KR19980023491A - How to change the drive mode of a video cassette recorder - Google Patents

Abstract

The present invention relates to a driving method of a video cassette recorder having a tuner (1) for driving in a video cassette recorder mode for applying a video signal of the tuner (1) to a television. Step 21; Determining (22) whether the video signal received by the tuner (1) is modulated and applied to a television when the video cassette recorder mode is being driven; If it is a mode for modulating and outputting a video signal received by the tuner (1), determining (23, 24) whether or not the broadcast signal has been received by the tuner (1) for a predetermined time; If the tuner 1 has not received a broadcast signal for a predetermined time, steps 25, 26, and 27 read out and reproduce the video signal of the loaded magnetic tape and apply it to the television.

In other words, the present invention automatically reproduces the video signal of the magnetic tape and displays it on the television when the viewing of the television becomes impossible due to a blind spot when viewing the television using the VCR. It has an enhanced effect.

Description

How to change the drive mode of a video cassette recorder

The present invention relates to a video cassette recorder (hereinafter referred to as a VCR), and more particularly, to a method of automatically changing a driving mode of a VCR according to a reception state of a broadcast signal.

A VCR is a device that selectively magnetizes a magnetic tape video tape as a head to record video and audio signals or to read video and audio signals recorded on a video tape.

Such a VCR has a built-in tuner capable of receiving a television broadcast signal, and has been able to record a television broadcast signal or to view a television broadcast signal on a separate monitor or the like by using the tuner. On the other hand, a conventional VCR uses a television as a display device, and accordingly, the VCR modulates an image signal received by an internal tuner into a frequency band of a predetermined channel and applies it to the television, or a video signal recorded on a magnetic tape is a predetermined channel. It is driven in a VCR mode for modulating to a frequency band and applying to a television or in a television mode for directly applying a signal from an antenna of a VCR to a television.

On the other hand, a broadcast signal has a predetermined time zone, and in particular, an astigmatism zone may exist depending on the region, so that a user may not always watch a comfortable broadcast video signal. Particularly, portable VCRs are widely used nowadays, and as a result, portable VCRs are transported by vehicles to watch video signals of broadcast and magnetic tapes together with televisions. However, since a broadcast signal has a blind spot as described above, a user may not be able to receive a broadcast signal using a portable VCR. In this case, the user usually stops watching the television and reproduces and watches the video signal of the magnetic tape. However, as described above, the user has difficulty in operating the VCR when the VCR is in the vehicle.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to receive a signal of a predetermined television broadcast channel using a VCR, and the VCR automatically generates an image of a magnetic tape in a situation in which a broadcast video signal is not received while watching. A method of changing a VCR driving mode for reproducing and outputting a signal is provided.

A driving method of a video cassette recorder having a tuner and driving in a video cassette recorder mode for applying a video signal of a tuner to a television, comprising: determining whether the video cassette recorder is being driven in a video cassette recorder mode; Determining whether the video signal received by the tuner is to be modulated and applied to a television when the video cassette recorder is operating in the video cassette recorder mode; If it is a mode for modulating and outputting a video signal received by the tuner, determining whether the tuner has not received a broadcast signal for a predetermined time; If the tuner is not receiving broadcast signals for a predetermined time, reading and reproducing the video signals of the loaded magnetic tape and applying them to the television.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a video cassette recorder for performing a drive mode changing method according to the present invention.

2 is a flowchart of a method of changing a driving mode of a video cassette recorder according to the present invention;

Explanation of symbols on the main parts of the drawings

1: tuner 2: recording processing system

3: reproduction processing system 4: deck

5: Microcomputer 6: Modulator

7: Key matrix 8: Synchronization detector

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

1 is a schematic block diagram of a VCR for performing a mode change method of a VCR according to the present invention, as shown in the tuner 1, the recording processing system 2 and the reproduction processing system 3, the deck 4, A microcomputer 5, a modulator 6, a key matrix 7 and a synchronization detector 8 are included.

Here, the tuner 1 receives a broadcast signal of a predetermined channel under the control of the microcomputer 5, and transmits the received signal to the recording processing system 2 and the modulator 6 under the control of the microcomputer 5. It is configured to apply. That is, the microcomputer 5 drives in the VCR mode and the television mode according to the driving key of the key matrix 7, and in the television mode, the modulator 6 causes the antenna ANT signal of the tuner 1 to be directly connected to the television. In the VCR mode, the modulator 6 modulates the broadcast signal of the tuner 1 or the video signal of the reproduction processing system 3 into a signal of a predetermined channel (3 or 4 channels in the case of NTSC). To control the output. At this time, the microcomputer 5 drives the deck 4 in the reproducing mode to read and output the video signal of the magnetic tape as described later, and the modulator 6 reproduces and outputs the signal. ) Modulates the video signal of the reproduction processing system 3 into 4 or 4 channels and applies it to the tuner of the television. However, when the VCR is driven in the stop mode, the fast forward (FF) and the fast reverse mode, the tuner is adjusted. It is configured to modulate the received video signal of (1) into three or four channels and apply it to a tuner of a television.

