Điện tử viễn thông DTVT2 nhom5 bai7 khotailieu

Drum machine

Task 1
1)

2)

I think a drum machine is an electronic musical instrument designed
to imitate the sound of drums, cymbals or other percussion
instruments. Drum machines are most commonly associated with
electronic music genres such as house music, but are also used in
many other genres. They are also used when session drummers
are not available or if the production cannot afford the cost of a
professional drummer.
I think
Kick (bass) : It usually begins in the rhythm. The drummer playing the
bass drum using the pedal. Pedals are attached to a hammer, or a stick to
beat the drum. And it is often called the kick drum (kick) for legs to beat
drums.
Snare : This is a miniature version of the bass drum, but the drummer
used drumstick to beat. Snare drums mounted on the underside of the
metal wire in the drum when hit. The wire has the effect of making
sonorous sound.
Closed hat and open hat : Open and closed hi-hat struck while the two
cymbals are apart or together (open or closed), while pedal hi-hat refers
to parts or notes played solely with the pedal used to strike the two
cymbals.

Task 2
a)
b)

c)

d)

When the drum is hit, it produces sound waves.
The sound waves reach the microphone and are converted into electrical
signal
The signal is sliced into many 'sample', 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.
When the drum pad is pressed , the stored information is decoded and
produces an electronic signal.


e)

The signal is turned into sound waves though an amplifer, and the drum
sound is heard.

TASK 4
Text 1: 2. The memory of a drum machine contains pre-recorded sounds from
drum kits.
6. Digital sound stays true to the original.
Text 2: 3. A microphone records sound by converting changes in air pressure
to electrical signals.
4. The patterns of the sound waves are matched by the characteristics
of the electrical signals.
Text 3: 5. Signals are sampled regularly and often and stored in binary form.
Text 4: 1. You don't need to play drums to make drum music you need only
touch the switches which match the sounds you want.

Text 5: 7. Pressing one of the buttons indicates to the processor the loudness
and speed of the music to be played.
Text 6: 8. You can't make a mistake with the beat because the drum machine
corrects any errors by itself.

TASK 5
1. With a drum machine, you can play any drum sound by pressing the right
button.
2. You can create drum music without playing a drum.
3. What we hear as sound are changed in air pressure.
4. These are convertedto electrical signal by using a microphone.
5. The information contained in the drum machine memory consist of sample
of these electrical signals.


6. A drum machine contains recording of sound taken at measured intervals.
7. This process is called sampled.
8. The functions of a drum machine include the tune and pan.
9. Panning means the position of the drum in stereo.

Task 6
1) A burglar alarm is a system designed to detect intrusion – unauthorized
entry – into a building or area. Security alarms are used in residential,
commercial, industrial, and military properties for protection against
burglary (theft) or property damage, as well as personal protection
against intruders. Systems range from small, self-contained noisemakers,
to complicated, multi-area systems with computer monitoring and
control.
2) A clock timer is book a time to remind a certain job
3) A mercury switch (also known as a mercury tilt switch) is a switch

which opens and closes an electrical circuit through a small amount
of liquid mercury.
4) A car phone is a mobile phone device specifically designed for and fitted
into an automobile.
5) A germanium diodes are a type that has been in use since the early days
of radio and although they have been largely superceded by silicon signal
diodes and integrated circuits, they may still be found as signal diodes in
older radio circuits, where they are used. It works in a similar way to a
rectifier diode in a simple power supply; it passes one half of the
incoming radio signal and blocks the other half. The main differences
being that the frequency of operation is much higher, also the voltages


6)
7)

8)

used in a demodulator are tiny by comparison to a mains (line) power
supply.
A ground wave is a surface wave that propagates close to the surface of
the Earth.
A block diagram is a diagram of a system in which the principal parts or
functions are represented by blocks connected by lines that show the
relationships of the blocks.They are heavily used in engineering in
hardware design, electronic design, software design, and process flow
diagrams.Block diagrams are typically used for higher level, less detailed
descriptions that are intended to clarify overall concepts without concern
for the details of implementation. Contrast this with the schematic
diagrams and layout diagrams used in electrical engineering, which show

the implementation details of electrical components and physical
construction.
An assembly line is a manufacturing process (most of the time called a
progressive assembly) in which parts (usually interchangeable parts) are
added as the semi-finished assembly moves from workstation to work
station where the parts are added in sequence until the final assembly is
produced. By mechanically moving the parts to the assembly work and
moving the semi-finished assembly from work station to work station, a
finished product can be assembled faster and with less labor than by
having workers carry parts to a stationary piece for assembly.

