Matushita Corporation
Sweeping system Television scanning system including synchronizing circuit, line-scan circuit, field scan electric circuit, teletron and feed circuit. Sweeping system's leading role is causes on teletron's fluorescent screen to form the normal diffraction grating.
The amplitude selection electric circuit use synchronized signal in the entire television signal the scope highest characteristic, takes the composite synchronizing signal the integrated circuit to be bigger than by far using the field synchronizing signal width the good synchronized signal width the characteristic,Google TV Remote separates the field synchronizing signal from the composite synchronizing signal, controls the field scan electric circuit, realizes the television field scan synchronization.
Integrated circuit's separation way also said that the width separates the AFC electric circuit function is the automatic solid present synchronization. The principle is takes out the good synchronized signal from the composite synchronizing signal,Android TV Remote feeds back the line frequency denticle with this aircraft good output stage to plate the signal to carry on the comparison, then the outlet error control voltage adjusts the line scan the frequency and the phase, solid present television synchronizing circuit. Power circuit
The television power circuit's function is 220 V alternating voltage which provides the television carries on the live pressure (voltage dropping), then after the rectification, the filter, the constant voltage, obtains conforms to request stable DC voltage supplies various part of electric circuits.
Japanese Matushita Corporation promotes “the universe television”. This system's picture breadth 3.6 meters, the height 4.62 meters, are equal to 210 inches, may lay aside on the large-scale truck, in the avenue and the square and so on place broadcast which needs.Safety surface In the system has used Matushita own development “the high brightness colored photo tube”, even if is the daytime, in outdoor can also obtain the color to be bright, bright image.
on March 17, 1985 Holds in Japan at the Tsukuba science international exposition, Sony Corporation constructs the ultra large screen colored bank of television monitors presents. It located at the concourse, the length 40 meters, the height 25 meters, the area amounts to 1000 square meters, the entire construction has 14 story of buildings to be so high. Quite 1857 inch color televisions. The ultra large screen is composed of 36 large-scale luminescent screens, each weight 1 ton, the depth 1.8 meters 4 line of 9 works altogether have 450,000 colored luminous elements. Through its top-mounted camera, may momentarily demonstrate that on the conference site each kind of activity, and broadcasts Sony Corporation's each kind of advertisement video recording.
in 1985 British Telecommunication Company (BT) promotes the synthesis digital communication network. It provides the voice, the fast transmission graph, the facsimile, the slow scanning television terminal to the user and so on. on November 25, 1991 Japan Sony Corporation's high-definition television starts to test broadcasting: Its scan line is 1125, compared to present more than 525 one time,Stadium seating the picture quality enhanced 100%;
The picture aspect ratio changes the tradition 9:12 is 9:16, strengthened the watch scene feeling; The even machine angle of view expands from 10 degrees to 30 degrees, reflects the chart to have the depth perception; The television facial features “the picture element” increased from 280,000 is 1,270,000 unit area picture information content enhanced nearly 4 times at one fell swoop ......Therefore, the onlooking high-definition television's distance was not past screen high 7 times, but was 3 times, and the sound accompaniment was lifelike, used 4 sound track high fidelity stereo sound, rich power.