Podcast
Questions and Answers
Which of the following is an example of airborne sound?
Which of the following is an example of airborne sound?
Impact sound can include noises created by footsteps or dropping objects.
Impact sound can include noises created by footsteps or dropping objects.
True
What is flanking transmission in acoustics?
What is flanking transmission in acoustics?
Flanking transmission is the indirect transmission of sound from one space to another through adjoining parts of the structure.
Noise is considered to be unwanted _____ that has a clearly negative connotation.
Noise is considered to be unwanted _____ that has a clearly negative connotation.
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Match the following sound types with their definitions:
Match the following sound types with their definitions:
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What term is often used to refer to an unwanted sound?
What term is often used to refer to an unwanted sound?
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Sound is a movement of energy that cannot be transmitted through gas.
Sound is a movement of energy that cannot be transmitted through gas.
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What can elevated sound levels cause in people?
What can elevated sound levels cause in people?
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The scientific study of the propagation, absorption, and reflection of sound waves is known as ______.
The scientific study of the propagation, absorption, and reflection of sound waves is known as ______.
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Match the following effects of noise with their outcomes:
Match the following effects of noise with their outcomes:
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Which of the following is a common effect of noise on quality of life?
Which of the following is a common effect of noise on quality of life?
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Noise issues are typically given high priority in urban environment policies.
Noise issues are typically given high priority in urban environment policies.
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What type of behaviors can elevated sound levels stimulate?
What type of behaviors can elevated sound levels stimulate?
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What makes it difficult to take coherent action against noise pollution?
What makes it difficult to take coherent action against noise pollution?
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Permanent sources of noise have a more significant impact than temporary noise sources.
Permanent sources of noise have a more significant impact than temporary noise sources.
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What is the frequency range of human hearing?
What is the frequency range of human hearing?
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Sources of sound from outside buildings, such as traffic and weather, are known as __________.
Sources of sound from outside buildings, such as traffic and weather, are known as __________.
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Which aspect of sound environment study focuses on reducing noise levels in and around buildings?
Which aspect of sound environment study focuses on reducing noise levels in and around buildings?
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Match the following sound sources with their type:
Match the following sound sources with their type:
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Dogs can perceive sounds at frequencies lower than 20 kHz.
Dogs can perceive sounds at frequencies lower than 20 kHz.
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What challenges does urbanization pose in relation to noise pollution?
What challenges does urbanization pose in relation to noise pollution?
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Study Notes
Course Information
- Course Title: Understanding Sound Environment
- Course Code: AED122
- Instructor: Dilshan R. Ossen, Ph.D.
- Associate Professor
Lesson Scope
- Sound and Noise in Built Environments
- Principles of Sound
- Measurement of Sound
- Material Properties
Sound & Noise in Built Environment
- Sound environment is a crucial physical element in buildings.
- People are exposed to sound daily and use sound to communicate.
- Interpretation of sound is subjective (likes and dislikes vary).
Sound and Noise Definitions
- Sound: Movement of energy caused by vibrations (solid, liquid, gas) detectable by ears.
- Noise: Unwanted sound. In science/engineering, noise is an undesirable signal that obscures a desired signal.
- Acoustics: The scientific study of sound wave propagation, absorption, and reflection.
Noise Pollution
- Source: YouTube video "Noise Pollution Is Much Worse For You Than You Think" (https://youtu.be/5jfmzufa8qo)
Effects of Unwanted Sound
- Hearing impairment
- Hypertension
- Ischemic heart disease
- Annoyance
- Sleep disturbances
- Reduced performance
- Stress
- Increased workplace accidents
- Aggression and anti-social behaviours
- Reduced quality of life (unpleasant, undesirable environments).
Noise Pollution Effects (continued)
- Permanent hearing loss
- High blood pressure
- Insomnia
- Labored breathing
- Stress
- Altered brain chemistry
- Increase in crime
- Permanent damage to the voice
Other Effects of Noise
- Interference: Disruption of significant sounds like speech or music, often causing annoyance and danger.
- Distraction: Disruption of tasks, leading to inefficiency
- Economic impact: Costs of controlling excessive noise.
Low Policy Priority For Noise
- Limited knowledge about noise exposure.
- Limited measurement of noise compared to other pollution.
- Many noise sources, making coherent action difficult.
- Lack of training.
- Absence of major noise-related accidents
- Temporary nature of noise.
Future Challenges
- Increasing urbanization, tech advancements, and population growth will intensify noise sources.
- Noise sources will expand to more diverse areas (urban, rural, leisure).
- Noise will be present more consistently throughout the day and weekend.
- Public demand for quieter environments will rise.
Good Sound Environment
- Protect from unwanted sound (noise).
- Create suitable sonic conditions for occupants.
Perception of Sound
- Hearing is crucial for survival in animals.
- Humans have limited hearing frequencies (20 Hz to 20,000 Hz).
- Other species hear a wider range of frequencies.
- Sound is a primary sense for detection of danger, navigation, predation, and communication.
Sound Levels (Decibels)
- Graduated scale of sound levels (decibels).
- Examples given of sound levels and corresponding sources (fireworks, jackhammers, traffic, etc).
- Thresholds range from quietest (breathing) to loudest (e.g., fireworks).
Sound Sources in Built Environments
- Classified as external or internal
- External: Traffic, commercial centers, aircraft, railroads, weather, playgrounds, workshops.
- Internal: Occupants, building services, HVAC, machinery.
Sound Transmission Types
- Airborne sound: Sound from vibrating objects (speech, TVs).
- Impact sound: Sound from physical impact (footfalls, hammering).
- Flanking transmission: Sound transmission through surrounding structural elements/walls.
Sound Environment Study Approach
- "Noise control": Reduce noise levels in/around buildings.
- “Room acoustics”: Create suitable sound conditions in enclosed spaces (music halls, auditoriums).
Fundamental Acoustics Concepts
- Cause: The origin of sound
- Sound generation mechanism (transduction): Process converting energy into audio
- Acoustic wave propagation: How sound waves move
- Reception/transduction: Translating sound waves into another form (e.g., neural impulse)
- Effect: Response/impact of the sound
Interaction of Sound with a Medium
- Sound interacts with a medium by reflection, absorption, and transmission.
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Description
This quiz explores the key concepts of sound and noise in built environments as covered in the course AED122. It assesses your understanding of sound principles, measurement techniques, and the impact of noise pollution on daily life. Test your knowledge and discover how acoustic properties influence our interactions with our surroundings.
