JPS6344387A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To calculate programs in a short time in the middle of a magnetic tape by driving a recording medium in the reverse direction and deciding the sequence when the number of information on right sequences reach a prescribed value before a magnetic tape reaches the end of a recording medium. CONSTITUTION:When a review starts in the middle of a program number 1 or 2, the magnetic tape 1 is rewound to a start point BOT, where a flag F is set to '1'. Afterwards, when a tailing end EOT is queued, the number of a final program is calculated as a total N. If the review starts in the middle of a program 3, a travel direction is inverted the moment the program number 2 is detected. Then a queuing action is executed. When the tape reaches the EOT, the flag F is set to '1', and again the review starts. The number of a program initially read by the review is set as the total N.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording/reproducing device typified by R-DAT.

[Summary of the invention]

In the present invention, the recording medium is driven in the first direction, the order of the sub information is determined a predetermined number of times, and the direction in which the recording medium is further driven is selected in accordance with the determination result.

[Conventional technology]

In R-DAT, which has been standardized recently.

As shown in Figure 4, the main information is a digitized (PCM) audio signal approximately at the center of each inclined track, and the sub-information accompanying the main information is placed at both ends (shaded areas in the figure). Each subcode signal as information is recorded. Subcode signals include ID code, code related to recording date and time, and program number (PN○)
There are codes etc. and each program (e.g. each)
The program number of the program is recorded in the subcode area of the magnetic tape, but the subcode area near the beginning of the magnetic tape contains the TOC (T a b 1e
of Contents) information is recorded.

[Problem that the invention seeks to solve]

For example, when recording the number (total number) of programs recorded on a magnetic tape as TOC information, it is conceivable to fast forward or rewind the magnetic tape, read the subcode, and count the number of programs. However, simply counting and recording the number of programs in this way does not allow the program numbers to vary, for example, from the beginning of the magnetic tape to 1.
If it is recorded with missing numbers as in 2.3.6.7, or in an incorrect order as in 3.1.2.3.4, the It becomes difficult to search for a predetermined song from the middle of the magnetic tape by specifying whether it is a song or not.

[Means for solving problems]

The present invention provides an information recording and reproducing apparatus, which includes a driving means for driving a recording medium, a reproducing means for reproducing at least sub information accompanying main information from the recording medium driven at high speed, and a sub information from a reproduction signal outputted by the reproducing means. comprising a reading means for reading information, and a control circuit for determining the order of the sub information read by the reading means and calculating the number of main information in a predetermined order,
The recording medium is first driven in a first direction to determine the ranking, and when the number of main information items in the correct ranking reaches a predetermined value before reaching the end of the recording medium, the recording medium is driven in the opposite direction to the first direction. The recording medium is driven in the second direction to determine the ranking.

[Effect]

The recording medium is first run in the first direction at a higher speed than during normal recording and reproduction, and the sub information is read. The order (order) of the sub information that is read sequentially is determined, and the number of main information that is in a predetermined order is counted. When this number reaches a predetermined value, the recording medium is run in the second direction.

〔Example〕

FIG. 1 is a block diagram when the information recording/reproducing apparatus of the present invention is applied to an R-DAT. In the figure, reference numeral 1 denotes a magnetic tape as a recording medium, which is wound around a rotating drum 3 having a rotating magnetic head 2 by approximately 9 degrees. A rotary transformer 4 transmits the signal from the rotating magnetic head 2 to the amplifier circuit 5.

A conversion circuit 6 demodulates the RF multiplied signal supplied from the amplifier circuit 5 and converts it into a digital signal.

A reading circuit 7 reads a subcode signal from the signal input from the conversion circuit 6 and outputs the read value to a control circuit 8 such as a microcomputer. 9 is TO
This is a C signal generation circuit, which is controlled by the control circuit 8 and outputs a predetermined TOC signal. This TOC signal is converted into an RF signal by a conversion circuit 1o, and is supplied to the rotating magnetic head 2 via an amplifier circuit 11 and a rotary transformer 4.

Reference numeral 12 designates a drive circuit 6 for driving the magnetic tape 1 and the rotating drum 3.The operation thereof is shown in the flowchart of FIG. When a predetermined input is made to the control circuit 8, the control circuit 8
sets flag F and flag P to O, and executes review (rewind playback) mode processing. In review mode processing, the value C and the value A are each 1.
After being set to .

A review operation is performed. That is, the control circuit 8 outputs a control signal to the drive circuit 12 to rotate the rotary drum 3 at a predetermined speed and rewind the magnetic tape 1 at a higher speed than during normal recording and reproduction.

At this time, a reproduction signal outputted from a rotary magnetic head 2 serving as reproduction means is inputted to a conversion circuit 6 via a rotary transformer 4 and an amplifier circuit 5. The conversion circuit 6 receives the input R
The signal is demodulated into an F-fold digital signal and output to the reading circuit 7. The reading circuit 7 reads the reproduced digital signal and reads out the program number (PNO) from it. When the program number is read, the control circuit 8 sets the flag P to 1 and the program number is set to the value A (A=1
) is equal to or not.

