Acoustics

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SCIENCE OF SOUND

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ACOUSTICS

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OSCILLATION IN PRESSURE OF THE ATMOSPHERE

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SOUND

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OVERALL ENVIRONMENT THAT AFFECTS THE ACOUSTIC CONDITION

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ACOUSTICAL ENVIRONMENT

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THE USE OF ACOUSTICAL ABSORBING OR REFLECTING MATERIALS

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ACOUSTICAL TREATMENT

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DETAILED STUDY OF ALL PERTINENT SOUND SOURCES, SOUND TRANSMISSION PATHS AND SOUND RECEPTORS

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ACOUSTICAL ANALYSIS

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RESISTANCE TO FLOW OF THE ACOUSTICAL ENERGY; MEASURED IN RAYLS

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ACOUSTICAL IMPEDANCE

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THE SCIENCE AND TECHNOLOGY OF CONTROLLING SOUND IN AND AROUND BUILDINGS

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ARCHITECTURAL ACOUSTICS

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ABILITY OF A MATERIAL TO ABSORB ACOUSTICAL ENERGY; MEASURED IN SABINS

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ABSORPTION/ SOUND ABSORPTION

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FRACTION OF SOUND ENERGY IMPINGING ON A SURFACE THAT IS ABSORBED BY THE SURFACE; DENOTED BY ALPHA

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ABSORPTION COEFFICIENT

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MATERIALS THAT DISSIPATE ACOUSTIC ENERGY

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ABSORBING MATERIALS

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SOUND THAT IS TRANSMITTED THROUGH THE AIR BY A SERIES OF OSCILLATING PRESSURE FLUCTUATIONS

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AIRBORNE SOUND

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EXISTING SURROUNDING CONDITIONS

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AMBIANT

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INCREASE IN INTENSITY LEVEL

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AMPLIFICATIONS

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LESSENING OR REDUCTION OF SOUND INTENSITY

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ATTENUATION/ SOUND ATTENUATION

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NOISE FROM ALL SOURCES IN THE ENVIRONMENT

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BACKGROUND SOUND

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SOUND SENSATION CHARACTERIZED BY MORE THAN ONE FREQUENCY

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COMPLEX TONE

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CONCENTRATION OF THE CONDUCTOR MOLECULES TO PRODUCE A HIGH PITCH LAYER OF SOUND

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COMPRESSION

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MATERIAL THAT CARRIES OR TRANSMITS ENERGY FROM ONE LOCATION TO ANOTHER

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CONDUCTOR/ SOUND CONDUCTOR

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TRANSMISSION OF SOUND ALONG CURVE SURFACES

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CREEP

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ONE COMPLETE DISPLACEMENT

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CYCLE

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CYCLES PER SECOND; UNIT OF FREQUENCY

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HERTZ

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ENERGY DISSIPATION IN AN OSCILLATING SYSTEM

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DAMPING

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RATE AT WHICH SOUND PRESSURE LEVEL IS DECREASED DUE TO THE ELIMINATION OF THE SOURCE

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DECAY RATE

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BASIC METRIC UNIT FOR DESCRIBING THE MAGNITUDE OF SOUND

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DECIBEL

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SKIN OF A PARTITION OR CEILING WHICH SEPARATES THE ROOM FROM THE STRUCTURAL SPACE IN THE CENTER

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DIAPHRAGM

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SOUND FIELD IN WHICH THE SOUND INTENSITY IS INDEPENDENT OF ITS DIRECTION

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DIFFUSE SOUND FIELD

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SOUND FIELD IN WHICH THE ENERGY ARRIVES AT THE RECEIVER IN A DIRECT PATH FROM THE SOURCE

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DIRECT SOUND FIELD

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CHANGE IN THE TRANSMITTED SOUND SIGNAL

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DISTORTION

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REFLECTED BACK SOUND WAVES

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ECHO

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CONCENTRATION OF SOUND ENERGY IN A LIMITED LOCATION

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FOCUSING

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FIELD FREE FROM BOUNDARIES

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FREE FIELD

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NUMBER OF COMPLETE OSCILLATION CYCLES OVER A PERIOD OF TIME

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FREQUENCY

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LOWEST FREQUENCY PRESENT IN A COMPLEX TONE

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FUNDAMENTAL FREQUENCY

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RAPID SUCCESSION OF ECHOES

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FLUTTER ECHO

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BEHAVIOR OF SOUND WAVES LIKENED TO THAT OF LIGHT RAYS

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GEOMETRIC ACOUSTICS

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COMPONENT OF SOUND CONTAINING MORE THAN ONE FREQUENCY

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HARMONICS

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SUBJECTIVE RESPONSE TO SOUND

