JPH0973763A - Recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the continuity of a track number by changing a recording rules according to a traveling speed ratio when a track number is recorded plurality of recording modes having different traveling speeds for a recording medium. SOLUTION: A control circuit 14 controls an ATN(absolute track number) generating circuit 11 according to the standard time (SP) and long time (LP) mode switches 13c of an operation part 13 and records the information of a video input 1 and ATN information in a tape 7. Also, a servo circuit 22 is controlled so as to travel the tape 7 at a speed according to a SP/LP mode. When the signals of the SP/LP mode having different track pitches are recorded in a mixed manner, a track number is decided based on a track pitch ratio (traveling speed ratio) and an ATN increase portion increased by the SP mode is distributed to the track of the LP mode. Thus, the continuity of the track number is maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus, and more particularly to an apparatus having a plurality of modes with different recording times.

[0002]

2. Description of the Related Art As this type, a digital VTR for recording / reproducing a digital signal on a magnetic tape by using a rotary head has been conventionally known.

In recent years, the absolute track number (Absolute) from the beginning of the tape has been added to each track on the magnetic tape together with the video signal and the audio signal for the purpose of retrieving recording signals.
Track Number: ATN) is considered to be recorded.

For example, in a video camera, the shooting date and the ATN at the time when the shooting date is changed are combined and stored, and based on this, a high-speed search of the changed position of the shooting date becomes possible.

[0005]

In such a digital VTR as well, in addition to the normal recording mode, the tape transport speed is lowered for the purpose of lengthening the recording time,
A so-called long-time mode (hereinafter referred to as LP mode) that narrows the track pitch to improve the recording density is also conceivable.

When such an LP mode is put to practical use, it is naturally conceivable to insert-record in the LP mode on a tape originally recorded in the standard mode (hereinafter referred to as SP mode).

With respect to the above-mentioned ATN information, when the ATN is counted up and recorded one by one for each track in the LP mode as in the SP mode,
Due to the difference in the number of tracks formed with the same tape length, the ATN becomes discontinuous at the end point of the insert.

That is, the same ATN is recorded twice on the track in which the insert signal is recorded in the LP mode and the track originally recorded in the SP mode.

On the contrary, when insert recording is performed in the SP mode on the tape recorded in the LP mode, the ATN is greatly skipped at the end point of the insert.

Therefore, with the tape in which the SP mode and the LP mode are mixed as described above, it is not possible to perform the above-described desirable search operation.

An object of the present invention is to solve the above-mentioned problems and to eliminate the discontinuity of track numbers even when signals are recorded in a plurality of recording modes.

[0012]

SUMMARY OF THE INVENTION In order to solve the problems conventionally held and to achieve the above object, the present invention is an apparatus for forming a number of tracks on a recording medium to record an information signal, Conveying means for conveying a recording medium having a plurality of recording modes having different track pitches, and recording means for recording track number information indicating the track number on a number of tracks formed on the recording medium. When,
In the plurality of recording modes, the recording medium is configured to include a control unit that substantially changes the change amount of the track number with respect to a predetermined transport amount of the recording medium.

[0013]

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

FIG. 1 shows a digital V in an embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of a TR.

First, the operation during recording will be described.

The video input circuit 1 outputs an externally supplied digital video signal to the recording signal processing circuit 2. The recording signal processing circuit 2 compresses the information amount of the input digital video signal by using a well-known technique such as DCT and quantization, further block-codes every predetermined number of pixels, and outputs it to the format processing circuit 3.

The control circuit 14 operates the switch 1 according to the recording switch 13a and the mode switch 13c of the operation unit 13.
0, ATN generation circuit 11 and sub-code generation circuit 12 are controlled to generate the sub-code including the ATN information.

That is, the control circuit 14 switches the switch 1 according to the recording mode selected by the mode switch 13c.
0 to switch ATN table SP8 or ATN
Select table LP9. The ATN table 8 and the ATN table 9 store the ATNs to be generated in the SP and LP modes, respectively, and the ATN generating circuit 11 generates ATN information based on these ATN tables, and the ATN generating circuit 11 Output.

The sub-code generating circuit 12 is controlled by the control circuit 14 to generate useful information such as a time code, an input source and a recording mode in addition to the ATN information and output it to the format processing circuit 3.

