Mid Term

Front 1

Compression

Back 1

Reducing a signal's output level in relation to its input level to reduce dynamic range. The Drawing together of vibrating molecules, producing a high pressure are.

Front 2

Rarafaction

Back 2

Temporary drawing apart of drawing apart of vibrating molecules, causing a partial vacuum to occur

Front 3

Frequency

Back 3

The number of times per second that a sound source vibrates expressed in hertz; formerly expressed in cycles per second.

Front 4

Octave

Back 4

The interval between two sounds that have a frequency ration 2:1

Front 5

Range of Human Hearing

Back 5

35 Hertz to 16 kilo hertz

Front 6

Presence Range

Back 6

Perception of a sound as being close and realistic

Front 7

Amplitude

Back 7

The Magnitude of a sound wave or an electric signal measured in decibels.

Front 8

Threshold of Pain

Back 8

The sound-pressure level at which the ear begins to feel pain, about 140 db-spl, although levels of around 120 db-spl cause discomfort.

Front 9

Doubling of Sound

Back 9

Mixing slightly delayed signal with the original signal to create a fuller stronger more ambient sound.

Front 10

Outer Ear

Back 10

The portion of the ear that picks up and directs sound waves through the auditory canal to the middle ear.

Front 11

Middle Ear

Back 11

The part of the ear that transfers sound waves from the eardrum to the inner ear.

Front 12

Inner Ear

Back 12

The part of the ear that contains the auditory nerve which transmits sound waves to the brain.

Front 13

Role of middle ear

Back 13

Protect the inner ear from pressure changes that are too great.

Front 14

TTS

Back 14

Temprary threshold Shift - Auditory fatigue is a reversible desensitization in hearing caused by exposure to loud over a few hours.

Front 15

Tinnitus

Back 15

After prolonged exposure to loud sounds the ringing whistle or buzzing in the ears even though no loud sounds are present.

Front 16

Equal Loudness Principle

Back 16

The principle that confirms the human ears nonlinear sensitivity to all audible frequencies: that midrange frequencies are perceived with greatest intensity and that bass and treble frequencies are perceived with lesser intensity.

Front 17

Masking

Back 17

The hiding of some sounds by other sounds when each is a different frequency and they are presented together.

Front 18

Acoustical Phase

Back 18

The time relationship between two or more sound waves at a given point in their cycles.

Front 19

Timbre

Back 19

The unique tone quality or color of a sound

Front 20

Sound Envelope

Back 20

Changes in the loudness of a sound over time, described as occurring in four stages - initial decay, sustain and release.(adsr)

Front 21

Psychoacoustics

Back 21

The study of human perception of and subjective response to sound stimuli.

Front 22

Acoustics

Back 22

The science that deals with the behavior of sound and sound control including its generation transmission reception and effects. the properties of a room that affect the quality of sound.

Front 23

Direct Sound

Back 23

Sound waves that reach the listener before reflecting off any surface.

Front 24

Early Reflections

Back 24

Reflections of the original sound that reach the listener within about 40 to 50 ms of the direct sound.

Front 25

Reverberantion

Back 25

Multiple blended random reflections of a sound wave after the sound source has ceased vibrating

Front 26

reverberation

Back 26

Multiple Blended random reflections of a sound wave after the sound source has ceased vibrating the types of reverberation in current use are digital convolution plate and acoustic chamber.

Front 27

Echo

Back 27

Sound reflections delayed by 35 ms or more that are perceived as discrete repetitions of the direct sound.

Front 28

Flutter Echoes

Back 28

Echoes between parallel walls that occur in rapid even series

Front 29

Dry sound

Back 29

A sound devoid of reverberation or signal processing

Front 30

Sound Isolation

Back 30

Isolated to prevent outside noise from leaking into the room and keep loud sound levels generated inside the room from disturbing neighbors.

Front 31

Room Demensions

Back 31

Sometimes a studios dimensions accentuate noise by reinforcing certain frequencies thereby altering or coloring the natural sounds.

Front 32

Room Shape

Back 32

Acoustics is a science of interacting relationship.

Front 33

Room Acoustics

Back 33

strategically placed absorbers, diffusers and bass traps can control unwanted room reflections.

Front 34

Resonator

Back 34

designed to absorb sounds

Front 35

Resonance

Back 35

Transmitting a vibration from one body yo another when the frequency of the first body is exactly, almost exactly the natural frequency of the second body.

