JPH06131820A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a magnetic recording and reproducing device in which indexes consisting of plural items can be edited for each item and the detection probability of the codes for program searching is increased at the time of a high seed search. CONSTITUTION:Video signal which is divided into plural segments for each prescribed group, and index signal which is associated with the video signal are recorded onto the respective regions of tilted tracks on a magnetic tape 1 by a rotary head. An index generator 21 is provided with plural index item generators 13, 16 and 17, an index item outputting device 19 which selectively outputs plural index items for each track and a synthesizer 20 which synthesizes plural outputs of the device 19. The index regions are recorded with signals while divided into plural small regions within one track and a code for program searching is recorded at least every small region of the index regions of one track.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for recording information such as video (video), audio and data on a magnetic tape and reproducing the recorded information. The present invention relates to a magnetic recording / reproducing apparatus for recording. Here, the editing is a function of changing the recording content including rewriting of a predetermined recording area, erasing of a predetermined recording area, continuous additional recording after the predetermined recording area, and the like.

[0002]

2. Description of the Related Art A magnetic recording / reproducing apparatus using a magnetic tape as a medium such as a video tape recorder (hereinafter abbreviated as VTR) has been put into practical use and prevailing. In addition, further miniaturization of devices by higher density recording and development of digitization are being carried out. Usually, when recording an information signal, the index signal is also included in the recording. Here, the index signal is a cue code indicating the recording start position of the data, an absolute time code indicating the absolute position on the magnetic tape, a user time code determined by the user, a title indicating the content of information, and the like. Examples of recording such an index signal include DAT (Digital Audio Tape recorder), 8
mmVTR etc. are mentioned. It is well known that in the DAT or 8 mm VTR standard, it is possible to perform editing such that only the index is re-recorded while the recorded video signal or audio signal is stored.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the 8 mm VTR standard, information on a plurality of items (the above-mentioned cue code, absolute time code, user time code) is recorded in the index area of one track, and one of the items (for example, the head) is recorded. Editing such as re-recording only the issue code, absolute time code or user time code cannot be performed.

An object of the present invention is that even when an index associated with a video signal includes a plurality of items, the item can be edited for each item and a high-speed search index such as a cue code is highly necessary. For items, the present invention provides a magnetic recording / reproducing apparatus with improved detection capability.

[0005]

In order to solve the above-mentioned problems, a magnetic recording / reproducing apparatus of the present invention provides a video signal area and an index area on a diagonal track formed on a magnetic tape. A rotary head for recording separately, a magnetic tape running means for running the magnetic tape, a video signal generating means for generating the video signal, a clock generating means for generating a clock synchronized with the video signal, and Rotary head control means for controlling the operation of the rotary head based on the clock output of the clock generation means, and segmenting means for dividing the input video signal into a plurality of segments for each predetermined group to generate a segmented video signal. And index generating means for generating an index signal accompanying the video signal, The segmented video signal and the index signal are switched according to the clock output of the clock means, and the segmented video signal is recorded in the video signal area of the track and the recording signal for recording the index signal in the index area. Recording means for outputting to the rotary head; the index generating means, N index item generating means for generating N (here, N is an integer of 2 or more) kinds of index items respectively; Index item output means for outputting M (where M is a positive integer such that M <N) index items out of the index items;
The index signal of the N kinds of index items, including a synthesizing unit that synthesizes the index items and outputs the index signal as the index signal, and a cue code generating unit that generates a cue code for detecting the cue of the video signal. At least one of them is the cue code, and the index area for recording the index signal is divided into a plurality of small areas in one track and recorded, and at least 1
The index code is recorded in each small area of the index area of the track of the book.

[0006]

According to the present invention, the index area of one track is divided into a plurality of small areas and the cue code is recorded in each small area of each index area of all tracks. It is possible to improve the detection ability of.

