing recordings on a videotape, but when recording a video signal and a PCM signal on a videotape, the application of the recording signal to the rotating head HRI is alternately switched. What is necessary is to perform the opposite of the above-mentioned reproduction.

The PCM trunk P, as shown in FIG. 5, 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 information, (2) date and time of recording, and (3) program floor, and the address selected from these is the ID.
It is supposed to be recorded in the area.

Each of ID areas ID-0 to ID-5 consists of 8 pinpoints, and when using these to record a specific mode consisting of program floor, hours, minutes, and seconds, as shown in Table A below. Mode to ID-0, program 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 recording when the program time is 5 and the hours, minutes, and seconds is 1 hour, 15 minutes, and 28 seconds is shown in Table B below.

Table B In general, VTRs use a signal to prevent so-called tracking deviation, a phenomenon that occurs when the magnetic head does not correctly scan the recorded trunk due to elongation of the magnetic tape and dimensional errors between individual VTRs during playback. It is recorded on magnetic tape along with the video signal.

The above biloft signal consists of four signals f with different frequencies.
+, f2 pf3, f<, and the relationship between these frequencies is fn f2=f3 fn ≠ f3 f2=B f
Set to <. And each of these pilot signals f+
= f4 is recorded for each trunk on the magnetic tape, and during playback, the frequency difference between the biloft signal played back via the rotating head and the pilot signal from the adjacent track that is played back at the same time due to tracking deviation is compared. ,
The obtained comparison signal, for example, a regenerated pilot signal and a biloft signal from an adjacent trunk that is simultaneously regenerated due to tracking deviation, is separated by a band-pass filter.
By focusing on one of the sideband components of the pilot signal obtained by balanced modulation, the direction of tracking deviation can be determined, and since the amplitude information is also extracted and multiplied, the amount of tracking deviation can also be detected. That is, r+ f2 = f3 f", ≠ f3 - f2 = f
4f+, and the frequency difference differs depending on the direction of track deviation of the reproducing head.

Therefore, by detecting the direction of deviation between the playback head and the track on the magnetic tape using the comparison signal and also extracting amplitude information, a signal for tracking the playback head can be obtained. .

The above is also done with 8mm+ VTRs, in which a relatively low-frequency pilot signal is sent to the video track when recording the video signal while running the rotating head along the video trunk on the tape during playback. When recording and playing back, the pilot signal frequency f of the own trunk is used.
2 and the pilot frequencies from the left and right adjacent tracks B
, f3, the rotary head traces the recording track by controlling the tape speed so that fl-f2 and f2-fJ are at the same level.

The biloft signals are fl, fh, r3, and r, respectively.

According to the standard, f 1 = 102544 H
z.

f t = 118951 HzSf 3 = 1652
10Hz.

f4 = 148689Hz (NTSC (in case of D)) and each track has fl , r, , f3 yf4 , fl
Repeat recording of 4 frequencies in this order.

FIG. 6 shows a PCM rack in which tape position information, which 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/O method.
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 the program m -1 and m
This is a PCM blank section of about 3 seconds, for example, formed between Z and Z, and nothing is recorded as general information in this section Z.

The first PCM trunk PT1 of the area Y of the program ttm contains k of the program recorded in the area Y.
m, and the time from the beginning of tape T to the trunk PT1.
Minutes and seconds are recorded. Thereafter, three PCM trunks are skipped at a time, and the hours, minutes, and seconds from the start of program No. m and program Nam to that trunk are recorded.

That is, in the case shown in the figure, P CM l-rank P 5.・
...P-d (4J+1) (j!=0,1,2・
...) to the program positive m and the time to each trunk.
Minutes and seconds are recorded. In the case of 60 field recording method,
60 trunks are scanned per second, so 4X6+
When recorded in one (>60) pCM rack
The minutes and seconds may be the same, but after that, the hours, minutes, and seconds are added by 1 second for every 60 tracks and are recorded together with the program 11111m.

and a PCM trunk P in which no program km is recorded; 2. P engineering 3. P, 4. P, 6, etc., each fault from floor 1 to No. (m-1) and the hours, minutes, and seconds from the beginning of the tape up to the first trunk of each program are listed in order. It is recorded repeatedly. That is, m(m
-1) The hours, minutes, and seconds recorded on the first PCM rack of each program up to (1) are repeatedly recorded.

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

Table C By the way, if the pilot signal f1 is recorded in the video track VT in which position information regarding the current program is recorded in the PCMl-rack P, as shown in FIG. 6, the PCM trunk PTl, PT2
, PT3, PT4, PT5..., pilot signals f+, f2, f3, f4gr1.
... will be recorded. Here, if we take a correspondence with Table C, the track in which the program l1kL5 is recorded has a PT of 116°, . . . , which all match the trunk in which the pilot signal f1 is recorded.

In this way, information regarding the current position (Ex program NFL2 and hours, minutes, and seconds from the beginning of the tape) is recorded only on the PCM trunk corresponding to the trunk where the pilot signal fl is recorded, and the information is recorded as f2 and f3.

If index information (for example, program floor m and the hours, minutes, and seconds from the beginning of the tape to the start point of this program) is recorded in f4, the r
Necessary information can be easily read not only by reading D-0 (mode) but also from the relationship with the pilot frequency.

