JPH07110989A - Magnetic recording and reproducing apparatus - Google Patents

Abstract

PURPOSE:To finish an insertion editing operation when a reference track number is deviated from a reproducing track number by a method wherein a track number which discriminates a track inside a frame is recorded in regions other than a first region in the track. CONSTITUTION:In an insertion editing operation, a switch 13 is connected to a terminal 13b in an ITI region at the front of a track 20a, and a resproducing state that a signal from a head 1a is supplied is set. At this time, an output from the head 1a is recorded in the ITI region of tracks 20c, 20e which are adjacent to a track 20d. Since a leakage component from different pilot-signal components f1, f2 is included, their amounts are compared, and the relative positional relationship between a head and a desired track can be known. The components f1, f2 which have been detected by band-pass filters 3a, 3b to relaize it are converted into DC components corresponding to their levels by respective AM detection circuits 4a, 4b, and they are compared by a difference circuit 5. The output of the circuit 5 becomes a relative positional error between the head 1a and the track 20d, i.e., a tracking-error signal.

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 abbreviated as VTR) has been put into practical use and prevailing. In addition, each company is developing a smaller device and a digital device by further increasing the recording density. Especially when digital recording is performed, 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. Edit like this (below,
An example of a conventional magnetic recording / reproducing apparatus in the case of performing insert editing) and its problems 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 (FIG. 5), the track has an insert information area (ITI) in which a positioning information signal is embedded from the beginning for positioning the edit point when performing the insert edit from the beginning by the gaps G1, G2, and G3. Area), an audio area in which an audio signal is recorded (AUDIO area), a video area in which a video signal is recorded (VIDEO area), and a subcode area (SUBCODE area) in which information such as time code of each track is recorded. Two areas 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 case, 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, an operation when it is desired to perform insert editing only in the video area will be described. In FIG. 5, it is assumed that the head is scanning the track 40. First, the scanning mode at the beginning of the track is set to the reproduction mode, and tracking control is performed using the two pilot signals that leak from the ITI areas of the adjacent tracks 41 and 42 of the main scanning track 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, the mode is switched from reproduction to recording at the timing of designating the beginning of the video area, 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 by one recording track and is divided into a plurality of recording tracks. Now, it is assumed that 10 tracks form one frame. in this case,
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 shown in (FIG. 5), 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 a result, as shown in (FIG. 6), for example, only a frame break in the VIDEO 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 state of being shifted from each other, which causes a serious defect in the operation of the system.

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

[0008]

In order to solve the above-mentioned problems, the magnetic recording / reproducing apparatus of the present invention has M (M) recording tracks having at least two areas obliquely recorded on a magnetic tape. Is an integer greater than or equal to 4) and one frame,
Each of the recording tracks has N recording tracks (N
Is a multiple of 4 or more), and a tracking pilot signal which is circulated in multiples is recorded together with a data signal, and track numbers for distinguishing tracks in the frame are multiplex-recorded in areas other than the first area of the recording track. In an insert edit in which a predetermined area other than the first area of the recording track is rewritten on the tape medium, the magnetic head is scanning the first area and the first area of the adjacent track of the main scanning track is being read. A magnetic recording / reproducing apparatus for performing tracking control based on the pilot signal leaked from the recording medium, which is obtained by scanning / reproducing a region other than the reference track number and the predetermined region accompanying the editing information signal during the insert editing. Comparing means for comparing the track numbers, and the reference track in response to the output of the comparing means. Click number and the track number is provided an insert interruption means for terminating the insertion editing when displaced.

Further, instead of the insert interrupting means, a warning means for outputting a warning signal when the reference track number and the track number are deviated in response to the output of the comparing means is provided.

Further, instead of the insert interrupting means, when the reference track number and the track number are displaced in response to the output of the comparing means, the adjusting means is provided for adjusting the tape feed so that the reference track number and the track number match. It can also be configured to do so.

