ĐIỆN tử VIỄN THÔNG DTVT2 nhom8 bai7 khotailieu

Họ và tên : Nguyễn văn đại Trần văn tuất Đỗ mạnh cường Vũ anh cường Phạm hồng phái Lê văn hải 15 Drum mschine Task 1: I What do you think a drum machine does?. I think a drum mach

Họ và tên :

Nguyễn văn đại

Trần văn tuất

Đỗ mạnh cường

Vũ anh cường

Phạm hồng phái

Lê văn hải

15 Drum mschine

Task 1:

I What do you think a drum machine does?

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

2 What do you think these keys refer to on a drum machine?

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

Task2

a, DRUM b,MICRO

c,STRIP SOUND

E,SPEAKER

a) When the drum is hit, it produces sound waves

b) The sound waves reach the microphone and are converted into electrical signal

c) 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 d) 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

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

TASK5

1 With a drum machine, you can play any drum sound by (press)

PRESSING the right button

2 You can create drum music without (play) PLAYINGa drum

3 What we hear as sound are (change)CHANGING in air pressure

4 These are converted to electrical signals by (use)USING a microphone

5 The information contained in the drum machine memory consists of

(sample)SAMPLEING

of these electrical signals

6 A drum machine contains (record)RECORDING of sound taken at

measured intervals

7 This process is called (sample)SAMPLING

8 The functions of a drum machine include (pan) PA N I N Gand

(tune)TUNING

9 Panning means the (position)POSITIONING of the drum sound in stereo

TASK6:

1 a burglar alarm =AN ALARM by aburglar

2 a clock timer = the timer which run a clock

3 a mercury switch =

4 a car phone =the phone setups a car

5 a germanium diode

7 a ground wave

8 an assembly line

9 a fuseholder :device for holding an electrical fuse

10 a wavemeter :electronic instrument for measuring the frequency of a transmitted signal

11 a cellphone mobile telephone which communicates through base stations situated

12 Headphones device worn on the head which covers each ear with a small loudspeaker

13 an ammeter electronic instrument for measuring current

14 a handset

TASK7

digital wave?

YES ,IT IS

2 How many voltage level dose a digital singal have

3 What is an ADC?

IT IS an analogue-to-digital converter (ADC)

4 How frequently must an analogue signal be sampled when converting it to a digital signal?

The analogue signal is constantly varying, samples

of the original signal must be taken at successive intervals of time The magnitudes of the samples are changed into digital values by the ADC

Each binary digit used to show a binary value is known as a bit The accuracy of conversion is limited

by the number of binary bits used by the ADC

6 What effect do rounding errors have on a signal when

it is converted back to an analogue form?

The resulting digital signal is converted back to an analogue signal using a digital• to-analogue converter (DAC), these rounding errors will cause the analogue signal to suffer some

distortion