SU807501A1

SU807501A1 - Spiral scanning shaping device

Info

Publication number: SU807501A1
Application number: SU762322191A
Authority: SU
Inventors: Степан Михайлович Слободян
Original assignee: Институт Оптики Атмосферы Со Анссср
Priority date: 1976-02-06
Filing date: 1976-02-06
Publication date: 1981-02-23

Description

Изобретение о.тноситс к радиотехнике и может использоватьс в телев дении.The invention relates to radio engineering and can be used in television.

Известно устройство дл формировани спирашьной развертки, содержащее генератор тактовых иМпульсов .-(ГТИ) и первый и второй генераторы амплитудно-модулированного (АМ) напр жени , выходы которых соединен соответственно с первым и вторым входами электроннолучевой трубки (ЭЛТ) 11.A device for forming a spiral sweep is known comprising a clock pulse generator .- (GTI) and a first and second generator of amplitude modulated (AM) voltage, the outputs of which are connected respectively to the first and second inlets of the cathode ray tube (CRT) 11.

Однако известное устройство характеризуетс невысокой точностью работы,обусловленной нелинейностью спиральной развертки, нестабильнос- ю центровки спирального растра и переменной по полю сканировани линейной скоростью развертки.However, the known device is characterized by a low accuracy of operation, due to the nonlinearity of the spiral scan, unstable centering of the spiral raster and variable in the scanning field by the linear scanning speed.

Целью изобретени вл етс повышение стабильности центровки и скорости развертки.The aim of the invention is to improve the stability of the centering and scanning speed.

Указанна цель достигаетс тем, что в известное устройство дл формировани спиральной развертки введены последовательно соединенные блок запрета, вход которого соединен с выходом ГТИ, формирователь импульсов, триггер, счетчик числа оборотов спирали, элемент И и одновибратор , выход которого соединен с вторыми входами блока запрета, формировател импульсов и счетчика числа оборотов спирали, а также соответственно с входами вновь введенных первого и второго заземленных ключей, выходы которых соединены с первыми входамк первого и второго генераторов AM напр жени . This goal is achieved by introducing a series-connected prohibition unit into a known device for forming a spiral scan, the input of which is connected to the output of the GTI, a pulse shaper, a trigger, a counter for the number of revolutions of the helix, an And element and a single vibrator whose output is connected to the second inputs of the prohibition block, pulse shaper and the counter of the number of turns of the helix, as well as respectively with the inputs of the newly entered first and second grounded keys, the outputs of which are connected to the first inputs of the first and second AM voltage generators.

0 Первый и второй инверторы, подключенные соответственно к первому и второму выходам формировател импульсов , перзый выход которого соединен также с вторым входом элемен5 та И, и первый и второй переключатели , первые входы которых соединены соответственно с выходами первого и второго инверторов, вторые входы переключателей соединены с 0 The first and second inverters connected respectively to the first and second outputs of the pulse driver, the per-output of which is also connected to the second input of the AND element, and the first and second switches, the first inputs of which are connected respectively to the outputs of the first and second inverters, the second inputs of the switches are connected with

0 первым и вторым выходами триггера соответственно, а вторые и третьи входы первого и второго генераторов AM напр жени соединены соответственно с выходами первого и второго 0, the first and second outputs of the trigger, respectively, and the second and third inputs of the first and second voltage generators AM are connected respectively to the outputs of the first and second

Claims

5 switches. A device for forming a spiral scan contains a GTI. 1 block 2 prohibition, shaper 3 pulses, trigger 4, rev counter 5;; piers, element B, one vibrator 7, first and second grounded keys 8 and 9, first and second inverters 10 and 11, first and second switches 12 and 13, the first and second voltage generators 14 and 15 AM, CRT 16, the device operates as follows. Clock pulses (Fig. 2a) with the GTI 1 through the block 2 of the ban enter the input of 3 pulses. From the first output of the imaging unit 3, the pulses (Fig. 26) go to trigger 4, inverter 10 and element 6, and from the other output (out of phase) to the input of the inverter 11. To the inputs of switches 1.2 and 13 come from the outputs Hypertors 10 and 11, respectively, of a sequence of bipolar pulses (figure 2 g). Switches 12 and 13, controlled by voltages (Fig. 2e, e), coming from opposite arms of flip-flop 4, form shifted one relative to another pulse sequences (Fig. 2, g, h). These sequences arrive at the corresponding inputs of the generators 14 and 15, which form sweep voltages across the axes X and V (Fig. 2, k), the simultaneous supply of which to the deflecting system of the CRT 16 causes the tube aperture to move along square square a continuous trajectory with a constant linear scanning speed. The duration of the first step, for example, on the first half turn of the helix along the X axis, as well as the y axis along the scan duration of one element. The duration of the next steps (lines) of scanning along the X axis (or y axis) increases by a factor of F (F - the number of a half-turn of the square helix). Upon completion of the / 2 turn of the spiral, the counter 5 of the number of turns of the spiral, to the counting input of which pulses are received from one of the outputs of the trigger 4, impulses a pulse arriving at the input of the I & b element. When the pulses of the counter 5 and the imaging unit 3, which are posting to the inputs of the element Ib, coincide, the one-shot 7 is started, a reset pulse is generated, which is fed to the inputs of the grounded keys 8 and 9, the counter 5, the imaging unit 3 and the prohibition block 2, and stopping the flow of pulses GTI 1 to the input of the imaging unit 3, returns to the initial state of the imaging unit 3, the counter 5, and also opens the grounded keys 8 and 9, thus forming a reverse sweep stroke. The proposed device: square formation (with alternating moves along the axes X and Y) of spiral intelligence with a constant linear scanning speed with high quality centering and linearity of the spiral raster, which significantly improves the accuracy of reading information (i.e., significantly degree to reduce the distortion of the INP, made when scanning along a spiral path). In addition, the device provides a sufficiently high stability and synchronism of the operation of the channels for the formation of spiral reconnaissance along both coordinate axes. Formula of the Invention A device for the formation of a spiral scan containing a -generator of clock pulses and first and second generators of amplitude-modulated voltage, the outputs of which are connected respectively to the first and second entrances of the electron-beam tube, characterized in that, in order to increase the stability of the centering and the sweep speed, are introduced after blocking unit, the input of which is connected to the output of the clock generator, pulse shaper, trigger, helix speed counter, element and and one-shot, the output of which is connected to the second inputs of the inhibit bar, pulse shaper and the speed indicator of the helix, as well as the inputs of the newly entered first and second grounded switches, the outputs of which are connected to the first inputs of the first and second generators of amplitude-modulated voltage, the first and second inverters, n Connected respectively to the first and second outputs of the pulse generator, the first output of which is also connected to the second input of the element I, and the first and second switches, the first inputs of which are connected respectively to the outputs of the first and second inverters, the second inputs of the switches connected to the first and second outputs of the trigger, respectively , and the second and third inputs of the first and second generators of c-amplitude-modulated voltage are connected respectively to the outputs of the first and second switches. Sources of information taken into account in the examination

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