KR960002809Y1 - Screen expansion apparatus - Google Patents

Abstract

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Description

Screen magnifier

1 is an illustration of a CD image

2 is a block diagram of a conventional screen magnification apparatus.

3 is an exemplary view of a screen according to a conventional horizontal synchronization

4 is a block diagram of the screen magnification device of the present invention

5 is a detailed circuit diagram of a timing generator in FIG.

6 is a waveform diagram according to the timing of the present invention

* Explanation of symbols for main parts of the drawings

1,11 deck 2,12 high frequency amplifier

3,13: digital signal processor 4,14: Algibee decoder

5,15: Algibi encoder 6,16: video switch

17: video output controller 18: analog / digital conversion unit

19: memory 20: digital / analog converter

21: Counter FF1: J.K flip-flop

AN1, AN2: Endkate

The present invention relates to a screen magnification device, and more particularly, to a screen magnification device for displaying an image on the entire CRT by extending the data on the time axis because the screen is not filled with the CRT when the original video signal is small. .

2 is a block diagram of a conventional screen expansion apparatus, as shown therein, a deck 1 for reading signals from a CD board, and a high frequency amplifier 2 for amplifying the output of the deck 1 to a predetermined level. A digital signal processor 3 for digitally processing the output of the high frequency amplifier 2, an Algib decoder 4 for encoding the output of the digital signal processor 3 into a primary color signal RGB, It is composed of an algibi encoder 5 which outputs the output of 4) after encoding the luminance and chromaticity, and an image switching unit 6 which swarms the output of the algibi encoder 5 and outputs it to a color CRT. Referring to the operation of the conventional device as follows.

As the deck 1 detects the image high frequency recorded on the CD board, when the high frequency amplifying unit 2 amplifies to a predetermined level, the digital signal processing unit 3 performs digital processing such as filtering of the mixed noise. The RGB decoder 4 that receives the output of the digital signal processor 3 outputs an image color signal RG B through decoding.

Here, the CDG image data contains graphic information, which is composed of 50 × 50 (Hor × Vert) fonts as shown in FIG. 1, and one font is 6 × 12 (Hor ×). Vert) pixel.

At this time, the Algivy encoder 5 which receives the output of the Algivy decoder 4 outputs an image color signal to the image switching unit 6 as it encodes by processing luminance and chromaticity.

Accordingly, the video switching unit 6 switches the video signal and the audio signal during the output of the Algivy encoder 5 to output the audio to the speaker (not shown) and display the image on the screen of the color CRT (not shown). It is done.

At this time, the image displayed on the screen of the color CRT (not shown) shows only the screen area of 48 × 16 font among the original 50 × 18 font on the screen. Used to move.

However, since the image color signal RGB, which is the output of the Algivy decoder 4, has no image signal at the front and rear portions as shown in FIG. As shown in (b), there was a problem that the traffic is smaller than the image.

In addition, the conventional device operates at a high frequency of 15.75Khz and supplies a high voltage to the flyback transformer, so that when the current value of the horizontal coil changes, the voltage of the flyback transformer changes, so that the beam current of the color CRT changes and the screen As well as the brightness of the change in the horizontal size of the circuit is difficult to reduce the reliability of the product.

In order to solve this problem, the present invention provides a screen magnification apparatus that enlarges / reduces the horizontal size of the screen by changing the frequency of the write clock and read clock of the memory as the effective image data area is detected based on the horizontal synchronization signal. The present invention is described in detail with reference to the accompanying drawings.

4 is a block diagram of the screen magnification device of the present invention, as shown therein, a deck 11 for reading out a signal from a CD board and a high frequency amplifier 12 for amplifying the output of the deck 11 to a predetermined level. A digital signal processor 13 for digitally processing the output of the high frequency amplifier 12, an Algivy decoder 14 for decoding the output of the digital signal processor 13 into a primary color signal RGB; And an image output control unit 17 for storing and outputting the output of the AlGiB decoder 14 in accordance with a timing signal, and encoding and outputting the output of the image output control unit 17 after processing luminance and chromaticity. A coder 15 and an image switching unit 16 for swarming the output of the Algivy encoder 15, wherein the image output control unit 17 writes a write clock WCK based on a horizontal synchronization signal Hsyn. ) And a timing generator 21 for outputting the read clock RCK, and the timing generator The analog / digital conversion unit 18 for digitally converting the output of the Algivy decoder 14 according to the write clock WCK of the generation unit 21, and the write clock WCK of the timing generator 21. The memory 19 for storing the output of the analog / digital conversion section 10 and outputting the output according to the read clock RCK and the output of the memory 19 according to the read clock RCK of the timing generator 21 are described. It consists of the digital / analog conversion part 20 which performs analog conversion.

As shown in FIG. 5, the timing generator 21 counts a predetermined frequency (14.33Mhz) based on the horizontal synchronizing signal hSYN, and predetermined output of the counter 12. An AND gate AN1 that logically multiplies a reference value 148, an AND gate AN2 that logically multiplies the output of the counter 12 by a predetermined reference value 762, and an output of the AND gate AN1 AN2 is input. The flip-flop FF1 controls the write clock WCK output to the memory 9 as it is set / reset as (J) (K).

The operation and effect of the screen magnification device constructed as described above will be described in detail with reference to the waveform diagram according to FIG.

