SU622130A1 - Device for displaying information on tv receiver screen - Google Patents

Description

characters associated with the read switch.

In the drawing, a block diagram of the devices is shown.

The device contains data entry unit 1, x, address colmutator 2, write switch 3, memory block 4 consisting of first 5 and second 6 drives and desh ftoro, 7 and 8 addresses, read switch 9, 10 character generator, block / 7 bitwise comparison, video signal generator 12, display unit 13, first 14 second 15 subtractors, symbol selection unit 16, control block 17, familiarity decomposition counter 18, familiarity counter 19, TV counters 20 and 21 lines of text.

The device works as follows M.

The EDC CRT is conditionally divided into fictitious acquaintances, and in block 4, MIAI, each familiarity has its own address. In the storage unit 5 of the memory unit, information is stored about the signs, which must start on odd horizontal lines of familiarity, and in drive 6, on even ones.

: Input mode Information signals from control unit 17 connect switch 3 of the terminal to address switch 2 on the block / data input. Information from the EV | M or from the keyboard via the data input unit, the address switch 2 and the switch 3 is recorded in the memory block 4.

The X coordinate codes in the address switch 2 are divided by n, where n is the number of decomposition elements in the familiarity, and the Y coordinate codes are divided by m, where m is the number of television lines in the familiarity.

The partial quotient of the codes serves as the address XY, according to which in; block 4, the data about the sign and the remainder of the division, which is the x, y coordinates of the beginning of the sign (upper left corner) are recorded (In the familiarity. If the pit numbers are multiples of the numbers "2, the division process consists in separating from the code. the addresses so many lower bits, what is the exponent of the number 2, these bits correspond to the X, y coordinates, and the higher bits to the XY d-block addresses memory addresses. N | tchetnye addresses U correspond to the drive 5, and even addresses and U - on opitelyu 6.

In the read-out mode of information on the CRT screen, IB at the beginning of the direct code of each line, the signals from the control unit 17 set the recording switch 3 to such a state that the familiarity counter 19 in the line and the counter of 22 lines of text is connected to the memory block 4. These counters conduct a continuous survey on | collectors 5 and 5. Counter 19 operates according to

module N, where N is the number of character tests on the line, and counter 2-2 is modulo M, where M is the number of familiarity lines. From drives 5 and 5, information about two characters is read at the same time, which should begin in two adjacent places, one below the other.

Codes g / and y, which determine the beginning of the sign (upper left corner) in the familiarity, from drives 5 and 5 are received respectively on subtractors 14 and 15 as a deductible. The second inputs of the subtractors, as decremented, get the codes of the current TV lines from the counters of 20 and 21 TV lines. The counters 20 and 21 work modulo 2 tons, while the counter 20 starts a continuous count from the first familiarity, and the counter 21 starts from the second. If m is a multiple of the degree of the number 2, then a single counter of television lines, modulo 2m, is sufficient for a wave.

The vertical position of the sign is fully determined by the difference between the current code of the TV and the lines and the coordinate code of the beginning of the sign y and y, which can be a negative number, zero or a positive number. A negative result of the subtraction means that the drawing of the mark has not yet begun. A positive result of a subtraction with a number less than t means that it is necessary to draw exactly this sign, and the number itself indicates the number of the line of the sign that is to be drawn at the moment -. The result, equal to “О, means the FORMATION of the first line of the character, equal to) - the second line of the character, and the result, equal to m, indicates that the drawing of the character is completed.

The symbol selection unit 16 determines, by the results of the subtraction, which of the two characters should be displayed at the moment, since in one familiarity along the vertical, two signs, partially, are placed, and connects the read switch 9 to the corresponding drive and evaluator. The code of the selected character and the line number through the readout switch 9 are fed to a 10-character generator, which outputs a television decomposition of the given character line to the driver 12 of the video signal.

The beginning of the formation of the sign on the X coordinate is determined by a one-to-one comparison unit, for which the input code X of the beginning of the sign in the familiarity field is input to one input, and the current inputs from the counter 18 are elements of the familiarity decomposition to the second inputs. Counter 18 of the decomposition elements of the sign-place works modulo n, where n is the number of elements of the television decomposition in one familiarity. The equality of the codes is fixed by the unit of random comparison, which is issued by the code on the formation of the television signal by the block 12 and its output to the display unit 13. Synchronization of blocks 12 and 13 is effected from control block 17.

The introduction of an address switch, subtractors, a block of symbol choices and a bit-wise comparison block made it possible to increase the accuracy of displaying sign information (CRI on a CRT by comparing with an irototype by n times along the X coordinate ъ times along the Y coordinate.

Claims (2)

1. USSR Author's Certificate No. 441578, G 06 K 15/20, 1974. 2. USSR author's certificate number 453720, cl. G 06 K 15/20, 1974.