The format processing circuit 3 converts the video signal from the recording signal processing circuit 2 and the sub-code into a bit stream conforming to the format shown in FIG. 2 and also uses ITI (Inse) for generating an operation clock during reproduction.
rt Track Information) data is added and output to the recording circuit 4. The recording circuit 4 digitally modulates the data output from the format processing circuit 3 so as to include a pilot signal component for tracking control during reproduction as described later, and supplies the data to the head 6 via the R terminal of the switch 5. To do.

The control circuit 14 also includes a mode switch 13
The servo circuit 22 is controlled to convey the tape 7 at a speed according to each mode according to c. The servo circuit 22 controls a mechanism 23 that performs a head rotating operation and a tape feeding operation in accordance with a control signal from the control circuit 14 to feed the tape 7 at a speed according to each mode. Further, the servo circuit 22 controls the rotation phase and the rotation speed of the head 6 so as to have a predetermined phase / speed.

FIG. 2 is a diagram showing a format of tracks formed on the tape 7 in this embodiment. In this embodiment, the recording areas are set in the order of ITI, audio, video and sub-code in one track to record each data, and each area is divided by the rotation phase of the head. Further, as described above, the ATN information is data recorded in the subcode area, and the recording area is secured in all tracks regardless of the mode.

In this embodiment, the SP mode and the SP mode
Narrower track pitch and slower tape transport
LP mode and track pitch l of each mode_SPWhen
l_LPAnd 10 μm and 2/3 × 10 μm, respectively.
In other words, the track pitch ratio of these modes is 1: 2.
/ 3. Then, the tape transport speed v in the LP mode _LP
Becomes 2/3 of SP mode, and these ratios are also
It becomes 1: 2/3.

Further, in the present embodiment, one frame of video signal is recorded on ten tracks, and as a tracking system during reproduction, as described above, every other track contains pilot signal components of frequencies f1 and f2. The recording data is modulated as follows.

Therefore, 20 tracks (= 2 frames)
The unit is such that the rotations of the track and the pilot signal component match.

FIG. 3 is a diagram showing the state of tracks on the tape when insert recording is performed in the LP mode in the area already recorded in the SP mode in this embodiment. FIG. 3 (a) shows a state before insertion, (b)
Shows the state after insertion.

FIG. 3 shows the operation when insert recording of m2 frames of LP mode in the recording area for m1 frames of SP mode. Here, in this embodiment,
Ratio of track pitch between SP mode and LP mode (1: 2
/ 3) and the common multiple of the rotation cycle of the pilot frequency described above, the number of tracks at the time of insert recording is determined. That is, 60 tracks (6 frames of video signal) are recorded in the LP mode for an area where 40 tracks (4 frames of video signal) are recorded in the SP mode.

Then, if the ATN increment 40, which increases by 40 tracks in the SP mode, is distributed to the 60 tracks in the LP mode, the continuity of the ATN before and after the insertion can be maintained.

40 A for 60 tracks in this LP mode
Although various methods of distributing TN can be considered, the method shown in FIG. 4 is used in this embodiment.

In this method, in the LP mode, the same ATN is arranged for every two tracks, and the ATN of +3 is corrected for each frame (10 tracks). And 6
Correction of +1 is performed every 0 tracks.

As a result, the increase amounts of ATN are exactly the same for the 40 tracks of SP mode and the 60 tracks of LP mode, that is, ATN for the same tape transport amount.
Can be made the same in each mode, and the continuity of ATN can be secured even in insert recording in another mode.

Further, as in the present embodiment, the number of tracks (the number of frames) at the time of insert recording is based on the common multiple of the track pitch ratio and the rotation period of the pilot.
Is determined, that is, if LP mode 6 frames are insert-recorded with SP mode 4 frames as a unit, not only the ATN continuity but also the pilot signal rotation continuity can be maintained.

FIG. 5 shows another arrangement method of the ATN. As described above, 40 ATNs may be arranged on 60 tracks in the LP mode, so that only 2 ATNs may be arranged for 3 tracks in the LP mode. Therefore, FIG.
As described above, for example, the same number is recorded every two tracks for the even numbered ATN, and only one track is recorded for the odd numbered ATN.

Even if the ATN is recorded in this manner, the continuity of the ATN before and after the insert recording is ensured.

Next, the operation during reproduction will be described.

First, a normal reproducing operation will be described.

The control circuit 14 controls the servo circuit 22 in response to the reproduction switch 13b to cause the mechanism 23 to convey the tape 7 and rotate the head 6 as described above.

