KR19980023486A - Channel switching method in video search mode of video cassette recorder - Google Patents

Abstract

The present invention relates to a method of screen searching of a video cassette recorder for driving a fast forward / reverse mode (FF / REW) and applying a reproduced signal to a television by driving in a playback mode only for a predetermined time from a tape section in which a vis signal is recorded. A first step 36 of determining whether the current mode is the TV mode during the driving of the fast forward / reverse mode; A second step (37) of applying a signal of a broadcast channel being received to the television in the TV mode as a result of the determination in the first step; A third step (38, 39) of changing a reception channel to a corresponding channel and performing the screen search mode when a command for changing the reception channel is applied during the execution of the second step; As a result of the determination of the first step, when the TV mode change command is applied, if not the TV mode, a fourth step (40, 41) of switching to the TV mode and performing the screen search mode.

The present invention has the effect that the user can freely change the channel for the EE mode in the screen search mode to avoid the monotony in the screen search mode.

Description

Channel switching method in video search mode of video cassette recorder

The present invention relates to a video cassette recorder (hereinafter referred to as a VCR), and more particularly, to a method for switching channels in a screen search mode.

The VCR is equipped with a function for searching for a signal recorded on a tape by using a bis signal. A bis signal refers to a signal that is unified as an index signal in a VHS VCR. This signal changes a waveform of a control signal recorded on a control track of a video tape (ie, the duty of the original control signal is 6 The duty ratio of this control signal is 4: 4 and the like is changed to 4: 6, and this duty ratio is used as an index by using 64 modified control signals as a vis signal.

By using such a bis signal, the conventional VCR could easily search for a video tape section desired by a user. That is, the user can record the vis signal in a desired section of the tape and detect the vis signal during playback so that the user can quickly search for the desired tape section. In addition, the conventional VCR has a function of allowing a user to quickly search for a desired tape section by sequentially reproducing only the section where the vis signal is recorded for a predetermined time when a plurality of vis signals are recorded on the tape. . A method of performing such a search function will be described with reference to FIG. 1.

As shown in FIG. 1, a plurality of bis-signals VS1-VS3 are recorded on a video tape, and each of the bis-signals VS1-VS3 has 64 control signals each having a duty ratio of 4: 6 as shown in FIG. Are gathered together.

At this time, if the user drives the VCR in the search mode at the position P1 of the tape, the VCR rewinds at a high speed. If the VCR detects the bis signal VS2 during the fast reverse, the VCR switches to the stop mode at a position P2 in which up to 21 control signals having a modified duty ratio are normally counted. However, in this case, the drum motor and the reels continue to rotate for a predetermined time due to the rotational inertia at the time of high speed backward, so that the time when the traveling of the tape wave is stopped becomes the point P3 out of the position P2.

Then, the VCR switches from the stop mode to the playback mode and operates for a predetermined time, thereby reproducing the video signal from the tape section in which the bis signal VS2 is recorded to the user up to a predetermined time (in this embodiment, the position P4). Then, the VCR is again driven in the fast reverse mode at the position P4, but does not detect the vis signal for a predetermined time, and detects the vis signal after this predetermined time (hereinafter referred to as a vis detection limit time). The above-described process is repeated when the non-signal signal VS3 is detected, where the reason why the VCR does not detect the non-signal signal for a predetermined time when the VCR reverses at the position P4 again can be easily seen from the drawing. Similarly, when the vis signal is detected again from the position P4, the vis signal VS2 is prevented from being detected again.

At this time, when the VCR is set in a TV mode, that is, a mode in which a signal from a broadcasting station is received and transmitted to a television, the VCR selects a section of the tape (P1-P3), that is, a section in which a signal recorded on the tape is reproduced. Except for this, it operates in the EE mode, which transmits a signal of a broadcasting station to the television, causing the television to display the received signal.

However, in the conventional VCR, when operating in the screen search mode in the EE mode, only a broadcast signal of a predetermined channel is received and there is a problem in that the reception channel cannot be changed.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a channel switching method in a screen search mode of a VCR capable of switching a reception channel even in an EE mode in a screen search mode.

The channel switching method in the screen search mode of the VCR according to the present invention includes.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view for explaining a screen searching method using a vis signal in a conventional video cassette recorder.

2 is a block diagram of a video cassette recorder for performing a channel switching method in a screen search mode according to the present invention;

3 is a flowchart of a channel switching method in a screen search mode of a video cassette recorder according to the present invention;

Explanation of symbols on the main parts of the drawings

10: tuner 11: recording processing system

12: Reproduction processing system 13: Deck

14: microcom 15: key matrix

16: modulator

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

2 is a block diagram of a VCR according to the present invention, in which a tuner 10, a recording processing system 11 and a reproduction processing system 12, a deck 13, a microcomputer 14, and key metrics 15 are shown. ) And modulator 16.

