Evolution of Television Technology: From Analog to Hybrid
Special Circuits and Synchronization
Synchronization is achieved by recovering the video signal’s sync pulses. Synchronization and horizontal sweep are responsible for image deployment, providing a horizontal signal. Functions are related to the high voltage generator, exciting the anode in the kinescope.
Modern TVs use switching power supplies to generate various voltages for different circuits. Erase and sync pulses function by sending a signal that occupies all the time, with thin sync pulses directly behind the information.
Early Experiments
Basic circuits with bulbs didn’t provide a sawtooth wave as fast as required for screen explosion, resulting in a gradual effect. Examining the sawtooth waveform reveals slight variations at the end of the main ramp, combined harmoniously due to the frequency response of the devices used. If a picture is taken on the left edge, Derache bands appear, affecting wing distortion and image quality. Horizontal pulse speed is 63.3 microseconds.
Color Television
Color TV required multiple electronic adjustments. John L. Baird invented a device with the three basic colors in 1928.
Principle of Operation of Cathode Ray Tubes
A cathode ray tube is a glass bulb with a high vacuum. One end has a cathode that, when heated by a filament, produces a cloud of free electrons. At the other end, a high-voltage anode attracts the electrons, establishing a current flow. The anode is close to a straight burning phosphorus screen, emitting light when struck by the circulating electrons, translating the electrical signal into a light image.
Trinitron Picture Tube
In the 1960s, Sony reversed and conducted research, advancing picture tubes beyond RCA’s traditional designs with Sony’s Trinitron. Features include:
- A single electron gun instead of three independent cathodes with displaced beams online, not in delta.
- Better defined colors.
- A large single focus lens instead of individual grids for each beam.
- Substitution of the shadow mask with an aperture grille, a stainless steel plate with slits.
- Use of gang phosphorus rather than triads.
- A cylindrical screen instead of a spherical one.
Control Systems
Control systems haven’t shown significant changes since their creation, but the TV receiver system has evolved from a completely analog device to a hybrid analog-digital system, offering a higher level of compactasion, new features, and controls. The control system affects certain stages of the TV but doesn’t intervene in the fundamental processes of the video signal, which passes through the image recuperator.
Questions and Answers
- Is that way the TV evolved over time? Formerly an entirely analog device and is now a hybrid.
- How can intervene in the SYSCOM important processes in the tv? If it better quality and ease of use to the user tv.