KR19980058802A - How to automatically switch the modulator of a video cassette recorder - Google Patents

Abstract

The present invention relates to a method for automatically switching a modulator of a video cassette recorder, and upon initializing the video cassette recorder, the OSD is processed by the OSD control unit by the display control signal of the microcomputer and displayed on the next screen, and the desired country or broadcasting is performed through the key input unit. When the system is selected, the control signal of the microcomputer is switched to the corresponding broadcast method of the modulator, and the broadcast signal provided from the signal processor is signal processed according to the broadcast method, so that the modulator according to the broadcast method selected at the initialization of the video cassette recorder is selected. Since it is automatically switched, not only the function of the modulator can be selected more easily, but also for the convenience of the user.

Description

How to automatically switch the modulator of a video cassette recorder

The present invention relates to a video cassette recorder, and more particularly, to a method for automatically switching a modulator of a video cassette recorder suitable for automatically switching the output of a modulator.

As is well known, thanks to the development of modern society, each home is equipped with video equipment such as a television and a video cassette recorder. Such a video device receives and processes a broadcast signal transmitted from a broadcasting station and outputs it to a monitor so that the viewer can watch it. In particular, the video cassette recorder has a recording function for recording a composite video signal applied from a tuner tuned to a desired channel through a antenna and a composite video signal recorded on the magnetic tape to reproduce the composite video signal recorded on the magnetic tape. By having a playback function displayed on the monitor, viewers can watch the program they want to watch at any time.

On the other hand, the television broadcasting system can be divided into NTSC, PAL and SECAM system, accordingly video cassette recorder is also divided into NTSC, PAL and SECAM system.

Here, the NTSC (National Television System Committee) method is widely adopted mainly in Japan, the United States, Canada, and the like. The color signal, that is, the R, G, and B signals is converted into one luminance signal (Y) and two color differences (I). M), and then modulate a subcarrier with a frequency of 3.58 MHz in the video band with two color difference signals. The composite signal obtained by combining the modulated color difference signal and the luminance signal modulates and transmits a carrier having a higher frequency and has 525 scan lines.

On the other hand, PAL (Phase Alternation Line) method is adopted by Europe and China such as UK, Germany, Italy, Switzerland, and two-color right angle two-color subcarrier by two color difference signals BY and RY different from NTSC method. The modulated signal is transmitted in addition to the luminance signal by inverting its polarity by 180 ° per scan line 1H. The receiving side reproduces the color difference signal by the sum and difference of the color difference signals. In the PAL method, the number of scanning lines is 625, whereas the number of scanning lines is 525, which is called the PAL-M method.

SECAM (Sequential Couleur A Memory) method is east of France. In the method employed in the former Soviet Union, the color subcarriers are alternately frequency-modulated into two color difference signals for each scanning line 1H, and the modulated color difference signals are superimposed on the luminance signal and transmitted every 1H, and the receiving side transmits the signal every 1H. It is a color television system that reproduces colors on the same scan line by delaying.

Each of the above methods is used in various ways due to the characteristics of the country. For example, the United States, the United States, Japan, Canada, and the like use the NTSC method, and the United Kingdom, Germany, Australia, and New Zealand use the PAL method, and France and the Soviet Union. , Hungary and Poland use SECAM.

Therefore, the signal processing between each broadcast system can be signal processed by selectively switching the modulator in the video cassette recorder according to the broadcast system.

However, in the related art, since an initial setting of a dip switch mounted on a predetermined part of a modulator is performed by an expert or installer, the modulator signals the corresponding broadcasting signal of a corresponding country, so that there is a troublesome problem, and when an export or a foreigner immigrates. There was a hassle to get the service or the user has to switch it every time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to allow a country to be selected as a screen at the time of initial setting of a video cassette recorder, and to automatically switch modulators according to the selected country. The present invention provides a method for automatically switching a modulator of a video cassette recorder.

