JPH07130143A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide the magnetic recording and reproducing device which does not generate a frame deviation in an edited region and unedited region at the time of executing insert edition to rewrite a part of tracks. CONSTITUTION:A magnetic tape 8 on which frame identification signals for discriminating frames are multiple recorded together with pilot signals for tracking in the ITI (insert information) region of the recording tracks is subjected to tracking control in accordance with the pilot signals of the adjacent tracks 20c, 20e of the main scanning tracks 20d while the magnetic head 1 scans the ITI region at the time of the insert edition. Further, this recording and reproducing device includes a frame identification signal comparing means 30 which compares the reference frame identification signal accompanied with an edition information signal and the frame identification signal at the time of the insert edition and an insert edition interrupting means 31 which ends the insert edition when the reference frame identification signal and the frame identification signal deviate in response with the output of this comparing means 30.

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 / reproducing images, sounds, data, etc. on a tape.

[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 referred to as VTR), has been put into practical use and is in widespread use. In addition, each company is developing a smaller device and a digital device by further increasing the recording density. Particularly in the case of digital recording, it is possible to divide the tracks recorded on the tape and separately record information such as audio information and video information.
In that case, there may be a request to edit audio information and video information independently during editing. An example of a conventional magnetic recording / reproducing apparatus for performing such editing (hereinafter referred to as insert editing) will be described.

FIG. 5 is an example of a track configuration diagram on a tape of a conventional magnetic recording / reproducing apparatus. As shown in the figure, the tracks are divided into gaps G1 to G3, and in order from the beginning, an insert information area (ITI) in which a positioning information signal for locating an edit point when performing the insert edit is embedded is provided. Area), an audio area where audio signals are recorded (AUDIO area), a video area where video signals are recorded (VIDEO area), and a subcode area (S where information such as time code of each track is recorded).
Four areas (UBCODE area) are formed during recording. A pilot signal for performing tracking control at the time of insert editing is multiplexed and recorded together with the positioning information signal in the first ITI area. In this description, it is assumed that two types of pilot signals recorded at different frequencies f1 and f2 are alternately recorded every other track.

In the case of such a track structure, the VID
The operation when the insert edit is desired only in the EO area will be described. Now, it is assumed that the head is scanning the track 40. First, the reproduction mode is set in the scanning portion at the beginning of the track, and the IT of the adjacent track of the main scanning track is set.
Tracking control is performed using two pilot signals that leak from the I region as crosstalk. On the other hand, the track position reference signal is obtained by detecting the positioning signal in the ITI area. Based on this track position reference signal, when the head of the video area is designated, the mode is switched from reproduction to recording and overwriting is performed, and the recorded information signal is erased and a new information signal is recorded at the same time. .

[0005]

In the digital VTR, the amount of data to be handled is much larger than that in the case of analog recording. Therefore, so-called one-screen information (hereinafter,
This unit is referred to as one frame) cannot be recorded with one recording track and is divided into a plurality of recording tracks. Now track 1
It is assumed that one frame is composed of zero lines. When performing data processing, it is required to set this one frame as a unit.

However, in the track configuration of the conventional magnetic recording / reproducing apparatus (FIG. 5) as described above, at the time of insert editing, no information regarding the frame including the track can be obtained from the track. Therefore, even if the tracking using the ITI area is deviated due to some malfunction during the insert editing (there is a possibility that it shifts every four tracks), the insert editing is continued as it is.
As a result, as shown in (FIG. 6), for example, VIDEO
Only the discontinuity of the frame of the area is recorded in a form shifted from other areas. When the inserted area is reproduced next time, the frames of the audio signal and the video signal are reproduced in a shifted state, which causes a serious defect in the operation of the system.

An object of the present invention is to provide a magnetic recording / reproducing device which solves the above problems.

