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Unit 1: electronics in the home
IC: integrated circuits
CD: compact disc
Hi-fi: high fidelity
Task 6:
An aerial is an electrical device which converts electric power into radio waves or
converts radio waves into electric power.
The tuner selects the required signal.
The detector seprate off the audio part of the signal.
The AF amplifier amplifies signal.
The volume control adjusting the sound level.
The power amplifier amplifies low-power audio signals.
The speaker produces sound.
Task 7: cấu trúc
The radio consists of/is composed of a tuner,a detector,and an AF amplifier.
The tuner connected to/is linked to the detector.
Task 11:
Fig. 3 shows the block diagram of an amplitude-modulated (AM) radio transmitter.
It consists of a radio frequency(RF) oscillator, a modulator , an audio frequency
(AF) amplifier, and an RF power amplifier. The RF oscillator generates an RF
carrier wave which it fed into the modulator.The microphone converts sounds into
audio frequency signals which are amplified by the AF amplifier . The modulator
then uses the amplified AF signal to modulate the RF carrier wave.The power of
modulated carrier wave is increased by the RF power amplifier. The strong
modulated output signals are fed to the aerial which enables them to be transmitted
over long distances.
Unit 5 : batteries
Task 5:
cau truc :
It is called/is known as a NiCad cell

Task 1: (hoc thuoc)
A: The musicans play in a recording studio. Each voice and instrument is recorded
using different microphones.
B: Each microphone input is mixed on a mixer. In a commercial recording studio
this is done by a sound engineer.
C: The instrucments are channelled through the mixer into a multitrack tape
recorder.
D: The sounds on the multitrack are remixed until the musicans are happy with the
sound.
E: During this process, effects, such as reverb, are used to shape the sound.
F: The output is recorded on a two-track mastering machine. The product is a
master tape with two stereo channels
Task 6: Describing a process
Firstly, a blank perpex disc is grinded and polished to optical flatness. Next, it is
washed and spin-dried. It is then coated with a thin layer of photorestist and cured
in an oven. After that, as the disc is revolved, a laser beam is used to mark the
audio information parttern on its surface. This process is know as ‘cutting’ the disc.
The photorestist is then developed and etched to produce pits in the disc’s surface.
These pits represent the digital audio pattern.
The disc is then given a thin silver coat to make it electrically conductive. Next,
Electroplanting is use to make a series of positive and negative copies of the
master
disc. The final negative copy is used to made a large number of identical CDs. The
surface of the CD containing the pit marks is then coated with a 10mmlayer of
aluminium followed by a protective layer of plastic. After punching the centrer
hole, a lable is applied and the CD is packaged.
Unit 9:alarm systems
Task 3:
Door switch
Window foil

Task 1:
Gamma rays – X rays – ultraviolet rays – visible light – infra red rays – radio
waves.
Task 2,3: surface wave sky wave space wave
Frequencies low below 30 MHz VHF,UHF
Travels along the ground skywards space
Range about 1500km thousand of up to 150km
kilometres is possible on earth
Difficulties energy is absorbed air molecules hills, buildings
from it by the ground or trees.
Task 11:
1.Aerial receives weak RF signals
2.RF tuner selects the required RF wave from those picked up by the aerial
3.RF amplifier amplifies the selected RF wave
4.Detector separates the audio modulation from the RF carrier wave
5.AF amplifier amplifies the audio signal to make is strong enough to drive
the loudspeaker
6.Loudspeaker converts the audio signal into sound
Unit 15: drum machine
Task 2:
1, When then drum pad is pressed, the stored information is decoded and produces
an electronic signal
2, The signal is sliced into many ’samples’, each one a snapshot of the strength of
the signal at one particular moment. This information is converted into
binary code and then stored in the machine’s memory
3, When the drum is hit, it produces sound waves
4, The signal is turned into sound waves through an amplifier, and the drum sound
is heard
5, The sound waves reach the microphone and are converted into an electrical
signal.

14,A handset = an electronic device which can be held in one hand
Unit 16:audio recording systems
Task 1:
LP: long playing record
CD: compact disc
Task 3:
LPs CDs
1 Recording system analogue digital
2 Sound quality poorer than the original near-perfect than the original
3 Access serial random
4 Audio pattern groove pits
5 Material vinyl perspex
6 Playing mechanism mechanical laser optical
7 Durability easily damaded high durablity
8 Size 12 inches 12cm
9 Playing time 45 minutes 74 minutes
Task4:
1,Distortion to high a recording level
2,Noise generated within components poor recordings
3,Overheating a transistor is damage
4,Dirty heads scratches on records
5,A build up of oxide on the head is the tape rubbing against the head
6,Jumping is hiss
7,Unwanted signals interference on radios
Unit 18:graphs
Task 1:Sales of sigles …… rose or decrease
(Slightly, Gradually, Steady, Steep, Sharp, Sudden, Fast)
Task 5:
1,Computers process data
2,You can record sound on tape or disc

A CRT is really a large vacuum tube valve. It has 3 main sections. The first section
is an electron gun which emits a stream of electrons. The electron gun contains an
electron lens which cause the electrons into a narrow electron beam.
The second section is a deflection system, which allows the beam to be moved
Vartical or horizontally. Oscilloscopes use charged metal plates to give
electron beam deflection, whereas television sets use electromagnetic coil to give
electromagnetic beam.
The last section is a screen whit a phosphor coating. The electron beam hits the
screen, making the phosphor glow and causing a spot to be displayed. The color of
the spot depends on the type of phosphor used.
Task 6: cấu trúc :
1,A magnetic tield is set up in the speaker coil causing the coil to be vibrates
2,The coil pushes and pulls the speaker cone making sound waves to be produced
Unit 20: high definition television
Task 2:
Feature Existing High definition
No. of line 625 1250
Width/height 4:3 16:9
Dots 120 000 480 000
Image normal high quality
viewing distance seven times three times
Sound high quality very high quality three dimensional sound
Task 3: cấu trúc
By the turn of the century such sets may be offering programmers in a choice of
languages.
Picture quality will be excellent
The move towards HDTV is likely to be very grandual.