JPS6346604A - Sub code rewrite method in magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To surely rewrite sub code information by a minimized tape running and minimized memory capacity by reading 1st sub code information recorded on a 1st sub code area, revising part of the information and writing it on a 2nd sub code area as 2nd sub code information. CONSTITUTION:The 1st sub code information A recorded on the 1st sub code area SUB-1 in the 1st and 2nd sub code areas SUB-1, SUB-2 provided on the same track is read and stored in a memory as a data A. Further, while the head reaches the 2nd sub code area SUB-2 provided on the same track, a data A' revised partly based on the data A is stored in the memory as the 2nd sub code information A'. Then when the head reaches the 2nd sub code area SUB-2, the data A' as the end sub code information stored in the memory 7 is read and subjected to post-recording on the 2nd sub code area SUB-2.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention records PCM data by forming one diagonal track on a recording medium every unit time using a rotating head. The present invention relates to a reproducing method, and particularly to a subcode rewriting method in a magnetic recording/reproducing apparatus in which a subcode recorded in a subcode area formed for each track is rewritten.

[Technical background of the invention and its problems] As an example of this type of device, the one shown in FIG. 1, which is an embodiment to which the present invention is applied, has been considered.

In the figure, 1 is a tape as a recording medium, and two heads 2a and 2b are wound around the circumferential surface of a drum 3 arranged at an angular interval of 180°, for example, in an angular range of 90°. The heads 2a and 2 run together with the rotation of the head 3.
b, signals are recorded on diagonal tracks alternately one after another. Reference numeral 4 denotes a non-contact type rotary transformer, which supplies the reproduction signal picked up by the heads 2a and 2b to the reproduction amplifier 5 during reproduction, and supplies the recording signal from the recording amplifier 8 to the heads 2a and 2b during recording. It is. 6 and 9 are RF signal converters, 7 is a memory composed of RAM, and 10 is a control unit.

Figure 2 shows the tape pattern, with ATF for tracking on both sides of the PCM data.
There is a signal area, and on both sides outside of that there is a subcode area (SUB-1, 5) for recording AUX data.
UB-2) is provided. The same information is normally recorded in the first and second sub-court areas 5UB-1 and 5OB-2.

Each of the above signals is provided with a PLL area for synchronization, and there is a gap between each signal so that each signal can be recorded independently.

Next, a subcode rewriting method in the above configuration will be explained.

When the control section 10 is set to the subcode rewriting mode by a signal from an operating means (not shown), the mechanism enters a normal running state according to a command from the control section 10. and,
Playback is performed from the operation starting point shown in FIG.
The subcode information recorded in the subcode area provided for each track as the head 2a runs,
2b, a low retransformer 4, a reproduction amplifier 5, and an RF signal converter 6, the subcodes are sequentially read track by track, and the sequentially read subcodes are sequentially stored in the memory 7 as data.

When a predetermined rewriting section on the tape 1 ends, the control section 10 puts the mechanism into the rewinding state and rewinds the tape 1 to the above-mentioned operation start point. And tape 1
When the mechanism has been rewound to its starting point, the control section 10 then puts the mechanism into an after-recording state.

Next, based on the data stored in the memory 7 described above, data that is partially modified is written into the subcode area on the tape 1 from the starting point of the operation again. That is, partially changed data is sequentially read out from the memory 7 and sent to the heads 2a and 2b via the RF signal converter 9, the recording amplifier 8, and the rotary transformer 4.
As the tape 1 runs, writing is sequentially performed in the subcode area provided for each track.

Note that when the after-recording is performed as described above and the rewriting section shown in FIG. 5 is completed, the control unit 1
0 puts the mechanism in a stopped state and cancels the subcode rewriting mode set by the operating means.

FIG. 6 is a flowchart showing the operation when rewriting the subcode described above.

When the control unit 10 is set to the subcode rewriting mode by the operating means, the control unit 10 puts the mechanism in a normal running state in step S1.