[0008]

In order to solve the above problems, the magnetic recording / reproducing apparatus of the present invention has M recording tracks (at least two recording areas having at least two areas obliquely recorded on a magnetic tape). , M is an integer of 4 or more) is one frame, and a tracking pilot signal that circulates in N recording tracks (where N is an integer of 4 or more) is multiplexed and recorded together with the data signal on each of the recording tracks. The first area of the recording track is recorded on the tape medium in which the frame identification signal for distinguishing the frame together with the pilot signal is recorded in the first area of the track.
In the insert editing for rewriting a predetermined area other than the area, the magnetic recording is performed while the magnetic head is scanning the first area, and the tracking control is performed based on the pilot signal leaking from the first area of the adjacent track to the main scanning track. A reproducing device, which compares the reference frame identification signal accompanying the edit information signal with a frame identification signal obtained by scanning / reproducing the first area during insert editing; and an output of the comparing means. In response, when the reference frame identification signal and the frame identification signal are deviated from each other, insert interruption means for terminating the insert editing is provided.

Further, instead of the insert interruption means, a warning means for outputting a warning signal when the reference frame identification signal and the frame identification signal are deviated in response to the output of the comparison means is provided.

Further, instead of the insert interruption means, when the reference frame identification signal and the frame identification signal are shifted in response to the output of the comparison means, the tape feed is performed so that the reference frame identification number and the frame identification number match. And a tape feed adjusting means for adjusting.

[0011]

According to the present invention, since the frame identification signal for discriminating the frame is recorded in the first area of the track,
Even during insert editing, the reference frame identification signal accompanying the edit information signal is compared with the frame identification signal obtained by scanning / reproducing the first area. If the reference frame identification signal and the frame identification signal are deviated, End insert editing. As a result, only a part of the area does not produce a track in which the frame breaks are displaced.

Further, if a warning signal is issued when the reference frame identification signal and the frame identification signal are deviated,
It is possible to confirm externally that the insert editing causes the frame to shift.

Further, if the tape feed adjusting means is provided to adjust the tape feed so that the reference frame identification number and the frame identification number match when the reference frame identification signal and the frame identification signal are deviated, The frame shift can be automatically corrected.

[0014]

Embodiments of the magnetic recording / reproducing apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of the essential parts of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, showing the operating principle during insert editing. Reference numerals 1a and 1b denote heads mounted on a rotary cylinder (not shown), 20a to 2b.
Tracks 0e are formed on the tape 8. 3a and 3b are band pass filters, 4a and 4b are AM
A detection circuit, a differential circuit 5 and a capstan control circuit 6 control the capstan motor 7. 9 is a reel for winding the tape 8. Further, 11 is a positioning signal detecting means for detecting a positioning signal of an ITI area of a track which will be described later, 12 is a timing generation circuit for generating a pilot signal sample signal and an edit timing signal in response to the positioning signal detecting means 11, 13 Is an edit changeover switch for switching the mode of the apparatus from reproduction to recording in response to the edit timing signal from the timing generation circuit 12, and 30 is a frame identification signal in an ITI area described later and a reference frame identification signal accompanying the edit information signal. Reference numeral 31 is a frame identification signal comparing means, and 31 is an insert editing interruption means for sending a command signal to the capstan control circuit 6 in response to the signal from the frame identification signal comparing means 30.

FIG. 2 is a diagram showing an example of a head arrangement on a cylinder used in the magnetic recording / reproducing apparatus of the present invention. Reference numeral 10 is a cylinder on which a head is mounted. And as shown in the figure, the combination heads 1a, 1b and 2a, 2
b is mounted on the cylinder 10 so as to face each other by 180 degrees, and two tracks are recorded / reproduced on the tape 8 substantially simultaneously by the respective combi heads.

FIG. 3 shows a configuration diagram of recording tracks in the embodiment of the present invention. Tracks are gaps G1 to G
3, the insert information area (ITI) in which a positioning information signal for positioning the edit point when performing the insert edit is embedded in order from the beginning.
Area), an audio area (AUD) in which audio signals are recorded
IO area), video area where video signals are recorded (VID
Four areas, that is, an EO area) and a subcode area (SUBCODE area) in which information such as the time code of each track is recorded are formed during recording. In addition, the inside of each area of the audio, video, and subcode in the track is divided into segments, and the synchronization signal (S
sync), actual data, and correction signal are digitally recorded.

