KR100252015B1 - Record-signal erase method of video tape - Google Patents

Abstract

PURPOSE: A method for erasing a recording signal of a video tape is provided to forward a tape at a high speed in a half-loading state for erasing every signal of the tape, so that an erasing time can be reduced. CONSTITUTION: A microcomputer(34) decides whether a high-speed erase mode is set. If so, the microcomputer(34) makes the deck(33) driven in a high-speed backward mode until a front part of a tape is detected. If the front part of the tape is detected, the microcomputer(34) turns the deck(33) to a half-loading state to forward the tape at a high speed, and erases signals of the tape with a full erase head until an end of the tape is detected. If signals are erased to an end of the tape, the deck(33) backwards the tape at a high speed.

Description

Method for erasing recording signal of video tape

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder (hereinafter referred to as a VCR), and more particularly, to a recording signal erasing method of a video tape for erasing signals recorded on a video tape.

The VCR selectively magnetizes a video tape, which is a magnetic body, with the head, thereby recording video and audio signals, or reading video and audio signals recorded on a video tape.

It may be necessary to erase the video and audio signals recorded on the video tape in such a VCR or to record a new influence signal on a video tape on which video and audio signals are recorded. For this purpose, a full width erase head is conventionally constructed in the VCR.

That is, as shown in FIG. 1, the conventional VCR is changed to the full loading state when the playback and recording modes are set in the unloading state. That is, the guide rollers 1, the inclinable poles 2 and the tension poles 3 in the deck are moved to move the tape 5 provided through the supply reel 4, A guide pawl 6, a full erase head 7, an impedance roller 8, a head cylinder 9 and an audio erasing head 10, an audio head 11 And the pressure roller 12 to the take-up reel 13. The take- That is, in the reproduction mode, the signal read through the head mounted on the head cylinder 9 is reproduced in the state in which the driving of the full width erasing head 7 and the audio erasing head 10 is stopped. In the recording mode, The erasing head 7 records new video and audio signals on the head while erasing the signals recorded on the tape.

At this time, as shown in Fig. 1, there is a gap of a predetermined length between the full width erasing head 7 and the head cylinder 9, and the tape in this empty space is shortened by the full width erasing head 7 in the recording mode There is a problem that a new video signal is recorded in an erased state and thus mixed with a previously recorded video signal.

In this case, it is necessary to adopt a system in which the VCR is put into a recording mode and a silent signal is applied to the head. In this case, one video tape The recording and reproducing time is usually from 30 minutes to 2 hours or more, which causes a time loss and power consumption of the user.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording signal erasing method for a video tape capable of accurately erasing a signal recorded on a tape in a short period of time.

A method of driving a video cassette recorder for erasing a signal of a tape with a full width erasing head, comprising the steps of: determining whether a fast erasing mode is set; When the fast erase mode is set, fast reverse until the front portion of the tape is detected; And advancing the tape in a half-loaded state at high speed when the front portion of the tape is detected, and erasing the signal of the tape to the full width erasing head until the end portion of the tape is detected.

1 is a deck schematic view of a general video tape recorder,

FIG. 2 is a block diagram of a video cassette recorder that performs the present invention;

3 is a flowchart of a method of recording and erasing a video tape according to the present invention,

4 is a schematic view showing a deck in a half-loaded state in a video cassette recorder in the practice of the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

31: recording processing system 32: reproduction processing system

33: Deck 34: Microcomputer

35: Key metrics

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

FIG. 2 is a schematic block diagram of a VCR for performing a recording signal erasing method of a video tape according to the present invention. As shown in FIG. 2, a recording processing system 31 and a reproduction processing system 32, a deck 33, And a key metric 35. [

The recording processing system 31 records and processes the video and audio signals applied from a tuner or an external input terminal (not shown) under the control of the microcomputer 34 and applies it to the deck 33. The deck 33, The video signal of the recording processing system 31 is recorded on the video tape under the control of the control unit 34 or the signal of the video tape is read and applied to the reproduction processing system 32. [ At this time, the deck 33 includes a configuration as shown in Fig. 1, and it means all the mechanical and electronic mechanisms that enable the head of the cylinder 9 to record or read the video signal as described above The microcomputer 43 erases the signals recorded on the tape by applying a predetermined frequency signal to the full width erasing head 7 in the recording mode as described in the above description, And to apply a signal of a predetermined frequency to the full width erasing head 7 even under the fast erase mode.

