Lesson 7: Reverberation and Echo (201912A)
Lesson 7 Reverberation & Echo Did you ever wonder why sound in big halls decays longer than that in bedrooms? This phenomenon has something to do with the ability of sound to be reflected or diffused. In this lesson, we will discuss with you why and how the sound can have such a long decay. […]
Lesson 6: Behaviors of Sound in Rooms (201912A)
Lesson 6 Behaviors of Sound in Rooms To create high sound quality for music venues or speech listening rooms, we need to learn the science behind sound behaviors. Some behaviors can improve or degrade sound quality inside a room. It depends on how you control those behaviors so that the sound waves can act the […]
Lesson 5: Noise Control Performance Indices & Ratings (201912A)
Lesson 5 Noise Control Performance Indices & Ratings In building acoustics, there are numerous noise control strategies to reduce the background noise level to the targeted noise criteria (NC) or dBA–the unit for the overall A-weighted equivalent sound pressure level. Since noise control measures vary in multiple aspects, one lesson is clearly not enough to […]
Lesson 4: Structure-bone Noise & Airborne Noise (201912A)
Lesson 4 Structure-bone Noise & Airborne Noise Inside a building, we may hear many kinds of sound, including noise. Not only pleasant sounds, such as birds chirping, that we encounter, but also some disturbing sounds, such as traffic, footsteps, human conversation, and loud music from another room. All these sounds enter the room from many […]
Lesson 3: Noise Criteria: A Background Noise Rating Standard (201912A)
Lesson 3 Noise Criteria: A Background Noise Rating Standard In the previous lesson, we have learned that we can measure the sound pressure level (SPL) of background noise in dB. You also remember that the SPL value can vary in frequencies. From here, you may wonder why we don’t use a single number rating that […]
Lesson 2: Sound pressure level (SPL): Our way to quantify strength of noise (201912A)
Lesson 2 Sound Pressure Level (SPL): Our Way to Quantify The Strength of Noise After we have comprehended what background noise is, let’s talk about how we quantify it. It’s fairly commonplace for us to describe the loudness of sound, including noise, with qualitative terms, such as loud or quiet. But, can you imagine how […]
Lesson 1: Background Noise: Why Is It A Serious Problem? (201912A)
Lesson 1 Background Noise: Why Is It A Serious Problem? If you ask some acoustic consultants what common problem they often deal with, we are pretty sure that one of the answers is noise. If you are a city-dweller, you can find noise almost everywhere. You may hear the sound of annoying car horns from […]