Acuostic 2017 Flashcards
Describe what the cafe effect is?
- How acoustics effects a cafe sound behaves in a café or similar space.
- Cafes have multiple hard surfaces like walls and floors.
- Surfaces and objects cause sound to bounce around and mix together, creating a lively and vibrant atmosphere.
- Creates higher level of background noise, which will be good for having a private conservation or music.
Give an example of a type of auditorium where a
low reverberation time would be beneficial and explain why;
Speech Rooms (Page 55)
- Low reverberation room, you don’t want to speaking like you’re in a church or a concrete room
- Early reflections (Overhead, side, lateral)
- Prevents echos and focusing
When speaking and the voice bounces off the room/ reflecting of the materials,
- Low Noise
Give an example of a type of auditorium where a high reverberation time is desirable and explain why.
Concert Hall
- Involves music instruments and vocals, the longer the reverberation time in the hall, will enhance the experience.
- Sound reflects and linger
- Blend the notes together of different instruments
- sense of grandeur
Explain the term “flutter echo”
- Sound Waves bounce back and forth between two parallel reflecting surfaces
- ## Repetitive reflective paths
Provide two treatments that could be used to avoid flutter echoes
- Acoustic panels
- Diffusers (tecxtured surfaces)
Describe two factors, other than sound level, which influence a community’s response to noise.
- Frequency and pitch (Road works, alarms
- Parties, sporting events, local music performances
In the context of noise and Resource Management issues, explain what is meant by the term “Reverse Sensitivity”. Use the example of noise from aircraft in your explanation.
- People move to an area knowing about a specific noise source, such as aircraft noise near an airport
- individuals who were okay with the sound of an aircraft but develop a negative perception of it over time.
Was the music written for the space or was the space built to house the music?”. Discuss this question with two examples of different musical styles and spaces
Renaissance: Music made to suit the space
Baroque: Music made to suit the space
Name a 20th century concert hall form/shape that proved unsuccessful for symphonic music and describe why
Shoe Shape/Rectangular
- They had long reverberation time
- The parallel reflective walls, sound waves bounces off the walls can create strong and focused reflections that interfere with the direct sound from the performers.
- Uneven sound distribution throughout the hall
- Sound Delay
The Building Code Clause G6 contains minimum performance standards of STC 55 and IIC 55. What do the terms STC and IIC stand for?
What kind of sound sources are controlled by STC 55?
What kind of sound sources are controlled by IIC 55?
- STC: Sound transmission Class: of walls, floors and cielings, shall not be less than 55
- IIC: Impact Insulation Class: of floors shall not be less than 55
Sketch a masonry wall construction and a lightweight wall construction that would each meet the Building Code inter-tenancy requirements. Label key components of each wall
For a typical apartment development, give two examples of room adjacencies where the performance requirements of G6 apply and two examples where the performance requirements do not apply.
G6 Requirement (Habitable Spaces)
- bedrooms
- living rooms and lounges
- kitchens
- studies
Non G6 Requirement (Non-Habitable Space)
- bathrooms and toilets
- laundry
- walk-in wardrobe
- corridor, hallway, lobby
- clothes-drying room
- other spaces of a specialised nature
- occupied neither frequently nor for
extended periods
Explain the difference between sound insulation and sound absorption.
(i) Give 2 examples of materials that provide high levels of sound insulation;
(ii) Give 2 examples of materials that are sound absorptive.
Sound Insulation: Sound insulation focuses on preventing sound transmission between areas
Example
- Concrete
- Plasterboard
- Timber
- Glass
Sound Absorption: Deals with reducing sound reflections and reverberation within a space.
Example
- Porous materials
- Fiberglass Batts
- Polyester
- Wool
- Carpet
What sounds (or type of sounds) are more effectively controlled by a masonry wall than a lightweight wall.
Low frequency
Name one of the key acoustical objectives of La Philharmonie de Paris and describe what features of the room were used to achieve this objective.
- Seating
- Reflectors integrated to the balconies
- Stage
- Stalls
- Suspended reflectors
- Top Cap