In order to achieve the above object, a modulator automatic switching method of a video cassette recorder according to the present invention is a broadcasting method processing method through a modulator of a video cassette recorder. OSD processing the message to display on the screen; Selecting a desired country-specific broadcasting method through key input means; And switching the modulator to the country-specific broadcast method selected in the selection step, and then processing and outputting the broadcast signal provided from the signal processing means by the switched broadcast method.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

1 is a block diagram showing the configuration of an automatic modulator switching device of a video cassette recorder according to the present invention.

2 is a flowchart illustrating an operation of automatically switching a modulator of a video cassette recorder according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawing

10: key input unit 20: microcomputer

30: memory 40: OSD drive unit

50: signal processing unit 60: modulator

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

1 is a schematic block diagram of an apparatus for automatically switching a modulator of a video cassette recorder according to the present invention, and includes a key input unit 10, a microcomputer 20, a memory 30, and an on-screen display (OSD) driving unit ( 40), the signal processing section 50, and the modulator 60.

In FIG. 1, the microcomputer 20 generates a control signal for displaying a broadcasting method for each country at the time of initializing (initial setting) of a video cassette recorder, while switching the modulator 60 according to the selected country. A control signal is generated, and the memory 30 stores a message for each country's broadcasting method, and the OSD driver 40 stores each country stored in the memory 30 by a control signal for display from the microcomputer 20. OSD method of each broadcasting method is displayed on the screen.

In addition, the key input unit 10 is for selecting a desired country-specific broadcasting method among the country-specific broadcasting methods displayed on the screen by a user's operation, and the signal processing unit 50 is a broadcast signal provided from a tuner (not shown). Is provided to the modulator 60 by signal processing, and the modulator 60 is switched by the switching control signal from the microcomputer 20 to signal process the broadcast signal provided from the signal processing unit 50 according to the corresponding broadcasting scheme.

The flowchart of the operation of the modulator automatic switching method of the video cassette recorder according to the present invention will be described in detail with reference to the configuration of the hardware configured as described above.

First, when the video cassette recorder is initialized (step 210), i.e., when the external power is turned off and switched on again, and commercial power is supplied into the video cassette recorder, the microcomputer 20 stores the memory 30 in the memory 30. It is possible to generate a control signal to display and display a message for each country's broadcasting method, and display a message for each country's broadcasting method stored in the memory 30 by the display control signal from the microcomputer 20. The OSD is processed by the driver 40 and then displayed on the screen (step 220).

Then, when the user sees a message about the broadcasting method for each country displayed on the screen, and selects a desired country or broadcasting method through the key input unit 10, the microcomputer 20 performs a signal processing method of the modulator 60. To generate a control signal for switching to a broadcasting method corresponding to the selection key signal from the key input unit 10.

Therefore, the modulator 60 is switched to the broadcasting method for each country by the switching control signal from the microcomputer 20, and the broadcast signal processed by the signal processor 50 is processed by the modulator 60 in the corresponding broadcasting method. And then output.

As described above, upon initialization of the video cassette recorder, OSD processing is performed on the OSD driver 40 by the display control signal of the microcomputer 20 and displayed on the next screen, and the desired country or broadcasting method is provided through the key input unit 10. If is selected, the switching control signal of the microcomputer 20 is switched to the corresponding broadcast method of the modulator 60, and the broadcast signal provided from the signal processor 50 is signal processed according to the broadcast method.

Therefore, according to the present invention, since the modulator is automatically switched in accordance with the broadcast method selected at the time of initialization of the video cassette recorder, not only the function of the modulator can be selected more easily but also the user's convenience can be achieved. have.

While the invention has been shown and described with respect to certain preferred embodiments, it will be apparent to those skilled in the art that various modifications, changes and omissions can be made without departing from the spirit and scope of the invention.

Claims (1)

As a broadcasting method processing method through a modulator of a video cassette recorder, When the video cassette recorder is initialized, displaying a message on a screen by OSD processing a message of a broadcasting method for each country stored in a memory; Selecting a desired country-specific broadcasting method through key input means; And And switching the modulator to the country-specific broadcast method selected in the selection step, and then processing and outputting the broadcast signal provided from the signal processing means in the switched broadcast method. Switching method.