JPS62167691A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To facilitate the confirmation and retreival of all recorded programs by storing the video signal of one scene of each program and tape location information and recording each program sequential video signal and the tape location information to a tape starting end. CONSTITUTION:A video signal representing the content of a program and the information of tape position on which the video signal is recorded actually are stored to the tape starting end as a digest version and a control means 26 stores the tape position of the recording end of the digest version. When the digest version of one program is formed, the user finds out a next program desired to form a digest version, it is reproduced and the start of digest version of the program is executed by depressing a switch 24 again. Then the digest version of the next program after the digest version formed precedingly is recorded. Similarly, the digest version of the next program is recorded after the digest version generated precedingly. The operation is repeated and the digest version of plural programs are recorded sequentially from the tape start. Thus, a desired program is retrieved instantly by having only to reproduce the vicinity of the tape start.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a magnetic recording/reproducing device such as a video tape recorder (hereinafter referred to as VTR), and in particular, to a magnetic recording/reproducing device such as a video tape recorder (hereinafter referred to as VTR), and particularly to a magnetic recording/reproducing device that allows recorded programs to be easily confirmed and searched. The present invention relates to a magnetic recording/reproducing device that can be used.

Conventional technology In recent years, the tape recording speed of VTRs has increased to twice or three times the standard speed.
Products with twice the mode were put on sale, and tapes with thinner tapes that could be used for long periods of time were also put on sale, and VTR
It became possible to record up to eight hours of programs on a roll of tape. Along with this, many tapes containing many programs recorded on one volume have also been produced.

Conventionally, the easiest way to check the contents of the programs recorded on the 11-volume tape is to write an annotation with the name of the recorded program and paste it on the outside of the tape or on the tape case. However, for tapes without annotations, you can check them by playing them fast forward or backward, by playing them from time to time while fast forwarding and rewinding, or by a combination of both. I am doing it.

Problems to be Solved by the Invention However, among the above-mentioned methods of checking recorded programs on a tape, the method of pasting annotations on the recorded programs does not allow the content to be known only as text information, and it is difficult to know what kind of video signal actually exists. I don't know if it is recorded.

Also, when you actually want to play the program, the way to search for that program is the same way as the above method for checking tapes without annotations, using a combination of play, fast forward, rewind, fast forward play, and rewind play You must search using this method. However, the method of checking programs by fast-forwarding and rewinding takes a lot of time to search for, and the method of playing them occasionally by fast-forwarding and rewinding allows you to check programs that have been passed by fast-forwarding and rewinding. had the problem that it could not be confirmed.

In view of the above-mentioned problems, the present invention stores a part of the video signal of each program and the tape position where the video signal is recorded using a single image memory and a tape position information memory, and stores a part of the video signal of each program and the tape position where the video signal is recorded. By recording part of the video signal of a program, and recording the tape position information where the video signal is actually recorded when recording the video signal, you can play the entire program just by playing back the beginning of the tape. The purpose of the present invention is to provide a magnetic recording and reproducing device that allows users to check the program using a video signal, and to instantly search for a desired program based on the tape position information recorded thereon.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention includes: an image memory section capable of storing at least one field of video signals; tape position detection means for detecting the tape position; a tape position information memory unit capable of storing tape position information detected by the tape position detection means at least once; a head for recording and reproducing signals on a recording medium; and a tape position information memory unit capable of storing tape position information detected by the tape position detection means at least once; tape position information recording means for recording tape position information; tape position information reproducing means for detecting tape position information from a signal reproduced by the head; input means for starting a tape search; At the position, a command is sent to store the video signal on the tape in the image memory section, a command is sent to store tape position information in the tape position information memory section, and then the tape is moved to a specific position. After that, control is performed to send a command to record the video signal stored in the image memory section on the tape, and also to send a command to record the tape position information stored in the tape position information memory section in the tape position information recording means. is performed at least once, and then when a certain specific position on the tape is being played back, when a command to start searching for the tape is inputted by the input means, the tape position information detected by the tape position information playback means is and control means for moving the tape to a matching tape position.