[0011]

According to the present invention, since the track number for discriminating the track in the frame is recorded in the area other than the first area of the track, the reference track number attached to the edit information signal even at the time of insert editing, Compare with the track number obtained by scanning / playing the unedited area,
If the reference track number and the reproduction track number are different 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, if the reference track number and the reproduction track number are deviated, a warning signal is issued so that it can be confirmed from the outside that the insert editing is performed in which the frame deviates.

Further, if the reference track number and the reproduction track number are deviated from each other, an adjusting means for adjusting the tape feed so that the reference track number and the reproduction track number coincide with each other is provided, so that the frame misalignment is automatically performed. Can be 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 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 are heads attached to a rotary cylinder (not shown), and 20a to 20e are tracks formed on the tape 8, respectively. 3a,
3b is a band pass filter, 4a and 4b are AM detection circuits,
Reference numeral 5 is a differential circuit, and 6 is a capstan control circuit, which controls the capstan motor 7. 9 is a reel for winding the tape 8. Furthermore, 11 is the ITI of the track to be described later.
Positioning signal detecting means for detecting the positioning signal of the area, 12 is a timing generating circuit for generating the pilot signal sample signal and the edit timing signal in response to the positioning signal detecting means 11, and 13 is the timing generating circuit 1.
An edit changeover switch for switching the mode of the apparatus from playback to recording in response to the edit timing signal from 2;
Is a track number comparison means for comparing a reproduction track number, which will be described later, with a reference track number associated with the edit information signal,
Reference numeral 31 is insert edit interrupting means for sending a command signal to the capstan control circuit 6 in response to a signal from the track number comparing means 30.

FIG. 2 shows a layout of heads on a cylinder in an embodiment of the present invention. Reference numeral 10 is a cylinder on which a head is mounted. As shown in the figure, the combination heads 1a, 1b and 2a, 2b are placed on the cylinder 10
The recording tracks in the embodiment of the present invention are shown in FIGS. 3A and 3B, which are mounted so as to face each other at 0 degrees and two tracks are recorded / reproduced on / from the tape 8 at substantially the same time by each combination head (FIG. 3). The gaps G1 to G3 in the track allow the insert information area (ITI area) in which the positioning information signal for positioning the editing point is inserted from the beginning when the insert editing is performed, the audio area in which the audio signal is recorded ( AUDIO area), video area in which video signals are recorded (VIDEO area), subcode area (SU in which information such as time code of each track is recorded.
Four areas (BCODE area) are formed during recording. Further, the inside of each of the audio, video, and sub-code areas in the track is divided into segments, and the sync signal (Sync), actual data, and correction signal are digitally recorded in each segment.

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). This embodiment shows an example 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 track number for discriminating tracks in a frame is recorded in a part of each of the AUDIO area, the VIDEO area, and the SUBCODE area. In this embodiment, one frame is the track 10
It is composed of books, and the track numbers are set from 0 to 9.

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 at the time of insert editing in one embodiment of the magnetic recording / reproducing apparatus of the present invention.

At the time of insert editing (FIG. 1), the switch 1 is set in the ITI area at the head of the track 20a.
3 is connected to the terminal 13b, and is in a reproduction state in which the signal from the head 1a is supplied. At this time, the output from the head 1a includes tracks 20c and 20e next to the track 20d.
Since the leak components of different pilot signal components f1 and f2 recorded in the ITI area of 1 are included, the relative positional relationship between the head and the desired track can be known by comparing their amounts. In order to realize this, f detected by the band pass filters 3a and 3b
The 1 and f2 components are converted into direct current components according to their levels by the AM detection circuits 4a and 4b, respectively, and are compared by the difference circuit 5. The output of the difference circuit 5 is the head 1a.
And a relative position error from 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 (FIG. 4).
The track position reference signal shown in (b)) is obtained. 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 based on the track position reference signal as shown in FIG. 4C. A sample signal is generated, and the tracking error signal sampled by the sampler 14 based on the pilot sample signal is input to the capstan control circuit 6 to drive the capstan motor 7 so that the head 1a comes to the center of the track 20d. To control the tape feed.