The signal reproduced from the tape 7 by the head 6 is output to the reproduction processing circuit 15 via the P terminal of the switch 5. The reproduction processing circuit 15 detects digital data from the reproduction signal, demodulates it, and outputs it to the data separation circuit 16. Further, the data before demodulation is output to the ATF circuit 21.

The data separation circuit 16 separates the reproduction data into video, audio and subcode, outputs the subcode data to the subcode reproduction circuit 17 and outputs the video data to the reproduction signal processing circuit 19. The reproduction signal processing circuit 19 decodes the reproduced video data on a block-by-block basis, expands the amount of information, and outputs it to the video output circuit 20. The video output circuit 20 outputs the reproduced digital video signal to the outside.

Further, the sub-code reproducing circuit 17 reproduces the time code as described above from the sub-code data supplied from the data separating circuit 16 and outputs it to the control circuit 14, and at the same time outputs the ATN data to the ATN detecting circuit. Output to 18. The ATN detection circuit 18 detects the ATN of each track based on the ATN data in the subcode and outputs it to the control circuit 14.

The ATF circuit 21 extracts the aforementioned pilot frequency component from the digital data before demodulation supplied from the reproduction processing circuit 15, generates a tracking error signal by a known method, and outputs it to the control circuit 14. The control circuit 14 also controls the servo circuit 22 based on the tracking error signal to perform tracking control.

Next, the search operation will be described with reference to the flowchart of FIG.

The control of the search operation is all performed by the control circuit 14, and FIG. 6 is a flow chart for explaining the control operation of the control circuit 14.

When the search operation is started, first, the AT of the search target input by the search key 13d of the operation unit 13 is input.
N is stored in the memory inside the circuit (step S1) and compared with the currently reproduced ATN (step S2). As a result of the comparison, if they match each other, the normal reproducing operation is started (step S7).

If the currently reproduced ATN is smaller than the input ATN, the servo circuit 22 is controlled to convey the tape 7 in the positive direction at high speed.
Is reproduced (step S3), and when the reproduced ATN becomes the ATN immediately before the target ATN, the normal reproduction is started (step S4).

When the currently reproduced ATN is larger than the input ATN, the servo circuit 22 is controlled to convey the tape 7 in the reverse direction at high speed.
Is reproduced (step S5), and when the reproduced ATN becomes an ATN immediately after the target ATN, the normal reproduction is started (step S6).

Here, when the ATN immediately before or after the target ATN is reproduced, the normal reproduction is started because the inertia of the mechanism 23 or the like causes the track of the target ATN to be passed. This is to prevent

In this way, the track on which the desired video signal is recorded can be quickly searched using the ATN.

In the above-described embodiment, the ratio of the track pitch or the tape transport speed in the SP mode and the LP mode is 1 :.
Although described as 2/3, of course, other than this, it is possible.

For example, FIG. 7 shows a method of arranging the ATNs when these ratios are 1: 1/2, that is, when the track pitch and the tape transport speed in the LP mode are both halved in the SP mode.

In FIG. 7, the same ATN is used in the LP mode.
Is recorded for each two tracks.

By recording in this way, the continuity of the ATN before and after the insertion can be maintained even when the ratio is 1: 1/2.

Further, in the method shown in FIG. 7, if LP2 frames are recorded in SP1 frame units based on the common multiple of the pilot rotation cycle and track pitch, the pilot rotation continuity is increased. Can also be kept.

In the above-mentioned embodiment, the track pitch and tape feeding speed in the LP mode are 1 / th of those in the SP mode.
Although the case of 2 or 2/3 has been described, the present invention can be applied to other cases.

In this case, the ATN arrangement method is changed in accordance with the track pitch ratio between the SP mode and the LP mode to equalize the change amount of the ATN recorded on the same tape length. ATN continuity before and after insert recording can be maintained.

At this time, if the insert recording is performed in units of the common multiple of the track pitch ratio and the pilot rotation period, the continuity of the rotation of the pilot can be maintained.

In the above embodiment, the SP mode and L
An apparatus having two kinds of recording modes of P mode has been described, but the present invention can be applied to a configuration having three or more kinds of recording modes.

Further, in each mode, the ATNs that increase per predetermined tape transport amount are matched, so that the ATN can be represented by the same number of bits in any mode.

That is, when the ATN is incremented one by one in one track in the LP mode as in the SP mode, the number of bits of data required to record the ATN in all tracks in the LP mode. Is greater than that in the SP mode, but in the above-described embodiment, the AT recorded on the final track of the tape is
Since N is the same in any mode, it is possible to represent all ATNs in the LP mode with the same number of bits as in the SP mode.

