network system and signal(tv signal and video signal)
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The document discusses different aspects of network systems and video signals. It describes how TV signals propagate through space using radio waves and three propagation methods depending on wavelength. It then explains the components of a composite video signal including camera signal, blanking pulses, and synchronizing pulses. Finally, it covers topics related to video signals for color such as desaturated colors, color video frequencies up to 1.5 MHz, and color voltage amplitudes.
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Chapter 23 television (1)
This chapter introduces television technology and covers:
- The components and modulation techniques used in TV signals, including amplitude modulation of the video signal and frequency modulation of the stereo audio signal.
- How a TV camera converts a visual scene into a video signal by scanning the scene sequentially into lines and transmitting the light intensity information.
- The frequency spectrum and channel assignments for TV broadcasting in the US, including VHF and UHF bands.
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1. The document discusses colour television systems and colour signal transmission.
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This chapter introduces television technology and covers:
- The components and modulation techniques used in TV signals, including amplitude modulation of the video signal and frequency modulation of the stereo audio signal.
- How a TV camera converts a visual scene into a video signal by scanning the scene sequentially into lines and transmitting the light intensity information.
- The frequency spectrum and channel assignments for TV broadcasting in the US, including VHF and UHF bands.
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This presentation is focused on basic understanding of video signal generation and its electronic interpretation. Contents are taken from bible of television!
This presentation is dedicated to R R Gulati.
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This document discusses the components and operation of a monochrome television transmitter. It begins by explaining that the modulated RF signal is amplified after modulation to increase the power level before transmission. It then describes the vestigial sideband filter, antenna system, and methods of positive and negative modulation. Noise interference is discussed in the context of these modulation methods. The document also covers the transmission of sound signals via FM and the advantages this provides over AM transmission in a television system.
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1. Television works by transmitting picture information over an electric channel through scanning and converting optical information into electrical signals.
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3. A television system consists of cameras that convert scenes into electrical signals, transmitters that broadcast the signals over radio waves, and receivers that convert the signals back into images on screens.
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2. It describes the NTSC, PAL and SECAM colour systems and how they modulate and transmit the colour difference signals.
3. Frequency interleaving is used to transmit the colour information by modulating the colour difference signals with a colour subcarrier frequency placed between harmonics of the line frequency.
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- 1. NETWORK SYSTEM AND SIGNAL Submitted By:- Submitted To:- Pro. Hemant Meena Khinya Ram(2013uee1597)
- 2. CONTENT TV SIGNAL PROPAGATION COMPOSITE VIDEO SIGNAL VIDEO SIGNAL FOR COLOUR
- 3. TV SIGNAL PROPAGATION Radio waves are electromagnetic waves, which when radiated from transmitting antennas, travel through space to distant places, where they are picked up by receiving antennas Although space is the medium through which electromagnetic waves are propagated, but depending on their wavelengths, there are three distinctive methods by which propagation takes place.
- 5. COMPOSITE VIDEO SIGNAL A composite video signal consists of: Camera signal - corresponding to the desired picture information Blanking pulses – to make the retrace invisible Synchronizing pulses – to synchronize the transmitter and receiver scanning horizontal sync pulse vertical sync pulse their amplitudes are kept same but their duration are different needed consecutively and not simultaneously with the picture signal – so sent on a time division basis
- 7. VIDEO SIGNAL FOR COLOUR Desaturated colours • Any colour is said to be desaturated when mixed with white • In a colour camera output signal, Red colour is desaturated to a small amount, then the Vg and Vb have lower values • But as desaturation of red increases, Vg and Vb values are increased • For 100% desaturation Vr = Vg =Vb
- 8. VIDEO SIGNAL FOR COLOUR Colour video Frequencies: • When the scene is not dominated by one or few colours the information to be transmitted occupies more frequency spectrum • It is discovered that colour frequencies need 1.5 Mhz band in order to transmit finest details of a scene • The luminance signal frequency range is up to 5 Mhz
- 9. VIDEO SIGNAL FOR COLOUR • Colour voltage amplitudes: