KR100306515B1 - Method for controlling zoom mode in a TVCR - Google Patents

Abstract

The present invention relates to a zoom mode control method in a TV-C, when a special screen such as a zoom (ZOOM) is set in the playback mode of the TV-CAL and a zoom mode when a QUE / REW key is input. After switching the screen state to 4: 3 normal mode and performing cue / rewind function and returning to playback mode, the 4: 3 normal mode screen state is returned to the zoom mode screen state.

Therefore, when the cue / rewind function is selected in the zoom mode, the screen state is changed to prevent noise output on the screen, and the cue / rewind function can be performed in the normal mode to watch in a stable atmosphere.

Description

Method for controlling zoom mode in TVCR}

The present invention relates to a zoom mode control method in a TV CR, and more particularly, to set a special screen such as a zoom in a playback mode of a TV CR, and to set a cue / rewind. When the key is pressed, the zoom mode screen state is changed to 4: 3 normal mode, and when the cue / rewind function is executed and the player returns to the playback mode, the 4: 3 normal mode screen state is returned to the zoom mode screen state. The present invention relates to a zoom mode control method for a television to be restored.

In general, a television and a VCR are interconnected by a video / audio cable so that in a video mode, a video signal and an audio signal of a video tape read by a VCR are reproduced on a screen of a television. The video and audio signals are reproduced on the television screen. The television and VCR are composed of independent systems, and the video and audio signals are exchanged by the connecting cable. Currently, the video and audio signals of the television and the video and audio signals of the VCR are reproduced and recorded. Mixed image media, so-called televideo (TVCR), are being commercialized. In addition, a TVCR having a function of enlarging and viewing a full screen or a partial screen of a current video screen to be viewed in detail among the video screens being played is commercially available.

Hereinafter, a partial screen enlargement method according to the related art will be described with reference to the accompanying drawings.

1 is a flowchart illustrating a conventional partial screen enlargement method.

When the partial enlargement command is input through the key input unit in step S101, the microcomputer proceeds to step S102 to control the function of the system to be temporarily stopped while the currently playing screen is displayed. Accordingly, the video output unit displays the playback screen at the time when playback is stopped as a still picture.

The microcomputer then proceeds to step S103. In step S103, the microcomputer controls the OSD processing unit to generate a grid having a predetermined size for the still image displayed through the image output unit. When the screen grid is generated, the microcomputer proceeds to step S104 to determine the grid size to be enlarged. That is, when the user views the grid displayed through the image output unit and the user applies a value (Left-Top, Right-Bottom) for the grid to be enlarged through the key input unit, the microcomputer receives the applied (Left-Top, Right-Bottom). Analyze the values and compare the number of horizontal and vertical grids. As a result of the comparison, the grid size determination step is performed by selecting the larger grid number to calculate the magnification ratio and extracting the output Left-Top value so that the enlarged screen can be displayed centered on the screen using the calculated magnification ratio. .

When the overall size for the enlargement of the predetermined grid to be enlarged is determined, the microcomputer proceeds to step S105 to perform windowing on the pixel data in the selected grid. In step S106, the pixel data windowed is enlarged according to the enlargement ratio determined in step S104, and stored in the DRAM (Dynamic RAM). In other words, the pixel data windowed at step S105 is enlarged twice and stored in the DRAM of the microcomputer's RAM. In operation S107, the enlarged pixel data stored in the DRAM is transferred to the image output unit through a moving picture expert group (MPEG) decoder, a video signal processor, and an OSD processor to be displayed.

The position of the enlarged screen displayed on the image output unit is determined by the output Left-Top value extracted in step S104. That is, the microcomputer controls the operation of the OSD processing unit by using the above-described output Left-Top value so that the enlarged screen is displayed at the center of the screen.

After the enlargement of the desired partial screen, if a command (play key) for controlling the play mode is applied from the key input unit, the microcomputer proceeds to step S109 to release the pause mode for the play screen set in step S102, Subsequently, the servo unit is controlled to perform normal playback.