The microcomputer 34 controls the driving of the recording processing system 31, the reproduction processing system 32 and the deck 33. The mode for controlling the driving in this way is a mode It is controlled by the user, i.e., in response to the pressed key. Here, a high-speed erasing key for carrying out the present invention should be constructed in the key metric 35, and the microcomputer 34 performs the present invention by driving the high-speed erasing key.

3 is a flowchart of a program stored in the microcomputer 34 for carrying out the present invention.

The microcomputer 34 determines whether the fast erase key has been pressed in step 41. If the fast erase key is pressed, the microcomputer 34 proceeds to step 42. In step 42, Mode. Then, the microcomputer 34 determines in step 43 that the initial portion of the tape has been detected from the start sensor (not shown in the figure, but generally mounted in the VCR as a sensor for sensing the beginning portion of the tape) in the deck 33, That is, whether a signal indicating that the tape has been rotated at a high speed to the beginning of the tape is applied.

As a result of the determination in step 43, when a signal indicating that the tape has been rotated at a high speed is applied to the tape, the microcomputer 34 proceeds to step 44. In step 44, And performs the fast erase mode of the present invention.

Here, the VCR has a half loading state halfway between the unloading state and the full loading state. In the half-loading state, guide rollers 1, an inclinable pole 2 and a tension pole 3 are moved as shown in FIG. 4, and the supply reel 4 is moved The tape 5 provided through the guide pawl 6, the full erase head 7, the head cylinder 9 and the audio erasing head 10 and the audio head 11 The tape is prevented from being damaged by the Impedence Roller 8 and the pressure roller 12 during the execution of the fast forward mode and the fast reverse mode by being provided to the take-up reel 13. [

The present invention utilizes this half-loaded state. That is, in step 44, the microcomputer 34 causes the deck 33 to be in the half-loaded state, to advance the tape at high speed in the half-loaded state, and to drive the full width erasing head 7.

Then, the microcomputer 34 proceeds to step 45 and determines that the end portion of the tape has been detected from the end sensor (not shown in the figure, but is generally mounted in the VCR as a sensor for detecting the end portion of the tape) It is determined whether a signal indicating that the tape has been rotated at a high speed to the end portion of the tape is applied.

That is, the signal indicating that the end is detected from the end sensor by step 45 means that the tape is completely erased from the beginning to the end of the tape.

Therefore, it can be easily understood that the time for erasing the signal of the tape according to the present invention is considerably reduced compared with the conventional case, that is, the time for erasing the tape in the recording mode.

In general, when the tape advances to the end of the tape at high speed, the microcomputer 34 performs the stop mode in which the deck 33 is stopped, that is, the fast advance is stopped. However, as described above, In one case, a given signal can be written back to the tape, so placing the tape at the beginning will result in improved user convenience.

To this end, the present invention causes the deck 33 to perform the fast reverse mode (steps 46 and 47) until the beginning of the tape is detected if the end of the tape is detected by step 45 (Step 48).

As described above, according to the present invention, when all the signals of the tape are erased, the tape is rapidly advanced in the half-loaded state and the signal of the tape is erased so that the time for erasing the signal of the tape can be greatly reduced. There is an effect that can be performed.

Claims (2)

(Correcting) a full width erasing head for erasing a signal of a tape, the method comprising: (41) judging whether or not a fast erasing mode is set; (42, 43) when the fast erase mode is set, until the leading edge of the tape is detected; And advancing the tape in a half-loaded state when the front portion of the tape is detected, and erasing the signal of the tape to the full width erasing head until an end of the tape is detected (44, 45) A method for erasing a recorded signal of a video tape. The method of claim 1, further comprising: (46, 47, 48) fast-backing the tape until a front portion of the tape is detected if the signal is erased to the end of the tap tape, Signal canceling method.