A drum machine imitate the sound of drums and percussion instruments 2.. Closed hat and open hat, snare, kick are percussion instruments and Drum machine imitate the sound of them Task 2
Trang 1NHÓM 1 – LỚP Đ8-ĐTVT 2
Lesson 7: Drum machine
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Task 1:
1 A drum machine imitate the sound of drums and percussion instruments
2 Closed hat and open hat, snare, kick are percussion instruments and Drum
machine imitate the sound of them
Task 2:
a- c
b- e
c- b
d- a
e- d
Task 3:
Reading 1
a analogue recording – paragraph: 2
b what quantize means – paragraph: 6
c the advantage of digital sound – paragraph: 4
d what happens when one the drum buttuns is pressed – paragraph: 5
e how sound samples samples are stored in a drum machine – paragraph: 3
f in brief what the machine does – paragraph: 1
Reading 2
a Changes in pressure of the air around us are what we hear as sound
Task 4:
1 By pressing the pads which corresspond to particular sounds, you can create your own songs and rhythms withoout ever touching a drum kit
Trang 22 The machine’s read- only memory (ROM) stores sounds which have been pre- recorded from the original instruments
3 When we hear sound, our ears are detecting changes in air pressure These changes
in pressure , which might be caused by vibrating a guitar string or banging a drum , are sound waves To the record these, the wave patterns in the air are
converted by a microphone into electrical signals
4 The voltage and frequency of these signals correspond exactly to the fluctuations
in pressure of the original wave
5 Measurements are taken at frequent regular intervals and then recorded as binary code
6 Sounds recorded in this way remain accurate
7 When you press one of the drum pads, how hard you press and for how long, tells the microprocessor how loud ang at which tempo the sound should be
8 If you hit a note a little ahead or behind the beat, the machine will automatically place the drum hit right on the beat
Taks 5:
1 With a drum machine, pressing the right button, you can play any drum sound
2 Without playing a drum, you can create drum music
3 Changing the air perssure, what we hear as sound arc
4 Using a microphone, these are converted to electrical signals
5 Sampling the electtrical signals, the information contained in the drum machine memory consists
6 A drum machine contains recording of sound taken at measured intervals
7 This process is called sampling
8 The functions of a drum machine include panning and tuning
9 Panning means the positioning of the drum sound in stereo
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Task 6:
1 A burglar alarm = an alarm which warns of burglar
2 A clock timer = a clock which countdown time
3 A mercury swich = a swich which contains mercury
4 A car phone = a phone for use in a car
5 A germanium diode = a diode which contains germanium
6 A ground wave = a wave which travels along the ground, following the curvature
of the earth’s surface
7 A block diagram = a diagram which contains block
8 An assembly line = a line which assemblies complex item
9 A fuseholder = a device for protecting fuse
Trang 310 A wavemeter = an instrument for measuring wavelength
11 A cellphone = a device which receives and transfer signal
12 Headphone = a pair of small loudspeakers that are designed to be held in place close to a user's ears
13 An ammeter = an instrument for measuring ampere
14 A handset = a device that a user holds to the hands
Task 7:
1 A sine wave an example of an analogue wave
2 The magnitude of a digital signal has only two levels, high and low, which can be represented by the binary digits 1 and 0 respectively
3 ADC is analogue-to-digital converter, the analogue signal can be changed into digital signals
4 The higher the frequency of the analoguesignal, the more often it must be sampled
5 A four-bit ADC has sixteen different binary values , the smallest value is 0000 and the largest is 1111
An Eight-bit ADC has 256 different digital values
6 It will cause the analogue signal to suffer some distortion
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