JPS62279582A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily retrieve a prescribed program from on the way of a magnetic tape by reading sub-information from a recording medium of a high speed travelling, deciding a ranking, counting the number of the main information of the prescribed ranking and recording it into a prescribed position. CONSTITUTION:A reproducing means 2 reproduces main information and sub- information incidental to the main information from recording medium 1 driven at a high speed by a driving means and a reading means 7 reads the sub- information from the reproducing signal outputted by the means 2. From the sub-information read by the means 7, a control circuit 8 decides the ranking of the sub-information and calculates the number of the main information at the prescribed ranking. A generating circuit 9 is controlled by the circuit 8, generates the signal concerning the number and a recording means 2 records the output signal of the circuit 9 to the prescribed position of the medium 1. Thus, the number of the program as TOC information is made coincident to the number of the program to record the program number in the correct ranking and the prescribed program can be easily retrieved from on the way of the medium 1.

Description

Detailed Description of the Invention 3. 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 number of main information items in which sub information is in a predetermined order is searched and recorded at a predetermined position on a recording medium.

[Conventional technology]

In R-DAT, which has been standardized recently, as shown in Figure 4, an audio signal digitized as main information (PCM) is placed approximately at the center of each inclined track, and at both ends (in the figure). Sub-coat signals as sub-information accompanying the main information are recorded in the shaded areas. The subcode signals include an ID code, a code related to the recording date and time, a program number (PN○) code, and the like. The program number of each program (for example, a famous song) is recorded in the subcode area of that program, and the content of the program recorded on the magnetic tape is recorded in the subcode area near the beginning of the magnetic tape. TOC (Table of Con)
tents) 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 like 2, 3, 6.7, or not in the correct order like 3, 1, 2, 3.4, the number from the start 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, including a driving means for driving a recording medium, a reproducing means for reproducing main information and sub information accompanying the main information from a recording medium driven at high speed, and a reproduction signal outputted by the reproducing means. a reading means for reading sub-information from the reading means; 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 a control circuit that is controlled by the control circuit and generates a signal related to the number. generation circuit.

The apparatus is characterized by comprising a recording means for recording the signal outputted by the generating circuit at a predetermined position on a recording medium.

[Effect]

The recording medium is run at a higher speed than during normal recording and reproduction, and the sub information is read. The order (permutation) of the sub information that is read out sequentially is determined, and the number of main information that is in a predetermined order is counted. The counted number of main information is recorded at a predetermined position.

〔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 10, and is supplied to the rotating magnetic head 2 via an amplifier circuit 11 and a rotary transformer 4.

A drive circuit 12 drives the magnetic tape 1 and the rotating drum 3.

The operation is as shown in flowchart 1 in FIG. When a predetermined input is made to the control circuit 8, the control circuit 8 outputs a control signal to the drive circuit 12, causing the rotary drum 3 to rotate at a predetermined speed, and the magnetic tape 1 to be rotated at a higher speed than during normal recording and playback. to rewind. When the magnetic tape 1 is rewound to its starting end, the control circuit 8 receives the value A.
is set to 1, and the magnetic tape 1 is fast-forwarded at high speed.

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 determines that its value is the value A.
(A=1) and if it is equal to 1, the value A
is incremented by one (A=2) and compared with the program number to be read next. This operation is continued until the read program number and the value A do not match (or until the end of the magnetic tape 1 is reached).

When the read program number and value A do not match, value A is decremented by one. As a result, the value A becomes
1.2.3... are matched with the number of programs (total number) assigned program numbers in the correct order.

Next, the control circuit 8 controls the drive circuit 12 so that the magnetic tape 1
rewind to the beginning. After rewinding to the starting end, the control circuit 8
The apparatus is set to dubbing mode, and the magnetic tape 1 is run at a normal recording speed.

At this time, the control circuit 8 outputs a control signal to the TOC signal generation circuit 9, and outputs a digital signal corresponding to the counted value A to the TOC signal generation circuit 9.
It is output to the conversion circuit 10 as an OC signal. Conversion circuit 1
0 converts this signal into an RF multiplied signal and supplies it to the rotating 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 of A (the number of programs recorded in the correct order). ) is recorded as TOC 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 end (BOT) to the end end (EOT) of 1.2.3.
If the program numbers are recorded in the correct order such as 4.5, the total number of recorded programs (5) is TO
If the number 1.2.3.6.7 and the intermediate numbers recorded as C information are missing as shown in Figure (b), the number of programs (3 ) is TOC
Recorded as information. On the other hand, as shown in Figure 3(c), if the program number does not start from 1 (3, 1, 2, 3, 4), high-speed playback is not performed and the TO
The number of programs is recorded as O as C information.

In the above description, the magnetic tape 1 is once rewound to the starting end and then reproduced at high speed (fast forward) to read out the program number, but it is also possible to read the program number during rewinding. In this case, when the program number at the start point of rewinding is N, high-speed playback is executed from the starting point only when the program number becomes N, N-1, ... 2, 1, N+1, N
The program number +2, etc. may be read out, and in other cases, the number may be immediately recorded as 0 as TOC information. In this way, the operating time can be further shortened.

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 relates to an information recording/reproducing apparatus.

A driving means for driving a recording medium, a reproducing means for reproducing main information and sub information accompanying the main information from the recording medium driven at high speed, and a reading means for reading the sub information from a reproduction signal outputted by the reproducing means. A control circuit that determines the order of the sub information read by the reading means and calculates the number of main information in a predetermined order, a generator circuit that is controlled by the control circuit and generates a signal related to the number, and an output from the generator circuit. Since the recording means for recording signals at a predetermined position on the recording medium is improved, the number of programs as TOC information in R-DAT etc. must match the number of programs whose program numbers are recorded in the correct order. This makes it easy to search for a predetermined program from the middle of the magnetic tape.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the information recording and reproducing apparatus of the present invention, and FIG.
The figure is a flowchart, FIG. 3 is an explanatory diagram of the magnetic tape, and 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] A driving means for driving a recording medium, a reproducing means for reproducing main information and sub information accompanying the main information from the recording medium driven at high speed, and reading the sub information from a reproduction signal outputted by the reproducing means. a reading means, a control circuit that determines the order of the sub information read by the reading means and calculates the number of the main information in a predetermined order, and is controlled by the control circuit and generates a signal related to the number. An information recording/reproducing apparatus comprising: a generating circuit; and recording means for recording the signal output from the generating circuit at a predetermined position on the recording medium.