In the conventional partial screen enlargement method, the user can enlarge the desired screen and watch it in detail, but when the user selects the cue / rewind key in the zoom mode screen state, the screen state is not smooth and noise is output. There is a problem to watch.

The present invention has been made to solve the conventional problems as described above, an object of the present invention is to set a special screen, such as zoom (ZOOM) in the playback mode of the TV (TVCR), and cue / rewind (QUE / When the REW) key is pressed, the zoom mode screen state is changed to the 4: 3 normal mode screen state, and when the cue / rewind function is performed and the user returns to the playback mode, the 4: 3 normal mode screen state is displayed. The present invention provides a method of controlling a zoom mode in a television that returns to a state.

Another object of the present invention is to change the screen state when selecting the cue / rewind function in the zoom mode to prevent the noise output on the screen in advance, and to perform the cue / rewind function in the normal mode screen state to be able to watch in a stable atmosphere It is to provide a zoom mode control method in TV.

1 is a flowchart illustrating a conventional partial screen enlargement method.

Figure 2 is a schematic block diagram of a zoom mode control method for TV in accordance with the present invention.

3 is a flowchart illustrating a method of controlling a zoom mode in a television according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

20: Tuner 21: Medium frequency circuit section

22: image signal processing unit 23: OSD processing unit

24: microcomputer 25: key input unit

26: normal mode 27: inverter

28: zoom mode unit 29: function operation unit

According to the present invention for achieving the above object, when it is determined that the play key is input by the key signal of the key input unit 25, the play function is performed in the normal mode screen state with an aspect ratio of 4: 3, and other keys other than the play key. Performing a function corresponding to each key signal when it is determined that is inputted; Determining whether the zoom function is set in the normal mode, if the zoom function is not set, performing the previous function as it is, and if the zoom function is set, enlarging the screen to the zoom mode screen state; If the cue / rewind key signal is not input in the zoom mode screen state and the cue / rewind key signal is not input, the previous function is performed in the zoom mode screen state.If the cue / rewind key signal is input, the aspect ratio is 4: 3. Performing a cue / rewind function in a normal mode screen state of the camera; If the microcomputer 24 determines that the cue / rewind function has not been completed, it waits until the function execution is completed. If it is determined that the cue / rewind function has been completed, the normal mode screen state of aspect ratio 4: 3 is displayed in the zoom mode screen state. Switching to performing the previous function; consists of.

In addition, the step of switching from the normal mode screen state of the aspect ratio 4: 3 to the zoom mode screen state may determine whether the function execution is completed by the microcomputer 24, and if the function execution is not completed, the microcomputer 24 generates a high signal. Outputting a low signal when the function execution is completed; When the high signal is output from the microcomputer 24, the normal mode unit 26 is driven to perform a function in the normal mode screen state with an aspect ratio of 4: 3. When the low signal is output, the zoom mode unit 28 is driven to zoom. It becomes a mode screen state and performs a function.

Hereinafter, a preferred embodiment of a zoom mode control method in a TVAL according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic block diagram of a zoom mode control method for a television in accordance with the present invention.

The tuner 20 is connected to the antenna ANT and picks up a broadcast signal transmitted from a broadcasting station through the antenna ANT, and the tuner 20 is a channel to be received in some television radio waves coming from the antenna ANT. Selected and amplified television signals are frequency-converted to 45.75 MHz for video and 41.25 MHz for audio. Television radio is divided into the VHF band (2-13 channels) and the UHF band (14-83 channels), and because the frequencies are far apart, the circuit is divided for the VHF and UHF.

The intermediate frequency circuit portion 21 is connected to the tuner 20 and converts the data transmitted from the tuner 20 and outputs it as a video signal and an audio signal. The intermediate frequency circuit portion 21 has a 45.75 MHz video signal and 4.5 more than that. The low 41.25 MHz voice mid-frequency signal is amplified together. In the case of amplifying two signals of different types in one circuit, if the two signal levels are about the same, the bit signal, which is the frequency difference between the two signals generated from the detection circuit, is also large and appears as a bit pattern on the screen. Therefore, the voice intermediate frequency signal is amplified by lowering to a level that does not affect the screen. Even if a television signal of an adjacent channel other than an audio signal is mixed, it appears as a fringe on the screen, and in order to suppress these signal levels, some kinds of traps are provided in the input / output circuit of the amplifier circuit. The audio signal is extracted before attenuation in the trap circuit at 41.25 MHz at the end of the intermediate frequency amplifier circuit.