Then, in step S2, it is determined whether the pattern on the tape is the first subcode area 5tJB-1 shown in FIG. 1st subcode area 5U
If it is B-1, the subcode information recorded in the corresponding area is read in step S3, and if not, the process returns to the above-described determination in step S2. Step S above,
The subcode information of the first subcode area 5UB-1 read in step S4 is written to the memory 7 including the track number, and then in step S4.

Data changes are made in .

Next, in step Sh, it is determined whether the rewriting section has ended or not. If it has ended, the control section 10 sets the mechanism to the rewinding state in step S7, and if it has not ended, the steps S2 to S, The operations up to this point will be repeated until the end of the rewriting section. It is determined in step S8 whether or not the rewinding in step S has been performed up to the operation start point shown in FIG. When rewinding has been performed, the control section 10 switches the mechanism back to the normal running state in step S to enter the after-recording state.

First, step S. It is determined whether the track is the start track or not, and if so, the first subcode area 5UB-1 is subsequently determined in step Sll.
A judgment is made as to whether or not. If it is the first subcode area 5UB-1, data is read from the memory 7 in step S1□, and this data is stored in the step S1□.
13, it is written into the first subcode area 5UB-1. Further, in step S+a, it is determined whether or not the second subcode area 5UB-2 is located, and if so, data is read from the memory 7 in step SIS, and this data is transferred to the second subcode area 5UB-2 in step sea. 5UB-2. The above operation is repeated for the entire rewrite section, and it is determined in step Sl? whether the rewrite section has ended or not. Judgment will be made. Then, when it is determined in step S17 that the rewriting section has ended, the control unit 10 stops the mechanism in step SI8, cancels the subcode rewriting mode, and performs a series of rewriting operations in the entire predetermined rewriting section. Ends subcode rewriting operation.

However, the above subcode rewriting method requires a large capacity memory to temporarily store the original subcode information in the section on the tape that is desired to be rewritten. It is also necessary to store the track number on the tape where the original subcode information existed. Furthermore, since there is a practical limit to memory capacity, when rewriting a long section on a tape, it is necessary to
As shown in the figure, it is necessary to repeat the above operations for each small section, and running the tape multiple times (repeating playback, rewinding, and after-recording) makes the operation complicated and increases the operating time. There was a problem.

[Purpose of the invention]

The present invention has been made in order to eliminate the problems of the conventional methods described above, and it rewrites subcode information reliably according to the format on the tape with a minimum memory capacity and a minimum tape running operation. It is an object of the present invention to provide a method for rewriting subcodes in a magnetic recording/reproducing device.

[Summary of the invention]

In the present invention, first, over the entire rewriting interval,
The first tape provided on the tape track. The first subcode information recorded in the first subcode area 5UB-1 of the second subcode area is read, and a part of the read first subcode information is changed. as the second subcode information in the second subcode area S.
, writes to U B -2.

Next, the tape running direction and the drum rotation direction (head rotation direction) are reversed from the above, and the second subcode information recorded in the second subcode area SUB 2 on the tape track is read. , by writing information equivalent to this read information into the first subcode area SUB-1 as third subcode information,
One tape running operation is required even for a long rewriting section, and the first . The subcode information recorded in the second subcode areas 5UB-1 and 5UB-2 can be rewritten.

〔Example〕

An embodiment of the present invention will be described below, but since the configuration shown in FIG. 1 is the same as described above, the explanation thereof will be omitted.

When the control unit 10 is set to the subcode rewriting mode by the operating means, the mechanism enters a normal running state in response to a command from the control unit 10. As shown in FIG. 3(a), the first. Among the second subcode areas 5UB-1 and 5OB-2, the first subcode information “A” recorded in the first subcode area 5UB-1 is read, and this is stored in the memory 7 as data “A”. ”. Furthermore, before the head reaches the second subcode area 5UB-2 provided on the same track, data "A'", which is partially modified based on the above data "A", is Second subcode information “
Then, when the head reaches the second subcode area 5UB-2, the data "A'" stored in the memory 7 is stored in the memory 7 as the second subcode information. ''' is read out and after-recorded in the second subcode area 5UB-2.