The timing generation circuit 12 also generates an edit timing signal indicating the position of the insert edit area, as shown in FIG. 4D, in the same manner as the pilot sample signal. The example of FIG. 4 is an edit timing signal when the insert edit area is the VIDEO area. Only when this edit timing signal is "H", the switch 13 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 a new information signal. Can be rewritten as In addition, the switch 13 causes the terminal 13b to operate according to the timing signal generated by the timing generation circuit 12.
To a terminal 13a, a new information signal is applied to the head 1a, and at the same time, another new information signal is applied to the head 1b, which is a combination with the head 1a, by a changeover switch (not shown). In the information signal recorded in the video area, two tracks are rewritten into a new information signal almost at the same time. Further, as shown in (FIG. 2), 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. Therefore, the head 1a and the track 20d are tracked. As a result, the head 1b and the track 20c
Tracking with and can be achieved at the same time.

While the insert editing is performed as described above, the track number comparing means 30 attaches the reproduction track number obtained by the reproduction of the non-editing area (in this case, the AUDIO area) and the editing information signal. The reference track numbers sent in are input, and these are compared. If the reproduction track number on this track and the reference track number attached to the edit information signal are deviated, the frame of the track being scanned and the frame of the signal to be insert-edited on the track are deviated as a result. Will result in improper insert operation. Therefore, when the reproduction track number on the track and the reference track number attached to the edit information signal are deviated, the track number comparing means 30 inserts the information signal into the insert edit interrupting means 31.
Send to. At this time, the insert edit interrupting means 31 which has received the signal from the track number comparing means 30 immediately issues a command to the capstan control circuit 6 to interrupt the insert editing operation.

Further, the insert editing means 31 can be replaced with a warning means for prompting a warning. In this case, the warning means, which has received the signal "the frame is shifted" from the track number comparison means 30, outputs the warning signal to the outside (for example, displays the warning information on the display panel of the device) and informs the user. Communicate to that effect.

Further, the insert editing means 31 can be replaced with an adjusting means. The operation in this case will be described. The adjusting means, which has received the signal "the frame is shifted" from the track number comparing means 30, issues a command to the capstan control circuit 6 to forcibly drive the capstan motor 7 to move to the next tracking lock position. The tape 8 is fed to the lock position (4 tracks ahead of the track in this embodiment). Then, at that position again, the track number comparison means 30
Wait for the signal from. 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 reproduction track number and the reference track number.

As described above, according to this embodiment, since the track number for discriminating the track in the frame is recorded in the area other than the first area of the track, it is attached to the edit information signal even during the insert edit. The reference track number to be edited is compared with the track number obtained by scanning / reproducing the unedited area, and if the reference track number and the reproduction track number are different, the insert editing can be ended. As a result, only a part of the area does not produce a track in which the frame breaks are displaced.

Further, if the reference track number and the reproduction track number are deviated, a warning signal is issued so that it can be confirmed from the outside that the insert editing is performed in which the frame deviates.

Further, when the reference track number and the reproduction track number are deviated, an adjusting means is provided for adjusting the tape feed so that the reference track number and the reproduction track number are coincident with each other, so that the frame deviation is automatically generated. Can be corrected.

In this embodiment, the case of simultaneous recording on two channels is shown, but the present invention is not limited to the combination and arrangement of the heads in this embodiment, and can be similarly applied to other cases.

In this embodiment, one frame has 10 tracks, but the number of tracks in one frame can be set arbitrarily. The method of assigning the track number in the frame is not limited to the method described in this embodiment, and can be set arbitrarily.

In this embodiment, the track number is not recorded in the ITI area. Of course, the track number may be recorded in the ITI area, and the area for inserting the track number is not limited uniquely.

Further, in the present embodiment, two kinds of tracking pilot signals having different frequencies are shown. However, pilot signals of four kinds of frequencies as used in 8 mm video may be used. The way of inserting the signal is not limited.