In addition, the microcomputer 5 is connected to the synchronization detector 8 to determine whether the signal received by the tuner 1 is a broadcast signal, and the present invention is performed as will be described later. That is, since the synchronization detector 8 detects the synchronization signal from the video signal received by the tuner 1 and applies it to the microcomputer 5, the microcomputer 5 is the signal received by the tuner 8 as a broadcast signal of a predetermined channel. You can judge.

In addition, when the recording mode is in the VCR mode, the microcomputer 5 causes the recording processing system 2 to record and broadcast the broadcast signal of the tuner 1 to the deck 4, and the deck 4 Control to write the signal to magnetic tape.

In the reproduction mode, the microcomputer 5 causes the deck 4 to read the image signal of the loaded magnetic tape and apply it to the reproduction processing system 3, and the reproduction processing system 3 reproduces the image signal. To the modulator 6.

That is, the deck 4 in the present specification means all the mechanical and circuit mechanisms of the VCR that records the video signal on the magnetic tape or reads and outputs the video signal recorded on the magnetic tape, and the modulator 6 is a microcomputer. A modulation device for selectively modulating the video signal of the tuner 1 or the reproduction processing system 3 under the control of (5), and a switch for connecting the modulation device and the antenna ANT to the tuner of the television.

2 shows a flowchart of a program for causing the microcomputer 5 to perform the method of the present invention in the VCR thus constructed.

As shown, the microcomputer 1 first drives the drive mode of the VCR set by the key matrix 7 to the VCR mode (step 21), and modulator 6 receives the signal of the channel being received by the tuner 1. If it is determined whether the modulated output is performed (for example, the VCR is in the stop mode) (step 22), and the modulation is performed with the received signal of the tuner 3, the flow proceeds to step 23.

In step 23, the microcomputer 5 determines whether a sync signal is applied from the sync detector 8, and when the sync signal is detected, it means that a broadcast signal is being received by the tuner 1. If the feedback signal is fed back to (22) but no synchronization signal is applied through the synchronization detection unit 8, it means that the signal received by the tuner 1 is not a broadcast signal, which may be a temporary phenomenon due to a blind spot or the like. (5), the flow advances to step 24 to determine whether the synchronization signal is not detected for a predetermined time.

As a result of the determination of steps 23 and 24 as described above, when the synchronous signal is not detected for a predetermined time, the microcomputer 5 proceeds to step 25, and in step 25 the magnetic tape is inserted into the deck 4. Determine if it is loaded. Thus, it can be easily judged by the cam switch configured in the deck 4 which judges whether the magnetic tape is loaded, and such a technique is easily known to those skilled in the art. In this specification, the detailed description is omitted.

As a result of the determination in step 25, when the magnetic tape is loaded, the microcomputer 5 proceeds to step 26 to cause the deck 4 to read and output the video signal of the loaded magnetic tape and to reproduce the system. (3) reproduces this video signal and applies it to the modulator 6 (step 26).

Then, the microcomputer 5 proceeds to step 27 to allow the modulator 6 to modulate the output of the reproduction processing system 3 and apply it to the television so that the user can watch the video signal of the magnetic tape.

In other words, the present invention determines whether or not a broadcast signal is received by the tuner 1 in the television mode with or without a synchronization signal. When the broadcast signal is not received, the present invention reproduces a video signal of a magnetic tape loaded automatically. Is to be applied to.

Therefore, the present invention automatically reproduces the video signal of the magnetic tape and displays it on the television when the viewing of the television becomes impossible due to a blind spot or the like when the television is viewed using the VCR. It has an enhanced effect.

Claims (1)

A driving method of a video cassette recorder provided with a tuner 1 and driving in a video cassette recorder mode in which an image signal of the tuner 1 is applied to a television, Determining (21) whether to drive in a video cassette recorder mode; Determining (22) whether the video signal received by the tuner (1) is modulated and applied to a television when the video cassette recorder mode is being driven; If it is a mode for modulating and outputting the video signal received by the tuner (1), determining (23, 24) whether the broadcast signal has been received by the tuner (1) for a predetermined time; If the tuner 1 has not received a broadcast signal for a predetermined time, the video cassette recorder includes steps 25, 26, and 27 for reading and reproducing the video signal of the loaded magnetic tape and applying it to the television. How to change the drive mode of the.