JPS6134772A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To realize a retrieving method close to a random access by recording contents information and address information of a program recorded to a magnetic tape to a starting end part of the magnetic tape and knowing an address of a prescribed program form the contents information. CONSTITUTION:Contents information and address information of a program are recorded to a starting end part of a magnetic tape 1 recording the program by means of controlling a system controller 36 with rotation heads 29 and 30. When a prescribed program is searched, data are reproduced from the magnetic tape 1 by the heads 29 and 30 and supplied from an output terminal 40 to a monitor. Consequently, since an address of the prescribed program can be obtained, address designation operation is performed and the magnetic tape 1 is quickly traversed. At this time, a cue signal recorded at the magnetic tape 1 is simultaneously reproduced, is counted by a cue signal counting device 39 and the counted value and the designated address are coincident. Then, the controller 36 stops the magnetic tape 1 and the prescribed program is headed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording/reproducing device that allows searching of contents recorded on a magnetic tape.

[Background of the invention]

Since a number of programs are usually recorded on a magnetic tape, it is necessary for a magnetic recording/reproducing device to be able to detect a desired program from such a magnetic tape, and various search methods for magnetic tapes have been used so far. Proposed.

1 to 3 show a conventional example of a search method for a magnetic recording/reproducing device, in which FIG. 1 is a plan view showing the recording state of the magnetic recording/reproducing device, and FIG. 2 is a plan view of the magnetic recording/reproducing device. FIG. 3 is a schematic diagram showing a recording pattern, and a plan view showing a search state of the magnetic recording/reproducing device. In addition, in FIGS. 1 to 3, 1 is a magnetic tape l 21'j', 516
17 is the guide, post, 8.9 is the tension post.

10.11 is impedance, roller, 12 is cylinder, 15 is capstan, 14 is pinch, roller.

15 is a full width erase head, 16 is an audio erase head,
17 is audio, CTL head, 18 is supply reel, 19 is take-up reel, 20 is cassette, case, 2
1, 22.25 is a program, and 24.25 is a cue signal.

In FIG. 1, during recording, the magnetic tape 1 pulled out from the cassette case 20 is placed in the cylinder 12 at 1800 mm.
It is wound spirally over the above length and runs in the direction of arrow A. The video signal of the old program previously recorded on this magnetic tape 1 is erased by a full-width erase head 15, and then a new program is erased by a rotary head (not shown) mounted on a cylinder 12 rotating in the direction of arrow B. The video signal of the program is recorded.

Furthermore, the magnetic tape 1 is connected to an audio erasing head 16 .
Audio, CTL head 17, audio signal,
After the control signal is recorded, it is wound onto the take-up reel 19 (at this time, a cue signal (hereinafter referred to as a key signal) is used as a signal to start a new program.
is the full-width erase head 15 at the start of recording each program.
recorded.

As a result, as shown in FIG. 2, programs 21, 22.25 are sequentially recorded on the magnetic tape 1, and cue signals 24, 25 are placed on the magnetic tape 1 at the recording start positions of each program 21, 22.25, respectively. recorded over the entire width.

When searching for a desired program from the magnetic tape 1 recorded in this manner, the magnetic tape 1 is not wound around the cylinder 12, but is run in the direction of arrow B within the cassette case 20. At this time, the tensile post 18 is provided with a read head (not shown), and this read head is brought into contact with the magnetic tape 1 to read out the cue signal.

In this search method, first, the magnetic tape 1 is fast-forwarded from its starting end, and when the cue signal is read out by the RAD, the magnetic tape 1 is wound around the cylinder 12 and the program is reproduced and monitored, and this is the desired program. If not, the magnetic tape is fast-forwarded again within the cassette case 2o, the cue signal is read out by the read head, and this operation is repeated until the desired program is retrieved.

For this reason, this search method takes a very long time to search for a desired program, and the read head provided on the tension post 8 is placed on the surface of the magnetic tape 1 on which the recording layer is provided. On the other hand, since it comes into contact with the opposite surface, there is a drawback that the readout efficiency of the cue signal is low.

