AUDIO FREQUENCY RANGE OF HUMANS

HUMAN SPEECH IS MAINLY IN THE RANGE

PROLONGATION OF THE SOUND IN THE ROOM CAUSED BY CONTINUED MULTIPLE REFLECTIONS

SOUND PRESSURE CONVERTED TO THE DECIBEL SCALE

USED TO ABSORB THE VIBRATION OF THE GENERATOR BASE

BENDING OR “FLOWING” OF A SOUND WAVE AROUND AN OBJECT OR THROUGH AN OPENING

THE FRACTION OF THE RANDOMLY INCIDENT SOUND POWER WHICH IS ABSORBED, OR OTHERWISE NOT REFLECTED.

MEANING OF SAC

CEILING THAT CAN DIFFUSE SOUND

SCATTERING OR RANDOM REDISTRIBUTION OF A SOUND WAVE FROM A SURFACE

ABSORBS SOUND AND KEEPS IT TOO (THERMAL STORAGE)

ABSORBS SOUND AND TRANSMITS EXCESS SOUND TO THE NEXT ROOM

A SINGLE-NUMBER INDEX FOR RATING HOW ABSORPTIVE A PARTICULAR MATERIAL IS

MEANING OF NRC

A VALUE GIVEN IN DECIBELS, WHICH IS DETERMINED BY MEASURING SOUND PRESSURE LEVELS AT A CERTAIN FREQUENCY IN THE SOURCE AND RECEIVING ROOMS

MEANING OF TL

SOUND REFLECTED ON TWO-FOCUS POINTS

SOUND REFLECTED ON ONE FOCUS POINTS

A REFLECTION WITH MAGNITUDE AND DELAY

CAUSED BY REPETITIVE REFLECTIONS OFF HARD SURFACES

THIS IS A SINGLE-NUMBER RATING OF A MATERIAL’S OR ASSEMBLY’S BARRIER EFFECT

MEANING OF STC

MATERIAL WITH THE LOWEST STC RATING

MATERIAL WITH THE HIGHEST STC RATING