Further, a pilot signal for performing tracking control at the time of insert editing is multiplex-recorded together with the positioning information signal in the first ITI area (including digital multiplex-recording). In this case, an example is shown in which two types of pilot signals recorded at different frequencies f1 and f2 are alternately recorded every other track. As the pilot signal, generally, one to four kinds of low frequencies, which do not interfere with the information signal, are selected and sequentially switched and recorded.

Further, a frame identification signal for distinguishing frames is recorded in a part of the ITI area. How to attach the frame identification signal will be described below. One frame is composed of 10 tracks. Considering the use of the pilot signal in the configuration of 10 tracks per frame, the arrangement of pilot signals in a frame causes frames in which the arrangement of pilot signals differs. However, the number of tracks in one frame and the number of tracks in which the pilot signal makes one round are not subdivisions, that is, (the number of tracks in one frame) / (the number of tracks in which the pilot signal makes one round), or The condition is that the number of tracks that make one round) / (the number of tracks of one frame) is not an integer. In this example, the frame has a period of 10 tracks, and the pilot signal has a period of 4 tracks, so that the frames are not divisible by each other.

The frame period and the pilot signal period are first synchronized at the least common multiple of 10 and 4, that is, 20 tracks. That is, two (20 divided by 10) distinguishable frames are generated depending on the arrangement of pilot signals in the frame. This distinguishes the frames, first f
The frame identification number of the frame in which 1 appears is "0", and 0 is recorded as the frame identification number in all the ITI areas of the tracks in this frame. Further, the frame identification number of the frame in which f2 first appears is set to "1", and 1 is recorded as the frame identification number in all the ITI areas of the tracks in this frame.

In the track thus formed,
The operation during insert editing in which the information signal is rerecorded from above will be described with reference to (FIG. 1) and (FIG. 4). FIG. 4 is a timing chart during insert editing in one embodiment of the magnetic recording / reproducing apparatus of the present invention.

First, at the time of insert editing (FIG. 1), in the ITI area at the head of the track 20a, the switch 13 is connected to the terminal 13b and brought into a reproducing state for receiving a signal from the head 1a. At this time, the output from the head 1a includes tracks 20c and 2 next to the track 20d.
Since the leak components of different pilot signal components f1 and f2 recorded in the ITI area of 0e are included, it is possible to know the relative positional relationship between the head and the desired track by comparing their amounts. it can.

The f1 and f2 components detected by the band-pass filters 3a and 3b are AM detection circuits 4a and 4 respectively.
It is converted into a DC component according to the level by b and compared by the difference circuit 5. The output of the difference circuit 5 is a relative position error between the head 1a and the track 20d to be reproduced, that is, a tracking error signal. On the other hand, the signal from the head 1a is also input to the positioning signal detecting means 11, and when the positioning information signal recorded in the ITI area is detected, the track position reference signal shown in FIG. 4B is obtained. obtain. This track position reference signal is sent to the timing generation circuit 12, and the timing generation circuit 12 indicates the timing for sampling the tracking error signal as shown in FIG. 4C based on the track position reference signal. Is generated. The tracking error signal sampled by the sampler 14 based on this pilot sample signal is input to the capstan control circuit 6 and drives the capstan motor 7 to feed the tape so that the head 1a comes to the center of the track 20d. To control.

Further, the timing generation circuit 12 also generates an edit timing signal indicating a position for editing the area after the ITI area, as shown in FIG. 4D, similarly to the pilot sample signal. The example in this figure is VIDE
This is an edit timing signal for rewriting the O area.
Only when this edit timing signal is "H", switch 1
3 is switched from the terminal 13b to the terminal 13a, a new information signal is added to the head 1a, and the information signal recorded in the VIDEO area is rewritten to the new information signal. Further, the switch 13 is switched from the terminal 13b to the terminal 13a by the timing signal generated by the timing generation circuit 12, and a new information signal is added to the head 1a, and at the same time, a switch (not shown) for the head 1b is also provided. As a result, another new information signal is added, so that the information signal recorded in the VIDEO area is rewritten into the new information signal in two tracks almost at the same time. Further, since the head 1b is arranged very close to the head 1a, and the relative positional relationship between the head 1a and the head 1a can be accurately ensured, the head 1a and the track 20d are tracked, so that the head 1b and the track 20c are tracked. Tracking can also be achieved at the same time.

