JPS59195390A - Recording and reproducing method for data group name of magnetic tape - Google Patents

Abstract

PURPOSE:To reproduce quickly the names of all data groups at any place of a tape by recording these data names at each non-recorded part between data groups with a head of a prescribed azimuth angle. CONSTITUTION:A record/reproduction head 5 is provided, and a record/reproduction head 6 has a prescribed azimuth angle to the head 5. Data groups A1-An are recorded on a magnetic tape 10 by the head 5 together with non-recorded parts B1-Bn formed respectively. A rewind/reproduction mode is set after the recording is through with the data group An. The head 5 detects the part Bn and then a data group An-1. When the termination of the group An-1 is detected, a record mode is set. Then the head 6 records the code signal of the data group name at the part Bn. This operation is repeated until the recording is through with the part B1 to record the code signals to the parts B1-Bn. When the code signal is reproduced, a rewind/reproduction mode is set. The head 5 detects a non-recorded part of the nearest position. At the same time, a reproduction mode is set to reproduce the code signal by the head 6. The group name can also be recorded on the recording tracks divided by the head with opposite phases to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a data group of a magnetic tape in which code signals of all names of data groups recorded on a magnetic tape are collectively recorded and reproduced in unrecorded areas between the data groups. Concerning a name recording and reproducing method.

Conventional configurations and their problems In recent years, there has been a demand for a function that can quickly grasp the contents of a plurality of data groups recorded on a magnetic tape.

A conventional method for recording data group name recording angles on a magnetic tape will be described below.

FIG. 1 is a schematic diagram of a recording track in a conventional magnetic tape data group name recording and reproducing method, in which 8.~A is a data group recorded on the magnetic tape, B1 is a name recording section of the data group, and C -C is the start and end of the magnetic tape. As shown in Fig. 1, the conventional method was to record a signal encoding the names of multiple data groups recorded on a magnetic tape only in the section B1 following the starting end C1 of the magnetic tape. .

However, this recording method has the problem that it is necessary to rewind the magnetic tape to the beginning in order to reproduce the code signal, and the signal cannot be reproduced quickly. Ta.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a data group name for a magnetic tape that can quickly reproduce code signals of all names of data groups recorded from any position on the magnetic tape. The purpose is to provide a recording and playback method.

Structure of the Invention The present invention inputs all the names of data groups recorded on a magnetic tape as a character string, converts this character string into a code signal, and detects each unrecorded portion formed between the data groups. a recording method for recording the code signal in each non-recording section of and;
There is a method for recording and reproducing a data group name on a magnetic tape by detecting the unrecorded portion, generating the code signal, and converting the code signal into a character string. The code signal is transferred to a head having a predetermined azimuth angle or to one recording track. By recording with a head that is divided into two parts, it is possible to quickly reproduce the above code signal, and furthermore, the output when reproduced with a well-known head can be reduced to almost 0, so that there is no recording isometrically possible. It can be kept as a section.

DESCRIPTION OF THE EMBODIMENTS FIG. 2 is a block diagram of the main parts of an apparatus for realizing a method for recording and reproducing data group names on a magnetic tape in an embodiment of the present invention, and FIG. 3 is a schematic diagram of recording tracks.

In FIG. 2, numeral 1 is a keyboard for inputting the entire name of a data group. A conversion circuit 2 converts a character string input from the keyboard 1 via the control circuit 3 into a code signal, which converts the code signal into a character string when playing back a magnetic tape. 3 is a control circuit that controls the operation of each circuit and device in this embodiment. 4 is a display device for the above character string, 5 is a well-known recording/reproducing head, 6 is a recording/reproducing head having a predetermined azimuth angle with respect to the head 6, or a recording/reproducing head having one recording track divided into two; is a well-known way to eliminate. 8 is a well-known magnetic tape running mechanism, 9 is a well-known recording/reproducing circuit, and 10 is a magnetic tape.

In FIG. 3, 8 to An are the data groups recorded on the magnetic tape, B1 to Bn are the code signal recording sections, and C1.
C2 is the start and end of the magnetic tape.

The operation of the magnetic tape data group name recording and reproducing method of the present embodiment configured as described above will be described below.

As shown in FIG. 3, the magnetic tape 10 used in this embodiment has data groups A1 to A8 by the groove 6. are recorded, and unrecorded portions B1 to Bn are formed between the "-" data groups in which all names of the data groups can be recorded. Note that the magnetic tape is at the position where recording of the data group An has ended.

