KR100195978B1 - Method for selecting mode in multi vcr - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs:

Relates to a multi-video cassette record.

I. The technical problem the invention is trying to solve:

The present invention provides a method for preventing E-E screen gum gambling, which occurs when the video signal system in the E-E reception state is different from the mechanical operation in the multi video tape recorder.

All. Summary of the Solution of the Invention:

In a multi video cassette record, a method for detecting a video signal method according to a received video signal, detecting a playback signal method according to a playback signal from a recording medium, and setting the corresponding video mode is performed in the video signal input mode. Setting to the corresponding video mode according to the signal, searching for the playback mode in the playback signal input mode, and setting the video mode according to the playback signal when the playback mode is selected; The process of setting to the corresponding video mode according to the video signal.

la. Important uses of the invention:

This is implemented to prevent the noise of the monitor that is generated when the imaging method of the recording medium is different from that of the E-E mode.

Description

Mode Selection Method According to Image Type in Multi Video Cassette Record

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to video processing of a multi video cassette record (hereinafter referred to as a VCR). In particular, the video mode of the VCR is based on a different video system according to a playback mode and an EE (Electronics to Electronics) reception state. It relates to a method for setting.

In general, the imaging method is different in each country. Accordingly, the main methods of the video system include NTSC system, PAL system and SECAM system. Each difference according to the imaging method is a difference in the frame frequency, the number of scanning lines per frame, and the colorization method. The multi VCR is set to a corresponding mode by searching for a video signal so as to be compatible with each video system.

1 is a view showing an apparatus for selecting a mode based on a corresponding video system in a typical multi-video cassette record. Hereinafter will be described in detail with reference to FIG. Here, only the case of NTSC and PAL video will be described. The key input unit 40 includes a function key for setting various functions and a display unit for liquid crystal display of the state of the VCR. A playback key for playing back the tape is provided, and the VCR is set to the E-E mode and the playback mode. First, in the case of the E-E mode, the RF signal received from the antenna is input to the tuner in the VCR itself through the RF converter. In addition, the audio / video signal from the external device is input to the audio / video processing apparatus of the VCR through a cable. In this case, the E-E mode represents a mode in which a TV broadcast signal received through an antenna in a VTR and a video signal of an external device are processed through an RF converter, a tuner, an intermediate frequency converter, and a demodulator and displayed on a monitor screen. The sync signal detector 10 separates and outputs the vertical sync signal V-SYNC from the video signal. The microcomputer 30 determines the video system of the received video signal by determining the duty based on the rising edge of the vertical synchronization signal V-SYNC. When the vertical synchronization signal V-SYNC is 50Hz, it is PAL, and when it is 60Hz, it is NTSC. The microcomputer 30 outputs the first video control signal C1 in the PAL mode, and outputs the second video control signal C2 in the NTSC mode. When the play mode is performed, the tape is loaded, and the control head 50 picks up the control area of the tape. At this time, the signal of the control area, which is created by using the vertical synchronization signal, is recorded at the bottom of the tape. Thus, during regeneration, the timing of the control area matches the timing of the capstan motor or the rotating head cylinder motor that feeds the tape. The mechanism unit 20 moves the motor in a direction free of error by comparing the rotational speed and phase of each motor with the reference at all times to control the rotation of the cylinder or the running of the tape. The microcomputer 30 controls the mechanism unit 20 to detect the vertical synchronization signal in the control region of the playback video signal picked up from the control head 50. Accordingly, the microcomputer 30 sets and outputs the first image control signal C1 and the second image control signal C2 based on the vertical synchronization signal. The VCR is set to the PAL mode by the first image control signal C1 to set the color carrier of 4.43 MHz, and the VCR is set to the NTSC mode by the second image control signal C2 to 3.58 MHz by the second image control signal C2. Set. The color carrier is used as a reference frequency for video signal processing, OSD (On Screen Display) driving, and servo block driving.

2 is a flowchart illustrating a mode selection method according to an image method in a conventional multi-video cassette record. Hereinafter will be described in detail with reference to FIG. In the case of the video signal input mode in the E-E mode in step 211, the microcomputer 30 that inputs the vertical synchronization signal from the sync signal detector 10 detects the video signal method in step 212. That is, the microcomputer 30 detects whether the video system is in the PAL mode or the NTSC mode. In this case, the two image control signals C1 / C2 are opposite signals such as high level and low level. Therefore, the oscillator in the VCR itself oscillates the color carrier Fsc 4.43MHz / 3.58MHz due to the image control signal C1 / C2. Therefore, in step 214, the VCR is set to the corresponding video mode (PAL / NTSC). On the other hand, when the playback signal input mode is entered in step 215, the microcomputer 30 detects the playback signal method from which mechanism is recorded from the mechanism unit 20. Step 216 then transitions to step 213. In the non-signal standby mode in which no signal is input in step 217, the microcomputer 30 is set to an initially set mode in step 218. In this case, when the initial setting mode is set to PAL and the signalless standby mode is entered, the microcomputer 30 outputs the first image control signal C1 and is set to the PAL mode. Thereafter, in step 219, the microcomputer 30 searches for a video mode in which the multi VCR should be set through a return operation.