In contrast, a search method has been proposed in which the magnetic tape is played back while running at high speed without using a cue signal, that is, search playback is performed.

FIG. 4 is an explanatory diagram of such a search method, where 1 is a magnetic tape, 26, 27 is a scanning locus of a rotary head, and 28 is a recording track.

In this retrieval method, the traveling path of the magnetic tape 10 is formed as shown in FIG. 1, and the magnetic tape 1 is played back while being fast-forwarded or rewound. The scanning trajectories 26 and 27 of the rotary head with respect to the recording track 28 when doubled are shown in FIG.

Through such search and playback, a recorded program can be played back to the extent that its contents can be understood.

However, this search method has the disadvantage that it is not possible to search at high speed because the running speed of the magnetic tape is limited by the tape tension and the rotation speed of the capstan motor.

Furthermore, there is also a search method that combines the method using the above-mentioned cue signal and the method using search playback. In this method, when a cue signal is read out, search playback is performed for about 50 seconds, and this operation is repeated until a desired program or program is found.

However, this search method also reproduces and checks the programs recorded on the magnetic tape one by one, so compared to the search methods shown in Figures 1 to 3 above, normal playback is slower. Even if the search time is reduced by the change to search playback, it still takes a lot of time to search for the desired program, and it also has the disadvantages of each of the above search methods.

As mentioned above, 1. The conventional search method for magnetic tape is
Since a series of programs are recorded sequentially in the longitudinal direction of the magnetic tape, and the reproduction order of the magnetic tape is always in the longitudinal direction, it inevitably takes a long time to search for a desired program.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording/reproducing apparatus which eliminates the drawbacks of the prior art described above and is capable of realizing a search method similar to random access for magnetic tapes with a relatively simple circuit configuration.

[Summary of the invention]

In order to achieve this object, the present invention records content information and address information of the program recorded on the magnetic tape at the starting end of the magnetic tape, learns the address of the desired program from the content information, The feature is that the desired program can be directly accessed without having to sequentially reproduce and check the programs.

[Embodiments of the invention]

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

FIG. 3 shows the configuration of an embodiment of a magnetic recording/reproducing apparatus according to the present invention (29, 50 are rotary heads, 31
is a cylinder motor, ) 2 is a video signal modulation/demodulation circuit, 55
is a data separation circuit, and 54 is a memory.

55 is a data output device, 56 is a system controller,
57 is a writing/reading system a device, 58 is a character signal generator, 59 is a cue signal counting device, 40 is a video signal output terminal, and 41 is a video signal input terminal, and parts corresponding to those in FIG. 1 are designated by the same reference numerals. is attached.

Next, the operation of this embodiment will be explained.

First, during recording, the magnetic tape 1 travels in the direction of arrow A, and as in the prior art described above, a key signal is recorded by the full-width erasing head 15&C, and the one-rotation head 29.5
0 records the program. At the same time, the data output device 55 outputs data representing the contents of the program to be recorded (hereinafter referred to as content information) and data representing the recording order of the program (that is, address information). These data are stored in the system controller 56
is stored in the memory 54 via a write/read control device 57 controlled by the output of.

When the recording of this program is completed, a rewind signal is sent from the write/read control device 57 to the system controller 56, and the rewind signal is sent to the beginning of the tape I Tti by the arrow A.
is rewound in the opposite direction.

The magnetic tape 1 then runs at a normal speed in the direction of the arrow, and at the same time is converted into a write/read video signal (hereinafter referred to as a data video signal). This data video signal is supplied to the rotary head 29, 501c. Further, an insert recording signal is supplied from the write/read control device 57 to the system controller 56,
A data video signal is inserted and recorded at the starting end of the tape 1. FIG. 6 is a flowchart showing the above operation.