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HEARING

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NOISE OF THE FREQUENCY LESS THAN 20 CYCLES PER SECOND

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INFRASOUND

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AVERAGE RATE OF SOUND ENERGY FLOW PER UNIT AREA

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INTENSITY

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TEN TIMES THE LOGARITHM OF THE RATIO OF SOUND INTENSITY TO A REFERENCE SOUND INTENSITY

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INTENSITY LEVEL

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STATES THAT SOUND INTENSITY VARIES INVERSELY WITH THE SQUARE OF THE DISTANCE FROM THE SOURCE

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INVERSE SQUARE LAW

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SOUND CAUSED BY PULSATIONS OF LIQUID PRESSURE

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LIQUIDBORNE SOUND

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SUBJECTIVE ATTRIBUTE OF AN AUDITORY SENSATION

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LOUDNESS

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OBSCURING OR COVERING UP OF ONE SOUND BY ANOTHER

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MASKING

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UNWANTED SOUND

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NOISE

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SINGLE NUMBER RATING DERIVED IN THE SAME MANNER AS STC AND NR

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NOISE ISOLATION CLASS (NIC)

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REDUCTION IN LEVEL OF UNWANTED SOUND

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NOISE REDUCTION

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FREQUENCY BAND WHOSE UPPER LIMIT IS TWICE THE LOWER LIMIT

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OCTAVE

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COMPONENT OF HIGH FREQUENCIES

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PARTIALS

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UNIT OF LOUDNESS LEVEL

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PHON

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ENABLES US TO ORDER SOUND ON A SCALE EXTENDING FROM LOW TO HIGH FREQUENCY

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PITCH

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VIBRATION PRODUCED AT A SINGLE FREQUENCY

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PURE TONE

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RESULTANT SOUND ENERGY RETURNED FROM A SURFACE

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REFLECTED SOUND

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FORCES OF OSCILLATION OF A SYSTEM OCCUR AT OR NEAR A NATURAL FREQUENCY OF A SYSTEM

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RESONANCE

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PERSISTENCE OF SOUND IN AN ENCLOSED SPACE

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REVERBERATION

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SOUND THAT IS REFLECTED FROM THE BOUNDARIES OF AND FURNISHINGS

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REVERBERATION SOUND FIELD

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TIME IN SECONDS REQUIRED FOR A SOUND TO DECAY

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REVERBERATION TIME

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MEASURE OF SOUND ABSORPTION OF A SURFACE

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SABIN

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UNIT OF HOW LOUD SOUND IS PERCEIVED

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SONE

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MATERIALS THAT HAVE THE CAPACITY TO ABSORB SOUND

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SOUND ABSORBER

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DESIGNING AND EQUIPPING A SPACE FOR EFFECTIVE RETENTION OF DESIRABLE SOUND

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SOUND CONDITIONING

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CAUSE SOUND WAVES TO BE BENT

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SOUND DIFFRACTION

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SOUND TRAVELS IN ALL DIRECTIONS

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SOUND DIFFUSION

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RATE AT WHICH ACOUSTIC ENERGY IS RADIATED

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SOUND POWER

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FLUCTUATION OF FORCE PER UNIT AREA ABOUT ATMOSPHERIC PRESSURE

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SOUND PRESSURE

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ORIGINATION OF TRANSMISSION OF SOUND ENERGY

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SOUND PROPAGATION

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REFLECTION OF SOUND ENERGY

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SOUND REFLECTION

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BENEFICIAL REINFORCEMENT OF A SOUND SIGNAL PROVIDED BY SOUND REFLECTING SURFACES

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SOUND REINFORCEMENT

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USE OF STRUCTURES AND MATERIALS DESIGNED TO REDUCE THE TRANSMISSION OF SOUND

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SOUND INSULATION/ SOUND ISOLATION

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PROPAGATION OF SOUND ENERGY

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SOUND TRANSMISSION

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SINGLE NUMBER RATING OF THE SOUND INSULATION VALUE OF A PARTITION, DOOR, WINDOW, ETC.

