KR19990012997A - How to determine the type of video tape for recording - Google Patents

Abstract

The present invention relates to a method for recognizing a recordable time of a video tape having an audio track, a video track, and a control track, and in particular, setting the maximum recordable time of the tape in the initial stage of the control track according to the manufacturer's definition. A second process of dividing the CTL pulses recorded in the control track into intervals according to a predetermined size, and recording a data of a maximum recordable time defined in the first process among the predetermined sizes of the specific positions And a third process of accessing the information recorded through the first process and the second process to inform the user by OSD text.

Description

How to determine the type of video tape for recording

The present invention relates to the determination of a recording medium in a recording apparatus (eg, a VCR) capable of recording a television broadcast program, and more particularly, to a recording video for recognizing a type of a video tape having various recording times and informing a user of the recording medium. A method for determining the type of tape.

In general, a VCR is a device for recording a video signal and an audio signal on a magnetizable video tape, and reproducing the video signal and a voice signal when necessary, so that the VCR can be viewed through a display means such as a CRT or a TV. It is configured as shown, Looking at the configuration, the microcomputer 600 for controlling the overall operation of the VCR by the operation of the keypad (900C) or the remote control (900A), and the data to be processed in the microcomputer 600 Memory 500 for storing the tuner 100, the tuner 100 for receiving the broadcast signal of the channel selected by the tuning voltage output from the microcomputer 600 from the antenna ANT, and the broadcast received by the tuner 100 The IF detector 200 detects the intermediate frequency from the signal, and the head H is applied to the video tape (cassette) mounted on the video technology, operating according to the operation control signal output from the microcomputer 600. The recording unit 300 for recording the signal output from the IF detector 200 and the operation according to the operation control signal output from the microcomputer 600 (usually recoil with respect to the recording unit 300) and the video Reproducing unit 400 for accessing and outputting the signal recorded on the video tape (cassette) that is seated in the tech through the head (H), and receives the character information output from the microcomputer 600 and outputs it as an image OSD generation unit 700 for outputting the corresponding character image, the signal output from the playback unit 400 and the jitter output from the OSD generation unit 700 is processed and transmitted to the TV side or CRT side The signal processor 800 is large.

Referring to the process of recording a television broadcast in the conventional VCR configured as described above are as follows.

If the user wants to record a specific television broadcast program, the user can set a video tape of a predetermined capacity in the videotechnologies, and provide information on a channel for receiving a broadcast program desired to be recorded and a start time and an end time of the program. It is set through the operation of the keypad 900C or the remote controller 900A and stored in the memory 500.

Through the above process, the data stored in the memory 500 serves as reference data necessary for the operation of the microcomputer 600, and the microcomputer 600 starts the corresponding program based on the information stored in the memory 500. It is determined whether the time has passed through timer counting, and when the start time of the corresponding program is reached, the tuner 100 and the recording unit 300 are operated so that the broadcast received through the antenna is placed on the video tape (cassette). Will be recorded.

In addition, when it is determined that the end time of the program is reached by counting the end time, the microcomputer 600 stops the operation of the tuner 100 and the recording unit 300.

However, at this time, even if the recording capacity of the videotape seated on the video technology is small compared to the recording time of the program due to a user's mistake or the like, the microcomputer 600 does not correctly recognize the recording and thus performs normal recording. If the remaining tape is not enough, recording stops when the recording is not completed.

Therefore, it is a problem to fail to record the program completely.

In order to solve such a problem, the related arts proposed recently include Korean Patent Application Nos. 97-14062 (hereinafter referred to as First Prior Art) and 97-14060 (called Second Prior Art). The technical commonality of the first and second prior art is to examine the recordable residual amount of the video tape seated in the videotech.

At this time, the first prior art advances the recording time to the 3x or 4x recording mode so that the recording time of the corresponding program is suitable for the detected residual amount, that is, the recording speed is abnormally slow to drive the program to be recorded completely. It is a way of recording.

In addition, the second prior art sets the importance level for each program on a video tape in which a plurality of programs are recorded, and records a new program on a previously recorded program in the reverse order of importance when the remaining amount for a later recorded program is small. That's the way it is.