9) A fuseholders are devices for containing, protecting and mounting

fuses. Fuse holders come in two basic types, open or fully
enclosed. Open fuse holder types are fuse clips, fuse blocks,
socket and plug-on cap varieties. The fully enclosed variety may
use a fuse carrier that is inserted into a holder or have other means
to fully enclose the fuse.
10) A wavemeter, device for determining the distance between

successive wavefronts of equal phase along an electromagnetic
wave.
A cellphone is a phone that can make and receive telephone calls over a
radio link while moving around a wide geographic area. It does so by
connecting to a cellular network provided by a mobile phone operator,
allowing access to the public telephone network.
12) Headphones (or "head-phones" in the early days of telephony and radio)
are a pair of small loudspeakers that are designed to be held in place
11)

close to a user's ears. They are electroacoustic transducers, which convert
an electrical signal to a corresponding sound in the user's ear.
13) An ammeter is a measuring instrument used to measure the current in a
circuit. Electric currents are measured in amperes (A), hence the name.
Instruments used to measure smaller currents, in the milliampere or
microampere range, are designated as milliammeters or microammeters.
14) A handset is a device that a user holds to the ear to hear the audio sound
through the receiver.
Task 7
1) A sine wave an example of an analogue wave.
2) A diagital signal have two levels.
3) An ADC (analogue-to-digital converter) the analogue signals produced by
transducers can be changed into digital signals.
4) when an analogue signal is converted to a digital one, there is a
process in which the analogue is always varying and the
magnitudes of the samples are changed into digital values by an
analogue-to-digital converter (ADC).
5 )“binary digit” means a digit with two numbers.

DO TUẦN TRƯỚC BỌN EM GỬI MAIL NHƯNG DO LỖI NÊN
BÀI RADIO TUẦN TRƯỚC CHƯA NỘP ĐƯỢC,NAY BỌN EM
XIN GỘP CÙNG BÀI RADIO.

RADIO
Vocabulary
Appear …………………….xuất hiện
Actual ………………………thực tế
Application ……………….ứng dụng
Alphanumeric ……………ký tự

Cost …………………………chi phí
Circuit ……………………..mạch điện


Classify ……………………phân loại
Digit ………………………..con số
Denote ……………………..ký hiệu
Electrolytic capacitor ….tụ hóa
Ease ……………………….làm giảm bớt
Electromagnetic wave …...sóng điện từ
Enable ……………………..cho phép
Electrolytic ………………..điện phân
Exist ………………………..tồn tại
Extreme ……………………cực
Employ …………………….dùng
Fact …………………………thực tế, sự thật
Figure ………………………hình dung
Finally ………………………cuối, sau cùng
Grey ………………………..xám
General purpose ……….thường dùng
Limited…………………….. giới hạn
Light emitting diode …… phát quang
Letter ……………………… chữ cái
Range …………………….. dãy, loạt
Resistor ……………………điện trở
Impedance ………………. trở kháng
Reflect ……………………. phản ánh
Range …………………….. dãy, loạt
Reach …………………….. tới
Relaxing the tolerance . du vi sai số