As described above, while the insert edit is performed, the frame identification signal comparison means 30 sends the frame identification number in the ITI area of the track being scanned and the reference sent together with the edit information signal. The frame identification signal is input and compared. When the frame identification signal on this track and the reference frame signal accompanying the editing information signal are deviated, the frame of the track being scanned is deviated from the frame of the signal to be insert-edited in the desired editing area of the track. This results in improper insert operation. Therefore, in the present embodiment, when the frame identification signal on the track and the reference frame signal associated with the editing information signal are deviated, the frame identification signal comparison means 30 sends the signal indicating the comparison result to the insert editing interruption means 31. Send to. Upon receiving the signal from the frame identification signal comparison means 30, the insert edit interruption means 31 immediately issues a command to the capstan control circuit 6 to interrupt the insert edit operation.

The insert editing interruption means 31 can be replaced with a warning means (not shown). In this case, the warning means, which has received the signal indicating that the "frame has been shifted" from the frame identification signal comparison means 30, outputs a warning signal and displays it in a form that can be recognized by the user, for example, LED display or sound. Or occur.

Further, the insert editing means 31 can be replaced with a tape feed adjusting means (not shown). The operation in this case will be described. Frame identification signal comparison means 3
The tape feed adjusting means, which has received the signal from 0 indicating that the frame has been displaced, is the capstan control circuit 6
Command to forcibly drive the capstan motor 7 to feed the tape 8 to the lock position next to the current tracking lock position (4 tracks ahead in this example). At that position, the signal from the frame identification signal comparison means 30 is waited again. If the signal "the frame is shifted" still remains, the above-mentioned forced tape feeding is performed again. In the same manner, this adjustment operation is continued until there is no difference between the frame identification signal and the reference frame identification signal.

As described above, according to this embodiment, since the frame identification signal for discriminating the frame is recorded in the first area of the track, the reference frame identification signal associated with the edit information signal can be used even during the insert editing. Scanning of the first area
The frame identification signal obtained by reproduction is compared, and if the reference frame identification signal and the frame identification signal deviate, the insert editing can be ended. As a result, only a part of the area does not generate a track in which the frame breaks are displaced.

If the reference frame identification signal and the frame identification signal are deviated from each other, a warning signal is generated so that the frame is deviated from the insert edit. ) Can be confirmed.

Further, by providing the tape feed adjusting means for adjusting the tape feed so that the reference frame identification number and the frame identification number match when the reference frame identification signal and the frame identification signal are deviated, the frame is adjusted. The deviation can be automatically corrected.

In this embodiment, an example of simultaneous recording on two channels is shown, but the combination and arrangement of heads are not limited to this embodiment, and the same can be applied to other cases.

In this embodiment, one frame is described as being composed of 10 tracks, but the number of tracks in one frame can be set arbitrarily.

In this embodiment, there are two types of tracking pilot signals, but four types of frequency pilot signals such as those used in 8 mm video may be used. It is not limited to one.

Furthermore, in the present embodiment, frame identification was performed based on the difference in the arrangement of pilot signals in the frame, but other identification methods may be used and the frame identification number may be assigned in one way. Not limited. Further, the method of inserting the positioning information signal is not limited to this embodiment,
For example, the coincidence of digital patterns may be detected.

[0035]

As described above, since the magnetic recording / reproducing apparatus of the present invention records the frame identification signal for discriminating the frame in the first area of the track, it accompanies the editing information signal even during the insert editing. Reference frame identification signal and first
When the reference frame identification signal and the frame identification signal are deviated from each other, the insert editing can be ended. As a result, only a part of the area does not generate a track in which the frame breaks are displaced.

Further, a warning means is provided in place of the insert editing interruption means, and a warning signal is generated when the reference frame identification signal and the frame identification signal are deviated, so that the frame is subjected to the insert editing in which the frame is shifted. It is possible to confirm that there is an outside.

