RU1811030C - Device for separating chroma and luminous signals in secam decoder - Google Patents

Abstract

The invention relates to television technology and can be used in the construction of decoding devices of the known SECAM television system. The purpose of the invention is to reduce distortion of luminance and fame signals at inclined luminance and color boundaries. The device contains six delay lines 1, 2, 7-10, three electronic switches 3, 13 and 14, a control unit 4, an adder 5, a subtractor 6, and two interpolators 11 and 12. The device allows you to compensate for the dentation of the inclined transitions of the brightness and color signals . 1 ill.

Description

The invention relates to television technology and can be used to construct decoding devices for color television in the SECAM system.

The purpose of the invention is to reduce distortion of luminance and color signals at oblique luminance and color boundaries.

The drawing shows a structural electrical diagram of a device for separating luminance and color signals in a SECAM system decoder.

The device contains the first 1 and second 2 delay lines on two lines, an electronic switch 3, a control unit 4, an adder 5, a subtractor 6, a third 7, a fourth 8, a fifth 9 and a line 10 delay lines per line, the first 11 and second 12 interpol tori, second 13 and third 14 electronic switches.

The first 1 and second 2 delay lines on two lines can be built up: for example, in the form of CCD delay lines connected in series.

The first 11 and second 12 interpolators can be made on the basis of an adder that sums the signals that are fed to its inputs, followed by their division.

The full color video signal from the input of the device goes to the input of the first delay line 1 to two lines and to the third input of the electronic switch 3. The output of the first delay line 1 to two lines is connected to the input of the second delay line 2 to two lines and to the first inputs of subtractor 6, adder 5 and control unit 4. The output of the second delay line-2 on two lines is connected to the first input of the electronic switch 3 and the second input of the control unit 4. The first output of the control unit 4 is connected to the second input of the electronic switch 3. The output of the electronic switch 3 is connected to the first inputs of the adder 5 and subtractor 6. The output of the subtractor 6 is connected through a third 7, fourth 8 delay line per line and the first interpolator 11 to a second electronic switch 13, the output of which is the output of a color signal. The second input of the first interpolator 11 is connected to the output of the subtractor b, The second output of the second electronic switch 13 is connected to the output of the third delay line 7 per line. The output of adder 5 is connected through a fifth, 9th, sixth 10 delay line per line and a second interpolator 12 connected to a third electronic switch 14, the output of which is the output of the brightness signal. The second input of the second interpolator 12 is connected to the output of the adder 5. The second output of the third electronic switch 14 is connected to the output of the fifth delay line 9 per line. The third inputs of the second 13 and third 14 electronic switches are combined and connected to the second output of the control unit 4.

The device operates as follows.

The input device receives a full color video signal. Each of the delay lines 1 and 2 delays the signals for the duration of two lines. First entry

subtractor b receives a video signal delayed by two lines. The second input of the subtractor 6 receives a signal from the output of the electronic switch 3, which switches the output signals from the input of the device or from the output of the second delay line 2 on two lines. The first electronic switch 3 is switched by the control unit 4. In subtracter 6, the extracted signal pairs are subtracted. As a result, the luminance signal components are suppressed and a color signal is extracted. At the output of adder 5, a luminance signal is generated. A detailed description of this section of the device is given in 2. Dedicated

the brightness signal is fed to the input of the fifth delay line 9 per line and the second input of the second interpolator 12. The third electronic switch 14 switches the brightness signal to the output of the device. At

of different polarity of the color signal at the input of the device and at the output of the first delay line 1, a dedicated luminance signal arrives at the device output in two lines, and with the same polarity of the color signal, the luminance signal received as a result of interpolation of the luminance signal highlighted in the previous and next lines,

This compensates for the serration of the inclined luminance boundaries arising due to the uneven delay of the luminance signal in the device for separating luminance and color signals in the SECAM system decoder.

The dent compensation channel in the color signal works the same way.

Thus, the proposed device for separating luminance and color signals in the SECAM system decoder allows to compensate for the serration of oblique transitions of the luminance and color signals, which improves the quality of the reproduced image in the SECAM system.

Claims (1)

SUMMARY OF THE INVENTION A device for separating luminance and color signals in a SECAM system decoder, comprising first and second delay lines in two rows in series and a first electronic switch, the output of which is connected to the first inputs of the adder and subtractor, the second input of which is connected to the input of the second delay line two lines and the second input of the adder and the first input of the control unit, the second input and the first output of which are connected respectively to the first and second inputs of the first electronic switch RA, the third input of which is connected to the input of the first delay line in two lines and is the input of the device for separating the luminance and color signals in the SECAM system decoder, characterized in that, in order to reduce distortion of the luminance and color signals at inclined luminance and color boundaries, the third and fourth lines are connected in series delays per line, the first interpolator and the second electronic switch, the output of which is the output of the color signal of the device for separating the growth and color signals in the decoder of the SECAM system. the fifth and sixth delay lines per line, a second interpolator and a third electronic switch, the output of which is the output of the signal of the device for separating the luminance and color signals in the SECAM system decoder, the subtractor output is connected to the second input of the second interpolator and third line entrance delays to a line whose output is connected to the second input of the second electronic switch, the third input of which is connected to the second output of the control unit and the third input of the third electronic switch, the second input of which is connected to the output of the fifth delay line to the line whose input is connected to the second input of the second interpolator and adder output.