If the program number and value A are not equal, value A is set equal to the program number. Next, it is determined whether or not the value C is equal to 1. If the value C is equal, 1 is added to the value C, and if the value C is not equal to 1, the flag F is set to 1. That is, the value C is set to 2 (≠1) when the value A does not match the read program number, and the flag F is set to 2 (≠1) when the last search is entered (when the total number N of programs in the correct order can be determined by the search). ) is set to 1.

Then, as soon as the flag F is not 1, when it is 1, the value N is set equal to the value A, after which the value A is decreased by 1 and the process returns to the program number reading step again. If the read program number and value A are equal, value A is 1.
When it is equal to , the value A is decremented by one and the reading of the primary program number is waited.

If the value A is not 1, when the value F is 1, decrease the value A by 1, wait for reading the next program number, and then set the value F to 1.
If not, the process shifts to cue (fast-forward playback) mode processing.

When the end of the magnetic tape 1 is detected by means not shown in the step of waiting for the next program number to be read, a tape end interrupt process is performed. In this case, it is determined whether the end of the optical string is the beginning of winding (starting end), and if it is the beginning, the immediately previous mode is determined. If the previous mode is review mode, flag P is 1.
(when the program number is being read) Then it is determined whether the value A is O or not. If the value A is not O, that is, if the program number recorded at the beginning of the magnetic tape 1 is not 1, the value N is set to 0, and then the process shifts to post-recording mode processing.

If the value A is 0 and the flag F is 1, the process shifts to an after-recording mode process in order to record the value N at that time as TOC information. Flag P is not 1 (the program number has not been read), or flag F is 1.
If not (not the last search), flag F
After is set to 1, the process shifts to queue mode processing.

If the end of magnetic tape 1 is the end (not the start), if flag F is not 1, it is set to 1 and review mode processing is performed, and if it is 1, value N decreases value A by one. After the value is set to the specified value, rewind processing is performed.

In the queue mode process, it is first determined whether the flag F is 1, and if it is not 1, immediately, and if it is 1, the value A is set to 1, and then the queue mode operation is executed. At this time, the control circuit 8 outputs a control signal to the drive circuit 12, reverses the running direction of the magnetic tape 1, and causes the magnetic tape 1 to run at high speed (fast-forward) toward the terminal end.

In this state, the program number is read.

It is compared with the value A. If the read program number is equal to the value A, the value A is incremented by one, and then the next program number is read. The read program number is value A
If the value N is not equal to the value A, a value obtained by decreasing the value A by 1 is set as the value N. Next, it is determined whether flag F is 1, and if it is 1, the process moves to rewind mode processing,
If it is not 1, flag F is set to 1 and then review mode processing is performed.

In rewind mode processing, the control circuit 8 is connected to the drive circuit 1.
2 to rewind the magnetic tape 1 to the starting end. After rewinding to the start end, the control circuit 8 sets the apparatus to an after-recording mode, and runs the magnetic tape 1 toward the end end at a normal recording speed. At this time, the control circuit 8 outputs a control signal to the TOC signal generation circuit 9, and causes the conversion circuit 10 to output a digital signal corresponding to the calculated value N as a TOC signal. The conversion circuit 10 converts this signal into an RF signal and supplies it to the rotary magnetic head 2 as a recording means via the amplifier circuit 11 and the rotary transformer 4.

The rotating magnetic head 2 is connected to the reproduction system when facing the audio signal area, but is connected to the recording system when facing the subcode area, and has a value N (the number of programs recorded in the correct order). ) is recorded as T○C information.

When writing of the TOC information is completed, the control circuit 8 controls the drive circuit 12 to rewind the magnetic tape 1 to the starting end.

Therefore, for example, as shown in FIG. 3(a), the magnetic tape 1
From the start (BoT) to the end (EOT) of 1.2.3.
...If the program numbers are recorded in the correct order of 8 and 9, the total number of recorded programs (9) is recorded as TOC information.

In this case, as shown in (al) to (a3) of the same figure, the BO
Near T, in the middle of program number 1 or program number 2
When a search (review) is started in the middle of , magnetic tape 1 is rewound to BOT, where flag F
is set to 1. After that, when searching (queuing) up to EOT, the last program number is calculated as the total number N. Further, as shown in FIG. 4 (C4), when the review is started from the middle of program number 3, when program number 2 is detected, the traveling direction is reversed and the cue operation is executed. When the EOT is reached, flag F is set to 1 and review is started again.

The program number read first by this review is set as the total number N.

In this example, the first review is read at one time.
When it is confirmed that the three different program numbers are in the correct order, the system shifts to the cue mode (however, if the program number read immediately before is 1, the review operation continues as it is). It is possible to determine whether the sequence is correct by reading at least two program numbers, but it is of course possible to increase the number.