[0007]

1 is a diagram showing a recording operation of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a magnetic tape, 2a and 2b are rotary heads attached to a cylinder (not shown), and 24_1 to 24_10 are tracks formed on the magnetic tape 1, respectively.
Reference numeral 7 denotes a tape running device, which is composed of a capstan motor 4, a pinch roller 5, and a capstan control circuit 6. 8 is a video signal generator, 9 is a clock generator,
Reference numeral 10 is a segmenting circuit, 11 is a frame synchronization signal generator, and 12 is a tracking signal generator. 21 is an index generator, which includes a cue code generator 13, a time code generator 16, a character code generator 17,
Segment number recognizer 18, index item output device 1
9 and a synthesizer 20. The time code generator 16 is composed of the absolute time code generator 14 and the user time code generator 15. Furthermore, 2
2 is a recorder, and 23 is a rotary head controller. This embodiment is an example in which two tracks are recorded and reproduced substantially simultaneously by the rotary heads 2a and 2b. FIG. 2 is a view showing the arrangement of the rotary heads on the cylinder in this embodiment, and 3 is the cylinder.

FIG. 2 is a diagram showing the structure of each track shown in FIG. 1. A positioning signal area 27 is provided in a part of the tracking signal area 28 formed at the head of the track and the positioning signal is recorded. A relatively high frequency is selected for this positioning signal, which is unlikely to be affected by the adjacent track.
Further, a tracking pilot signal is frequency-multiplexed and recorded in the tracking signal area 28. This pilot signal is alternately recorded at two different frequencies f1 and f2 every other track. The frequencies of these two types of pilot signals are selected to be relatively low frequencies that are less likely to be affected by the azimuth loss of the rotary heads 2a and 2b. A video signal is recorded in the video signal area 25, and an index signal is recorded in the index area 26.

Next, the recording operation in FIG. 1 will be described. At the time of recording, the magnetic tape 1 travels by a capstan motor 4 and a pinch roller 5 whose rotation speed is controlled by a capstan control circuit 6.

The video signal generator 8 produces a signal corresponding to 30 frames per second (one frame is one screen of a television). In the segmenting circuit 10, one frame of signal is
Divide into 0 segments. Finally, one frame of the video signal is divided into 10 tracks and recorded. The segmented video signal (segmented video signal) including the segment number is input to the recorder 22.

The clock generator 9 produces a clock synchronized with the input video signal. Here, 30 per second
The video signal of the frame is input, and a 150 Hz clock synchronized with the video signal is generated.

The tracking signal generator 12 has two different frequencies f depending on the clock of the clock generator 9.
A tracking signal including the pilot signals 1 and f2 and the positioning information signal is generated. This tracking signal is input to the recorder 22.

The frame synchronization signal generator 11 generates a 30 Hz frame synchronization signal which is synchronized with the frame of the input video signal.

The cue code generator 13 generates a cue code mainly for use in a high speed search. Specifically, it is a signal indicating the recording start position of the program. Since a high-speed search function is essential in a VTR or the like, it is very advantageous to record the cue code as one index item. The cue code is input to the index item output device 19.

The absolute time code generator 14 generates an absolute time code indicating an absolute position on the tape.
Specifically, it is a signal representing the recording time from the beginning of the tape or the number of tracks. When the user edits the video signal, the absolute time code is used to know the recording position, so that recording the absolute time code as one item of the index has a great advantage. The absolute time code is input to the index item output device 19.

The user time code generator 15 generates a user time code to be added to the recorded program and managed by the user. Specifically, it is a signal indicating the date and time when the program was recorded. By recording the user time code as one item of the index, it becomes possible to manage the video signal in the format of year / month / day / hour / minute / second when recording which is easier to use. The user time code is input to the index item output device 19.

The character code generator 17 generates a character code relating to the recorded program. Specifically, it is a signal representing the title of the program, the photographer or the like when recorded in a video camera or the like. The character code is input to the index item output device 19.

The segment number recognizer 18 uses the clock of the clock generator 9 and the frame synchronization signal of the frame synchronization signal generator 11 to identify the segment number within one frame of the segmented video signal input to the recorder 22. (1-10) is recognized, and the segment number is input to the index item output device 19.