When recording the next program on the same magnetic tape 1, first, the data video signal recorded at the beginning of the magnetic tape 1 is reproduced by the rotary heads 29 and 50, and then separated by the data separation circuit 55. The data is then supplied to the write/read device 57, converted into original data, and stored in the memory 34. Then, the next program is recorded by the rotary head 29.50, and data (content information and address information) regarding this program is stored in the memory 54. When the recording of this program is completed, all data is read out from the memory 34, converted into a data video signal by the character signal generator 58, and then recorded on the starting end of the magnetic tape 1.

In this way, each time a program is recorded on the magnetic tape 1, data is sequentially additionally stored in the memory 24, and a predetermined program is recorded on the magnetic tape 1.
f1. #So71-1ψ When programs are recorded on the entire disk 1, all data of these programs are inserted and recorded at the starting end of the magnetic tape 1.

Note that the output (control signal) from the audio/CTL head 17 is a control signal when data is taken into the write/read control device 57 from the data separation circuit 53.

FIG. 7 is a schematic diagram showing a recording pattern in the vicinity of the starting end of the magnetic tape 1 recorded as described above.
is data, 45.44 is a program, and 45.46 is a cue signal.

In the figure, the magnetic tape 1 includes a sequential program 45.
．． 44 are recorded, and a cue signal 4546 is recorded near the recording start position of each program 45.44. Program 45 recorded first on magnetic tape 1
In front of the magnetic tape 1, data 42 of all programs recorded on the magnetic tape 1 are inserted and recorded.

Next, the operation when searching for a desired program from the magnetic tape 1 recorded as shown in FIG. 7 will be explained.

In FIG. 3, data 42 (FIG. 7) U''-- is first reproduced from the magnetic tape 1 by the rotary heads 29 and 50, and is supplied from the output terminal 40 to a monitor (not shown) and displayed. The content information and address information of each program are displayed, and from this you can know the address of the desired program.

Then, the desired program is addressed and the magnetic tape 1 is fast-forwarded. At this time, the cue signals 45.degree. 46 (FIG. 7) recorded on the magnetic tape 1 are simultaneously reproduced. This cue signal is supplied to a key-signal counting device 59 for counting, and its counting output is supplied to the system controller 56. When the count value of the queue signal counting device 59 matches the designated address, the system controller 56 stops the magnetic tape 1, and the beginning of the desired program is performed.

In this way, the desired program can be directly searched for without sequentially reproducing and confirming the individual programs, and can be searched by almost random access.

The content information recorded at the beginning of the magnetic tape 1 is as follows:
The data may include location data such as recording date, recording time or continuous recording time, and recording channel. Of course, when recording scenes captured by a video camera as a program, the recording time and recording channel may be omitted, and only the recording date and recording duration may be included as content information.

In this way, by using the recording time and recording duration as content information, there is also the effect that the remaining tape capacity (hereinafter referred to as recordable time) can be easily confirmed.

FIG. 8 is a schematic diagram showing a specific example of data displayed on the monitor 47, in which the address, recording date, recording time, and recording channel are displayed from left to right. .

FIG. 9 is a block diagram showing a specific circuit configuration of one of the above embodiments, in which 48 is a microcomputer, 49
is an input terminal, 50 is a tie-r-, 51 is a tuner, 52
is RAIQi (Random Access Memo IJ),
55 is a synchronization signal separation circuit, 54 is a character signal generation circuit, 5
5 is a cue signal separation circuit, and parts corresponding to those in FIG. 3 are given the same reference numerals.

In this specific example, the write/read control device 37 and the queue signal counting device 59 in FIG. 3 are configured by a microcomputer 48, and the character signal generation circuit 58 in FIG. Synchronous signal separation circuit 55
It consists of A control signal from an input terminal 49 is supplied.

Next, the operation of this specific example will be explained.