Further, the method of inserting the positioning information signal is not limited to that of this embodiment, and the coincidence of digital patterns may be detected.

[0034]

As described above, in the information reproducing apparatus of the present invention, the track number for distinguishing the track in the frame is recorded in the area other than the first area of the track. The reference track number attached to the information signal is compared with the track number obtained by scanning / reproducing the area not edited, and when the reference track number and the reproduced track number are deviated, the insert editing can be ended. As a result, only a part of the area will not produce a track in which the frame breaks are displaced.

Further, by providing a warning means for outputting a warning signal and outputting a warning signal when the reference track number and the reproduction track number are deviated, the frame is misaligned for insert editing. It can be confirmed from the outside.

Further, when the reference track number and the reproduction track number are deviated from each other, by providing an adjusting means for adjusting the tape feeding so that the reference track number and the reproduction track number are coincident with each other, a frame deviation is automatically generated. Can be corrected to.

[Brief description of drawings]

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

FIG. 2 is a layout view of heads on a cylinder according to 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 diagram 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 (M is an integer of 4 or more) having at least two areas diagonally recorded on a magnetic tape are one frame, and each of the recording tracks has actual data. The recording is performed on a tape medium in which a tracking pilot signal circulating in N recording tracks (N is an integer of 4 or more) and a track number for discriminating tracks in the frame are multiplex-recorded together with a signal. In insert editing in which a predetermined area other than the first area of the track is rewritten, tracking is performed based on a pilot signal that leaks from the first area of the adjacent track of the main scanning track while the magnetic head is scanning the first area. A magnetic recording / reproducing apparatus for controlling, wherein a reference track number associated with an insert edit information signal at the time of the insert edit and an index If the reference track number and the reproduction track number are deviated in response to the output of the comparison means and the comparison means for comparing the reproduction track number obtained by scanning / reproduction of the area other than the edit area. A magnetic recording / reproducing apparatus comprising: an insert interrupting means for ending the insert editing. 2. M recording tracks (M is an integer of 4 or more) having at least two areas diagonally recorded on a magnetic tape are one frame, and each of the recording tracks has actual data. The recording is performed on a tape medium in which a tracking pilot signal circulating in N recording tracks (N is an integer of 4 or more) and a track number for discriminating tracks in the frame are multiplex-recorded together with a signal. In the insert edit in which a predetermined area other than the first area of the track is rewritten, based on the pilot signal leaking from the first area of the adjacent track of the main scanning track while the magnetic head is scanning the first area. A magnetic recording / reproducing apparatus for performing tracking control, wherein a reference track number associated with an insert edit information signal during the insert edit, Comparison section for comparing with a reproduction track number obtained by scanning / reproducing an area other than the insert editing area, and a warning when the reference track number and the reproduction track number are shifted in response to the output of the comparing section. A magnetic recording / reproducing apparatus comprising: a warning unit that outputs a signal. 3. M recording tracks (M is an integer of 4 or more) having at least two areas diagonally recorded on a magnetic tape are one frame, and each of the recording tracks has actual data. The recording is performed on a tape medium in which a tracking pilot signal circulating in N recording tracks (N is an integer of 4 or more) and a track number for discriminating tracks in the frame are multiplex-recorded together with a signal. In the insert edit in which a predetermined area other than the first area of the track is rewritten, based on the pilot signal leaking from the first area of the adjacent track of the main scanning track while the magnetic head is scanning the first area. A magnetic recording / reproducing apparatus for performing tracking control, wherein a reference track number associated with an insert edit information signal during the insert edit, Comparing means for comparing with a reproduction track number obtained by scanning / reproducing an area other than the insert edit area, and when the reference track number and the reproduction track number are deviated in response to the output of the comparing means, A magnetic recording / reproducing apparatus comprising: an adjusting unit that adjusts a tape feed so that a reference track number and the reproducing track number match.