From this point on, as the tape 1 runs, the first subcode area 5UB-1 to the first
The subcode information is read, stored in the memo U7, the data is changed, and the changed data is later recorded as second subcode information to the second subcode room rear SUB-'2. repeated sequentially.

When all of the above-described operations are completed over the entire rewriting section, the control unit 10 reverses the running direction of the tape 1 and the rotating direction of the drum 3, and controls the mechanism to perform after-recording in the opposite direction to the above-mentioned direction. .

After this, as shown in FIG. 3(b), the second subcode information "A'" recorded in the second subcode area 5UB-2 on the trunk is read and stored in the memory 7 as data "A'". A′”, and information equivalent to this second subcode information “A′” is stored as third subcode information “A”.
, tape 1 to the first subcode area 5UB-1.
After-recording will be done for each track as it runs. When all the above-mentioned operations are completed over the entire rewriting section, the control section 10 stops the mechanism, cancels the subcode rewriting mode, and ends the series of subcode rewriting operations described above.

In the above-described series of operations, in the normal running direction, first, the first subcode information "A" recorded in the first subcode area 5UB-1 is read as shown in FIG. 3(a). , after-recording the second subcode information "A'" with this information partially changed to the second subcode area 5UB-2 on the same trunk, and repeating the above operation over the entire rewriting section. I will do it. When the rewriting section is completed, the tape running direction and the drum rotation direction are reversed from the above, and the next operation is repeated in the reverse running direction over the entire rewriting section.

That is, this time, as shown in FIG. 13 (bl), the second subcode information "A'" recorded in the second subcode area 5UB-2 is read, and this second subcode information "A" The third subcode information "A'" equivalent to "A'" is sequentially after-recorded to the first subcode area 5UB-1 on the same track. subcode area 5 of
The subcode information written to UB-1゜5UB-2 is the same information.

FIG. 4 is a flowchart showing the operation at the time of rewriting the above-mentioned subcode according to the present invention.

When the control unit 10 is set to the subcode rewriting mode by the operating means, the control unit 10 puts the mechanism in a normal running state in step Sl.

At this time, the drum motor that rotationally drives the drum 3 on which the heads 2a and 2b are disposed rotates in the forward direction, and the capstan motor that drives the tape 1 to run also rotates in the forward direction, driving the tape 1 in the normal running direction. .

Then, in step S2, it is determined whether the pattern on the tape is the first subcode area 5UB-1, and if so, the first subcode area 5UB-1 is reproduced in step S. Then, the first subcode information “A” recorded here is read,
This information is written to the memory 7 as data "A" in step S4. Next, while reaching the second subcode area 5UB-2 on the same track, step S,
A part of the data is changed based on the above data “A”, and this data is changed to the second subcode information “A”.
'''. Thereafter, in step S6, it is determined whether or not the second subcode area 5UB-2 is the second subcode area 5UB-2.
If it is UB-2, the above-described second subcode information "A" is read out from the memory 7 in step S7, and this information is stored in the second subcode area 5U in step S8.
Written to B-2.

The operations from steps S2 to 88 described above are repeated over the entire rewrite period, and in step S, it is determined whether the rewrite period has ended.

Then, when it is determined that the above-described operation has been completed over the entire rewriting section, the control section 1o sets the mechanism to the reverse traveling state in step 310. At this time, the drum motor and the capstan motor are driven to rotate in the opposite direction to that described above, the drum 3 on which the heads 2a and 2b are disposed is rotated in the opposite direction, and the tape 1 is driven in the reverse running direction. .

In the reverse running state, first step S.

