Difference between Monochrome and Color Television?

Monochrome monitors actually use two colors, one for the display image and one for the background But Monochrome generally indicates a black and white picture. Monochrome аlso known as black and white television.

But Color television is the technology and practices associated with television's transmission of moving images in color, Color TVs have 3 guns red, green, and blue. Varying these tubes give you the full spectrum of color.

Therefore, a television that transmits images in color called color television and a television that transmits images into black and white are called Monochrome.

Monochrome describes paintings, drawings, design, or photographs in one color or shades of one color.

Color television is the technology and practices associated with television's transmission of moving images in color. MONOCHROME: it is a single color display images. Often green, red, amber, red or white. COLOR TELEVISION: a television that transmits images in color.

Color television is the transmission and reception of images in full color. The color television system can produce programs both in color on color receivers and in black-and-white on monochrome receivers. In addition, color receivers receive monochrome pictures when they are being transmitted. Color transmission contains two basic components — brightness infer motion and color information. Red, green, and blue are the colors that air chosen for color television.

Color cameras. In a color camera an optical system separates the red, green, and blue image components of a picture and concentrates these three components in separate but identical color camera tubes. Thus, the output of one tube reacts to the red light image; another — to the green, and another — to the blue light image.

Color kinescope. In a monochrome kinescope a single electron gun produces an electron beam. The brightness is controlled by an electron grid, which changes the electron beam density.

In a color kinescope three electron guns produce three electron beams which are synchronized. The intensities of beam are controlled by the voltage corresponding to the green, red, and blue components respectively of the colour picture. Color television signals can be transmitted over the same distance as monochrome television signals since the radio-frequency carrier frequencies in color television transmission are the same as in black-and-white transmission. Color video information in the signal being transmitted does not сhange the operational characteristics of the television receiver.

The structure of a color television receiver is far more complex than that of a monochrome one. Naturally, it requires more servicing than a monochrome receiver.

As to the power consumption, the color television receiver consumes more power than the black-and-white receiver. To be exact, it consumes About one and one-half times as much power. It is natural that it should consume more power because it contains more receiving tubes and circuits. The total power consumption of a color television receiver is between 300 and 400 watts while that of a black-and-white — from 150 to 250 watts. It is practically impossible to convert a black-and-white receiver to receive colure broadcasts.

To do it would require a great deal of special components since the color tube and its auxiliary parts are very special. At the same time a color television receiver does not require any special antenna or other components as a part of installation.

The antennas now in common use with a monochrome television receiver will be usable with the color receiver if the station or stations transmitting color programs are the same as those transmitting monochrome pictures. Thus, there is no need to produce special antennas for color television reception. If the color television receiver is tuned to the frequency of the monochrome transmitter, it reproduces monochrome transmissions.

 

II. Answer the following questions:

1. What basic components does color transmission contain?

2. What images does a monochrome receiver receive?

3. What images does a color receiver receive?

4. How many components does an optical system concen­trate?

5. What are they?

6. What component changes the electron beam density?

III. Read and translate the text

Vacuum Tubes

1. The science of electronics now deals almost exclusively with transistors and other solid-state devices. However, vacuum tubes were the principal building blocks of electronic circuits until approximately 1955. Briefly, a vacuum tube.consists of several metal electrodes of various shapes all packaged inside a glass or metal envelope that is highly evacuated. Vacuum tubes are often called thermionic "valves". A red-hot metallic electrode (the filament or cathode) emits electrons, which are attracted to a positively charged electrode called the plate or anode. The electrons pass through the spaces in a metallic grid electrode on their way to the plate, and the voltage on the grid controls how many electrons reach the plate. A simple thermionic valve is called a diode because it has two electrodes. A triode is a valve with three electrodes, an anode, a cathode and a control grid. A tetrode has four, and a pentode – five electrodes.

2. Vacuum tubes are still used in oscilloscopes, television sets, high power high frequency radio transmitters, and in some special low noise amplifiers. However, every year sees a larger number of applications being transistorized. It is probably safe to say that this trend will continue in the future, as there is presently a great deal of technological development being put into solid state electronics and rather little put into vacuum tube electronics.

3. As a general rule, vacuum tubes are inferior to modern solid-state devices in many ways. Vacuum tubes are much larger. They require considerably more electric power to operate. However, they can handle high voltages and high powers at high frequencies somewhat more easily than solid-state devices. They are also capable of withstanding temporary overloads in voltage or current, which would permanently destroy6 a solid-state device, and then returning to normal operation.

Notes:

principal building blocks – основные стандартные блоки

packaged inside an envelope – заключенный в баллон

inferior to modern solid state devices – уступают современным твердотельным приборам

to handle high voltages and high powers – оперировать высоким напряжением и высокой мощностью

to withstand temporary overloads – выдерживать временные перегрузки

would permanently destroy – неизменно разрушает