As the tech 11 detects the image high frequency recorded on the CD board, when the high frequency amplifying unit 12 amplifies to a predetermined level, the digital signal processing unit 13 performs digital processing such as filtering of the mixed noise. The RGBI decoder 14 which receives the input / output power of the digital signal processor 13 outputs the image color signal RGB through decoding.

Here, the graphic information is stored in the CDG image data, which is composed of 50 × 18 (Hor × Vert) fonts as shown in FIG. 1, and one font is 6 × 12 (Hor ×). Vert) pixel.

At this time, the image output control unit 17 which receives the color signal RGB which is the output of the Algivy decoder 14 has a counter 22 at the timing generator 21 with a predetermined frequency (14.33) on the basis of the horizontal synchronizing signal Hsyn. As the counting Mhz), the AND gate AN1, which receives the output of the counter 22, is logically multiplied with the predetermined reference value 148 to obtain a high potential in the horizontally synchronized portion (when the count value is 148 (= 1010100)). The WK is enabled by setting the JK flip-flop FF1 to enable the write clock WCK to enable the write operation of the memory 19 and the output of the counter 22 to the gate AN2 by a predetermined reference value 762. ) And the write clock WCK is disabled by outputting a fixed point at a portion having no horizontal synchronization (when the coefficient value is 762 (= 111111010)) and resetting the JK flip-flop FF1. Disable write operations in 19).

Accordingly, the image output control unit 17 converts the digital output of the AlGeB decoder 14 into 14.33Mhz, which is the output of the timing generator 21, and converts the output of the AlGeB decoder 14 into digital memory. ) Stores the output of the analog / digital converter 18 by the tight clock WCK of the timing generator 21 and when the write operation of the memory 19 is completed, the timing generator 21. Disables the write clock WCK and at the same time enables the read clock RCK.

Here, the timing generator 21 resets the count value based on the horizontal synchronizing signal Hsyn as the counter 22 counts a predetermined frequency (14.33Mhz) based on the horizontal synchronizing signal Hsyn. 19) stores 910 sampled CD image signals which are one horizontal synchronization image signal for each horizontal registration signal Hsyn.

That is, when the analog / digital conversion unit 18 samples the output of the AlGeeB decoder 14 at a frequency of 14.33Mhz, the one horizontal vent signal Hsyn is 15.75Mhz. 910 ".

Sampling rate of 1H = 14.33Mhz / 15.75Mhz = 910

At this time, as the output of the AlGiB decoder 14 is analog-converted at a frequency of 14.33Mhz, which is the output of the timing generator 21, 910 data are sampled for each horizontal sync signal HSyn as shown in the fourth, and the memory 19 In this case, since the original CD image data is 614, the timing generator 21 outputs a lead clock (RCK) of 10 MHz by the following equation.

910: 14.33Mhz = 614: x

x = 14.33Mhz × 614 / 15.75Mhz

= 9.7Mhz 10 MHz

Accordingly, when the memory 19 outputs the stored data according to the read clock RCK of 10 Mhz of the timing generator 21, the digital / analog converter 20 may output 10 MHz of the output of the timing generator 21. The output of the memory 19 is analog-converted according to the frequency and output to the Algivy encoder 15.

Accordingly, the ALGB encoder 15 outputs an image color signal to the image switcher 16 as the encoder outputs the image output controller 17 by processing luminance and chromaticity, and the image switcher 16 outputs the image switch. By switching the video signal and the audio signal during the output of the encoder 15, the audio is output to the speaker (not shown) and the image is displayed on the screen of the color CRT (not shown).

Here, 614 pieces of actual CD image data are displayed on the TV screen as the frequency of the read clock RCK is changed.

As described in detail above, the present invention improves the horizontal size of the screen by improving the horizontal size of the horizontal deflection unit. It has the effect of expanding reliably.

Claims (3)

Deck 11 for detecting a video image signal, a high frequency amplifier 12 for amplifying the output of the deck 11 to a predetermined level, and a digital signal processor for digitally processing the output of the high frequency amplifier 12 (13), an AlGiB decoder 14 which decodes the output of the digital signal processing unit 13 into a primary color signal RGB, and a horizontal synchronous signal Hsyn that counts the output of the RGB decoder 14; The video output controller 17 stores and outputs the light clock WCK and the read clock RCK in comparison with a predetermined reference value, and encodes the output of the video output controller 17 after luminance and chromaticity. And an image switching unit (16) for switching the video signal and the audio signal which are the outputs of the Algibi encoder (15). The image output control unit 17 according to claim 1, wherein the image output control unit 17 adjusts and outputs the frequencies of the write clock WCK and read clock RCK based on the horizontal synchronizing signal Hsyn, and generates the timing. The analog / digital converter 18 for digitally converting the output of the Algivy decoder 14 according to the write clock WCK of the unit 21 and the analog clock according to the write clock WCK of the timing generator 21. The output of the memory 19 storing the output of the digital converter 18 and the memory 19 outputting according to the read clock RCK of the timing generator 21 is read by the timing generator 21. An enlargement apparatus comprising: a digital / analog converter (20) for analog conversion in accordance with a clock (RCK). The timing generator 21 includes a counter 12 that counts a predetermined frequency (14 33 MHz) based on the horizontal synchronization signal HSYN, and outputs the counter 12 by a predetermined reference value 148. ), An AND (AN1) logically multiplying by < RTI ID = 0.0 >) < / RTI > And a JK flip-flop (FF1) for controlling the write clock (WCK).