The image signal processing unit 22 is connected to the intermediate frequency circuit unit 21 and converts the image signal of the intermediate frequency circuit unit 21 into an R (Red) G (Green) B (Blue) signal and converts the converted signal into a composite image signal. Reconvert and output to the water pipe (CRT). Since the composite video signal includes a luminance signal, a carrier color signal, and a combination of a synchronization signal and a color burst signal, the image signal processor 22 amplifies the luminance signal among these signals to about 150V and applies it to the cathode of the color receiving tube. At the same time, the carrier color signal is transmitted to the color reproduction circuit and the synchronization signal to the synchronization circuit.

The OSD processor 23 performs on-screen display processing of OSD signals for displaying OSD characters, and the microcomputer 24 is interconnected with the image signal processor 22 and controls smooth performance of each component. The key input unit 25 transmits key signals attached to the main body of the television and the rerocon to the microcomputer. Reference numerals 25a, 25b, 25c, 25d, and 25e denote TV power key, VCR power key, playback key, zoom setting key, and cue / rewind key, respectively.

The normal mode unit 26 is connected to the microcomputer 24 and displays the screen with the aspect ratio 4: 3 by the output signal of the microcomputer 24. The inverter 27 is connected to the microcomputer 24 and inverts the output signal of the microcomputer 24, and the zoom mode unit 28 is connected to the inverter 27 and enlarges the screen state. In addition, the function operation unit 29 is connected to the normal mode unit 26, the zoom mode unit 28 and the microcomputer 24, and corresponds to a key signal transmitted from the key input unit 25 under the control of the microcomputer 24. It performs the function. The operation function unit 29 performs a function in a screen state with an aspect ratio of 4: 3 when the normal mode unit 26 is driven, and performs a function in an enlarged screen state when the zoom mode unit 28 is driven. . If the output signal of the microcomputer 24 is a high signal, the normal mode unit 26 is driven and the zoom mode unit 28 is not driven because the low signal is inputted by the inverter 27. On the contrary, the output signal of the microcomputer 24 is reversed. If is a low signal, the normal mode unit 26 is not driven and the zoom mode unit 28 is inverted to a low signal by the inverter 27 to drive.

The operation state of the zoom mode control method in the TV-type according to the present invention as described above is as follows.

3 is a flowchart illustrating a method of controlling a zoom mode in a television according to the present invention.

The microcomputer 24 receives the power key 25a, 25b signals transmitted from the key input unit 25 to determine whether the TV and the VCR are on / off (S301, S302). If it is determined that the TV and the VCR are in the off state, the process proceeds to step S315 to be described later. If it is determined that the TV and the VCR are in the on state, it is determined whether the play key 25c signal of the key input unit 25 is input (S303). ). As a result of determination, when a key signal other than the play key 25c is input, a function corresponding to each key signal is performed (S304). When the play key 25c is input, the microcomputer 24 outputs a high signal to output the normal mode. (26) is instructed to perform the playback function in the normal mode screen state with an aspect ratio of 4: 3 (S305). At this time, the zoom mode unit 28 is inverted to a low signal by the inverter 27 and thus does not operate.

Next, the microcomputer 24 determines whether the zoom setting key 25d signal of the key input unit 25 is input while the playback function is being performed (S306). As a result of the determination, if the zoom setting key 25d signal is not input, the process proceeds to step S303, and the above steps are repeatedly performed. When the zoom setting key 25d signal is input, the microcomputer 24 outputs a low signal and the inverter 27 Inverted to a high signal by the zoom mode unit 28 operates to perform a playback function in the enlarged screen state (S307). At this time, the normal mode unit 26 does not operate because a low signal is input.