On the other hand, as shown in FIG. 3(b), 1.2.3..., 7.
If the numbers in the middle such as 10, 11, 12 are missing,
The number of programs (7) immediately before the program is lost is recorded as ToC information.

In this case as well, as shown in (bl) to (b,) of the same figure, B
When the review is started in the vicinity of OT, in the middle of program number 1, or in the middle of program number 2, the magnetic tape 1 is rewound once to BOT, but as shown in the same figure (b4), the review is started from the middle of program number 3. When review is started, the running direction is reversed when program number 2 is detected. In either case, when a disorder in the order is detected.

The previous program number is taken as the total number N.

If the review is started from the middle of program number 10 as shown in FIG. It is considered N. The same figure (b
, ), when the review is started in the middle of program number 11, when program number 10 is detected, the process shifts to cue operation and the search is performed until EOT. At EOT, the flag F is set to 1, and in the subsequent review, the value N is temporarily set to the value 12, but is updated to its tangent value 7.

On the other hand, as shown in FIG. 3(c), 2.1.2.3,...
- If the program number does not start from 1, such as 8 or 9, the number of the program is recorded as O as the TOC information. As shown in the same figure (C2), when a review is started near the BOT, the flag F is set to 1 in the BOT, and in the subsequent queue operation, it is detected that the first program number is 2 (not 1). When
The total number N is assumed to be O. As shown in (C2) and (C1) in the same figure, if the review is started in the middle of program number 2 or in the middle of program number 1, BOT is detected before flag F is set, so the total number N
is confirmed to be O. As shown in the same figure (C4), when the review is started from the middle of the third program, program number 2, program number 2 is detected before BOT is detected after program number 1. Therefore, at this time, flag F is set to 1 and value N is set to 2. However, since BOT is subsequently detected, the value N is updated to 0 at this time. As shown in FIG. 3 (C3), when the review is started from program number 3, when program number 2 is detected, the process shifts to cue operation, and flag F is set at EOT. In the subsequent review, the value N is temporarily set to 9, but
It is updated to the value 2 when the first program number 2 is detected, and further updated to O when BOT is detected.

As shown in FIG. 3(d), the first program number starts from 1, but if 1 is also recorded as the second program number, the value N is set to 1. As shown in (dl) to (d) in the same figure, if the review is started near the BOT or in the middle of the first or next program number 1, flag F is set in the BOT,
When the second program number 1 is detected during cue operation, the value N is set to 1. As shown in the same figure (d4), when the review is started from the middle of program number 2, the first program number 1 (closest to BOT) is detected before BOT is detected after program number 1. Therefore, at this time, flag F is set to 1,
and the value N is set to 1.

As shown in FIG. 3(d), when the review is started from the middle of program number 3, the process shifts to cue operation when program number 2 is detected, and flag F is set at EOT. In subsequent reviews, the value N is set to 9 corresponding to the first detected program number, but is updated to 1 when program number 1 is detected last.

The present invention can be applied not only to R-DAT but also to other information recording and reproducing apparatuses such as 8 mm video tape recorders.

〔effect〕

As described above, the present invention provides an information recording and reproducing apparatus including a driving means for driving a recording medium, a reproducing means for reproducing at least sub information accompanying main information from the recording medium driven at high speed, and a reproducing means output by the reproducing means. It is equipped with a reading means for reading sub information from a signal, and a control circuit for determining the order of the sub information read by the reading means and calculating the number of main information in a predetermined order, and first moving the recording medium in a first direction. When the number of main information items in the correct order reaches a predetermined value before reaching the end of the recording medium, the recording medium is moved in a second direction opposite to the first direction. Since the order is determined by driving, the number of programs recorded in the correct order on an R-DAT or the like can be calculated in a short time from the middle of the magnetic tape.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the information recording and reproducing apparatus of the present invention, and FIG.
The figure is a flowchart, and Figure 3 is an explanatory diagram of its operation.
FIG. 4 is an explanatory diagram of the R-DAT magnetic tape. 1...Magnetic tape 2...Rotating magnetic head 3...Rotating drum 4...Rotary transformer 6/conversion circuit 7...Reading circuit 8...Control circuit 9...TOC signal generation Circuit 10...conversion circuit 12...driver circuit or higher

Claims (1)

[Claims] Driving means for driving a recording medium; reproducing means for reproducing at least sub information accompanying main information from the recording medium driven at high speed; comprising a reading means for reading information, and a control circuit for determining the order of the sub-information read by the reading means and calculating the number of the main information in a predetermined order, and first moving the recording medium in a first direction. When the number of the main information in the correct order reaches a predetermined value before reaching the end of the recording medium, the second direction in the opposite direction to the first direction is determined. An information recording and reproducing apparatus characterized in that the order is determined by driving the recording medium in the direction of .