SU834740A1 - Device for displaying information on crt screen - Google Patents

Description

(54) DEVICE FOR DISPLAYING INFORMATION ON SCREEN OF ELECTRON BREAD TUBE

The field, the input of which is connected to the output of the control and synchronization unit, and the output - to the inputs of the image memory blocks of even and odd fields, the video signal switch and the input of the control and synchronization unit.

The drawing shows the block diagram of the proposed device.

The device contains a control and synchronization unit 1, a beam deflection control unit 2, a field characteristic pulse generator 3, an even field image 4 image blocks, an odd field image memory block 5, a video signal switch 6, an even field video amplifier 7. video amplifier 8 of an odd field, a cathode ray tube 9, an input information bus 10 (clock pulses and video signals from a computer and television sensors, such as a detected radio signal of a television broadcast).

The proposed device works as follows.

The control and synchronization unit 1 I synchronized with the input clock pulses from the input information bus 10, through the beam deflection control unit 2 simultaneously moves two beams of the double-beam electron-trache 9 in rows And to the field from left to right and from top to bottom as it is in television standard . Thus, the two beams of the double-beam cathode ray tube 9 draw on the screen simultaneously two lines of the reproduced image.

The generator of 3 pulses of a field, for example a trigger controlled by control and synchronization unit 1, is in one of two possible states determining for which (even or odd) field a video signal is received from bus 1 For an even field, a video signal from bus 10 through switch 6 the video signals controlled by the pulse shaper 3, the field, and the even-field video amplifier 7 is supplied to modulate the first LUCH of the two-beam cathode ray tube 9, which develops the even field, and r is recorded in the memory block 4 and images of even gender.

At the same time, the video signals from the output of the image memory block 5 are odd about the field recorded in it during the video transmission cycle for the even field. These read-out video signals through the video signal switch 6 and the odd-field video amplifier 8 are fed to modulate the second beam of the cathode ray tube 9, which distorts the odd field.

For an odd field, the video signal from the bus 10 is through a switch 6 video signals, controlled by the shaper of 3 impulses of the field, and the video amplifier 8 of the odd field to the post. It is used to modulate the second beam of the double-beam cathode ray tube 9 ,. it expands into an odd field, and is also recorded in block 5 of the image memory of an odd field.

| | | At the same time, the video signals from the output of the even-field image memory block 4, recorded in it during the video transmission cycle for the odd field, are read out. These read-out video signals through a switch b of video signals and an even field video amplifier 7 are supplied to modulate the first beam of the electron-beam tube 9, which develops an even field.

0 The frame reproduction cycles of the image from the even and odd fields alternate, cyclically repeating.

Record management and reading. from blocks 4 and 5 of image memory

5 even and odd fields are carried out by the control and synchronization unit 1 and the former 3 of the field indicator.

Claims (3)

1. For Japan No. 50-5897, cl. Ue F 3/14, published 1975. 2. US patent number 3766313, cl. About, About F 3/14, published. 1973. 3. For the Japan of Japan 50-23773, cl. C. About F 3/14, published. 1975 (.prototype).