The index item output device 19 operates in accordance with the segment number of the segment number recognizing device 18 to synthesizer 2
The signal input to 0 is switched. Specifically, when the segment numbers are 1, 2, and 3, the cue code and the absolute time code are used, when the segment numbers are 4, 5 and 6, the cue code and the user time code are used, and the segment number is 7,
In the case of 8, 9 and 10, the cue code and the character code are input to the synthesizer 20. However, in outputting the absolute time code and the user time code, the same time code is input to the synthesizer 20 regardless of the segment number. As for the cue code, the same code is input to the synthesizer 20 within one frame.

In the synthesizer 20, the index item output device 1
The two outputs of 9 are combined. The combined signal is input to the recorder 22 as an index signal. Here, the index signal in this embodiment includes the cue code at any segment number in one frame. Also, absolute time code, user time code,
The character code is included in the index signal at a plurality of consecutive segment numbers.

The recorder 22 outputs a recording signal to the rotary heads 2a and 2b so that the segmented video signal, the index signal, and the tracking signal are divided into areas and recorded according to the clock output of the clock generator 9.

The rotary head controller 23 controls the rotary heads 2a and 2 so as to synchronize with the clock output of the clock generator 9.
Controls the rotation speed of the cylinder 3 in which b is mounted.

As a result of the above operation, the tracks as shown in FIG. 3 are formed on the magnetic tape 1. Here, the index area 26 is divided into a plurality of (15 in FIG. 3) small areas called synchronization units. 26a-26o
Are synchronization units. In the track in which the absolute time code or the user time code is recorded, the same code is recorded in each synchronization unit of the index area in the one track. Further, FIG. 4 shows a detailed configuration of one synchronization unit 26a of the index area 26 in FIG. Here, 26a is a synchronization unit in which an absolute time code and a cue code are recorded. 26
a_1 is an area called sync, and 2 bytes of a signal indicating the recording start position of the synchronization unit are recorded. 26a_2
Is an absolute time code recording area and is recorded in 4 bytes. 26a_3 is a cue code recording area,
It is 1 byte. 26a_4 is an area called parity, and a signal for detecting (and further correcting) a signal reading error is recorded therein. This area is 2 bytes.

The structure is the same for each synchronization unit of the index area of the track on which the user time code is recorded. That is, the user time code is recorded instead of the absolute time code.

As described above, if the time code (absolute time code or user time code) and the cue code are additionally recorded as index signals in the video signal and are recorded at the same time, they can be effectively used during editing and searching. it can.

Further, as shown in the present embodiment, if the index area in one track is divided into a plurality of sync units and the index search code is recorded in each sync unit of the index areas of all tracks. For example, in the case where the scanning locus of the rotary head traverses a plurality of tracks as in a high-speed search, it is only necessary to be detected from at least one synchronization unit, so that the probability of detecting the cue code can be greatly increased.

Further, as shown in the present embodiment, in the track where the time code is recorded, if the same code is recorded in each synchronization unit of the index area in the one track, high speed is achieved. In the case where the scanning locus of the rotary head crosses a plurality of tracks as in the case of searching, it is sufficient to be able to detect from at least one of the sync units in which the same time code is recorded. The probability can be greatly increased.

As shown in this embodiment, not all index items are recorded in the index area of one track, but a specific index item selected is recorded in one track, that is, different tracks are recorded according to the combination of index items. If it is recorded in, it is possible to individually edit each index item. Details of the editing method will be described later.