According to the above-described structure, the present invention stores a part of the video signal of each program in the image memory section, stores the tape position information at that time in the tape position information memory section, and stores the video signal at a certain position on the tape for each program. By recording the video signals collectively stored in the image memory section and recording information on the tape position where the video signals are actually recorded, it is possible to create a digest of all programs recorded at a specific position on the tape. You can create a version and check all programs just by playing back that position.Also, if you find the program you want to play from the digest version and input the command to start searching there, data will be recorded there. The tape position of the program can be automatically detected from the tape position information provided, and the program can be immediately searched and played.

Embodiments Hereinafter, magnetic recording and reproducing apparatuses according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of the invention. In FIG. 1, 1 is a tape, 2 is a cylinder 13, a cassette tape 14 is a supply reel, 5 is a take-up reel, and 6 is a take-up reel.
and 7 a video head installed inside the cylinder 2 for recording and reproducing video signals.

8 is a control head for recording and reproducing control signals; 9 is a rotation detector for detecting the rotation of the take-up reel 6; the rotation is detected magnetically, photoelectrically, or mechanically by the reel stand 1o and the detection element 11; ing. Although the rotation detector 9 is configured to detect the rotation of the take-up reel 6, it may also be configured to detect the rotation of the supply reel 4.

12 is a video signal playback circuit that outputs a video signal from the playback signal of the video head 6.7; 13 is a video signal playback circuit that outputs a video signal from the playback signal of the video head 6.7;
This is a video signal recording circuit that records video signals. 14 is a video signal reproduced by the video signal reproduction circuit 12.
It is an image memory section that can store fields, and includes an amplifier 16 that amplifies the video signal, an AD converter 16 that digitizes the amplified analog video signal, and a digital converter 16.
A memory and memory control circuit 17 includes a memory for storing one field of a digital video signal generated by a digital video signal, and a memory control circuit for performing address control, timing control, etc. so that the memory reads and writes one field; It is comprised of a DA converter 18 that converts the read digital video signal into an analog signal, and an amplifier 19 that amplifies the analog video signal.

20 counts up the reel pulses of the take-up reel 6 generated by the rotation detector 9 according to the rotation direction information of the take-up reel 5 sent from a travel control means (not shown) that controls the rotation direction and rotation speed of the reel. tape position detection means that counts down and detects the current position of the tape;
Reference numeral 21 denotes a tape position information memory section for storing tape position information detected by the tape position detection means 2o in accordance with instructions from the control means 26; 22 a tape position information memory section 21;
Tape position information recording means 23 records data on the tape 1 using the control head 8 according to commands from the control means 26 on the tape position information stored in the memory. The tape position information reproducing means 124 detects the tape position information at an arbitrary position on the tape and stores the video signal in the image memory section 14 when in the reproduction mode, and also stores the tape position information at that time in the tape position information memory section 21. Memory switch, 2
Reference numeral 5 indicates a switch 126 for starting a program search, a control means for controlling each means/circuit of the embodiment of the present invention, and 27 a tape start end sensor for detecting the start end of the tape 1.

The operation of the magnetic recording/reproducing apparatus constructed as described above will now be described with reference to FIGS. 1 to 4.

First, a certain program from a tape containing a large number of programs is played back, and when the switch 24 is pressed on the screen 1 where the content of the program can be most easily understood, for example, the screen where the title of the program is displayed, the 1 control means 26 switches the 24, a command is sent to the image memory section 14 to store the video signal to be reproduced by the video signal reproducing circuit 12 at that time, and a command is sent to the tape position information memory section 21 to store the tape position information at that time. Thereafter, the first control means 26 sends a tape rewinding command to the running control means (not shown) that controls the running of the reel, and when the tape starting edge sensor 27 detects the tape starting edge, the VTR is put into the recording mode, and the video signal recording circuit 1
3, a command is sent to record the video signal stored in the image memory section 14, and at the same time, a command is sent to the tape position information recording means 22 to record the tape position information stored in the tape position information memory section 21.

An example of a method for recording tape position information will now be described with reference to FIGS. 2 and 3.

