SU1753621A1 - Device for introducing index signals of tv programs into videosignal of test chart - Google Patents

Abstract

The invention relates to television technology, in particular, to displaying digital and alphabetic information in a television image. The purpose of the invention is to simplify the device by reducing the number of coding units. The clock generator 1 controls the operation of the video signal source 2 of the test table and the index signal generating unit 8. From the outputs of the video signal source 2 of the test table, the signal is fed to the inputs of the video signal generation unit of the test table through the delay unit 3 and through the coding unit 4. From the output of the video signal generation unit of the test table, the signal enters the distribution amplifier and b signals and then by the number of television signals programs of adders 7.1 ... 7.P, to the second inputs of which signals from the outputs of block 8 of forming the index signals are supplied. 5 il.

Description

Lh

(L

WITH

x |

eat s

o you

The invention relates to television, in particular to digital and alphabetic information display devices on a television image.

Caption injection devices and an image signal encoded with the SECAM system are known. In such devices, for introducing digital or alphabetic information into the signal, the full signal is divided into luminance and chrominance signals, then the Chromaticity signals are demodulated to obtain color difference signals. The luminance and color difference signals are mixed with alpha and numeric signals. Mixed color difference signals produce modulation of color subcarriers in the encoder. Then the sum of the luminance and chromatic signals obtained as a result of mixing is added. At the output of the device, a complete television image signal is obtained, containing the titles. If you need to have n identical images containing n different titles, belonging to different TV programs, you will need n sets of mixing luminance signals and color difference signals with n signals of titers, n encoders, and n adding luminance and chrominance signals resulting from mixing.

 It is also known a device for generating a signal of a universal electronic test table of the CG 0167 (block diagram in FIG. 1). The device contains a synchronous generator 1, the first output of which is connected to a video spreadsheet signal source, a second output connected to a titer shaper 7, a table video signal source 2, the first input of which is connected to a synchro generator, a second UIT shaper unit, the first EIT video signal unit which through the encoder 3 is connected to the first output of the video signal source of the table, the second input through the delay line 4 is connected to the second output of the video signal source of the table, amplifier predelitel 6 with n outputs for supplying the signal to the inputs of n transmitters.

In order to introduce into the signal a universal test table of signals of indices n television programs, n EIT sensors are required (Fig. 2).

- The disadvantage of this method of introducing the indexation of television programs is the need to have n sets of expensive equipment for generating EEIT signal.

The aim of the invention is to simplify the device for introducing indexes of television programs into the video signal of the test table by reducing

the number of equipment included in the EEIT sensor: EEIT signal conditioners, encoders, delay blocks.

This goal is achieved by the fact that

0 the signal of the universal test table is summed up with n indices of television programs in passive adders at the n outputs of the output amplifier of the EEIT sensor with the video signal already fully formed by the SECAM system and fed to the inputs of the n different transmitters (Fig. 3).

The block diagram of the device for introducing signals from television program indices into video deosignal of the test table embedded in the ORPS is shown in FIG. 4.

The synchronization signal from the clock generator 1 is fed to the source 2 of the video signal of the universal test table. Device 4 encodes the color component of the table signal. After passing through the delay lines 3, the luminance signals are added in block 5 of forming the video signal of the EIT with the chrominance signals and are then transmitted to the output distribution amplifier. From the outputs of the amplifier, signals of a positive polarity with a scale of 1 V to an RH of 75 Ohms are transmitted via cable to

5 transmitters. At the same time, the synchronization signal from the synchronous generator 1 is fed to a device for generating signals of TV program indices, in which indices are generated: 1 P - the first common

0 program; 2 P - the second all-program; MP-Moscow program; O P - educational program; L P - Leningrad program.

Signals of TV program indices of the positive polarity with a 4V span are applied through resistors R 750 Ohms to the cables through which the signal of the universal test table is fed to the corresponding transmitters. Due to the common synchrographic signal, the identification signals are located exactly in the squares of 3-3 and 3-rd image of the table (Fig. 5).

The use of a TV program index entry device in the video of the nutritional table allows you to quickly find the desired TV program on a modern TV with a sensory selection of programs, especially during interruptions in broadcasting, when the same electronic test table is transmitted over all programs. Program identification makes it easier to set up televisions when buying or repairing at home and in the hospital, especially if the television receives or receives a signal from large TLSKD collective television systems, where channel conversion is widely used. In this case, 1-program is accepted not on 1 channel, but on 12,2-program is not on 11, but on 2, etc. The transmitting center that uses the device for introducing indexes of television programs into the video signal of the test table, it is enough to have one EEIT sensor, otherwise, each program would need to have its own EEIT sensor.

Under the ODP conditions, the invention allows the provision of signals from a universal spreadsheet with an appropriate index of five transmitters, using one sensor of the spreadsheet to do this and thereby saving four sensors containing a separate index.

Claims (1)

The invention of the device input signals index television programs in the video signal test table containing a synchronous generator, the first output of which is connected to the input source of the video signal of the test table, and the second output - to 5 to an input of an index signal generating unit, a video signal generating unit, the first input of which is connected via a delay unit to the first output of the video signal source of the test table, the second The output 0 of which is connected via a coding unit to the second input of the video signal generation unit of the test table, a video distribution amplifier, characterized in that 5 simplifying the device by reducing the number of coding blocks, n totalizers were entered (where n is the number of television programs), the first inputs of which are connected to the corresponding outputs of the amplifier — video output limiter, whose input is connected to the output of the video signal conditioning unit, the second inputs of the adders - to the corresponding outputs the signal conditioning unit of the indices, and the outputs of the sum 5 tori are the corresponding outputs of the device for inputting the television program indices signals to the video signal of the test table. ®U2 2. a t t t d t IK 9 and wedge 9 Hpimyipxu i w w FIG. five The black 2 Reverse / Pini F to c t sh w g Gray