SU124002A1 - Simultaneously-consistent color television system - Google Patents

Description

The novelty of the proposed color television system is that, due to the applied principle of alternate signal transmission of the most ityro-band (red and green) component images, the need to use complex types of modulation, coherent detection and matrix circuits is eliminated. Wobble rays can improve image clarity, which is reduced due to the use of progressive scan with a reduced number of lines. In addition, due to the transmission of the blue component only during the transmission of the red component, the signal of which is statistically less than the signal of the green component, the channel overload is eliminated. In the proposed color television scheme, the color separation of the red and green components occurs with a succession of interlaced lines on the carrier frequency. The signal from the back of the component is transmitted in a narrow band of frequencies on the subcarrier frequency. To eliminate row slip, it is proposed to apply a progressive decomposition of a 1n-1 image into an odd number of rows. A raster of each color image (color field) is formed over two floors by regular interlaced scanning. In order to restore the full vertical definition of the image, a synchronous wobble of the rays of the tubes in nanometer is used at the ends of the system.

Phasing of the wobbling frequency at the receiver is performed by sync sync synchronizing pulses, the falling edge of which at the transmitter is out of phase after every two half of the half wobble period. For this purpose, it is proposed to apply a pulse width modulation of horizontal sync pulses. To eliminate channel overload, the ratio of the magnitudes of the signals of green and red color separation images is set equal to the ratio of their brightness coefficients. In addition, it is proposed that the signals of the blue component be transmitted through the line simultaneously with the transfer of the red color-separated image.

In the drawing, a block diagram is presented in a simplified form: 1a, the front part of the proposed system; the signals of green and red color separation images are transmitted after gamma predictors / to the electronic switch 2, from the output of which both signals alternate along the lines are fed to the remote switch channel. The blue color separated image also, after gamma precorrection, is reduced across the low-pass filter 3 and modulates the sub-carnal frequency in modulator 4. In mixer 5, alternating green and red separated signals are shifted from the subcarrier amplitude-modulated by the third signal and form a full signal, coming to the transmitter 6. The Bloxham also contains a sync generator 7 and generator 8.

Subject invention

At the same time, a color television system with sequential alternation of green and red color-separated image signals in rows, transmitting blue color-separated image signals in a narrowed frequency band at a subcarrier frequency with progressive scanning of a raster by an odd number of lines, which, in order to simplify receiving and transmitting devices while maintaining the vertical definition of a color image, the synchronous wobble of the transmitting and receiving tubes was applied by Hovhan schirotnoimpulsnoy modulation of line synchronizing pulses and for ustrapenn overload amplitude channel response signal "blue color separation image is transmitted simultaneously with the signal of" red color separation image signals and otnoscheniya Range "green and" red color-separated images is otnoscheniya their luminance coefficients.

Blue

Red

3

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