In particular, as shown in the present embodiment, if the index signals of the same item are recorded in the index areas of three or more continuous tracks, it is extremely difficult for track thinning due to editing of adjacent tracks. Become stronger. For example, in terms of absolute timecode,
It is possible to significantly reduce the adverse effects of track thinning that occurs when the user time code or character code is rewritten. FIG. 5 is a diagram showing a state in which the index areas of both adjacent tracks of a certain track are rewritten. For example, if the absolute time code is recorded on only one track, and both adjacent tracks are subjected to insert editing, the track on which the absolute time code is recorded becomes thin on both sides of the track, and the rotary head When reading a signal, there is a high probability that a reading error will occur, and the reliability of the data will drop significantly.
FIG. 6 is a state of track thinning when the index areas of both adjacent tracks are rewritten when an index consisting of the same combination of index items is recorded on three consecutive tracks as in this embodiment. Is shown. Since both sides of the track are not thinned and at least one track is stored as it is, the index signal can be reproduced and detected without error. In this way, three consecutive 3
Recording an index signal composed of the same combination of index items on more than one track is extremely effective in terms of reliability of the index signal after insert editing.

Further, the same time code (absolute time code or user time code) is recorded in the index areas of a plurality of consecutive tracks in one frame,
If the index area for recording the time code has a track structure in which the cue code is recorded, it is possible to edit the cue code while rewriting the time code. It is very convenient if the cue code can be inserted at an arbitrary position after recording the video signal. For example, if it can be inserted after recording at a place where the shooting place has changed while shooting with a video camera or the like, it is very effective in searching for a desired scene. In this case, the time code needs to be saved. That is, it is an effective function to be able to edit only the cue code while saving the time code.

Next, the editing operation will be described with reference to FIG. In FIG. 7, 29 is an edit point changeover switch, 30 is a tracking error detector, 31 is a positioning information signal detector, 32 is an edit timing generator, 33 is an edit area indicator, 34 is a segment number detector, and 35 is a head. Output code detector, 36 is an absolute time code detector,
37 is a user time code detector. here,
Assuming that the cue code is recorded in the index area where the absolute time code and user time code are recorded, the cue code is equivalent to 5 seconds (150 frames)
The case of rewriting will be described.

When rewriting the cue code on the recorded magnetic tape, the mode in which the magnetic tape is run in the reproducing state is changed to a mode in which the cue code is rewritten at a certain timing. First, the operation common to the two modes will be described. The clock generator 9 produces a signal of 150 Hz, and the rotary head controller 23 controls the rotation speed of the cylinder 3 in which the rotary heads 2a and 2b are mounted so as to synchronize with the clock output of the clock generator 9. Also, as described below,
When the rotary heads 2a and 2b scan the tracking signal area 28 of the track, the edit point changeover switch 29 is used.
Is connected to the terminal 29b, and a reproduction signal is output from the rotary head 2a to be in a reproduction state. Tracking control is performed by this output signal.

Now, the tracking method will be described. In the tracking signal area 28 of the track recorded by the above-mentioned method, pilot signals of two different frequencies f1 and f2 are frequency-multiplexed and recorded every other track. Here, it is assumed that f0 track, f1 track, f0 track, f2 track, f0 track, f1 track, ... Are recorded in order from the track 24_1. Here, no pilot signal is recorded on the f0 track. Frequency f1 for f1 track
Of the pilot signals are frequency-multiplexed and recorded.
The pilot signal of frequency f2 is frequency-multiplexed and recorded on the f2 track. The tracking is controlled so that the rotary head 2a always scans the f0 track. For example, in FIG. 7, tracking is performed so as to scan the track 24_11. Now, the rotary head 2a moves to the tracking signal area 2 of the track 24_11.
8 scans both adjacent tracks 24_10,
The leak components of different pilot signal components f1 and f2 recorded in 24_12 are included and detected. Tracking error information is detected by the tracking error detector 30 from this signal, and the capstan control circuit 6 controls the capstan motor based on the input tracking error information. Here, the tracking error detector 3
For 0, a known detector that compares the magnitudes of the f1 component and the f2 component and outputs tracking error information proportional to the difference is used. Here, the tracking error information always outputs the difference between the pilot component included in the preceding track and the pilot component included in the rear track. For example, when the rotary head 2a is scanning the track 24_11, the track 2
A value proportional to the difference between the pilot components included in the tracking signal region of track 4_10 is output from the pilot components included in the tracking signal region of 4_12. Since the rotary head 2b is arranged very close to the rotary head 2a and the relative positional relationship between the rotary head 2a and the rotary head 2a can be accurately ensured, the rotary head 2a and the track 24_12 are tracked by the rotary head 2b and the track 24_12. Tracking can also be achieved at the same time.

