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Method of signal mode identification and setting method of ADC parameter

A signal mode and parameter technology, applied in the direction of image communication, color TV parts, TV system parts, etc., can solve the problems of long recognition time, slow speed, difficult to guarantee image display quality, etc., to achieve image quality Good, tolerance-enhancing effect

Inactive Publication Date: 2004-10-20
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology

There are two main problems in such a recognition method: one is to compare one by one, the speed is slow, and the recognition time is long; the other is to artificially set a commonly used approximate signal mode, and the image display quality is difficult to guarantee
However, in reality, there are often many low-end graphics cards that output signals that are not standardized enough. If ADC parameters are applied blindly, it will cause problems such as poor image display.

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  • Method of signal mode identification and setting method of ADC parameter
  • Method of signal mode identification and setting method of ADC parameter
  • Method of signal mode identification and setting method of ADC parameter

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Embodiment Construction

[0019] For the image signal mode table settings are as follows:

[0020] ●MODE INDEX (BYTE): form the index serial number of the mode table;

[0021] ●HPER(WORD): stands for row frequency;

[0022] ●VTOTAL (WORD): represents the total number of line synchronization in each field, and can be used to calculate the field frequency with HPER;

[0023] ●HTOTAL(WORD): the total number of pixels in each row;

[0024] ●HRES(WORD): the total number of pixels in the active interval of each row;

[0025] ●VRES (WORD): the total number of line synchronization in each active interval;

[0026] ●VDS(WORD): the starting position of the line in each field activation interval;

[0027] HDS (WORD): the starting position of the pixel in the active interval of each row;

[0028] ●PRFLAG(BYTE): automatic processing flag;

[0029] i.INTERLACED(BIT): whether the input signal is interlaced;

[0030] ii.HPOLARITY(BIT): line synchronization polarity of input signal;

[0031] iii.VPOLARITY(BIT):...

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Abstract

Sorting and searching parameter values of key mode of input image signal are carried out for mode table so as to identify signal mode with accuracy and quickly. After mode of analog image signal is recognized, in procedure of D / A conversion, frequency dividing ratio of pixel clock GCLK, PLL is modified again based on HTOTAL. Thus, D / A conversion is accorded with actual signal even more. The invention is suitable to automated mode recognition in liquid crystal product, PDP and HDTV digital flat panel display adapted to analog and digital signal in multiple formats.

Description

technical field [0001] The present invention relates to a method for signal pattern recognition and a method for setting ADC parameters, in particular to a method for image display signal pattern recognition, and a method for setting ADC parameters for analog image display signals after pattern recognition. technical background [0002] When a new signal is input to the image digital processing system, its signal mode, such as horizontal and vertical resolution, is unknown to the entire image digital processing system, but to display the image signal correctly, it must Identify its signal pattern. The current practice is generally to start with the horizontal / field synchronous signal, calculate some parameters of the image signal mode, and then compare these parameters one by one with the parameters specified in the industry's general standards. If there is a complete match, it will be regarded as the correct signal. mode, if no exact match is found, set a commonly used app...

Claims

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Application Information

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IPC IPC(8): H04N5/44H04N7/01H04N17/00
Inventor 丁松平莫烨
Owner SICHUAN CHANGHONG ELECTRIC CO LTD