Various signals used in the test and

measurement of amplifiers signal-to-noise ratio /signal ta 'naiz

.reijiau/ [13] comparison of the level of the

wanted part of a signal with the unwanted

part

silica /'silika/ [26] silicon dioxide (SiO,):

used to make optical fibre cables silicon /'silikan/ [1] chemical element (Si)

used to make semiconductor components silicon diode /silikan 'daiaud/ [15]

electronic component made from silicon

(Si) which only allows current to flow in

one direction sine wave /'sain weiv/ [15] wave in the

shape of a smooth curve which shows the

relationship between an angle and its

mathematical sine ratio single (record) /'singl (,reka:d)/ [18] vinyl

record with only one piece of music

recorded on each side sky wave /'skai weiv/ [10] radio wave

which travels upwards to the ionosphere

where it is reflected back down towards

Earth

slanted /'sla:ntid/ [21] at an angle to slider /'slaida(r)/ [13] see wiper SLSI /,es el es 'ai/ [23] super large scale

Integration: between 104 and 10s active

components contained on one 1С chip smoke alarm /'smauk a,la:m/ [15] device

which gives a warning when it detects

smoke

smoothing circuit /'smu:dirj ,s3±it/ [5] electronic circuit for removing fluctuations in DC

snow /snau/ [21 ] interference to a video signal which causes small marks to appear

across the displayed image

software /'sDftwea(r)/ [29] programs and data used in computing

sound baffle /'saund baefl/ [13] wall within a loudspeaker unit for absorbing the sound coming from the back of the loudspeaker cone to prevent it cancelling out the sound coming from the front of the cone

sound track/'saund traek/ [20] magnetic

area where the sound signals are stored on

a recorded tape space wave /'speis weiv/ [10] unguided

wave which travels in a straight line

through free space speaker/spi:ka(r)/ [13,19] see

loudspeaker speaker system /'spi:ka .sistam/ [13] set

of loudspeakers and their associated

electronic circuits spec /spek/ see specification specification /spesifi'keijn/ [21] design

detail

spot /spot/ [19, 20] small circle of light

which is moved across a cathode ray tube

screen to build up a video image square wave /'skwea weiv/ [19]

waveform with each cycle having the

shape of a square squawker /'skwo:ka(r)/ [13] medium-sized

loudspeaker used for medium frequency

audio signals SSI /,es es 'ai/ [23] small scale integration:

up to 10 active components contained on

one 1С chip stabilising circuit /'steibalaizin ,s3:kit/

[5] electronic circuit which prevents the

Voltage level from varying stable /'steibl/ [24] in a balanced state stage /steid3/ [5] circuit block: section of

an electronic circuit with a specific

function

standby /'stasndbai/ [27] mode in which a device is waiting to receive a signal

static /'stastik/ n [16] electric charge produced by friction due to rubbing

Static /'staetik/ adj [21] fixed, not moving

step down /step 'daun/ [5] reduce in magnitude

step up /step 'лр/ [5] increase in magnitude stereo /'stenau/ [6] having signals for the

left- and right-hand speakers recorded as

two separate channels submarine cable /,sAbma'ri:n 'keibl/ [26]

transmission line laid under water on the

ocean floor supply rail /sa'plai 'red/ [1] conductor for

feeding the supply voltage to components