When the VTR is loaded with the playback signal input mode, the video mode is automatically determined for the control signal recorded on the tape through the control head 50 even if the playback mode is not executed. The image mode is switched instantaneously for the duration of the tape loading. If the video method of the video signal in the E-E mode and the video signal of the control section of the loading section are different, the video mode should be switched from the video signal input mode to the control signal input mode of the loading section. At this time, in the playback signal input mode of the VTR in which the playback mode is not performed, the screen of the E-E mode due to the instantaneous switching of color subcarriers is fluttered or a blue screen is occasionally generated on the OSD E-E mode screen.

Accordingly, an object of the present invention is to select a mode according to a video method in a multi video cassette record to prevent the EE mode monitor from chewing when the playback signal method and the video signal method are different in the playback signal input mode. In providing.

Another object of the present invention is to provide a mode selection method according to a video method in a multi-video cassette record for setting the corresponding video method according to the playback signal method only when the playback signal is input in the playback signal input mode.

1 is a diagram showing an apparatus for selecting a mode based on a corresponding video system in a typical multi video cassette record.

2 is a control flowchart of a mode selection method according to a video method in a conventional multi-video cassette record.

3 is a flowchart illustrating a method for selecting a mode according to an image type in a multi-video cassette record according to an exemplary embodiment of the present invention.

* Description of Reference Symbols for Major Parts of Drawings

10: synchronous signal detection unit 20: mechanism unit

30: microcomputer 40: key input unit

50: control head

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that like elements in the figures represent like reference numerals wherever possible. It should also be noted that in the following description of the embodiments, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to obscure the subject matter of the present invention.

3 is a flowchart illustrating a method for selecting a mode according to an image type in a multi video cassette record according to an exemplary embodiment of the present invention. Hereinafter will be described in detail with reference to FIG. A case of the video signal input mode for the external video signal in the E-E mode in step 311 will be described. In step 312, the microcomputer 30 detects the video signal system based on the vertical synchronization signal from the synchronization signal detector 10. Thereafter, the image control signal C1 / C2 according to the video signal method is output in step 313 and set to the corresponding video mode in step 314. At this time, the corresponding color carrier is output from the oscillator in the VCR itself according to the image control signal C1 / C2. On the other hand, if the re-signal signal input mode in step 315, the microcomputer 30 searches for the playback mode in step 316. The reproduction mode is selected by the user by the key input unit 40. When not in the playback mode, the microcomputer 30 detects the video signal method according to the video signal received in step 312 and sets the video mode. In addition, in the playback mode, in step 317, a playback signal method according to the playback signal is detected, and step 317 transitions to step 313. Thereafter, a corresponding video control signal according to the reproduction signal method is output. In the no-signal standby mode in which there is no video signal and playback signal received in step 318, the microcomputer 30 is set to an initially set mode as in step 319. At this time, the image method here is set to PAL.

As described above, even if the playback signal input mode is not the playback mode, the video signal mode is set according to the video mode of the received video signal. That is, the playback signal system other than the playback mode is ignored, and the video signal mode can be set only in the playback mode according to the playback signal system. Therefore, when the video signal of the received video signal and the video signal of the playback signal recorded on the recording medium are different in the playback signal input mode of the multi VCR, the EE screen flickers due to the instantaneous switching of the color carrier. It can prevent.

Claims (3)

A control method of a control unit for detecting a video signal method according to a received video signal in a multi video cassette record, and detecting a playback signal method according to a playback signal from a recording medium to set a corresponding video mode mode. Setting to the corresponding video mode according to the video signal in the video signal input mode, searching for the playback mode in the playback signal input mode, and setting the video mode to the corresponding video mode in the playback mode; The mode selection method according to the video method in the multi video cassette record, characterized in that the step of setting to the corresponding video mode according to the video signal when not in the playback mode. The method of claim 1, And reproducing the playback mode after the recording medium is inserted. The method of claim 1 or 2, wherein the setting of the corresponding video mode is as follows. Outputting a video control signal according to the video signal method and the playback signal method, and outputting a corresponding color subcarrier based on the video control signal. Way.