However, the first prior art of these prior arts has a disadvantage in that the image quality is poor during playback because a large amount of video data is recorded in a small area, and the first prior art does not sequentially record an area for recording a program according to importance. There is a disadvantage in that a portion that is skipped or rewinded without being generated occurs and the playback screen is shorted as much as the corresponding portion.

In addition, even in this prior art, by using both a mechanical operation and a software method in detecting data according to the remaining amount of recording of the video tape, a considerable time is required even when the user first sets a blank video tape on the video technology. After this elapses, the user is warned.

An object of the present invention to solve the above problems is to manipulate the CTL pulses recorded on the control track to record the information according to the total recordable time of the video tape every predetermined pulse unit, so that during the initial playback process when the tape is mounted The present invention provides a method of determining the type of video tape for recording to warn and alert a user.

1 is a schematic overall block diagram of a conventional VCR

2 is an exemplary diagram of information storage track of a general video tape;

3 is an exemplary diagram of a CTL pulse for recording information on a control track;

4 is an exemplary diagram of a concept of storing information on a recordable time in a control track according to the present invention.

A feature of the present invention for achieving the above object is a method of recognizing the recordable time of a video tape having an audio track, a video track, and a control track, wherein the maximum recordable time of the tape is determined at an initial stage of the control track. A first step of setting according to the manufacturer's definition, and a CTL pulse recorded on the control track at intervals according to a predetermined size, and a predetermined size of a specific position is defined for the maximum recordable time defined in the first step. And a third process of recording data, and a third process of accessing the information recorded through the first process and the second process to inform the user by OSD text.

Another aspect of the present invention for achieving the above object is a method of recognizing the recordable time of a video tape having an audio track, a video track, and a control track, the maximum recordable time of the tape in the initial stage of the control track. The first process of setting the data according to the manufacturer's definition, and the second process of dividing the CTL pulses recorded on the control track into intervals according to a predetermined size, and setting a predetermined size of a specific position as a recordable time definition region. And a third process of recording the remaining recordable time in the area set in the second process by subtracting the time required for tape recording from the maximum recordable time defined in the first process, and recording through the third process. And a fourth step of accessing the information and informing the user in OSD text.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, in the VHS VCR, the head is configured to be inclined at a predetermined angle. As shown in FIG. 2, the field is rotated along the inclination angle of the inclined head, and one field of video is recorded on one video track. The data is saved.

In this case, various control information is stored in the control track in the form of a CTL pulse, wherein the shape of the CTL pulse is the same as that shown in FIG. To distinguish between rows. 3 illustrates a case in which logic high and low are classified according to whether the ratio of the duration of the low state to the duration of the high state is 1: 2 or 2: 1. .

Therefore, in the present invention, a process of storing a control code according to a conventional CTL pulse is divided into n-bit units, and for each region divided by n-bit units, information on the total recordable time of the entire tape is recorded for the first 8 bits. By setting the interval to store, the CTL pulse for the control of the VCR actually takes the form of n-8 bits.

That is, as shown in the accompanying Figure 4 implemented.

Therefore, if the forward progress is performed only for a predetermined period during tape playback or initial tech seating, information on the original total recordable time of the video tape currently seated on the tech can be recognized, thereby prompting the user.

In addition, when recording multiple programs on one tape, the current recording time is defined every minute by subtracting the current recording time from the maximum recordable time defined by the supplier in the initial stage of the video tape. It can quickly recognize the remaining recordable time.

By providing the apparatus for determining the type of video tape for recording according to the present invention operating as described above, it is possible to prevent the video tape cassette having a smaller capacity than the program to be inadvertently recorded on the video tech.

Claims (2)

A method for recognizing the recordable time of a video tape having an audio track, a video track, and a control track, A first step of setting, at the initial stage of the control track, the maximum recordable time of the tape according to the manufacturer's definition; A second process of dividing the CTL pulses recorded in the control track into intervals according to a predetermined magnitude; A third step of recording data for a recordable maximum time defined in the first step at a predetermined size of a specific position distinguished in the second step; And And a fourth process of accessing the recorded information through the first process and the third process to inform the user by OSD text. The method of claim 1, wherein when a predetermined size is set as an area of a recordable time definition in an area divided in the second process, the required time according to tape recording is subtracted from the maximum recordable time defined in the first process. A fifth step of recording a remaining recordable time in an area of the recordable time definition; And And a sixth process of accessing the recorded information through the fifth process and informing the user of OSD text.