First, the name of each data group is input into the keyboard 1 as a character string. Next, this character string is converted into a code signal by the conversion circuit 2 via the control circuit 3 and held. Next, the control circuit 3 puts the magnetic tape running mechanism 8 into a rewind playback operation mode, and the playback output signal from the head 6 causes the unrecorded portion Bn to be
is detected, and data group An-1 is detected. This data group A
When n-1 is detected, the control circuit 3 sets the magnetic tape running mechanism 8 to the playback operation mode, and when the end of the data group An-1 is detected by the playback output signal of the head 5, the control circuit 3 sets the magnetic tape running mechanism 8 to the playback operation mode. Enter recording operation mode,
The code signal is recorded in the non-recording section Bn by the throat 6. Next, at the same time as the recording of the code signal is completed, the control circuit 3 sets the magnetic tape traveling mechanism 8 to a rewinding/reproducing operation mode. By sequentially repeating such operations until the end of recording on the non-recording portion B1, the code signal can be recorded on the non-recording portions B1 to Bn formed on the magnetic tape 10. Note that the head 6 for recording the code signal is used for recording and reproducing the data group.1. Since the structure has a predetermined azimuth angle with respect to the mud, data groups A1 to A8. Between the recorded signal and the code signal, the output of the code signal becomes almost O due to azimuth loss and is not reproduced.

It is assumed that heads 5 and 6 are not used at the same time.

The operation of detecting, reproducing, and displaying the above-mentioned J: code signal recorded on the magnetic tape 10 using the method described above will now be described.

Immediately, the control circuit 3 puts the magnetic tape running mechanism 8 into the rewind playback operation mode, detects the unrecorded area at the shortest position using the playback output signal of the head 5, and detects the data group. Set the traveling mechanism to the regeneration operation mode, regenerate the above code signal to the head 6,
This reproduced signal is converted into a character string by a conversion circuit 2 and displayed on a display device 4 via a control circuit 3.

According to this embodiment as described above, the data group name is recorded in each unrecorded part between the data groups using a head having a predetermined azimuth angle, so that the contents of the data group recorded on the magnetic tape can be quickly read. Since the output becomes almost 0 due to azimuth loss, it is compatible even with the head and throat where the azimuth angle is not inclined.

In this embodiment, the name of the data group is recorded using a head with an inclined azimuth angle.
The data may be recorded on two recording tracks in mutually opposite phases. In this case, it is not necessary to use two heads for recording and reproducing the data group and recording and reproducing the name of the data group, and the recording and reproducing can be performed with one head.

Effects of the Invention According to the present invention, by recording the code signal of the name of the data group in each unrecorded portion between the data groups, it is possible to quickly search and reproduce the upstream code signal.

Still, the above code signal is attached to each of the above unrecorded hearts with a head having a predetermined azimuth angle or one recording track.
This is an excellent method for recording and reproducing data group names on a magnetic tape, which allows the output to be approximately Q when reproducing using a known head by recording with a head divided into two parts.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a recording track in a conventional magnetic tape data group name recording and reproducing method, and FIG. 2 is a main part of an apparatus for realizing the magnetic tape data group name recording and reproducing force method according to an embodiment of the present invention. The block diagram, FIG. 3, is a schematic diagram of recording tracks of the magnetic tape used in the present invention. 1... Keyboard, 2... Conversion circuit,
3... control 1i141 circuit, 4... display device,
5... head for recording and reproducing theta group, 6... head for recording and reproducing the name of the data group having a predetermined azimuth angle, 7
・ ・Erasing head, 8... Magnetic tape running mechanism, 9... Recording and reproducing circuit, 10... Magnetic tape.

Claims (3)

[Claims] (1) Input all the names of the data groups recorded on the magnetic tape as a character string, convert this character string into a code signal, detect each unrecorded part formed between the data groups, and generate the code signal. A data group of a magnetic tape, characterized by a recording method of recording in each unrecorded part, and a reproduction method of detecting the unrecorded part, reproducing the code signal, and converting the code signal into a character string. Name recording angle raw method. (2) A method for recording and reproducing data group names on a magnetic tape according to claim 1, wherein the code signal is recorded and reproduced by a head having a predetermined azimuth angle. (3) A method for recording and reproducing data group names on a magnetic tape according to claim 1, characterized in that code signals are recorded and reproduced in mutually opposite phases using a bed in which one track is divided into two. .