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SOUND TRANSMISSION CLASS (STC)

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FRACTION OF SOUND ENERGY ABSORBED

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SOUND ABSORPTION COEFFICIENT (SAC)

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DIFFERENCE IN DECIBELS OF THE SOUND PRESSURE LEVEL ON THE RECEIVER SIDE AND FROM THE SOURCE

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SOUND TRANSMISSION LOSS (STL)

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SLIGHT OFFSET IN ANGLE

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SPLAY

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SOUND TRANSMISSION THROUGH SOLID MATERIAL BY VIBRATION

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STRUCTUREBORNE SOUND

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RELATED TO THE CONDITION OF THE BRAIN AND SENSE ORGANS

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SUBJECTIVE

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MINIMUM SOUND PRESSURE LEVEL THAT IS CAPABLE OF EVOKING AUDITORY SENSATION

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THRESHOLD OF AUDIBILITY

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STIMULATES THE EAR TO POINT OF DISCOMFORT

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THRESHOLD OF PAIN

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SUBJECTIVE RESPONSE OF EAR TO THE PITCH

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TONE

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SOUND ABOVE THE AUDIBLE RANGE; FREQUENCY GREATER THAN 20000 HERTZ

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UNTRASONIC

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RATE OF TRAVEL OF SOUND

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VELOCITY OF SOUND

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SHAPE OF GRAPHIC REPRESENTATION OF SOUND WAVES

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WAVEFORM

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SPHERICAL SURFACE OF THE WAVE

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WAVEFRONT

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DISTANCE SOUND WAVES TRAVEL

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WAVELENGTH

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THREE MAIN ELEMENTS IN ACOUSTICAL SITUATION

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SOURCE, PATH, MEDIUM

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PLANNING, SHAPING, FINISHING, FURNISHING OF AN ENCLOSED SPACE TO ESTABLISH AN ACOUSTICAL ENVIRONMENT

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ACOUSTICAL DESIGN

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QUALITIES OF A ROOM

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ROOM ACOUSTICS

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TECHNOLOGY OF SOUND PRODUCTION

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ENGINEERING ACOUSTICS

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DEALS WITH ALL ASPECTS OF SOUND IN SEA

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UNDERWATER ACOUSTICS

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USED IN STUDYING ANIMAL BEHAVIOR AND IN MEDICAL DIAGNOSIS

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BIOACOUSTICS/ MEDICAL ACOUSTICS

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DEALS WITH HEARING IN HUMANS AND ANIMALS

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PHYSIOLOGICAL & PSYCHOLOGICAL ACOUSTICS

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DEALS WITH ACOUSTICS OF MUSICAL INSTRUMENTS

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MUSICAL ACOUSTICS

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PRODUCTION AND TRANSMISSION OF SPPECH

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SPEECH ACOUSTICS

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DEVICES BY WHICH ANY FORM OF ENERGY CAN BE TRANSFORMED INTO SOUND ENERGY AND VICE VERSA

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ACOUSTIC TRANSDUCERS

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TRANSFORMS ELECTRICAL ENERGY INTO MECHANICAL ENERGY SOUND

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ELECTROACOUSTICS TRANSDUCER

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WIDELY USED IN SCIENTIFIC AND INDUSTRIAL APPLICATIONS OF ACOUSTICS

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PIEZOELECTRIC AND MAGNETOSTRICTIVE TRANSDUCERS

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WAVE MOTION IN WHICH THE VIBRATION IS PARALLEL TO THE DIRECTION OF PROPAGATION

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LONGITUDINAL WAVE

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WAVE MOTION IN WHICH THE VIBRATION IS PERPENDICULAR TO THE DIRECTION OF PROPAGATION

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TRANSVERSE WAVE

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HEARING SENSITIVITY DIMINISHES IN ADVANCE IN AGE WITHOUT DISEASES

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PRESBYCUSIS

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PROLONGED AND REPEATED EXPOSURE TO DAILY INTENSE SOUND NOISE

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SOCIOCUSIS

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HEARING LOSS ATTRIBUTED TO SICKNESS

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NOSOCUSIS

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CHARACTERIZED BY HIGH- PITCHED RINGING IN THE EARS

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TINNITUS

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MATERIAL IN WHICH IT'S ABSORPTION IS NEGLIGIBLE DUE TO RIGIDNESS AND LOW POROSITY.IT IS A GOOD ALL-FREQUENCY SOUND REFLECTOR

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BRICK

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MATERIAL THAT PROVIDES VIRTUALLY NO ABSORPTION

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CONCRETE

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MATERIAL WHERE IT'S ATTENUATION MAY BE ADEQUATE IN NON-CRITICAL CASES

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LIGHTWEIGHT CONCRETE MASONRY UNITS

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MATERIALS THAT ATTENUATE SOUND VERY WELL

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NORMAL-WEIGHT CONCRETE MASONRY UNITS

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ALMOST TOTALLY REFLECTIVE IN THE HIGHER FREQUENCIES

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GLASS

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CELLULAR NETWORK OF INTERLOCKING PORES

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POROUS MATERIALS

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ABSORBERS HAVING AN IMPERVIOUS SURFACE MOUNTED OVER AN AIR SPACE

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PANEL

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CREATED BY HOLES CONNECTED TO AN ENCLOSED VOLUME OF TRAPPED AIR

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RESONATORS