TV test card on the whole is divided into seven kinds, including: PM5544 Electronic great circle, EBU, advertising, SMPTE, GB2097, PM5549. Which GB2097 and PM5549 is a relatively old-fashioned test card, now rarely used in mainstream television. Most stations use the PM5544 Electronic great circle and the EBU TV test card.

friends that like to watch TV is no stranger to this a few pictures on the cover right? ! I remember I was young, every Tuesday afternoon television most of the channels will become the look of this a few pictures, some channel playing “old-fashioned music, drives me crazy, many people’s first reaction is definitely turning off the TV . In fact, this picture is called the TV test card, the function is used to help the user to adjust the TV screen TV showing most standard colors and the clearest images. The following author details the specific application of these TV test card.

EBU is composed of eight kinds of Levels test pattern, the general background sound silencer sound. Many local television stations in the repair and maintenance of the channel will broadcast it. The user can debug the TV’s brightness according to its eight kinds Levels, saturation, color temperature, contrast, and ultimately to calibrate the TV color to improve the color when watching the TV screen authenticity.

PM5544 is more common as a television test card, had served as the test card of CCTV, the first major local stations in the main test card. It is mainly divided into five parts, a total of nine kinds of tests and signs and signals its central great circle. Details please turn to the next page.

1, black and white rectangular retaining border which is used to adjust the line, the center of the magnitude of the field scanning and image. The aspect ratio of the test pattern and color TV screen is also 4:3, it can be used to check the TV aspect ratio, vertical border to check the sync separator and clamp.
duplex white grid background in nursing within the bounding box, in addition to the great circle graphics and outside the circle around the rectangle color signal, are the white lines on the gray background grid pattern. 13 grid its horizontal direction, vertical direction for the 17 grid, the gray background brightness of 30 percent of black to white, it can check the geometric distortion, nonlinear distortion, dynamic convergence and color purity and other characteristics.
round, used to check the geometric distortion and nonlinear distortion.
4, circle signal.
5, respectively, on the circle around the test pattern of color signals outside the box, the four corners of a box, each with a certain degree of brightness and color saturation value. Used to check the color decoder performance.

1, a TV station logo, indicating that the Chinese people’s standard color available to adjust the TV hue, color saturation and brightness test.
Black Bai Fangbo, used to check the transient response of the TV luminance channel.
, color signals, it makes the overall impression of color television viewers, and to adjust the hue and saturation, can also check the TV automatically achromatic circuit is normal.
white center cross lines, used to determine the location of the center of the image, check the interlaced and static convergence.
6, definition line, 140,220,300,380,500 line 5. Use it to observe and adjust the clarity of the TV, color saturation part of the bandwidth of 4.43MHz subcarrier and line frequency locking relationship.
7, gray scale, it is used to measure the gray scale test with. This test with the signal amplitude is divided into six, examine and adjust the linear and white balance.
8, white rectangular block is used to check the antenna or cable to match the poor because the high frequency reflection.
9, the standard time flag, the black rectangle on a white background broadcast the Beijing standard time for viewers with Time.

last for CCTV being used e-great circle television test card. Is divided into: general, sports version, the enhanced version and dazzle version. The regular edition is now mainly used in central television, sports version is used primarily for television stations, the enhanced version and the dizzying version used in other local television stations.

a round of extracellular signal: color signal, followed by 16 different color components; gray levels, this test with the signal amplitude is divided into four, examine and adjust the linear and white balance.
2, definition line, left MHZ3.58/4.28 and TVL100-300; right MHZ4.43 and 5.13; the frequency of the middle and lower middle color (blue, yellow, green), respectively 1.0MHz, 0.5 MHz, 1.5MHz, for a clear point of view and measurement of the light / color delay.
purple-order level and the Red Square, is used to adjust the hue and saturation can also check the TV automatically achromatic circuit is normal.
right the middle of three figures, including 20% ​​of the white lines on black, black lines on white and dark gray bottom white line. The three graphics for the ringing and reflection measurements.
circle signal: 1, e-great circle, the middle of the concentric frequency up to 5.5MHz, can be observed to 429 lines can also check the line time base error and comb filter and scanning Transformation properties.
2, left the middle of three figures, respectively, as follows: (1) 93.75% white lines, the background is 100% white; (2) 35% of the duplex; (3) 75% dark gray at the end of . These three graphics are used to adjust the brightness and contrast. When the line is the shortest, indicating that the brightness and contrast adjustment is appropriate.
3, right central graphical continuous observation of the frequency response (1.5 ~ 5.5MHz). 4, above, is a TV station logo, as well as clarity of line of by TVL300 and 400, and the rest is MHZ3.58 and MHZ4.43. 5, the following is a TV station logo display area. PS: The above are the ordinary version for example, the other version much the same.