SU559456A1 - Digital TV tracking device - Google Patents

Description

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The invention relates to television and can be used in television devices for tracking moving objects.

A known television tracking system comprising a photoelectric sensor, a video signal processing unit, strobe pulse drivers, signals from which are sent to comparison blocks, a phase detector, a pulse generator, clock counters in the horizontal and vertical direction, and corresponding digital-analog converters, with the outputs of which take the error signal to control the position of the photoelectric sensor l}.

However, the well-known television tracking system is characterized by low reliability and has a complex hardware implementation.

The closest technical solution to this invention is a digital television tracking device containing a digital phase detector, the output of which is connected 4e}: i.e. a digital filter with

Entering the coordinate registers in the row and frame, the gate driver, the output of which is connected to the first input of the digital phase detector 2.

This known device has a not high tracking accuracy, due to the instability of the natural frequencies of the auto-oscillators of the horizontal and frame frequencies.

The purpose of the invention is to improve the tracking accuracy.

The goal is achieved by the fact that a digital television tracking device containing a digital phase detector whose output is connected via a digital filter to the inputs of coordinate registers in a row and a frame, a strobe driver, the output of which is connected to the first input of a digital phase detector, is inserted two bit units comparison and two pulse counters, and the inputs of the blocks by) the comparison comparison are connected to the outputs of the bits of the corresponding. (coordinate registers and pulse counters, and their outputs are connected to forkt1 s) |.) denominators gate, the second input of the digital phase detector is coupled to the first pulse counter. The drawing shows the structural electrical circuit of the proposed device. It contains a digital phase detector 1, the output of which is connected through a digital filter 2 to the inputs of the coordinate registers 3 and 4 on the line and on the frame, two blocks of bitwise comparison 5 and. 6, two pulse counters 7 and 8 and a gate driver 9, the output of which is connected to the first input of the digital phase detector 1, while the inputs of bit comparison blocks 5 and 6 are connected; respectively, with the outputs of the bits of the coordinate registers 3 and 4 in the row and the frame and the outputs of pulse counters 7 and 8, and the outputs of blocks of bitwise comparison 5 and 6 are connected to the inputs of the former of the gate 9, the second input of the digital phase detector 1 is connected to the first pulse counter 7. The device operates as follows: In digital phase detector 1, the difference in the number of pulses of the clock frequency (i.e., the repetition frequency of the decomposition elements in the television standard used) is calculated; object -. located at left and right, upper n lower polustrobah These differences are then processed in the digital filter 2 and, depending on their sign dissolved, cause increase or decrease the numbers recorded at the beginning of vertical deflection cycle television picture kazvdogo

in the coordinate registers 3 and 4 on the line and frame. Pulse counters 7 and 8 clock and line frequencies during the reverse sweep stroke are nullified, respectively, with horizontal and vertical clock pulses, after which {during the forward sweep stroke) their contents continuously increase in. some time point turns out equal to the contents of the coordinate register 3 and 4 on the line and frame. These times are recorded by blocks of different coordinate registers and pulse counters, and their outputs are connected to the gate driver inputs, while the second input of the digital phase detector is connected to the first pulse counter.

Sources of information taken into account in the examination:

1. US Patent No. 3114859, cl. 31524, 11.12.58.

2. UKEThaib, 1961, V. MLT-5, No. 4, p. 326. A series of comparisons 5 and 6, which serves as a signal for the start of the strobe driver 9. The strobe produced by this driver is superimposed on the input video signal of the digital phase detector 1 in the next frame television scan cycle and has coordinates that coincide with the estimated coordinates of the image object in the same frame contained in the registers of coordinates 3 and 4. The introduction of blocks of bitwise comparison and impulse counters instead of the usually used for the same purpose controlled self-oscillators of horizontal pulses and cleaved frequencies avoids instability caused by these autogenerators gate position on the television image, and hence increase the tracking accuracy: in the observed object. An inventive formula Digital television tracking device containing a digital phase detector, the output of which is connected through a digital filter to the inputs of coordinate registers in a row and a frame, a strobe driver, whose course is connected to the first input of a digital phase generator, about which that, in order to increase tracking accuracy, two & one bit comparison unit and two pulse counters, with the inputs of the one time comparison unit connected to the outputs