Quiz 1

Question 1

sound

Answer 1

periodic pressure waves that travel through a solid, liquid, or gas(a medium). Without a medium, sound can’t propagate.

Question 2

waveform

Answer 2

A graphic representation of a sound-pressure level as it moves through a medium over time

Question 3

fundamental characteristics of a waveform

Answer 3

Amplitude
Frequency
Velocity
Wavelength
Phase
Harmonic Content
Envelope

Question 4

amplitude

Answer 4

the distance above or below the centerline of a waveform. Amplitude determines a wave’s loudness

Question 5

frequency

Answer 5

the rate at which an acoustic generator or vibrating mass repeats within a cycle

Question 6

velocity of sound through air

Answer 6

1,130 ft/sec or 767 mph

Question 7

wavelength

Answer 7

the physical distance in a medium between the beginning and end of a cycle

Question 8

phase

Answer 8

the position of a sound wave in time

Question 9

“out of phase”

Answer 9

when phase shift starts creating destructive interference between waveforms

Question 10

overtones

Answer 10

partials that are higher than the fundamental frequency

Question 12

sound

Answer 12

periodic pressure waves traveling through a solid, liquid, or gas(a medium) without a medium, sound can’t propagate

Question 13

waveform

Answer 13

the graphic representation of a sound-pressure level as it moves through a medium

Question 14

fundamental characteristics of a waveform

Answer 14

amplitude
frequency
velocity
wavelength
phase
harmonic content
envelope

Question 15

amplitude

Answer 15

the distance above or below the centerline of a waveform. it determines the loudness of a wave

Question 16

frequency

Answer 16

the rate at which an acoustic generator or vibrating mass repeats within a cycle

Question 17

velocity of sound through air

Answer 17

1,130 ft/sec or 767 mph

Question 18

wavelength

Answer 18

the physical distance in a medium between the start and end of a cycle

Question 19

phase

Answer 19

the position of a sound wave in time

Question 20

phase shifts

Answer 20

forward or backward changes in the start point of a waveform

Question 21

“out of phase”

Answer 21

when phase shifts cause destructive interference between two waveforms

Question 22

overtones

Answer 22

partials higher than the fundamental frequency

Question 23

timbre

Answer 23

an instrument’s harmonics and their relative strengths which determine its characteristic sound

Question 24

parts of an envelope

Answer 24

attack
decay
sustain
release

Question 25

decibel(dB)

Answer 25

unit for sound pressure level(SPL), signal, level, and relative changes in signal level

Question 26

sound-pressure level

Answer 26

built up acoustic pressure within a defined atmospheric area. higher SPL=louder

Question 27

transducer

Answer 27

device that converts one form of energy into another

Question 28

parts of the ear

Answer 28

pinna outer ear ear drum cochlea

Question 29

psychoacoustics

Answer 29

study of sound perception and audiology

Question 30

human range of hearing

Answer 30

20-20,000 Hz

Question 31

Fletcher-Munson equal-loudness contour curves chart

Answer 31

indicates the ear's average sensitivity to different frequencies at various levels

Question 32

binaural localization

Answer 32

the capability of two ears to localize a sound source within an acoustic space

Question 33

types of reflections in an enclosed space

Answer 33

direct sound early reflections reverberation

Question 34

basic requirements for designing an acoustic space

Answer 34

acoustic isolation frequency balance acoustic separation reverberation cost

Question 35

common studio types

Answer 35

professional audio-for-visual project portable

Question 36

reverberation

Answer 36

persistence of a signal after the original sound has stopped

Question 37

first audio recording devices

Answer 37

phonautograph phonograph gramophone

Question 38

who invented the carbon microphone?

Answer 38

David Edward Hughes

Question 39

who invented the gramophone?

Answer 39

Thomas Edison and Emile Berliner

Question 40

what was the first microphone that was considered useful for recording purposes?

Answer 40

Bell Labs 394 condenser microphone

Question 41

who invented the first phonograph recording system using microphones with vacuum tube amplifiers?

Answer 41

Edward C. Wente

Question 42

who developed binaural(stereo) sound?

Answer 42

Alan Blumlein

Question 43

who developed multi-track recording?

Answer 43

Les Paul

Question 44

who invented the first crude magnetic recorder?

Answer 44

Valdemar Poulsen