Now, during the reproduction state before the rewriting of the cue code is started, the creation of the recording signal is newly started. Next, the operation will be described. Tracking is performed by the method described above, and the reproduction signal from the rotary head 2a is input to the absolute time code detector 36 and the user time code detector 37. Absolute time code generator 14
Then, the absolute time code detected by the absolute time code detector 36 is incremented by one frame to generate an absolute time code.
If it is no longer input from, the code that is the same as the previously recorded absolute time code is created by incrementing one after another. Regarding the user time code, the user time code detector 37 and the user time code generator 15 similarly generate the same code as the previously recorded user time code.

From this point on, the editing area indicator 3
It is assumed that the cue code is rewritten by the instruction signal from 3. In this case, the edit point switching switch 29 switches between a mode for recording the recording signal created by the recorder 22 and a mode for reproducing the signal from the rotary heads 2a and 2b at a timing determined by a method described later. That is, when scanning the index area of the track on which the cue code is recorded, the mode for recording the recording signal is used, and for scanning the other area, the mode for reproducing the signals from the rotary heads 2a and 2b is used. Become.

First, the cue code generator 13 creates a new cue code in response to an instruction signal from the editing area indicator 33. The created cue code is input to the index item output device 19.

The index item output device 19 switches the signal input to the synthesizer 20 according to the segment number detected by the segment number detector 34. here,
The segment number detector 34 demodulates the reproduced signals from the rotary heads 2a and 2b to obtain the video signal area 25.
The segment number (track number within one frame) included in the video signal of is detected. For example, in FIG. 7, the segment number of the track 24_11 is 1. Also, the segment number detected is the segment number one scan before, and since 2ch simultaneous recording is performed,
If the detected segment number is 9, 10, or 1, the absolute time code is used, and if the detected segment number is 2,
In the case of 3 and 4, the index item output device 19 outputs the user time code. Further, since the cue code is recorded in the index area of the track where the absolute time code and the user time code are recorded, it is output when the segment numbers are 9, 10, 1, 2, 3, 4.

Then, as in the case of recording shown in FIG. 1, the cue code and the time code are combined by the combiner 20 and input to the recorder 22 as an index signal. The recorder 22 responds to the clock output of the clock generator 9 that is the control reference for the rotary heads 2a and 2b.
A recording signal for recording the index signal in the index area is output to the edit point changeover switch 29.
A recording current is created by such an operation.

The subsequent operation will be described with reference to FIGS. 8 and 9. The edit area indicator 33 outputs a signal instructing to rewrite the cue code. That is, a signal instructing to rewrite the index area when the segment numbers are 1, 2, 3, 4, 5, 6 is input to the edit timing generator 32. The instruction signal is output for 5 seconds (equivalent to 150 frames).

The edit point changeover switch 29 is the terminal 29b.
While being connected to, the signal from the rotary head 2a is separately input to the positioning information signal detector 31. Then, the positioning information signal detector 31 detects the positioning information signal recorded in the positioning information signal area 27, which is a part of the tracking signal area on the track, and determines the position of the positioning signal as shown in FIG. 9B. Generate a pulse signal to represent. This pulse signal is input to the edit timing generator 32.

The segment number detector 34 detects the segment number (track number within one frame) included in the video signal in the video signal area 25 by demodulating the reproduced signal. The detected segment number is input to the edit timing generator 32.

To rewrite the index area of a specific track in one frame, it is necessary to specify the track (segment) number to be rewritten and the start position and end position on the track. The edit timing generator 32
Based on the output signal of the editing area indicator 33, the output pulse signal of the positioning information signal detector 31, and the output segment number of the segment number detector 34, a timing signal for switching the connection of the edit point changeover switch 29 between the terminals 29a and 29b is provided. create. Next, the operation of the edit timing generator 32 will be described in detail.