For example, even if the ATN is recorded in the LP mode in the same recording rule as in the SP mode and 10 bits are required, it can be set to 9 bits or 8 bits according to the above embodiment. .

[0061]

As is apparent from the above description, in the present invention, track number information indicating the track number is recorded on a large number of tracks on a recording medium in a plurality of recording modes in which the recording medium is conveyed at different speeds. In this case, since the recording rule of the track numbers to be recorded is changed according to the ratio of the transport speed, the continuity of the track numbers is maintained even when the information signals recorded in different recording modes are mixed. can do.

Further, in another invention of the present application, when recording the track number information on a large number of tracks on the recording medium in a plurality of recording modes having different track pitches, the change amount of the track number with respect to a predetermined carry amount. , The track numbers can be kept continuous even when the information signals recorded in different recording modes are mixed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a digital VTR as an embodiment of the present invention.

FIG. 2 is a diagram showing a recording format by the apparatus of FIG.

FIG. 3 is a diagram for explaining an insert recording operation in the embodiment of the present invention.

FIG. 4 is a diagram showing how track numbers are arranged in the embodiment of the present invention.

FIG. 5 is a diagram showing another arrangement of track numbers in the embodiment of the present invention.

6 is a flow chart for explaining a search operation in the device of FIG.

FIG. 7 is a diagram showing another arrangement of track numbers in the embodiment of the present invention.

[Explanation of symbols]

 11 track number generation circuit 12 subcode generation circuit 14 control circuit 17 subcode reproduction circuit 18 track number detection circuit

Claims (14)

[Claims] 1. An apparatus for forming a number of tracks on a recording medium to record an information signal, the apparatus having a plurality of recording modes having different track pitches, and a conveying unit for conveying the recording medium, and the recording apparatus. Recording means for recording track number information indicating the track number on a number of tracks formed on a medium; and a change amount of the track number with respect to a predetermined carry amount of the recording medium in the plurality of recording modes. A recording device, comprising: a control unit for making them substantially coincide with each other. 2. The recording means further records a plurality of pilot signal components having different frequencies on the plurality of tracks together with the information signal by a predetermined rotation. Recording device. 3. The control means controls the recording means to perform insert recording in track units corresponding to a common multiple of the rotation cycle and the track pitch ratio between the plurality of modes. Item 2. The recording device according to item 2. 4. The information signal includes a digital video signal, and the recording means records one frame of the video signal on a predetermined number of the tracks.
The recording device according to 1. 5. In the recording mode, the control means records the same track number information for each of a plurality of tracks in the predetermined number of tracks for recording the video signal for one frame, and before and after a frame boundary. 5. A mode in which a corresponding track includes a mode of skipping the track number by a predetermined number.
The recording device according to 1. 6. The recording apparatus according to claim 5, wherein the control unit determines the number of track numbers to be skipped according to a ratio of track pitches among the plurality of recording modes. 7. The recording medium includes a magnetic tape, and the recording means has a magnetic head for forming a plurality of helical tracks on the magnetic tape to record the information signal and track number information. The recording device according to claim 1. 8. The recording apparatus according to claim 1, wherein the control unit has a table for generating the track number information for each of the plurality of recording modes. 9. The recording apparatus according to claim 1, wherein the track number indicates a number of the track from the head of the recording medium. 10. An apparatus for recording an information signal on a recording medium in a plurality of recording modes in which recording medium transport speeds are different from each other, wherein a large number of tracks are formed on the recording medium, and the track number is indicated. Recording means for recording track number information, and control means for changing the recording rule of the track numbers to be recorded on the multiple tracks by the recording means according to the ratio of the transport speed of the recording medium between the plurality of recording modes. A recording device comprising: 11. The recording device according to claim 1, further comprising: recording a plurality of pilot signal components having different frequencies on the plurality of tracks together with the information signal in a predetermined rotation. Recording device. 12. The control means changes the arrangement of the track numbers in units of the ratio of the recording medium conveying speed between the plurality of recording modes and the number of tracks corresponding to a common multiple of the rotation cycle. Claim 11
The recording device according to 1. 13. The recording apparatus according to claim 10, wherein the recording unit further records information indicating the recording mode on the recording medium. 14. In the plurality of recording modes, the track number is recorded in another recording mode according to a recording rule of the track number in the recording mode in which the recording medium conveyance speed is the highest among the plurality of recording modes. 11. The recording apparatus according to claim 10, wherein the number of bits is smaller than the required number of bits.