SU924915A1 - Device for shaping circular figures on television raster - Google Patents

Description

(54) DEVICE FOR THE FORMATION OF CIRCULAR FIGURES

ON TELEVISION

one

The invention relates to a technique, and can be used to create special effects, test patterns in arc generators, gaming machines and information display devices on television-: indicators.

A device for forming circles on a CRT screen is known, containing line and frame channels for forming a video signal, each consisting of successively connected amplifiers of sawtooth pulses, a unit for shifting the coordinates of the center of a circle and a generator of parabolic pulses, an adder whose two inputs are connected to the outputs of parabolic pulse generators, control voltage source and threshold device Cl

It is also known a device for forming circular shapes anywhere on a television raster by the ShyM Method, which contains line and frame channels for forming a video signal each

One of which consists of a series of delays, a pulse former, a generator of sawtooth pulses and a generator of parabolic pulses, an adder, which is connected to the outputs of parabolic pulsers by two inputs, and an output with a threshold device, and a control voltage source that is connected with another input of the threshold device 2.

A disadvantage of the known device is the low stability of the formation of circular shapes of small radius.

The purpose of the invention is to increase the stability of the formation of circular shapes of small radius.

This goal is achieved by the fact that in a device for forming circular shapes on a body raster containing a line and frame channels of forming a video signal, consisting each of a delay unit connected to a pulse shaper, and a pictorial pulse generator Pi392, the output of which is connected to the first input of a parabolic generator pulses, an adder, the inputs of which are connected to the outputs of the generators of parabopic pulses of both channels of the video signal formation, and the output to the input of the threshold device, and The source of control voltage, in each channel of the video signal formation between the output of the pulse former and the generator of the sawtooth pulse, is connected in series with the sweep function generator and the two-threshold comparator, and a two-threshold inverter between the control voltage source and the control input of the two-threshold comparator is turned on, and the other inputs are double-threshold and the other threshold has a double threshold. , a sawtooth pulse generator and a parabolic pulse generator are connected to the output of the control voltage source eni Fig, 1 shows the block diagram of the proposed device; in fig. 2 - time diagrams of his work. The device contains a lowercase and quadruple channels of the formation of a video signal in which the first block includes a delay unit 1, a driver of 2 pulses, a generator 3 of a sweep function; two threshold comparator 4, a generator of 5 pier-shaped pulses and a generator of 6 parabolic pulses, per device. also includes an adder 7, a trade device 8, a source of control voltage 9, a phase inverter 10, and a delay block 11, a pulse former 12, and a generator are included in the video signal forming channel. 13 sweep function, two-threshold comparator 14, generator 15 sawtooth pulses and generator 16 parabolic pulses. The device works as follows. The input sync pulses (frequency f) of the synchronization signal of the television indicator are fed to the input of the block 1 delay of the line channel of signal formation. After a certain time delay XQ, the pulses generated by shaper 2 (Fig. 2a) start the generator 3 of the sweep function which generates a pulse signal in the form of a linearly varying voltage of constant amplitude and duration (Fig. 26), as well as a symmetrical zero level eg. living This pulse signal is sent to the first input of the two-threshold comparator 54 4. The second and third inputs of the comparator 4 are supplied respectively to the voltage Of) from the source of control voltage 9 and -UQ C of phase inverter 10, controlling the size of the circular figure. For the duration of the signal of the comparator 4 (Fig. 2c), the generators 5 sawtooth pulses and 6 parabolic pulses are triggered, which generate pulses of the corresponding form of constant amplitude independently of the formation time, i.e. from Up (Fig. 2d, and correspondingly). In order to ensure this, the second inputs of the generators 5 and 6 are supplied with the voltage Up, which simultaneously changes the parameters of the time of the driving RC circuits of the generators 5 and 6. The laws of variation of these parameters are determined as follows. The duration of the pulse of the comparator 4 is defined as Y, the offset of the T is the duration of the forward code of a slender sweep; 2 .J is the amplitude value of the sweep function of the Generator 3. The pulses of the generator 5 sawtooth pulses are described by the following expression: (2) f 5 / where K is the integration constant, since in such cases an integrator is most often used. The amplitude of the sawtooth pulse is (3) It can be seen that - is to satisfy the requirement of constant amplitude of the sawtooth pulses of the generator 5, i.e. U) (sCorist) the condition KX fn (4) must be met. Similarly for the Parabolic impulse, the following holds true: "... read ;: where. the integration constant of the generator is 6 parabolic pulses. The amplitude of the parabolic pulse is equal.-S and U | stonsi is performed at K y t (7). Conditions (4) and (7) are easily implemented practically. Thus, at the output of the generator 6 parabolic pulses of the horizontal channel of formation, pulses are formed with a horizontal frequency and constant amplitude, the duration of the pulses is determined by the voltage U- and is directly proportional to the latter. Similarly, pulses are formed in the frame channel of signal generation (Fig. 2e, g). Then the parabolic pulses of the line and frame frequencies go to the adder 7, from the output of which is additive (Fig. 2h) the mixture goes to the threshold device 8. The response voltage Oo of the threshold device 8 is constant and is set equal to the amplitude of the parabolic frame frequency pulse. A pulse signal from the output of the threshold device 8 forms a circular figure on the television indicator screen, while using

the delay units move it across the screen, and the voltage UQ determines its size.

Thus, the proposed device provides the formation of parabolic frame and line pulses of constant amplitude, but variable, duration, depending on the control size of the voltage figure. The control voltage for this is not supplied to the output threshold device, but to the horizontal and frame channels of signal generation, while the comparison voltage of the output threshold device remains constant. And since the initial steepness of the parabolic pulse in the mixture increases, the stability of the formation of a circular shape increases with a decrease in its size. For a known device, on the contrary, with a decrease in the size of the circular figure, the stability of the formation decreases, since the first derivative of the parabolic pulse at the instant of triggering the threshold device decreases. The proposed device provides for the formation of circular shapes of any 92

Claims (2)

video signal shaping, a. the output to the input of the threshold device, and a source of control voltage, characterized in that, with a chain of size 156 in any place of the television raster. It can be used in information display devices, in special effects generators, executive images, in gaming machines, in interactive image analysis devices, for example, to create an orifice plate and in other technical devices for synthesizing television images. Apparatus of the Invention A device for generating circular patterns on a television raster, comprising line and frame channels for forming a video signal, each consisting of a delay unit connected to a pulse generator and a pipiform pulse generator, the output of which is connected to the first input of a parabolic pulse generator, an adder, whose inputs connected to the outputs of the generators of parabolic pulses of both gutters of the stability of the formation of circular figures of small radius, in each channel and a video signal between the output of the pulse former and the input of the sawtooth pulse generator are connected in series with the sweep function generator and a two-threshold comparator, and a phase inverter between the control voltage source and the control input of the two-threshold comparator is turned on, and the other inputs of the two threshold comparator, sawtooth pulse generator and the generator of the sawtooth pulse and the generator of the sawtooth pulses and the generator of the sawtooth pulses and the saw generator pulses. parabolic pulses are connected to the output of a control voltage source. Sources of information taken into account during the examination 1. USSR author's certificate No. 742986, cl. G About K 15 / 2O, 1977. 2. Google I. I. N. Electronic synthesis of circular shapes on a television raster. Technique of film and television, 1967, No. 11, p. 6O-63 (prototype). I J ° (/ L - (It w f2 ff T: t, Y: U 57iM wzJ