The output signal of the edit area indicator 33 and the output signal of the segment number detector 34 are input to the comparison calculator 32a of the edit timing generator 32. Then, the comparison calculator 32a detects the track number to be tracked in the next head scan from the output of the segment number detector 34. If the track number matches the track number input from the editing area indicator 33, the comparison calculator 32a sets the output Trs to Trs = ”.
If it does not match H ", Trs =" L "is set. Here, since the segment number detector 34 detects the segment number included in the video signal recorded in the video signal area 25, the rotation is performed. The segment number held when the head 2a scans the index area 26 or the tracking signal area 28 is 1
It is the segment number of the previous scan.

The output pulse signal of the positioning information signal detector 31 is input to the first delay circuit 32b and the second delay circuit 32c. Each delay circuit starts counting the internal clock of the present magnetic recording / reproducing apparatus shown in FIG. 9A, and counts the internal clock corresponding to the specified delay times t1 and t2 to generate the delay signal of each delay circuit. .
Then, those signals are converted into RS-FF (Flip Fl).
op) 32d to input as shown in FIG.
An index edit timing signal as shown in (c) is generated. This index edit timing signal is output to the AND circuit 32e together with the output Trs of the comparison calculator 32a.
Is input to the edit point changeover switch 29 as a cue code edit timing signal.

Only when the cue code edit timing signal created as described above is "H", the edit point changeover switch 29 is changed over from the terminal 29b to the terminal 29a, and a new recording signal is added to the rotary head 2a. The index area of the track in which the cue code is recorded is rewritten with a new cue code.

A recording current is created by the method described above,
By determining the timing of rewriting, in the embodiment of the present invention, insert editing for rewriting the cue code can be performed while saving the time code (absolute time code and user time code).

Also, consider a case where only the time code is rewritten while the cue code is stored. For example, when you want to record an accurate code when you have recorded without adding a time code, or when the date and time when it was recorded are incorrect (due to time difference or internal clock not adjusted). Can be assumed. Here, consider the case of rewriting the user time code while saving the cue code. In this case, the difference from the case of rewriting the cue code is that if the desired time code is created by the user time code generator 15, the method of creating the cue code and the editing area instruction when creating the recording current are specified. This is the rewriting track number designated by the output signal of the device 33. Here, the rewriting track number is different from the case of rewriting the cue code, but since the operation principle is the same, detailed description will be omitted. The output signal of the editing area indicator 33 has a track number (segment number) of 4,
In the cases of 5 and 6, only a signal instructing to rewrite the index area is input to the edit timing generator 32.

Next, a method of creating a cue code when rewriting the user time code will be described. When the edit point changeover switch 29 is connected to the terminal 29b and the reproduction signal from the rotary head 2a is input, the cue code detector 35 uses the reproduction signal from the index area of the track in which the absolute time code is recorded. Detect the cue code. The cue code generator 13 creates the same code as the detected cue code. By inputting the created cue code into the synthesizer 20,
After that, the recording current can be created as in the case described above.

When rewriting the absolute time code, the cue code is detected from the index area of the track in which the user time code is recorded. In this case, the cue code detected by the cue code detector 35 is detected. The code is the information of one frame before, but there is no problem functionally from the viewpoint of the nature of the cue code.

As described above, if the cue code is recorded in the index area of the track for recording the time code, the time code or the cue code can be individually edited. Moreover, since the number of tracks to be recorded for the cue code can be increased, the detection capability at the time of high speed search can be improved. Therefore, it is possible to realize a magnetic recording / reproducing apparatus having a more advanced editing function.

In the present embodiment, an example of simultaneous recording of 2 channels is shown, but the combination and arrangement of the rotary heads are not limited to this embodiment and can be similarly applied in other cases.

In this embodiment, the case where a video signal of 30 frames per second is created has been described, but the number of frames is not limited. Further, although the case where a video signal of one frame is divided into 10 segments and recorded on 10 tracks is shown, the number of divided segments is not limited.