The microcomputer 24 determines whether the cue / rewind key 25e signal of the key input unit 25 is input while the zoom mode is being executed (S308). The cue / rewind key 25e is a key for instructing to perform a function of searching the picture in the forward or reverse direction. If it is determined that the cue / rewind key 25e signal is not input, the process proceeds to step S307, and the above steps are repeatedly performed. When the cue / rewind key 25e signal is input, the microcomputer 24 outputs a high signal. Since this high signal is inverted to a low signal by the inverter 27, the operation of the zoom mode unit 28 is stopped, and the normal mode unit 26 operates to display the screen state of the zoom mode in the normal mode screen with an aspect ratio of 4: 3. In operation S309, the function operation unit 29 performs a cue / rewind function in the normal mode screen state of the aspect ratio 4: 3.

The microcomputer 24 connected to the function operation unit 29 checks the state of function performance to determine whether the function operation unit 29 has completed the queue / rewind function (S310). As a result of the determination, if the cue / rewind function is not completed, the microcomputer 24 continuously outputs a high signal to instruct to perform the function in the normal mode screen state. If the cue / rewind function is completed, the microcomputer 24 outputs a low signal. By outputting, the operation of the normal mode unit 26 is stopped and the zoom mode unit 28 is operated to return the function prior to performing the cue / rewind function to the zoom mode (S311).

Further, the microcomputer 24 determines whether the play key 25c of the key input unit 25 has been input (S312), and if the play key 25c is input as a result of the determination, the microcomputer 24 proceeds to step S305 and plays back to the normal mode. If the play key 25c is not inputted, the previous function is performed while it is determined whether the VCR power key 25b is input (S313). If it is determined that the VCR power key 25b signal is not input, the process proceeds to step S303 and the above steps are repeated. When the VCR power key 25b signal is input, the VCR power is turned off to perform the TV function (S314). ). The microcomputer 24 determines whether the input signal of the TV power key 25a is input (S315). If the signal of the TV power key 25a is not input, the microcomputer 24 proceeds to step S302 and repeats the above steps. 25a) When the signal is input, the TV is turned off to end the operation.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of application of the present invention is not limited to these, and may be appropriately changed within the scope of the same idea. For example, the shape and structure of each component specifically shown in the embodiment of the present invention can be modified. In addition, the present invention can be widely used in various ways.

As described above, according to the zoom mode control method of the TV according to the present invention, when the cue / rewind function is to be set during the zoom mode, the zoom mode screen state is set in the normal mode screen state with an aspect ratio of 4: 3. By performing the rewind function, it is possible to perform the cue / rewind function with a clear screen without noise.

Claims (2)

If it is determined that the playback key is input by the key signal of the key input unit 25, the playback function is performed in the normal mode screen state with an aspect ratio of 4: 3, and if it is determined that other keys other than the playback key are input, Performing a corresponding function; Determining whether the zoom function is set in the normal mode, if the zoom function is not set, performing the previous function as it is, and if the zoom function is set, enlarging the screen to the zoom mode screen state; If the cue / rewind key signal is not input in the zoom mode screen state and the cue / rewind key signal is not input, the previous function is performed in the zoom mode screen state.If the cue / rewind key signal is input, the aspect ratio is 4: 3. Performing a cue / rewind function in a normal mode screen state of the camera; If the microcomputer 24 determines that the cue / rewind function has not been completed, it waits until the function execution is completed. If it is determined that the cue / rewind function has been completed, the normal mode screen state of aspect ratio 4: 3 is displayed in the zoom mode screen state. Performing a previous function by switching to the; consisting of a zoom mode control method in the TV. The method of claim 1, wherein the step of switching from the normal mode screen state of the aspect ratio 4: 3 to the zoom mode screen state Determining whether the function execution is completed by the microcomputer 24, and if the function performance is not completed, the microcomputer 24 outputs a high signal, and outputs a low signal when the function performance is completed; When the high signal is output from the microcomputer 24, the normal mode unit 26 is driven to perform a function in the normal mode screen state with an aspect ratio of 4: 3. When the low signal is output, the zoom mode unit 28 is driven to zoom. Zoom mode control method in the TV-seal, characterized in that consisting of; and performing a function in a mode screen state.