Based on the smell, it is determined whether it is the second subcode area 5UB-2 provided on the track, and if so, in step S+Z the second subcode area 5UB-2 is located on the track.
-2 is reproduced, and the second subcode information "A" recorded therein is read. This read second subcode information "A'" is written to the memory 7 as third subcode information in step SI3. Then,
In step 514, it is determined whether the subcode area 5UB-1 is the first subcode area 5UB-1 provided on the same trunk, and if so, in step SIs, the memo I77
Then, third subcode information "A'" which is equivalent to the second subcode information "A'" described above is read out, and this third subcode information "A/m" is read out from the first subcode information "A'" in step S16. It is written to area 5UB-1.

The operations from steps S11 to 80 described above are repeated over the entire rewrite section, and step S+? At , it is determined whether the rewriting period has ended.

When it is determined that the above operation has been completed over the entire rewriting section, the control unit 1o stops the mechanism in step Sll+, cancels the subcode rewriting mode, and rewrites the series of subcodes described above. Finish the operation.

In the above-described embodiment, the subcode information is read and rewritten in the normal running state, and the subcode information is written in the reverse running state to write the subcode information in the first track on the same track. Second subcode area 5UB-1, 5U
Although the example in which the subcode information is unified in B-2 has been described, the same effect can be obtained even if processing is performed in a form in which these relationships are reversed.

Further, in the above-described embodiment, the subcode information to be handled was not specified, but the following application examples can be considered as the subcode information.

■Additional recording of absolute time to a recorded tape.

■Rearrange the program numbers on the recorded tape.

■Delete the recorded shortening identification information.

〔effect〕

As explained above, according to the present invention, the first . The first subcode information recorded in the first subcode area of the two second subcode areas is read, and a part of this read information is changed to become the second subcode information. , this second subcode information is written in a second subcode area on the same track, and this is continuously performed until the end of a predetermined rewriting section. Next, the running direction of the tape and the rotating direction of the drum are reversed, the above-mentioned second sub-code information recorded in the second sub-code area on the above-mentioned track is read, and information equivalent to this information is transferred to the third sub-code area. The subcode information is written in the first subcode area on the same track, and the subcodes are rewritten on the tape sequentially according to the tape format.
There is no need for a large capacity memory, there is no need to store a trunk number indicating the position on the tape, and rewriting over a long section on the tape can be done in one tape running operation.

Therefore, subcodes can be rewritten according to the tape format with a minimum memory capacity and a minimum tape running operation, and subcode information within the same track can be rewritten reliably.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an apparatus to which the present invention is applied, Fig. 2 is a diagram showing a tape pattern in an apparatus to which the present invention is applied, and Fig. 3 (al and bl are concepts for explaining the present invention). 4 is a flowchart for explaining the subcode rewriting method according to the present invention, FIG. 5 is a conceptual diagram showing the conventional operation, and FIG. 6 is a flowchart showing the conventional subcode rewriting method. ■...Tape, 2a, 2b...Head, 3...Drum, 7...Memory, 10...Control unit, 5UB-1
...first subcode area, 5UB-2...second
subcode area. Patent applicant: Pioneer Corporation, Figure 2, Figure 3, Figure 6

Claims (3)

[Claims] (1) One diagonal track is sequentially formed on the recording medium by a rotating head every unit time, and subcode information is recorded in the first and second subcode areas formed on each track. In the subcode rewriting method, the first subcode information recorded in the first subcode area of the first and second subcode areas is read, and the first subcode information recorded in the first subcode area is read. In a magnetic recording and reproducing apparatus, the information obtained by changing a part of the subcode information is written as second subcode information in a second subcode area formed on the same track. How to rewrite subcode. (2) One diagonal track is sequentially formed on the recording medium by a rotating head every unit time, and subcode information is recorded in the first and second subcode areas formed on each track. In the subcode rewriting method, the second subcode information recorded in the second subcode area is read, and information equivalent to the read second subcode information is transferred to the third subcode area. A subcode rewriting method in a magnetic recording/reproducing apparatus, characterized in that subcode information is written in a first subcode area formed on the same track. (3) The tape running direction and the drum rotation direction in the above item (1) are opposite to the tape running direction and the drum rotation direction in the above item (2). ) and (2), a subcode rewriting method in a magnetic recording/reproducing device.