Here, the tuner 10 receives a broadcast signal of a predetermined channel under the control of the microcomputer 15, and the recording processing system 11 records the video and audio signals of the tuner 10 under the control of the microcomputer 14. It is configured to be processed and applied to the deck 13.

The deck 13 is configured to record the video signal of the recording processing system 11 to the video tape under the control of the microcomputer 14, or to read the video tape signal and apply it to the reproduction processing system 12. At this time, the deck 13 reads the control signal recorded on the control track of the tape and applies it to the microcomputer 14, and the microcomputer 14 detects a bis signal from the control signal to drive the VCR as described below. Control.

The reproduction processing system 12 reproduces the video signal of the video tape detected from the deck 13 and applies it to the modulator 16, which modulates 16 the tuner 10 under the control of the microcomputer 14. The signal applied from the broadcast signal or the reproduction processing system 12 or the external line input terminal LI is modulated into a predetermined RF signal and applied to the television.

The microcomputer 14 controls the drive of the tuner 10, the recording processing system 11, the reproduction processing system 12, the deck 13, and the modulator 16 in this way. Among the various function keys of the key matrix 15, the control is performed in response to a key selected or pressed by the user.

3 is a flowchart of a program stored in the microcomputer 14 for carrying out the present invention.

First, the microcomputer 14 determines whether the search mode is set according to the key of the key matrix 15 (step 31). If the search mode is set, the microcomputer 14 proceeds to step 32. FIG.

In step 32, the microcomputer 14 drives in the fast forward / reverse mode (FF / REW), and determines whether a vis signal is detected (step 33). At this time, as described above, the microcomputer 14 drives the modulator 16 in the EE mode for applying the broadcast signal of the channel received by the tuner 10 to the television.

The microcomputer 14 drives the VCR, that is, the deck 13, in the regeneration mode for a predetermined time when the bis signal is detected as a result of the determination of step 33, and causes the modulator to reproduce the regeneration process in the regeneration processing system 12. The signal of the recorded tape is controlled to be applied to the television (steps 34 and 35).

The process of steps 31-35 described above detects the section in which the vis signal is recorded, drives in the EE mode while the vis signal is detected, and in the reproducing mode for a predetermined period when the vis signal is detected, It can be seen that the output is the same as the conventional screen search mode.

However, in the present invention, when the non-signal signal is not detected during the performance of the conventional screen search mode, steps 36 to 41 are further performed when the fast forward / reverse (FF / REW) mode is performed.

That is, the microcomputer 14 determines whether the current mode is the TV mode in step 36. The reason for determining whether the TV mode is applied is that the line input mode may be set while the fast forward / reverse (FF / REW) mode is performed, and in this case, the EE mode is not performed.

As a result of the determination of step 36, the microcomputer 37 causes the modulator 16 to perform the EE mode in the TV mode. That is, the EE mode performed in steps 31-35 may be said to be set in step 37.

Then, the microcomputer 14 determines whether a key for changing the reception channel of the tuner 10 among the keys of the key matrix 15 is input in step 37, and if the key is input, causes the tuner 10 to respond to the corresponding key. Receive the signal of the channel and return to step 31.

On the other hand, as a result of the determination in step 36, when it is not the TV mode, the microcomputer 14 recognizes the current mode as the line input mode, and the key of the key matrix 14 for switching from the line input mode to the TV mode is In step 40, it is determined whether an input is made. As a result of the determination in step 40, if a key for switching to the TV mode is inputted, it returns to step 31 after switching to the TV mode.

That is, in the present invention, the reception channel can be changed by the user's key operation during the EE mode in the screen search mode.

As described above, the present invention has the effect that the user can freely change the channel for the EE mode in the screen search mode, thereby avoiding the monotony in the screen search mode.

Claims (1)

In the video searching method of the video cassette recorder for driving the fast forward / reverse mode (FF / REW) while driving in the playback mode for a predetermined time from the tape section in which the bis signal is recorded, and applying the reproduced signal to the television, A first step (36) of determining whether the current mode is a TV mode while the high speed / reverse mode is being driven; A second step (37) of applying a signal of a broadcast channel being received to the television in the TV mode as a result of the determination in the first step; A third step (38, 39) of changing a reception channel to a corresponding channel and performing the screen search mode when a command for changing a reception channel is applied during the execution of the second step; As a result of the determination in the first step, if a change command is applied to the TV mode other than the TV mode, the screen search mode of the video cassette recorder includes a fourth step (40, 41) of switching to the TV mode and performing the screen search mode. City channel switching method.