Further, in the present embodiment, the case of the apparatus for recording the video signal is shown, but it goes without saying that the present invention also includes the case of recording the audio signal as well.

In the present embodiment, the case where there are two types of tracking pilot signals is shown, but 8 mmVT
It is also possible to use pilot signals of four types of frequencies used in R, and it is also possible to change the recording location of the pilot signal such as DAT and record.
The way of inserting the pilot signal is not limited.

In this embodiment, the case where the tracking control is performed by using the pilot signal frequency-multiplexed in the tracking signal area at the head of the track is shown, but only the positioning information signal at the time of editing is recorded in the tracking signal area. For tracking control, V of the conventional VHS method is used.
The control using the control signal recorded in the linear track at the end of the tape as in TR may be performed.

[0056]

As is apparent from the above description, according to the magnetic recording / reproducing apparatus of the present invention, the index of the video signal can be individually edited for each item, and the index code and the time code can be edited. As described above, it is possible to improve the detection probability for an item for which high-speed search is highly required. Therefore, if the magnetic recording / reproducing apparatus of the present invention is used, a V having a very advanced editing function and high-speed search function is provided.
A magnetic recording / reproducing method such as TR can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing a recording operation of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a layout view of a rotary head on a cylinder in an embodiment of the present invention.

FIG. 3 is a configuration diagram of recording tracks in an embodiment of the present invention.

FIG. 4 is a detailed configuration diagram of one synchronization unit of an index area in one embodiment of the present invention.

[Fig. 5] An example of a track thinning condition that occurs during insert editing

FIG. 6 is an example of a state of track thinning occurring during insert editing in an embodiment of the present invention.

FIG. 7 is a diagram showing an operation during insert editing of the magnetic recording / reproducing apparatus according to the embodiment of the present invention.

FIG. 8 is a configuration diagram of edit timing generation means in an embodiment of the present invention.

FIG. 9 is a time chart of each signal during insert editing in an embodiment of the present invention.

[Explanation of symbols]

 1 Magnetic Tape 2a, 2b Rotating Head 3 Cylinder 4 Capstan Motor 5 Pinch Roller 6 Capstan Control Circuit 7 Tape Running Device 8 Video Signal Generator 9 Clock Generator 10 Segmenting Circuit 11 Frame Sync Signal Generator 12 Tracking Signal Generator 13 Cue code generator 14 Absolute time code generator 15 User time code generator 16 Time code generator 17 Character code generator 18 Segment number recognizer 19 Index item output device 20 Synthesizer 21 Index generator 22 Recorder 23 Rotation Head controller 24_1 to 24_10 Track 25 Video signal area 26 Index area 27 Positioning information signal area 28 Tracking signal area

Claims (7)

