SU636815A1 - Television signal digital shaper - Google Patents

Description

A horizontal switch input and a sequential single sampling pulse generator and horizontal sampling counter are connected to the second input of the vertical sampling counter, the third output of the sync generator is connected to the second input of the vertical direction switch, and the fourth output is connected to the first input of the digital coding unit and the first analog input -kodirukitsego block TK additionally, the first, second and third outputs of the logic unit are connected respectively to the second, third mu and fourth inputs of the digital encoding unit and via a digital to analog unit connected respectively to the WTO rum, third and fourth inputs analogokodiruyuschego block. The drawing shows a structural electrical circuit of the proposed digital driver. The digital TV signal generator contains a synchronizing generator 1, a horizontal sampling counter 2, a vertical sampling counter 3, a logical block 4 and an analog coding block 5, the first and second controlled frequency dividers 6, 7, the first and second billing counters 8, 9, the programming unit 10, a horizontal directional switch il and a vertical direction switch 12, a sampling pulse generator 13, a digital encoding unit 14, a digital-analogue unit 15. The first output of the synchronous generator 1 is through a successor The first controlled frequency divider 6, the first reversible counter 8, the vertical direction switch 12 and the vertical sampling counter 3 are connected to the first input of the logic unit 4. The first output of the synchronous generator 1 is connected through the second controlled second frequency divider 7, the second reversible counter 9, the switch 11 of the horizontal direction and the counter 2 of the horizontal discretization are connected to the second input of logic unit 4, the third input of which is connected to the first output of the programmer Ani 10. The second and third outputs of the programming unit 10, respectively, are connected to the second input of the first and second controlled frequency dividers 6.7, and the fourth and fifth outputs to the second input of the first and second reversible counters 8, 9. The first and second inputs The programming unit 10 is connected respectively to the output of the first and second reversible counters 8, 9. The second output of the synchro-generator 1 is connected to the second. The input of the horizontal direction switch 11 and the jisP serially connected sampling pulse generator 13 and the horizontal sampling c4et4HK 2 are connected to the second input of the vertical sampling counter 3. The third output of the sync generator 1 is connected to the second input of the switch 12 of the vertical direction, and the fourth output to the first input of the digital coding unit 14 and to the first input of the analog-coding unit 5. In addition, the first, second and third outputs of the logic unit 4 are connected respectively to the second , the third and fourth inputs of the digital encoding unit 14 and through the digital-analogue unit 15 are connected to the second, third and fourth inputs of the analog-encoding unit 5, respectively. Digital television driver The signals works as follows. The generator 13 is synchronized by the horizontal damping pulses of the synchronous generator 1. In the horizontal flyback interval, the generator 13 is braked, and in the forward running interval it forms a packet of pulses that are counted by counter 2. The horizontal pulses generated by the counter 2 are fed to the counter 3 and in the horizontal interval The course of the frame sweep is calculated by it. Counters 2 and 3 form, respectively, digital scanning functions (CRF) of horizontal and vertical sampling, which are used as primary signals for synthesizing the signals of the primary colors (R, C, b) of television images. These signals, expressed by a parallel multi-digit digital code, are formed by logic block 4, which is expediently performed in the form of a matrix permanent storage device (ROM). At the output of the digital TV signal generator, the digital-analog block 15 and the analog-coding block 5 are used, which form the complete video signal as the sum of the luminance, chromaticity and sync signal. The output of the analog encoding unit 5 is the analog output of the driver. In the reverse and horizontal sweep intervals, the counter 2 and, accordingly, the counter 3 are braked and can be set to a certain code state. The image shift rate is determined by the magnitude of the clock frequency. At the same time changing the installation codes of the counters 2 and 3, the image is shifted both horizontally and vertically. By changing the codes and clock frequencies accordingly, you can shift the image in any direction. To change the setting code of counter 2, a second controlled frequency divider 7, a second reversible counter 9 and a switch il are used.

To change the installation code of the counter 3, the first controlled frequency divider 6, the first reversible counter 8 and the switch 12 are used.

Changing in one direction or another, the division factors of the first and second controlled frequency dividers 6 and 7 can increase or decrease the vertical and horizontal rates of image progression on the raster, respectively. Reversing the first or second reversible counters 8 or 9 allows the direction of the vertical or horizontal image advancement to be reversed.

Information from the discharge outputs of reversible counters is fed to the inputs of the unit Yu. In addition, unit 10 controls the operation of logic unit 4, determining image selection.

At the output of logic block 4, the signals of the primary colors (T, d, B) are expressed by a parallel multi-digit digital code. The conversion of a digital signal into an analog signal of a calibrated level is carried out with high accuracy by a digital-analogue unit 15, which, in addition, performs level-coding of signals depending on their chromaticity. The primary colors of the digital-to-analog block 15 are connected to the outputs of logic block 4, and the outputs to the corresponding inputs of the analog-coding block 5. In addition, the signals from the output of the digital-analog block 15 can be used directly to reproduce images with television indicators with a three-signal input .

The primary color signals generated by logic block 4 are also fed to the inputs of the digital encoding unit 14, which in turn generates a complete video signal (the sum of luminance, chroma and synchronization signals) as a sequence of samples expressed by a multi-digit digital code. For this, code patterns of the logic block 4, expressed by a parallel digital code, are converted into a serial digital code. The signal generated by the digital coding unit 14 can be transmitted over digital communication channels.

Thus, in the proposed digital signal conditioner, a parallel digital code taken from the outputs of the primary colors of the logic unit 4 is converted into an analog signal and a serial digital code signal, which is carried out respectively by the digital-analog unit 15 and the digital coding unit 14. This allows em being

to increase accuracy of formation.

In addition, the proposed shaper of television signals provides movement on a raster of any formed images in any direction, with different speeds, as well as complex types of movement with changes in direction and speed.

Claims (1)

1. USSR author's certificate 470830, cl. Q 06 K 15/20, 1972.