Unit 15

I. Выпишите из Прил.I значения следующих слов, запомните их:

instant (n), deal (dealt, dealt) with

II Выпишите из Прил.II значения следующих терминов, запомните их

time-base circuit

III. Сгруппируйте антонимы, переведите их;

1.Rapidly (adv), increase(v), send (v), brightness (n), separately (adv), transmission (n), amplify (v), complete (a), connect (v), different (a), large (a).

2. Reception (n), together (adv), darkness (n), receive (v), reduce (v), slowly (adv), weaken (v), incomplete (a), same (a), sma11 (a), disconnect (v).

IV. Прочтите текст, выберите соответствующую форму глагола из представленных в скобках, переведите текст:

A simplified presentation (представление) of a complete television system for the transmission and reception of picture and sound signals may be as follows. The television station (send, sends, sent) out two separate r-f carriers over a single antenna, one carrier being frequency-modulated by the picture information or video signal.

At the television transmitter the picture and sound signals are (deal, dealing, dealt) with separately. The television camera (focuses, focusing, focus) an optical picture of the scene upon an electronic camera tube, which (break, breaks, broken) down the image into its picture elements and (convert, converting, converts) the varying brightness of the individual elements into a corresponding electrical or video signal. It also (add, adds, added) several synchronizing signals to the video information. The composite (сложный) video signal is then (amplify, amplified, amplifying) by a number of video amplifiers. The carrier with its video information is sent over the TV transmitting antenna.

V. Прочтите текст, перечислите его основные положения:

TELEVISION (I)

1. The picture in a television receiver is produced by a type of cathode ray tube with a very large screen at one end. An electron beam scans the screen line by line in exactly the same way as the original picture was scantned in the television camera. The beam is deflected magnetically by two pairs of deflecting coils, one for horizontal scanning, one for vertical deflection. These coils are connected to the horizontal and vertical time-base circuits. The modulated wave from the transmitter is received and fed to the grid of the electron gun in the cathode ray tube-this controls the number of electrons striking each spot of the phosphor and thus the brightness of the spot on the screen. As the spot scans across the screen line by line a complete picture is built up in each frame.

2. The scanning in the receiver must be exactly in step (согласовывать) with the scanning in the camera, each frame starting and finishing at the correct instant. A series of synchronizing signals is transmitted to keep the camera and the receiver in step. The sound signal also has to be synchronized with the picture signals. Because a television receiver has to deal with much more information than a radio receiver it is a much more complicated instrument.

(1.300)