[Claims] 1. A rotary head for recording a video signal and an index signal separately on a diagonal track formed on a magnetic tape in a video signal area and an index area, and a magnetic tape running means for running the magnetic tape. And video signal generating means for generating the video signal,
Clock generating means for generating a clock synchronized with the video signal, rotary head control means for controlling the operation of the rotary head based on the clock output of the clock generating means, and a plurality of groups for each predetermined group of the input video signal. Segmenting means for dividing into segments to generate a segmented video signal, index generating means for generating an index signal accompanying the video signal, the segmented video signal and the segmented video signal according to a clock output of the clock generating means. Switch the index signal,
Recording means for outputting the segmented video signal in the video signal area of the track and a recording signal for recording the index signal in the index area to the rotary head, wherein the index generating means is N (here , N is an integer of 2 or more)
Index item generating means and M of the N index items (where M is a positive integer such that M <N)
Index item output means for outputting the index items, composite means for combining the M index items and outputting as the index signal, and a head for generating a cue code for detecting a cue of the video signal. At least one of the N kinds of index items is the cue code, and the index area for recording the index signal is divided into a plurality of small areas and recorded in one track. The magnetic recording / reproducing apparatus is characterized in that the indexing code is recorded in each small area of the index area of at least one track. 2. A rotary head for recording a video signal and an index signal separately on a diagonal track formed on a magnetic tape in a video signal area and an index area, and a magnetic tape running means for running the magnetic tape. And video signal generating means for generating the video signal,
Clock generating means for generating a clock synchronized with the video signal, rotary head control means for controlling the operation of the rotary head based on the clock output of the clock generating means, and a plurality of groups for each predetermined group of the input video signal. Segmenting means for dividing into segments to generate a segmented video signal, index generating means for generating an index signal accompanying the video signal, the segmented video signal and the segmented video signal according to a clock output of the clock generating means. Switch the index signal,
Recording means for outputting the segmented video signal in the video signal area of the track and a recording signal for recording the index signal in the index area to the rotary head, wherein the index generating means is N (here , N is an integer of 2 or more)
Index item generating means and M of the N index items (where M is a positive integer such that M <N)
A plurality of index areas for recording the index signal, the index area outputting means for outputting the index items and a combining means for combining the M index items and outputting as the index signal. The magnetic recording / reproducing apparatus is characterized in that the index signals recorded in each of the small areas of at least one track are the same and are recorded separately. 3. A rotary head for recording a video signal and an index signal separately on a diagonal track formed on a magnetic tape in a video signal area and an index area, and a magnetic tape running means for running the magnetic tape. And video signal generating means for generating the video signal,
Clock generating means for generating a clock synchronized with the video signal, rotary head control means for controlling the operation of the rotary head based on the clock output of the clock generating means, and a plurality of groups for each predetermined group of the input video signal. Segmenting means for dividing into segments to generate a segmented video signal, index generating means for generating an index signal accompanying the video signal, the segmented video signal and the segmented video signal according to a clock output of the clock generating means. Switch the index signal,
Recording means for outputting the segmented video signal in the video signal area of the track and a recording signal for recording the index signal in the index area to the rotary head, wherein the index generating means is N (here , N is an integer of 2 or more)
Index item generating means and M of the N index items (where M is a positive integer such that M <N)
Index item output means for outputting the index items, synthesizing means for synthesizing the M index items and outputting as the index signal, time code generating means for generating a time code of the video signal,
A cue code generating means for generating a cue code for detecting cueing of the video signal;
The kind of index item includes the time code and the cue code, and the index item output means records the cue code at least in the index area for recording the time code. And a magnetic recording / reproducing apparatus. 4. A rotary head for recording a video signal and an index signal separately on a diagonal track formed on a magnetic tape in a video signal area and an index area, and a magnetic tape running means for running the magnetic tape. And video signal generating means for generating the video signal,
Clock generating means for generating a clock synchronized with the video signal, rotary head control means for controlling the operation of the rotary head based on the clock output of the clock generating means, and a plurality of groups for each predetermined group of the input video signal. Segmenting means for dividing into segments to generate a segmented video signal, index generating means for generating an index signal accompanying the video signal, the segmented video signal and the segmented video signal according to a clock output of the clock generating means. Switch the index signal,
Recording means for outputting the segmented video signal in the video signal area of the track and a recording signal for recording the index signal in the index area to the rotary head, wherein the index generating means is N (here , N is an integer of 2 or more)
Number of index item generating means and M of the N index items selectively for each track (here M
Is composed of index item output means for outputting M <N positive integer) index items, and combining means for combining the M index items and outputting as the index signal. And a magnetic recording and reproducing device. 5. The index item output means selectively outputs M index items out of N index items for each of a plurality of continuous tracks. The magnetic recording / reproducing apparatus according to any one of claims. 6. At least one of the N kinds of index items is a time code of a video signal, the index generating means includes a time code generating means, and the time code generating means is an absolute value indicating an absolute position on the tape. 5. The magnetic recording / reproducing apparatus according to claim 1, further comprising an absolute time code generating means for generating a time code. 7. At least one of the N kinds of index items is a time code of a video signal, the index generation means includes a time code generation means, and the time code generation means time-controls the video signal for each user. 5. The magnetic recording / reproducing apparatus according to claim 1, further comprising a user time code generating means for generating a user time code that can be performed.