SOUND THEORY 1

Question 1

What is sound?

Answer 1

Sound may be described as a physical or as a perceptual phenomenon.

Question 2

What are the two sound phenomenons?

Answer 2

Physical and Perceptual

Question 3

Describe physical sound phenomenon.

Answer 3

Sound may be defined as a periodic fluctuation in pressure above and below a normal stable level.

Question 4

Describe perceptual sound phenomenon.

Answer 4

sound may be defined as the perceived effect of a

periodic fluctuation in pressure within a specific range

Question 5

Sound does not _____ in _____ or through ______ at ______ degrees in temperature

Answer 5

Sound does not propagate in vacuum or through media at absolute zero degrees in temperature

Question 6

Pressure above a normal stable level is called?

Answer 6

Compression

Question 7

Pressure below a normal stable level is called?

Answer 7

Rarefaction

Question 8

What is the speed of sound?

Answer 8

The speed of sound is affected by the temperature, elasticity and the density of the
medium through which it travels

Question 9

Speed of sound is directly proportional to?

Answer 9

Temperature

Question 10

Speed of sound is greater in?

Answer 10

More elastic states

Question 11

Speed of sound is inversely proportional to?

Answer 11

Density

Question 12

What is the formula used for speed of sound?

Answer 12

c = 331 + (0.6t) in air at sea level / Speed = 331 + (0.6temperature)

Question 13

Speed is the ratio between ____ and the amount of ____ taken to cover it.

Answer 13

Speed is the ratio between distance and the amount of time taken to cover it.

Question 14

What is the ‘equating speed and the distance covered by sound’ formula?

Answer 14

c = d / t (speed = distance / time)

Question 15

What formula do you use to find the distance?

Answer 15

d = c * t (distance = speed * time)

Question 16

What formula do you use to find the time?

Answer 16

t = d / c (time = distance / speed)

Question 17

What is amplitude (A)?

Answer 17

Is the amount of deviation from normal atmospheric pressure

Question 18

What is frequency (f)?

Answer 18

Is the number of complete cycles of pressure fluctuation that occur in one second, expressed in c.p.s. or Hertz e.g. one cycle per second is referred to as one Hertz.

Question 19

What is Period (T)?

Answer 19

Is the amount of time necessary for one full cycle to take place.
T = period (s) f = frequency (Hz)

Question 20

What is the formula to find the period?

Answer 20

T = 1/f

Question 21

How do you find the frequency using the period formula?

Answer 21

f = 1/T

Question 22

What is the first way to describe a wavelength?

Answer 22

As the distance traveled by sound during one period

Question 23

What is the second way to describe a wavelength?

Answer 23

As the distance between any two consecutive, corresponding points along a waveform

Question 24

What is the formula used to find a wavelength?

Answer 24

λ = c / f

Question 25

How do you find the frequency, using the wavelength formula?

Answer 25

f = c / λ

Question 26

How do you find the speed of sound, when using the wavelength formula?

Answer 26

c = f x λ

Question 27

Phase is used to describe?

Answer 27

The different points along a waveformʼs cycle

The relationship or interaction between different sound waves or audio signals

Question 28

What is the formula used to find the phase shift?

Answer 28

Ø = ∆t x 360 x f

Question 29

Comb filtering is the effect of alternating ______/______ at different _______ when _______ time-displaced versions of a complex sound reach a common _____ in space.

Answer 29

Comb filtering is the effect of alternating reinforcements/cancellations at different frequencies when multiple time-displaced versions of a complex sound reach a common point in space.

Question 30

The sine wave components of a sound are described as ?

Answer 30

Partials

Question 31

Partials are divided into

______, _____ (integer multiples of the fundamental) and other _______

Answer 31

Partials are divided into

fundamental, harmonics (integer multiples of the fundamental) and other overtones

Question 32

The collection of all partials is called?

Answer 32

The sound spectrum.

Question 33

Sine waves consist of?

Answer 33

A single, fundamental frequency or first harmonic

Question 34

Sawtooth waves consists of?

Answer 34

all harmonics at decreasing amplitudes

Question 35

[y = sin (x) +1/2 sin (2x) + 1/3 sin (3x) + 1/4 sin (4x) + … ] This represents?

Answer 35

A sawtooth wave

Question 36

Square waves consist of?

Answer 36

odd harmonics at decreasing amplitudes. A square wave is one type of pulse wave

Question 37

[y = sin (x) +1/3 sin (3x) + 1/5 sin (5x) + 1/7 sin (7x) + …] This represents?

Answer 37

A square wave

Question 38

Triangle waves consist of?

Answer 38

odd harmonics alternating in polarity and with steeper decreasing amplitudes (in relation to square waves)

Question 39

[y = sin (x) - 1/9 sin (3x) + 1/25 sin (5x) - 1/49 sin (7x) + …] This represents?

Answer 39

A triangle wave