Sound Element Les 4

Question 1

is a physical phenomenon produced by the vibration of matter and transmitted as waves

Answer 1

Sound

Question 2

Sound is a physical phenomenon produced by the ___ of matter and transmitted as waves

Answer 2

Vibration

Question 3

The ___ which emits sound

Answer 3

Source

Question 4

The ___ through which the sound propagates

Answer 4

medium

Question 5

The ___ which receives and interprets the sound

Answer 5

Detector

Question 6

The simplest sound we can hear is a ____

Answer 6

sine wave

Question 7

attributes of sound waves

Answer 7

Period
Frequency
Amplitude
Bandwidth
Pitch
Loudness
Dynamic

Question 8

Is the interval at which a periodic signal repeats regularly

Answer 8

Period

Question 9

A perception of sound by human beings, it measures how ‘high’ is the sound as it perceived by a listener

Answer 9

Pitch

Question 10

measures a physical
property of a wave. It is the reciprocal
value of period f = 1/ P. The unit is Hertz
(Hz) or kiloHertz (kHz).

Answer 10

Frequency

Question 11

What is the human hearing range

Answer 11

20-20 kHz

Question 12

is the measure of sound levels. For a digital sound, ____ is the sample value.

Answer 12

Amplitude

Question 13

The ___ of sound is the amount of power transmitted through an area of 1m^2 oriented perpendicular to the propagation direction of the sound.

Answer 13

Intensity

Question 14

The unit of power is

Answer 14

watt

Question 15

The relative intensity of two different sounds is measured
using the unit Bel or more commonly ____

Answer 15

deciBel (dB)

Question 16

range means the change in sound
levels

Answer 16

Dynamic

Question 17

is the range of frequencies a
device can produce, or a human can hear.

Answer 17

bandwidth

Question 18

are continuous while computers are good at handling discrete numbers

Answer 18

Sound Waves

Question 19

Each sample is represented by a number, the ____

Answer 19

code

Question 20

This process is known as ___

Answer 20

digitization

Question 21

This method of digitizing sound is known as ____

Answer 21

pulse code modulation (PCM).

Question 21

According to ____, in order to capture all audible frequency
components of a sound, i.e., up to 20kHz, we need to set the sampling to at least twice
of this.

Answer 21

Nyquist sampling theorem

Question 22

This is why one of the most popular sampling rate for high quality sound is ____

Answer 22

4410Hz.

Question 23

The most commonly use digital sound format in
Windows systems is ____ files.

Answer 23

.wav

Question 24

Sound is stored in .wav as digital samples known as ____

Answer 24

Pulse Code Modulation (PCM).

Question 25

___- use Adaptive Delta Pulse Code Modulation (ADPCM)

Answer 25

.vox

Question 26

___file is a proprietary format

Answer 26

RealAudio

Question 27

An ___ (ADC) converts the analog sound signal into digital samples.

Answer 27

analog-to-digital converter

Question 28

A ___ (DSP) processes the sample, e.g. filtering, modulation, compression, and so on

Answer 28

digital signal processor

Question 29

A ___processes the sample, e.g. decompression, demodulation, and so o

Answer 29

digital signal processor (DSP)

Question 30

___ controls the hardware device

Answer 30

Windows device driver —

Question 31

___ the user’s interface to the hardware for configuring the devices

Answer 31

Device manager

Question 32

There is a better way to generate high quality music. This is known as____

Answer 32

MIDI — Musical Instrument Digital Interface

Question 33

What is the meaning of MIDI

Answer 33

MIDI — Musical Instrument Digital Interface

Question 34

___ for receiving MIDI data

Answer 34

IN

Question 35

___ for outputting MIDI data that are generated by the instrument

Answer 35

OUT

Question 36

___ for passing MIDI data to the next instrument.

Answer 36

THRU

Question 37

__ contains information about the entire file: the type of MIDI file, number of tracks and the timing.

Answer 37

Header chunk

Question 38

___ the actual data of MIDI track.

Answer 38

Track chunk

Question 39

Three types of MIDI file

Answer 39

0 single multichannel track 1 one or more simultaneous track of a sequence 2 one or more sequentially independent single-track patterns

Question 40

Gradually Die out

Answer 40

DIminishing sound

Question 41

Sustain unil turned off

Answer 41

Continuing Sound

Question 42

The amplitude envelop

Answer 42

Delay Attack Hold Decay Sustain Release

Question 43

___ the time between when a key is played and when the attack phase begin

Answer 43

Delay

Question 44

___ the time from no sound to maximum amplitude

Answer 44

Attack

Question 45

___ the time envelop will stay at the peak level before starting the decay phase

Answer 45

Hold

Question 46

___ the time it takes the envelop to go from the peak level to the sustain level

Answer 46

Decay

Question 47

___ the level at which the envelop remains as long as a key is held down

Answer 47

Sustain

Question 48

__ the time is takes for the sound to fade to nothing

Answer 48

Release

Question 49

* Digital representation of physical sound waves * File size is large if without compression * Quality is in proportion to file size * More software available * Play back quality less dependent on the sound sources * Can record and play back any sound including speech

Answer 49

Digital Audio

Question 50

* Abstract representation of musical sounds and sound effects * MIDI files are much more compact * File size is independent to the quality * Much better sound if the sound source is of high quality * Need some music theory * Cannot generate speech

Answer 50

MIDI