SU1238224A1 - Device for duration selection of television signal pulses - Google Patents

Abstract

The invention can be used in digital processing of television images. The selection accuracy is improved by taking into account all the pulses of the television signal that make up the image of the object. The pulse signal corresponding to the two-gradation image of the object tvv arrives at the And 2 element directly and through the first delay line (LZ) 1. From the And 2 element, the signal arrives at the trigger 4, setting it to single unit. At its other input, a signal is received from the first element OR NOT 3. From trigger 4, the generated pulse through the element OR 511 goes to the output of the device. The input signal delayed by LZ 1 is fed to the OR-NOT 7 element directly and through the second LZ 6. The coincidence signal, indicating that the pulses were in the video signal, from the OR-NOT 7 element is fed to the trigger 8, setting it to the zero state. The signal from LZ 6 sets the trigger 8 to the unit state. The signal from the output of LZ 1 with coincidence in time with the signal of the trigger 8 passes through the element AND 9 and further through the element OR 5 to the output of the device, v. 2 Il. i (L S 1CHE 00 00 tc to 4

Description

The invention relates to a pulse and television technology and can be applied to filter a quantized video signal in digital processing of television images.

The object of the invention is to improve the accuracy of selection by taking into account all the pulses of a television signal constituting the image signal of an object.

FIG. 1 shows a structural electrical circuit for a device for selecting 10 pulses of television signal each; in fig. 2 - diagrams explaining his work.

A device for selecting by duration; pulses of a television signal (Fig. 1) contains the first delay line 1, the first element AND 2, the first element OR-NOT 3, the first trigger 4, the element OR 5, the second delay line 6, the second element OR NOT 7, the second trigger 8 and the second element And 9.20

 The device for selecting the duration of the television signal works as follows.

Suppose that a pulsed video signal is present at the input of the device, corresponding to an auth Grading image of the object 25 shown in FIG. 2a In this case, within three consecutive lines of decomposition, specified by the horizontal sync pulses (Fig. 26), a pulsed video signal is present at the input of the device and at the output of the first delay line i (Fig. 2b). In this case, the duration of the first two pulses TI and Ta is less than the threshold value PM, given by the first delay line 1, and the length of the third pulse. As a result, the first input (installation input 1c

thirty

element OR-NOT 7 (direct and delayed by the second delay line b, fig. 2d). The signal (Fig. 2e) from the output of the second element OR-NOT 7 sets the second trigger 8 at the first input to the zero state to a high level, and to the one state the second trigger 8 is set by a signal from the output of the second delay line 6 (Fig. 2e), which is possible only in the case of overlap in time of the first and second pulses. At the output of the second trigger 8, a signal is generated (Fig. 2g), which allows the signal to pass to a high level. the output of the second element And 9 (Fig. 2h), from which the signal through the element OR 5 enters the output of the device (Fig. 2i).

Claims (1)

Invention Formula A device for selection over the length of the "1" OF TIPS of a television signal containing. the first delay line connected in series, whose input is entered by the device, the first element is AND,: the first trigger and the OR element whose output is the device output, the second input of the first trigger is connected to the output of the first element OR NOT, the first input which is connected to the input of the first delay line and to the second track of the first element AND, and the second input is connected to the output of the first delay line, and also to the second connected delay line, the second element OR NOT, the second trigger and the second element and output otorrhea connected to the second input of the OR gate and the second input - to a second input of first OR-NO unit) of the first trigger 4 through the first 5 and with the second input of the second element element II 2 passes only the third pulse, and at the output of the first trigger 4 a signal is generated (Fig. 2d) arriving at. output of the device through the element OR 5.; The criterion of belonging of the first and second pulses to the video signal, and not interference, is their coincidence in time through the line, i.e. on the first and second inputs of the monkey, the first input of which is connected to the second input of the second trigger, characterized in that, in order to improve the selection accuracy by taking into account all pulses i of the television signal that make up the image signal, the input of the second delay line is connected to the second, the entrance of the BTOpofo element I. element OR-NOT 7 (direct and delayed by the second delay line b, Fig. 2e). The signal (Fig. 2e) from the output of the second element OR-NOT 7 sets the second trigger 8 at the first input to the zero state to a high level, and to the one state the second trigger 8 is set by a signal from the output of the second delay line 6 (Fig. 2e), which is possible only in the case of overlapping the first and second pulses. At the output of the second trigger 8, a signal is generated (Fig. 2g), which allows the signal to pass to a high level. the output of the second element And 9 (Fig. 2h), from which the signal through the element OR 5 enters the output of the device (Fig. 2i). Invention Formula A device for selection over the length of the "1" OF TIPS of a television signal containing. the first delay line connected in series, whose input is entered by the device, the first element is AND,: the first trigger and the OR element whose output is the device output, the second input of the first trigger is connected to the output of the first element OR NOT, the first input which is connected to the input of the first delay line and to the second track of the first element AND, and the second input is connected to the output of the first delay line, and also to the second connected delay line, the second element OR NOT, the second trigger and the second element and output otorrhea connected to the second input of the OR gate and the second input - to a second input of first OR-NO and with the second input of the second element  and with the second input of the second element NOT, the first input of which is connected to the second input of the second trigger, which is different in that, in order to increase the selection accuracy by taking into account all pulses i of the television signal that make up the image signal, the input of the second delay line is connected to the second one, BTOpofo - .menta I. J { Tc t ff e Well f Js fie2