INTRODUCTION

• TO

SOUND ACOUSTICS:-

Acoustic is important for creating musical

Instruments or concert halls or surround Sound stereo or hearing aids.

• Decibel : the decibel is commonly used in

acoustics to quantify sound levels relative to a 0 db reference.

• Measuring sound: Sound travels in waves. In solid building materials, it progresses has vibration

• Hertz : Sound frequency is measured in hertz, cycles per second.

• Noise reduction coefficient: NRC is most commonly used to rate general acoustical properties of acoustic ceiling tiles, baffles, banners, office screens and acoustic wall panels.

Noise criteria: NC is used to define design goals for the maximum allowable background noise in a given space.

• Absorption coefficient: The sound absorption coefficient describes the ability of a material to scatter or diffuse sound expressed as a fraction of incident sound.