KR970028962A - A video interface device and a video interface method enabling connection of a normal video device with a PC - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a video interface device that enables a connection between a conventional video device and a PC. In particular, the frequency and level of a video signal used in a typical video device (TV, VCR, camcorder, etc.) The present invention relates to a video interface device and a video interface method for converting to a level so that an image to be displayed on a normal video device can be output on a screen of a PC.

Conventionally, since the signal systems (frequency and level) used in ordinary video equipment and the signal systems used in a PC are different from each other, there is a problem that the use range of the video equipment is limited, for example, the normal video equipment cannot be connected to a PC. there was.

Accordingly, the present invention for solving the above problems is to convert the frequency and level of the video signal used in the normal video device (TV, VCR, camcorder, etc.) to match the frequency and level of use of the PC to the normal video device It is a video interface device and video interface method that can be connected to a PC.

Description

A video interface device and a video interface method enabling connection of a normal video device to a PC

As this is a public information case, the full text was not included.

3 is a block diagram showing the configuration of a video interface device of the present invention;

4 is a flowchart showing a control process of the video interface device of the present invention;

5 is a block diagram showing an embodiment of the present invention.

Claims (6)

In a conventional video device, a switching unit 21 for switching so as to supply an input luminance signal Y and a color signal C to a normal video device or a PC according to an external key input, and the switching unit 21. The color separation unit 22 which separates the color signal C supplied according to the switching operation of the signal into R, B color signals, the luminance signal Y supplied by the switching unit 21 and the color separation unit ( A frequency converter 23 for converting the frequency of the R and B color signals outputted from 22 into a frequency used by a PC, and generating a clock of a predetermined frequency for controlling the frequency conversion operation of the frequency converter 23; The level generator 25 converts the level of the luminance signal Y and the color signal C frequency-converted by the clock generator 24 and the frequency converter 23 into a level used by the PC, and supplies them to the PC. Connection of a normal video device and PC (PC), characterized in that consisting of Image interface device which enables. A switching step of switching the video signal to be supplied to a normal video device or a PC according to the input of the switching control key, and a color separating the color signal C from the video signal supplied to the PC in the switching step into R and B color signals. A frequency conversion step of converting the luminance signal Y of the image signal supplied in the signal separation step and the switching step and the frequency of the separated R and B color signals into a frequency used in a PC; And a level converting step of converting the levels of the luminance signal (Y) and the R and B color signals into a level used in a PC. In a conventional video device, a switching unit 31 for switching and supplying an input luminance signal Y and a color signal C to an ordinary video device or a PC according to an external key input, and the switching unit 31 The color separation unit 32 which separates the color signal C supplied according to the switching operation of the signal into R, B color signals, the luminance signal Y supplied by the switching unit 31 and the color separation unit ( A frequency converter 33 for converting the frequency of the R and B color signals outputted from 32 into a frequency used by a PC, and generating a clock of a predetermined frequency for controlling the frequency conversion operation of the frequency conversion number 33; A clock generator 34, a level converter 35 for converting the levels of the luminance signal Y and the color signal C frequency-converted by the frequency converter 33 into a level used by the PC; And a frequency of the video signal supplied from the level converter 35 The first controller 36 outputs a control signal for determining whether the level is correctly converted and reduces an error when the error occurs, and the clock generator 34 outputs the control signal according to the control signal output from the first controller 36. And a second control unit 37 for varying the frequency of the clock to be controlled and controlling the level converting operation of the level converting unit 35. . The clock generator 34 divides an oscillator 341 for oscillating a clock of a predetermined frequency (54 MHz) and a clock of a predetermined frequency output from the oscillator 341 at a set ratio. Switching operation according to the plurality of dividers A1 to AN and control signals of the second control unit 37 to select one of the output signals of the dividers A1 to AN to the frequency converter 33. A video interface device that enables connection between a normal video device and a PC, comprising a switch 342 for supplying. A switching step of switching the video signal input according to the input of the switching control key to a normal video device or a PC, and separating the color signal C among the video signals supplied to the PC in the switching step into R and B color signals. And a frequency / level conversion step of converting the luminance signal Y of the video signal supplied in the switching step and the frequency and level of the separated R and B color signals according to an initial set value. A frequency / level comparison step of detecting the frequency and level of the image signal converted in the level converting step and comparing the frequency and level used in the PC; and if a certain error is detected as a result of the comparison, the error of the detected frequency and level Normal zero is characterized in that the progress to the frequency / level correction step for correcting the frequency and level changes in the frequency / level conversion step Image interface method for enabling the connection of the device and the PC (PC). 6. The method of claim 5, wherein in the frequency / level correction step, the frequency correction is performed by varying the frequency of the clock output from the clock generator 34, and the level correction is performed by adjusting the gain of the level converter 35. A video interface method that enables connection of a normal video device and a PC. ※ Note: The disclosure is based on the initial application.