Further, a tape feed adjusting means is provided in place of the insert editing interruption means, and when the reference frame identification signal and the frame identification signal are deviated, the tape feeding is performed so that the reference frame identification number and the frame identification number match. By adjusting, it is possible to automatically correct the frame shift.

[Brief description of drawings]

FIG. 1 is a block diagram of a principal part showing an operation principle during insert editing of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a head arrangement on a cylinder used in the present invention.

FIG. 3 is a diagram showing an embodiment of a recording track recorded by a magnetic recording / reproducing apparatus of the present invention.

FIG. 4 is a timing chart showing the timing of signals at various parts during insert editing of the magnetic recording / reproducing apparatus in an embodiment of the present invention.

FIG. 5 is a configuration diagram of recording tracks in a conventional magnetic recording / reproducing apparatus.

FIG. 6 is a diagram showing a frame shift that occurs during insert editing of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1a, 1b Heads 3a, 3b Bandpass filter 4a, 4b AM detection circuit 5 Differential circuit 8 Tape 9 Reel 13 Editing changeover switch 20a-20e Track

Claims (3)

[Claims] 1. M recording tracks having at least two or more areas recorded obliquely on a magnetic tape (however,
M is an integer of 4 or more, and one frame includes N recording tracks (where N is 4) in each of the recording tracks.
A tape in which a tracking pilot signal circulated with the above integer) is multiplex-recorded together with a data signal, and a frame identification signal for distinguishing the frame together with the pilot signal is multiplex-recorded in the first area of the recording track. In the insert edit in which a predetermined area other than the first area of the recording track is rewritten on the medium, the magnetic head leaks from the first area of the adjacent track to the main scanning track while the magnetic head scans the first area. A magnetic recording / reproducing apparatus for performing tracking control based on a pilot signal, wherein a reference frame identification signal accompanying the edit information signal at the time of insert editing and the frame identification signal obtained by scanning / reproducing the first area Comparing means for comparing and the reference frame in response to the output of the comparing means That it comprises an insert interruption means for terminating the insert editing when the frame identification signal to another signal is shifted magnetic recording reproducing apparatus according to claim. 2. M recording tracks having at least two or more areas diagonally recorded on a magnetic tape (however,
M is an integer of 4 or more, and one frame includes N recording tracks (where N is 4) in each of the recording tracks.
A tape in which a tracking pilot signal circulated with the above integer) is multiplex-recorded together with a data signal, and a frame identification signal for distinguishing the frame together with the pilot signal is multiplex-recorded in the first area of the recording track. In the insert edit in which a predetermined area other than the first area of the recording track is rewritten on the medium, the magnetic head leaks from the first area of the adjacent track to the main scanning track while the magnetic head scans the first area. A magnetic recording / reproducing apparatus for performing tracking control based on a pilot signal, wherein a reference frame identification signal accompanying the edit information signal at the time of insert editing and the frame identification signal obtained by scanning / reproducing the first area Comparing means for comparing and the reference frame in response to the output of the comparing means Magnetic recording and reproducing apparatus characterized by comprising a warning means for outputting a warning signal when the frame identification signal to another signal is shifted. 3. M recording tracks having at least two areas obliquely recorded on a magnetic tape (however,
M is an integer of 4 or more, and one frame includes N recording tracks (where N is 4) in each of the recording tracks.
A tape in which a tracking pilot signal circulated with the above integer) is multiplex-recorded together with a data signal, and a frame identification signal for distinguishing the frame together with the pilot signal is multiplex-recorded in the first area of the recording track. In the insert edit in which a predetermined area other than the first area of the recording track is rewritten on the medium, the magnetic head leaks from the first area of the adjacent track to the main scanning track while the magnetic head scans the first area. A magnetic recording / reproducing apparatus for performing tracking control based on a pilot signal, wherein a reference frame identification signal accompanying the edit information signal at the time of insert editing and the frame identification signal obtained by scanning / reproducing the first area Comparing means for comparing and the reference frame in response to the output of the comparing means Magnetic recording and reproducing apparatus characterized by comprising a tape feeding adjusting means for adjusting the tape feeding as said reference frame identification number and the frame identification number matches when the frame identification signal to another signal is shifted.