When recording a program, while recording a cue signal, data such as the recording date and time, recording time, etc. are input from the timer 50, recording channel data is input from the tuner 51, and a signal indicating that recording is in progress is input from the system controller 56 to the microcomputer 48 and stored in the RAM 52. Remember. At the end of recording, a stop signal is input from the system controller 66 to the microcomputer 48, and the time data at that time is taken in from the timer 50 and stored in the RAM 52. At the end of this recording, the microcomputer 48
outputs a rewind signal and an insert recording signal to the system controller 56. Therefore, the data stored in the RAM 52 is read out, converted into a character signal via the character signal generation circuit 54, and inserted into the magnetic tape 1 for recording. This character signal generating circuit 54 receives horizontal and vertical synchronizing signals from a synchronizing signal separation circuit 55 in order to display the data as characters on the TV screen. Further, in order to search the recorded contents, a cue signal is inputted to the microcombi 4-48 via the key-signal separation circuit 55. By using the timer 50 as a recording program address input circuit and inputting a desired address, the microcomputer 48 compares the value for this address with the current count value of the cue signal, and performs fast forwarding and winding while monitoring the cue signal. By specifying return to the system controller 56, a search system that is close to random access can be achieved.

FIG. 10 is an explanatory diagram showing a specific example of the magnetic tape running state at the time of program access in the above embodiment,
Parts corresponding to those in FIG. 1 are given the same reference numerals.

In FIG. 10, as explained earlier, when the address of the desired program is confirmed by the data monitor and this address is specified, the magnetic tape 1 is transferred to the cassette case 2.
It runs at high speed within 0.

Here, the tension post 8 does not have a reading head attached thereto as in the prior art described above, but a full-width erasing head 15 that moves and comes into contact with the magnetic tape 1.

Reference numeral 15' denotes a full-width erasing head in contact with the magnetic tape 1, which reproduces the cue signal recorded on the magnetic tape 1.

In this case, since the full-width erasing head 15' contacts the magnetic tape 1 on its recording layer side, the efficiency of reading cue signals is greatly improved.

FIG. 11 is a flowchart showing the above-mentioned desired program access operation. By specifying the address of the program, the magnetic tape can be fast forwarded or rewound without monitoring the key signal.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to easily check the contents and addresses of all programs recorded on a magnetic tape, without having to check the contents of individual programs by specifying addresses. , it is possible to directly access a desired program, and it is possible to realize a search that is close to random access on magnetic tape.

[Brief explanation of drawings]

1 to 3 show a conventional example of a search method in a magnetic recording/reproducing device, in which FIG. 1 is a plan view showing the recording state of the magnetic recording/reproducing device, and FIG. 2 is a recording on a magnetic tape. FIG. 3 is a plan view showing the search state of the magnetic recording/reproducing device; FIG. 4 is an explanatory diagram showing another conventional example of the search method in the magnetic recording/reproducing device; FIG. 3 is the method according to the present invention. A configuration diagram showing an example of a magnetic recording and reproducing device,
6 is a flowchart showing the recording operation of the embodiment shown in FIG. 3; FIG. 7 is a schematic diagram showing the recording pattern of the magnetic tape;
Figure 8 is a schematic diagram showing an example of monitored data;
The figure is a block diagram showing one specific circuit configuration of the embodiment of FIG. 3, FIG. 10 is an explanatory diagram showing the running state of the magnetic tape at the time of program access in the embodiment of FIG. 3, and FIG. 5 is a flowchart showing a desired program access operation. 1...Magnetic tape, 15.15'...Full width erase head, 17...Audio, CTL head,
29.50...Rotary head, 52...Video conversion and demodulation circuit, 55...Data separation circuit, 54...Storage device, 55...Data output device, 56...System controller, 57...Writing/reading control device,
58... Character signal generator, 39... Cue signal counting device, 48... Microcomputer, 50...
Timer, 51...Tuner, 52...RAM.

Claims (1)

[Claims] In a magnetic recording and reproducing apparatus that records a cue signal at the recording start position of each program sequentially recorded on a magnetic tape, a first controller that generates content information of each program and address information of the program is provided. means, second means for storing the content information and the address information, and third means for controlling writing of information to the second means and reading of information from the second means. and a fourth means for converting the content information and the address information read from the second means into video signals, and after recording all the desired programs on the magnetic tape, the desired program is 1. A magnetic recording and reproducing apparatus characterized in that it is configured to be able to record all content information and address information on the starting end of the magnetic tape.