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CDIS 3469 Hearing Science > Lecture (2/8) Thursday Week 4 Thursday > Flashcards

Lecture (2/8) Thursday Week 4 Thursday Flashcards

1
Q

Complex wave definition

A

any sound that is composed of 2 or more sine waves

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2
Q

How do you find the points on a complex wave?

A

sum the instantaneous amplitudes of two or more sine waves at each point on the waveform

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3
Q

What is a periodic complex wave?

A

Complex wave that repeats itself over time
(periodic= repetitive)

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4
Q

Periodic complex waves are made up of…

A

frequencies that are harmonically related-not random

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5
Q

Describe the harmonic relations of periodic complex waves

A

each sinusoid must be an integer multiple of the lowest in the series.

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6
Q

The highest common denominator of a periodic complex wave sinusoid is called the

A

fundamental

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7
Q

Each of the integer multiples of a periodic complex wave is called a

A

harmonic

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8
Q

in a periodic complex wave, if f0 is 100, what are the other harmonic components?

A

f0 100
f2 200
f3 300
f4 400
f5 500

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9
Q

If the T is 8ms, what is the frequency?

A

8ms= .008s
1/.008s=125Hz

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10
Q

If 125Hz is F0 what are the next harmonics?

A

2f 250Hz
3f 375Hz
4f 500Hz
5f 625Hz

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11
Q

T/F even if F0 is not physically in a complex wave, your brain fills it in.

A

True

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12
Q

What would be the F0 if
3f 600Hz
4f 800Hz
5f 1000Hz
6f 1200Hz

A

200 Hz

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13
Q

Your brain finds the ____ of all the harmonics it hears

A

greatest common denominator

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14
Q

The pitch of the note is also the

A

f0

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15
Q

The octave is…

A

a doubling of frequency

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16
Q

What is the frequency ratio of an octave?

A

2:1 or 2:1
example: 200:100 or 500:250

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17
Q

What is consonance?

A

adding frequencies that are harmonically related

18
Q

What is dissonance?

A

adding frequencies that are not harmonically related

19
Q

What happens when you combine frequencies that are close

A

it creates complex waves that wax and wane in amplitude (beats)

20
Q

Changes in amplitude cause ______

A

beats

21
Q

The number of beats per second is equal to the _____

A

difference in Hz between the two tones

22
Q

What is the definition of a Fourier Analysis?

A

Mathematical process by which a complex sound is broken down into its individual sine waves
(frequency on the x axis and power on the y axis)

23
Q

What does an aperiodic complex wave represent?

A

combinations of sounds that are not harmonically related

24
Q

characteristics of continuous aperiodic waves

A

-on going in time
-noise

25
Q

characteristics of transients aperiodic waves

A

-short duration; brief acoustic event
-click

26
Q

the ______ the click, the _______ the spectrum

A

shorter the click, broader the spectrum

27
Q

What has more frequencies?
P= 1ms or
P=.03ms

A

P=.03ms
-because it is a shorter period, so it has more frequencies within in

28
Q

What is the psychological definition of noise?

A

unwanted sounds

29
Q

Which noise has all frequencies of equal amplitude?

A

white noise

30
Q

Describe gaussian noise

A

-a type white noise with random amplitudes
-amplitudes vary according to a bell curve

31
Q

What frequency emphasis is Sawtooth noise?

A

high frequency emphasis

32
Q

What frequency emphasis is Pink noise?

A

low frequency emphasis

33
Q

What is the definition of frequency distortion?

A

frequencies or amplitudes in the output that were not in the input

34
Q

What will introduce distortion?

A

a transfer function of energy from one form to another

35
Q

energy transfer is _____

A

nonlinear (causes distortion)

36
Q

The ear is _____

A

nonlinaer

37
Q

In distortion, _______ are the frequencies that are added

A

harmonics

38
Q

Otoacoustic emissions

A

used to test newborn hearing

39
Q

Tones that are the result of summanation

A

f1 + f2 ; 2F1+f2

40
Q

Tones that are the result of difference

A

f1-f2 2f1- 2f2

41
Q

Distortion is measured in

A

Percentage

CDIS 3469 Hearing Science (11 decks)

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