Front 36

Diffusion

Back 36

The scattering of sound waves to a uniform intensity.

Front 37

Ergonomics

Back 37

Designing an engineering system with human comfort and convenience in mind.

Front 38

Transducer

Back 38

a device that converts one from of energy into another - Loudspeaker is a transducer

Front 39

Moving - coil Microphone

Back 39

A mic with moving coil element the coil is connected to a diaphragm suspended in a magnetic field.

Front 40

Passive loudsoeaker

Back 40

A loudspeaker that is powered externally.

Front 41

Active Loudspeaker

Back 41

a loudspeaker that is powered internally

Front 42

Crossover network

Back 42

an electronic device that divides the audio spectrum into individual frequency ranges (low,high,middle) before sending them to specialized loudspeaker such as the woofers and tweeters.

Front 43

Woofer

Back 43

Informal name for a loudspeaker that produces the bass frequencies

Front 44

Tweeters

Back 44

the informaal name of a loudspeaker that reproduces high frequencies

Front 45

Three way system loudspeaker

Back 45

a loudspeaker with two crossover network

Front 46

two-way system loudspeaker

Back 46

loudspeaker system with one crossover network

Front 47

Polar response Pattern

Back 47

The graph of a microphones directional characteristics as seen from above. the graph indicates response over a 360 degree circumference in a series of concentric circles move inward toward the center.

Front 48

Near field monitoring

Back 48

reduces the audibility of control room acoustics by placing loudspeakers close to the listening position.

Front 49

Real Time Analyzer

Back 49

(RTA) a device that shows the total energy present all audible frequencies on an instantaneous basis.

Front 50

Noise canceling headphones

Back 50

Work on powerful low and midrange frequencies.

Front 51

Impedance

Back 51

the measure of total resistance to the current flow in an ac circuit expressed in ohms.

Front 52

Dynamic Mic

Back 52

A mic that transduces energy electromagnetically moving coil ribbon microphone are dynamic.

Front 53

ribbon mic

Back 53

a mic with a ribbon diaphragm suspended in a magnetic field.

Front 54

Phantom Power

Back 54

operating voltage supplied to a capacitor microphone by an external power source or mixer thereby eliminating the need for batteries.

Front 55

Capacitor/condenser mic

Back 55

is a mic that transduces acoustic energy into energy electrostatically

Front 56

Transient

Back 56

is a high amplitude short duration at the beginning of a waveform that occurs in phenomena such as musical sounds noises or speech.

Front 57

system mic

Back 57

Interchangeable mic capsules of various directional patterns that attach to a common base. base contains a power supply and a pre-amplifier.

Front 58

Shotgun Mic

Back 58

A highly directional mic with a tube that resembles the barrel of a rifle.

Front 59

Parabolic Mic

Back 59

system that uses a concave dish to focus reflected sound into a mic pointed at the center of the dish.

Front 60

Contact Mic

Back 60

mic that attaches to a sound source and transduces the vibrations that pass through it.

Front 61

PZM

Back 61

Pressure zone MIc

Front 62

Wireless Mic System

Back 62

System consisting of a transmitter that sends a mic signal to a receiver connected to a connected to a console or recorder.

Front 63

Diversity Reception

Back 63

dual antenna or receiver system for use with wireless mic to avoid degradation or dropout in transmission.

Front 64

Sensitivity

Back 64

measure of the voltage a microphone produces which indicated its efficiency.

Front 65

S/N Ratio

Back 65

Signal to Noise Ratio - the ratio expressed in decibels of an electronic devices nominal output to its noise floor. the wider the s/n ratio the better.

Front 66

Proximity Effect

Back 66

increase in the bass response of some mics as the distance between the mic and its source is decreased.

Front 67

Bass Roll Off

Back 67

Attenuating bass frequencies the control for example on a mic used to roll off bass frequencies.

Front 68

Humbuck Coil

Back 68

Circuit built into a mic to reduce hum pickup

Front 69

Windscreen

Back 69

foam rubber covering specially designed to fit over the outside of a mic head. reduce plosive and blowing sounds.

Front 70

Shock Mount

Back 70

a device that isolates a mic from mechanical vibrations it can be attached externally or built into a mic.

Front 71

XLR connector

Back 71

common male and female mic plugs with a three pin connector.

Front 72

Fishpole boom

Back 72

handheld microphone boom used in small studio spaces it is the mic mount of choice in field production it can be moved around a set with relative ease.