In the case above, if you want to retrieve information about the current position, you only need to retrieve information about the trunk with the pilot signal f, and if you want to know the location of programs other than the current program, you can retrieve the information about the pilot frequencies of f2, f3, and f. Just read the ID.

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 read out is the current tape position (hours, minutes, seconds), its program floor, and the tape position (hours, minutes, seconds) of the beginning of the program before the program floor. From this, the floor of the desired program can be determined. By specifying this, the amount of tape to be transferred (hours, minutes, seconds) is immediately calculated from the tape position of the program on the specified floor and the current tape position.
Based on this, a command can be issued to the VTR main body to automatically detect the beginning of the program on the specified floor.

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 the 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 PC between the programs is
All the contents of the memory can be automatically dubbed into the M blank section Z. Although the length of the memory contents varies depending on the number of programs, for example, even if there are 60 programs, dubbing for one second (60 tracks) is sufficient.

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, the position information of all the programs can be recorded between the 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 outputting 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 videotape on which the above-mentioned positional information is recorded is mounted on a VTR, the VTR winds the tape around a drum in step s1. 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 PT 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 scan high signal is issued to temporarily stop the VTR.

Thereafter, it is determined in step S6 whether there is a program specification by the operator, and if YES, it is then determined in step S7 whether information regarding the specified program exists in the memory. If the determination result is YES, 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 39',
After the tape is run to a strategic position by FF or REW according to the calculation based on reel rotation detection, step 89
'', 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 advances to step SIO, where the tape is rewound by picture search to the point where the position information is located, and in the following step Sll, 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 advances to step S12, where the tape is transferred to the nearest dubbing section based on the memory information, and the information there is transferred to the step S12. In S13, it is read out and stored in the memory, and the determination in step S7 is performed again. This step S12
．． Si2 is repeated until 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.
) can be repeatedly entered in the rank 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 track indicating the current position, 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 floor 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 track to be recorded may also be recorded.

Further, as the program position information, a trunk number corresponding to the number of PCM) ranks from the beginning of the tape may be used instead of hours, minutes, and seconds. In this case, there are many digits,
Since there are at least six digits, one trunk number must be recorded using at least three IDs, for example ID-1 to 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.

By the way, in the above embodiment, the PCM (PCM) is an extension of a specific video trunk in which a pilot signal of a specific frequency is recorded.
The rank records only the location information regarding the program currently being recorded, but it also includes the year and year in which the program was recorded in the PCM rack corresponding to one specific video trunk.
Month, day, and one other PC that supports a specific video trunk
It may be possible to repeatedly record the real-time hours, minutes, and seconds in the M trunk, and the hours, minutes, and seconds from the beginning of the tape of the program currently being recorded in the PCM rank corresponding to the third specific video track. . As a result, the recording year, month, and day of the program can be determined by recording the PCM trunk corresponding to the first specific video trunk, and the beginning of the program by recording the PCM rank corresponding to the second specific video trunk. You can find out how much time has passed since.

Furthermore, in the above embodiment, the position information regarding the current program is recorded using the PCMl-rank on the extension of the video trunk in which the pilot signal of one specific frequency is recorded. Information regarding the current program may be recorded in the PCM trunk corresponding to the pilot signal, and information regarding the program before that program may be repeatedly recorded one by one in the PCM track corresponding to the remaining pilot signal.

In this case, for example, fl is information about the previous program, f2 is the recording year, month, and day of the current program, and f3 is
You can record the day of the week or real-time hours, minutes, and seconds, and the hours, minutes, and seconds from the beginning of the tape.

〔Effect of the invention〕

As explained above, according to the method of the present invention, a video trunk is recorded and reproduced by a rotating magnetic head, and digital information is provided on an extension of the video trunk and used for recording and reproducing digital information by the rotating magnetic head. Four tracking pilot signals of mutually different frequencies are sequentially and repeatedly recorded on each of the video trunks of a video magnetic tape having a recording trunk, and on an extension of the video track on which the pilot signals of a specific frequency are recorded. Record the position information regarding the program currently being recorded in the digital information recording I rack of Repeatedly record location information regarding already recorded programs.

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

In addition, as mentioned above, by associating the recording of specific tape position information with the pilot frequency, ID-
Even when a 0 mode signal is missed, it can be easily determined whether the information is necessary or not by identifying the pyroso i-signal frequency.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the track configuration of an 8 mm videotape on 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 8mm videotape shown in FIG. 1, FIG. 5 is an explanatory diagram showing details of the PCM track, and FIG. 6 is a diagram showing tape position information according to the method of the present invention. An explanatory diagram for explaining recording and FIG. 7 are a flowchart showing steps for locating a program using information recorded according to the present invention. VT...Video Trunk P,...PC, M) Rank Patent Applicant Pioneer Corporation Figure 5

Claims (1)

[Scope of Claims] A magnetic tape having a video trunk for recording and reproducing by a rotating magnetic head, and a digital information recording trunk provided on an extension of the video trunk and used for recording and reproducing digital information by the rotary magnetic head. four tracking biloft signals of mutually different frequencies are sequentially and repeatedly recorded on each of the video tracks of the video track, and the pilot signal of a specific frequency is currently being recorded on the digital information recording track on an extension of the recorded video trunk. Record position 1n information regarding the program. and a tape position information recording method characterized in that position information regarding a previously recorded program is repeatedly recorded on the digital information recording track that is an extension of the video track on which the pyro 71 signal of another frequency is recorded. .