When recording two programs on a VTR, control pulses are recorded on the tape by a control head 8 in order to control the capstan motor cylinder motor so that the video signal during playback is not disturbed. The control pulse has one period of 33.3 times, with one period being the saturation recording of the N and S poles of the tape.
During playback, the signal obtained from the positive edge of the control pulse is used to control each motor, while the negative edge is independent of the control of each motor. In other words, whatever value the duty of the control pulse during recording is, it is irrelevant to the basic operation of the VTR. This embodiment utilizes this fact to modulate the duty of the control pulse to record tape position information.

FIG. 2 is a diagram showing a recording waveform of a control pulse according to an embodiment of the present invention. When recording information of 1, the duty of the control pulse is recorded at 60% or more, and information of 0 is recorded. In this case, the duty of the control pulse is set to less than 60%. In addition, in this embodiment, the duty of the control node is set to record 1 information and 0 information at 60%, but 11 and 0 information are recorded.
Any duty may be recorded as long as it can be distinguished.

The tape position information recording means 22 records tape position information in a coded manner so that the information can be detected during reproduction. This will be explained using FIG. FIG. 3 is a diagram showing recording codes for tape position information in an embodiment of the present invention, in which numerals in the figure are block codes, B in the figure is a head code, and C in the figure is a tape position information code. Block code A is composed of head code B recorded as 0111110 and a 4-digit binary coded decimal code (binary code
The tape position information code C is the value of the reel counter counted by the tape position detecting means 20, which is generated by the ecldec system (hereinafter abbreviated as BCD code).

The reason why head code B is set to 0111110 is because in a multi-digit BCD code, 1 can only be inserted up to 4 times in a row between 0 and ○ (for example, 79 in decimal notation is
(When expressed as a code, it becomes 01111001, and 1 continues only up to four times.) No matter where the tape runs in the forward or reverse direction, if it detects 0111110, it can be recognized as a Herad code.

The tape position information recording means 22 records a group of codes obtained by repeating this block code A three times as tape position information.
The information of 0 and the information of 0 are recorded using the duty modulated signal shown in FIG.

Note that the tape position information does not have to be the recording code shown in FIG. 3, but may be of any type as long as the tape position information can be detected during reproduction.

As described above, the video signal indicating the content of one program and the information on the tape position where the video signal is actually recorded are recorded as a digest version at the beginning of the tape, and the control means 26 records the digest version on the tape after recording. Remember the location. After creating a digest version of one program, the user finds the next program for which a digest version is to be created, plays it, and presses the switch 24 again to start creating a digest version of that program. after that.

By the same operation as described above, the digest version of the next program is recorded after the digest version created one time before. By repeating this operation, digest versions of a plurality of programs are recorded sequentially from the beginning of the tape.

FIG. 4 is a diagram showing the recording state of the tape according to the embodiment of the present invention. First of all, when you press the switch 24 when playing the track A, which is the best way to recognize the content of the program, A,)
The video signal of the rack is stored in the image memory 14, and the tape position 0123 at that time is stored in the tape position information memory section 21.
The tape is then rewound to the beginning of the tape, and the same video signal as track A1 is recorded from the beginning of the tape. At the same time, the value 0123, which is the tape position information of track A, is recorded on the control track as shown in Figures 2 and 3. Recorded using the recording waveform and code system shown. Similarly, for the B program and C program, the video signals and tape position information of the B, track and O, track are recorded, and the tape enters the recording state shown in FIG. 4. As you can see from Figure 4, by simply playing back the area near the beginning of the tape, you can immediately check what program is being recorded, and you can also immediately recognize the tape position where the program is recorded. can.

