RU2037973C1 - Shaper of information quantization pulses of screen of cathode-ray tube - Google Patents

Abstract

FIELD: computer engineering. SUBSTANCE: device has unit 1 which serves for generation of pulses which correspond to position of electronic beam on the cathode-ray tube screen. In addition device has video signal generation unit 2, row parity detection unit 3, pulse delay unit 4, commutator 5. This results in possibility to increase resolution. By this reason number of complex multiplication which are needed for two-dimension algorithms of quick Fourier transform are decreased by 25 percents. EFFECT: simplified generation and processing of two-dimensional images. 3 cl, 3 dwg

Description

 The invention relates to computer technology and can be used in raster input and display devices with sequential access to information.

 Various devices are known for providing image formation on the screen of an electron beam device (ed. St. USSR No 768007, class H 04 N 3/26, 1978). The device generates sweep signals, includes control pulse shapers, signal extraction blocks, a pulse generator, signal conditioning amplifiers.

 However, this device does not provide the formation of a raster of information discretization on the screen of the electron beam device, since it acts on the video signal of discrete pulses corresponding to the position of the electron beam on the screen.

 Known devices for creating pulses that control the formation of a raster of information sampling on the screen of an electron beam device, including a pulse generation unit corresponding to the position of the electron beam on the screen of the electron beam device, and a video signal generation unit.

 This device is taken as a prototype and allows the formation of a raster of discretization of information on the screen of an electron beam device, since there is an effect on the video signal of discrete pulses corresponding to the position of the beam on the screen of the electron beam device.

 In this device, the block generating pulses corresponding to the position of the beam on the screen of the cathode-ray device includes a clock generator, a frequency divider and a cathode ray tube (CRT) controller with a circuit for generating frame and horizontal sync pulses. The video signal generating unit (BFVS) includes a read-only memory (ROM) of the character generator, a shift register and a control circuit for the visual characteristics of the characters. The BFIP generates a sequence of pulses corresponding to the position of the beam on the CRT screen ("shear frequency"), which enter directly into the BFVS (in the shift register). Under their influence, the information recorded in the shift register from the ROM of the character generator is converted to a serial code and fed to a control circuit for the visual characteristics of the characters, where it is converted into video pulses that control the intensity of the electron beam and form a raster of information discretization on the CRT screen. In this case, the elements of the raster form a rectangular structure, also the rectangular structure of the raster is formed in other known devices for its formation.

 Due to the rectangular raster, a low density of samples takes place, since the two-dimensional spectrum of images formed on a CRT screen has the shape of a circle. The low density of samples in a rectangular raster formed by the prototype device complicates the formation and processing of two-dimensional images in solving computer graphics problems.

 The objective of the invention is the creation of such a device for forming a raster of sampling information on the screen of an electron-beam device, which would simplify the formation and processing of two-dimensional images.

 This is solved due to the fact that the line parity determinant is introduced in the device for creating pulses controlling the formation of the information sampling raster on the screen of the electron beam device, including the pulse generation unit corresponding to the position of the electron beam on the screen of the electron beam device and the video signal generation unit, block delay pulses corresponding to the position of the electron beam on the screen of the electron beam device and the switch. In this case, the output of the pulse generating unit corresponding to the position of the electron beam on the screen of the electron beam device is connected to the first input of the switch, the input of the line parity determiner and the input of the pulse delay unit corresponding to the position of the beam on the screen of the electron beam device, the output of which is connected to the second input switchboard. The output of the line parity determiner is connected to the third input of the switch, the output of which is connected to the input of the video signal generation unit.

 As a block delay pulses corresponding to the position of the beam on the screen of the cathode-ray device, a logical pulse inverter can be used.

 Figure 1 is a block diagram of the proposed device; figure 2 is a diagram illustrating the formation of a raster in the device prototype; figure 3 is a diagram illustrating the formation of a raster in the proposed device.

 The proposed device for creating pulses that control the formation of a sampling raster on the screen of an electron beam device (ELU) includes a block 1 for generating pulses corresponding to the position of the electron beam on the ELU screen (BFIP), a block for generating a video signal (BFVS), line parity determiner 3 ( SFN), block 4 delay pulses corresponding to the position of the electron beam on the screen ELU (BZ), switch 5 (K).

 The output of block 1 is connected to the first input of the switch 5, the input of block 4 and the input of block 3, the output of block 4 with the second input of the switch 5, the output of block 3 with the third input of the switch, the output of the switch with the input of block 2.

 In this case, one of the inputs of the EXCLUSIVE OR element is connected as the input of block 4 to the output of block 1, and the second input as the input of block 5 to the output of block 3, the output of the logic element EXCLUSIVE OR is connected as the output of block 5 to the input of block 2. V a specific example, the logic element "EXCLUSIVE OR" is implemented on the chip K531LP5.

 The proposed device operates as follows.

 Block 1 forms a sequence of pulses corresponding to the position of the electron beam on the ELU screen. These pulses are fed to delay unit 4, to line determinant 3 and to the first input of switch 5. In addition, delayed pulses are sent to the second input of the switch, and signals from the output of determinant 3 containing information about the parity of the raster line are fed to the third input. The output of the switch 5 under the influence of signals from the determinant 3 are alternately transmitted pulses from the first or second input of the switch. In this case, the pulses from the first input correspond to the odd lines of the raster, and the pulses from the second input are even. Pulses corresponding to even lines of a raster have a time shift relative to pulses corresponding to odd lines of a raster. The shift amount is determined by the delay unit 4.

 The pulses from the output of the switch 5 are sent to block 2, where a video signal is generated, which enters the ELU. At the same time, a raster is formed on the ELU screen with an offset of the elements of even lines relative to odd lines. The raster has a hexagonal structure (see figure 3).

 Due to this, the density of raster samples increases, which can significantly simplify the formation and processing of two-dimensional images. For example, the number of complex multiplications required for two-dimensional fast Fourier transform algorithms is reduced by 25% with respect to the prototype device.

Claims (3)

 1. INFORMATION SUMMARY PULSE FORMER ON THE ELECTRON BEAM TUBE (CRT) SCREEN, comprising a pulse generating unit corresponding to the position of the electron beam on the CRT screen and a video signal generating unit, characterized in that a line parity determinant is introduced into it, a pulse delay unit corresponding to beam on the screen of the CRT and the switch, and the output of the block forming pulses corresponding to the position of the electron beam on the screen of the CRT is connected to the first input of the switch, the input of the determinant NOSTA line and the input of pulse delay unit corresponding to the position of the beam on the CRT screen, the output of which is connected to the second input of the switch output line parity determinant is coupled to a third input of the switch whose output is connected to the input of a video signal.  2. The shaper according to claim 1, characterized in that the delay unit of the pulses corresponding to the position of the electron beam on the screen of the CRT is made in the form of a pulse inverter.  3. The shaper according to claim 1, characterized in that the switch and the delay unit of the pulses corresponding to the position of the electron beam on the CRT screen are made in the form of an EXCLUSIVE OR element.

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