SU1443209A1 - Device for introducing alphanumeric information into displayed color televison image - Google Patents

Abstract

Invention relates to television. The purpose of the invention is to reduce the distortion of the television image. The device contains a character generator 1, a voltage divider 2, a filter 3 lower parts, a shaper 4 indication zone pulses, a band pass 5, an inverter 6, keys 7 and 8, adders 9 and 10, a video monitor 11. The goal is achieved by eliminating switching noise in the form of edging characters alphanumeric information using the entered divider 2 and filter 3. 2 nl. F (L

Description

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The invention relates to television and can be used in video recorders when displaying alphanumeric information about the time and time code on the screen of a video monitor.

The purpose of the invention is to reduce the distortion of the television image by eliminating the switching noise in the form of edging characters of alphanumeric information.

FIG. 1 is an electrical block diagram of an alphanumeric information input device in a reproduced color television image; in fig. 2, the waveform at various points in the circuit. The device for inserting alphanumeric information into the reproduced color television image.

The device for inputting alphanumeric information into a reproducible color television image contains character generator 1, voltage divider 2, low-pass filter 3, shaper 4 of indication zone pulses S band-pass filter 5, inverter 6, first key 7, second key 8, the first adder 9, the second adder 10 and the video monitor monitor 11.

The first input of character generator 1 is the input of the address-time code. The first and second inputs of the imaging unit 4 pulses of the indication zone are respectively an input of field synchronization pulses and an input of line synchronization pulses. The input of the first key 7 is combined with the input of the bandpass filter 5 and is the input of the video signal. The output of the band-pass filter 5 is connected to the first input of the second adder 10. The output of the genset 1 is connected through a serially connected voltage divider 2 and the low-pass filter 3 is connected to the second input of the second adder 10. The output of the second adder 10 is connected to the input of the second key 8. 4 pulses of the indication zone are connected to the second input of the character generator 1, to the control input of the first key 7 and through the inverter 6c to the control input of the second key 8. The first input of the first adder 9 is connected to the output of the first key 7, the second input d the first adder 9 connect

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The output of the first key 9 is connected to the input of the video monitor 11. The device for inputting alphanumeric information into the reproduced color television image works as follows. I

The digitized time data and frame numbers of the address-time code arrive at the first input of the character generator 1 (Fig.2a, b), to the second input of which there are pulses of the indication zone (Fig.2i) determining the position of the data line video monitor monitor 11, so that the output of character generator 1 generates a pulse signal of alphanumeric information (Fig. 2c), which is located in a given part of the image on the screen of a video monitor. At the same time, the alphanumeric information signal with black and white levels and fronts durations received on television is obtained by dividing the output signal TTL signal of the character generator 1 by its voltage and then processing it with a passive low-pass filter 3 (Fig. 2d). . At the output of the voltage divider 2, a black and white alpha-numeric signal is generated, changing from black level to white level, after being processed by low-pass filter 3, it is combined in the second adder 10 with a chroma signal filtered from the input video signal (Fig. 2e). ) and is fed to the input of the second key 8, which through the inverter 6 is controlled by the pulses of the indication zone, ensuring the passage of the alphanumeric information signal to the output of the second key 8 only in a given indication interval (Fig. 2g). At this time, in the first key 7, the input video signal is interrupted for a predetermined indication interval (Fig. 2e). The output signals of the first 7 and second 8 keys are combined into a common video signal containing alphanumeric information (FIG. 2h), which is fed to the input of the video monitor 11, on the screen of which a color image is formed with an inserted portion containing time and number data frames read from a magnetic tape or received from the transfer code.

address-time Formula of the invention The device for inputting alphanumeric information into a reproduced color television image containing a character generator, the first input of which is the input of an ad-res-time code, a driver of the indication zone, the first switch, the second switch, a band-pass filter, an inverter, the first adder, the second adder, a video monitor, the input of which is connected to the output of the first adder, the first and second inputs of which are connected respectively to the outputs of the first and second keys, the input of the first key is combined with the input of the bandpass filter and is the input of the video signal, the output of the bandpass filter is connected to the first input of the second adder, the output of the Ui

Secondly, it is connected to the input of the second key, the first input of the pulse generator of the indication zone is the input of field synchronization pulses, the second input is the input of line synchronization pulses, and the output is connected to the control input of the first key and the second input of the character generator,

0 characterized in that, in order to reduce the distortion of the television image by eliminating the switching noise in the form of character edging alphanumeric information, serially connected voltage divider and low-pass filter are introduced, the input of the voltage divider is connected to the sign generator output, the filter output the lower frequencies are connected to the second input of the second adder, and the output of the pulse former of the indication zone is connected via an inverter to the control input of the second key.

Claims (1)

Claim 5 A device for introducing alphanumeric information into a reproducible color television image containing a character generator, the first input of which is an address-time code input, an indication zone pulse generator, a first key, a second key, a band-pass filter, an inverter, a first adder, a second adder, and a video control a monitor whose input is connected to the output of the first adder, the first and second inputs of which are connected respectively to the outputs of the first and second keys, the input of the first key is combined with the input of the strip of the filter and the video signal is input, the output bandpass filter is connected to a first input of the second adder output to □ which is connected to the input of the second key, the first input of the pulse generator of the display zone is the input of the field synchronization pulses, the second input is the input of the line synchronization pulses, and the output is connected to the control input of the first key and to the second input of the character generator, characterized in that, in order to reduce distortion a television image by eliminating switching interference in the form of edging characters of alphanumeric information, a voltage divider and a low-pass filter are connected in series, the input being voltage elitelya character generator connected to the output, the lowpass filter output is connected to the second input of the second adder and an output of the pulse of the display area through the inverter connected to the control input of the second key.