RU96118362A - DEVICE AND METHOD FOR AUTOMATIC ADJUSTMENT OF PICTURE SIZE IN VIDEO SYSTEM - Google Patents

Claims (5)

1. Device for automatically adjusting the image size in a video system, characterized in that it contains a microcomputer for receiving a manually input user input signal and a horizontal frequency and a vertical frequency, for generating first data and second data representing respectively the horizontal image size and the vertical image size moreover, the ratio of the first data to the second data is equal to a constant value, an analog-to-digital converter for converting into a digital code o the biasing voltage determining the horizontal image size, and for outputting third data representing the measured horizontal image size to the microcomputer, means for controlling the horizontal image size included between the microcomputer and the analog-to-digital converter, and receiving the first data, means for controlling the vertical image size and receiving second data and means for determining the horizontal frequency and converting the horizontal frequency to the corresponding voltage a solution for generating fourth data equal to the third data for the microcomputer, wherein said determining means is included between the horizontal image size control means and the microcomputer.  2. The device according to p. 1, characterized in that the microcomputer contains a first memory device for storing data representing the electrical characteristics of the video system, means for calculating data stored in the first memory device, for generating fifth data representing the horizontal image size of the video system, received from the outside horizontal frequency, means for comparing third and fourth data with fifth data to obtain sixth data representing a horizontal image size, adjustable by the video system itself, means for generating seventh data representing a horizontal image size and a control signal, and for receiving a user input, a second memory device for storing sixth data in accordance with a control signal, a first buffer means with three states, which in accordance with a control signal turns on / off in one direction, the second buffer means with three states, which in accordance with the control signal turns on / off in both directions ia, a means of storing eighth data representing the vertical size of the image of the video system in accordance with the vertical frequency, and to increase / decrease the value of the data stored in it until the indicated ratio becomes constant and to generate second data for the means of controlling the vertical image size, the first mixing for mixing sixth data with seventh data and second mixing means connected to the first mixing means for mixing sixth data with eighth data in response to "Activation" of the first and second buffer means of tri-state and to increase / decrease the data mixed therein until the ratio becomes constant, and for generating first data for a horizontal image size control means. 3. The device according to claim 2, characterized in that the fifth data is calculated from the following expression:
Ih _pp xLh / T _S xk = D1,
where Ih _pp is the deviating current of the video system;
Lh is the inductance of the deflecting coil of the video system;
k is a constant determined by the horizontal frequency;
D1 is the fifth data representing the horizontal size of the image;
T _S is the temporal function of the horizontal frequency, determined by the ratio T _S = (1 / horizontal frequency) is the duration of the blanking interval.  4. A method for automatically adjusting the image size in a video system having a microcomputer receiving horizontal and vertical frequencies, for generating first and second data representing respectively the horizontal and vertical sizes of the image, and storage means for storing the first and second data, characterized in that it includes the following operations: (a) comparing third data representing the horizontal image size of the video system, which is calculated based on the stored data the tertiary characteristics of the video system, with fourth data representing the horizontal image size of the video system, measured by one of the deflecting voltage and frequency-voltage converters, and a horizontal frequency counter, and then determining whether the third data is equal to the fourth data or not, (b) if the third data is equal to the fourth data, then storing the fifth data representing the horizontal image size adjustable by the video system itself, then reading the sixth data representing the vertices total image size, and mixing fifth data with sixth data, (c) determining whether the ratio of fifth data to sixth data is constant, (d) if this ratio is constant, then storing the first data and second data in the video system, (e) if the third data is not equal to the fourth data in step (a), then increase / decrease the first data so that the third data matches the fourth data and perform operation (b), and (f) if this ratio is constant in step (c), then increase / decrease of the second data to bring e CSO relations to a constant value, and the operation (d).  5. A method for automatically adjusting the image size in a video system, characterized in that it includes the following operations: (a) when the user signal is input, terminating the automatic image adjustment operation of the video system and (b) after stopping the adjustment operation, mixing the first data representing the horizontal image size, entered by the user, with the second data representing the horizontal image size, adjusted and stored in the video system, the formation of the third data, using used as a control signal of the horizontal image size, and increase / decrease of third data, as a result of which the horizontal image size of the video system is automatically adjusted.