A method of searching for a program using a tape recorded as shown in FIG. 4 will be explained. B near the beginning of the tape in Figure 4
When the switch 25 for starting a program search is pressed while a track is being played back, the control means 26 inputs the tape position information recorded on the control track detected by the tape position information playback means 23 and determines the one tape position. The tape is fed in a fast forward mode until the tape position information sent from the detection means 20 becomes the tape position information detected by the tape position information playback means 23, and when the value reaches that value, the tape is put into the playback mode. That is, when track B is reproduced, the tape position information reproducing means 23 reproduces the signal recorded on the control track with the control head 8, measures the duty of the reproduced signal, and determines whether information 1 is recorded or information O is recorded. It is detected whether the tape position information is recorded, and the value o667 of the tape position information is detected from the detected code group and the recording code of the tape position information shown in FIG. The control means 26 sends a command to the running control means (not shown) to put the tape in fast forward mode until the tape position detecting means 20 reaches a value of 0667, and then outputs a command to put the tape in playback mode. Program B
is played.

As described above, according to this embodiment, the video signal and tape position information of one scene of each program are stored in memory, and the video signal and tape position information of each program are sequentially recorded at the beginning of the tape. This makes it easy to check and search for all programs currently available.

Although the video signal and tape position information of each program are stored in memory using a switch during playback, they may be stored automatically during program recording. Further, the capacity of the image memory unit may be set to be for a plurality of fields, and the tape position information memory unit may also be configured to be able to store a plurality of memories, so that a plurality of locations are memorized at once and then recorded continuously at the beginning of the tape. Furthermore, although the digest version is recorded at the beginning of the tape, it may be recorded at any position on the tape.

Also, tape position information was obtained using a reel counter, but
Any information that allows you to absolutely know the tape position will do.

Effects of the Invention As described above, according to the present invention, part of the video signal of each program recorded on a tape and the tape position where the video signal is recorded are memorized, and a specific position on the tape is memorized. By sequentially recording video signals and tape positions for all programs, it is possible to easily check all recorded programs by simply reproducing the specific position. Furthermore, it is possible to immediately search for a desired program from the tape position information recorded at the specific position. In addition, control means
The tape position detecting means, the tape position information memory section, the tape position information recording means, and the tape position information reproducing means can be composed of one microcomputer, and the overall structure is simplified.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a recording waveform diagram of a control pulse in an embodiment of the present invention, and FIG. 3 is a code structure showing a recording code of tape position information in an embodiment of the present invention. 4 are pattern diagrams showing the recording state of the tape according to the embodiment of the present invention. 8... Control head, 9... Rotation detector, 12... Video signal reproducing circuit, 13...
...Video signal recording circuit, 14...Image memory unit, 20...Tape position detection means, 21.
...Tape position information memory section, 22...
Cheese position information recording means, 23...Tape position information reproducing means, 24.25 Old switch, 26...
. . . Control means, 27 . . . Tape start end sensor. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 βC9 code, 4ffT (/6 br cut

Claims (3)

[Claims] (1) A magnetic recording and reproducing device for recording and reproducing video signals on a recording medium on a tape, comprising: an image memory section capable of storing at least one field of video signals; a tape position detection means for detecting the tape position; a tape position information memory unit capable of storing tape position information detected by a tape position detection means at least once; a head for recording and reproducing signals on a recording medium; and a tape position memorized by the head in the tape position information memory unit. tape position information recording means for recording information; and at a certain arbitrary position on the tape, transmitting a command to store a video signal on the tape in the image memory section and at the same time recording tape position information in the tape position information memory section. After sending a command to store the tape and then moving the tape to a certain position, sending a command to record the video signal stored in the image memory section on the tape, and then moving the tape stored in the tape position information memory section. 1. A magnetic recording and reproducing apparatus comprising: control means for performing control at least once to send a command to record position information on said tape position information recording means. (2) It includes a tape position information reproducing means for detecting tape position information from a signal reproduced by a head, and an input means for starting a tape search, and the control means is for reproducing a certain position on the tape. When a command to start a tape search is input through the input means, the tape is moved to a tape position where the tape position information detected by the tape position information reproduction means and the tape position information detected by the tape position detection means match. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the magnetic recording and reproducing apparatus controls movement. (3) A control head is used as the head, and the tape position information recording signal group output from the tape position information recording means is formed of two signals with different duties. 1st term or 2nd term
The magnetic recording and reproducing device described in 2.