Preamp……………………. tiền khuếch đại
Poor manufactory …….. sản xuất tồi
Power amp ………………. KĐ công suất
Production ………………. công việc sx
Position ………………….. vị trí
Produce ………………….. sản xuất
Positive terminal ………. cực dương
Product …………………… sản phẩm
Prefer …………………….. thích hơn
Power rectifier diode … diode chỉnh lưu
Particular ………………… riêng biệt
Satisfactory …………….. thỏa đáng
Semiconductor ………… chất bán dẫn
Seem ……………………… trong có vẻ
Tuning-in
Study this diagram. Name five things, other than radio which make use of
electromagnetic waves.
Rays ………………………..tia
Gamma rays ……………..tia Gamma
Ultraviolet rays…………..tia cực tím
Infra-red rays …………….tia hồng ngoại
Radio waves ……………..sóng phát thanh
Wavelength ………………bước sóng
Short wavelength……….bước sóng ngắn
Long wavelength ……….bước sóng dài
Low frequency …………..tần số thấp
High frequency ………….tần số cao

Visible light ……………….ánh sáng nhìn thấy được
TASK2
Table 1

Surface wave

Frequencies (tần số)

low frequency

Travels (đường truyền)

along the ground

Range (khoảng cách)

1500km

Difficulties (khó khăn)

absorption by the ground

TASK3
Table 2

Sky wave

Space wave

Frequencies (tần số)

below 300MHz

VHF, UHF

Travels (đường truyền)

Task 4 :

1
2
3
4
5
TASK 5
1.

a. transmitting aerial
e. surface wave
d. space wave
c. sky wave
b. receiving aerial

Skywards and returned to
earth by the ionosphere

line of sight
transmission

a

The switch is closed

b

Current flows through the primary of the transformer

When the switch is closed, current flows through the primary of the
Transformer
2.
a

The radar signal strikes a plane

b

The radar signal is reflected

On striking, The radar signal is reflected
3.
a

A cell discharges quickly

b

A cell may become hot

When discharging quickly, A cell may become hot
4.
a

The TV receives signals from the remote control

b

The TV follows your instructions

On receiving signals from the remote control, the TV follows your instructions.
5.
a

The radar receiver receives the reflected signal.

b

The signal is compared with the transmitted signal.

On receiving the reflected signal, the signal is compared with the transmitted
signal.
6.
a

You choose a course in electronics.

b

You think carefully about your future.

When choosing a course in electronics, you think carefully about your future.


7.
a

Microwave signals strike a high building

b

Microwave signals are deflected

On striking a high building, microwave signals are deflected.
8.
a

You make a recording

b

You should ensure the recording levels are satisfactory

When making a recording, you should ensure the recording levels are
satisfactory.
9.
a

The alarm detects an intruder

b

The alarm triggers an audible warning.

On detecting an intruder, the alarm triggers an audible warning.
10.
a

The remote control button is pressed

b

The television set changes channel

On pressing remote control button, the television set changes channel.
Task 7 :

Verb

Noun (component)

Noun (property)

Absorb

Absorber

Absorption

Attenuate

Attenuator

Attenuation

Communicate

Communicator

Communication

Conduct

Conductor

Conductivity

Induct

Inductor

Induction


Modulate

Modulator

Modulation

Reflect

Reflector

Reflection

Resist

Resistor

Resistance

TASK9

1 : AF

audio frequency

2 : RF Radio frequency
3 : AM

Amplitude modulated

4: FM

Frequency modulated

Task 10: Identify the wave . Use these terms
a : RF carier
b: AF signal

c: AM carrier
d: FM carrier
FM
- Frequency modulated
- High frequency ( 76 MHz – 130 Mhz)
- Signals near

AM
- Amplitude modulated
- Low frequency ( 30KHz – 16MHz)
- Signals travel farther

Task 11:
Component
Aerial

Function
Receiver weak RF signals

RF tuner

Modulater Rf carrier

RF amplifier

Amplifier RF wave


Detector

Detect RF signal

AF amplifier

Amplifier AF signal

Loudspeaker

Convert the audio signal into sound

TASK 12
Radio waves are very popular in today's life. It was used extensively in the field of
communication today. Here are all described block diagram of a simple radio receiver.
Diagram includes seven components. Aerial is receiving antenna, receiver RF carrier
is modulated and put into an amplifier. Audio signal is separated from the carrier and
into the audio signal amplifier and power amplifier signal. audio signal after
amplification was converted and emitted speakers.
12