ECEN LONG QUIZ
ECEN Long Quiz: Mastering Sound Concepts
Are you ready to test your knowledge in the field of acoustics? The ECEN Long Quiz consists of 58 carefully crafted questions covering essential concepts such as sound wave interaction, absorption, diffusion, and acoustic properties of materials. Perfect for enthusiasts and professionals alike!
Join us to explore:
- Key principles of sound behavior
- Acoustic materials and their applications
- Factors affecting sound quality and distribution
€¢ Bouncing back of sound waves from the surface.
ABSORPTION
Reflection
DIFFUSION
DIFFRACTION
Refers to the process by which a material, structure, or object takes in sound energy when sound waves are encountered.
DIFFRACTION
ABSORPTION
DIFFUSION
Reflection
€¢ is the act of evenly distributing sound waves throughout a space.
DIFFUSION
DIFFRACTION
Reflection
ABSORPTION
€¢ involves a change in direction of waves as they pass through an opening or around a barrier in their path.
DIFFRACTION
Reflection
RESONANCE
DIFFUSION
Is a phenomenon in which sound waves have a frequency that matches one of the natural frequencies of the room.
DIFFRACTION
Reflection
RESONANCE
ABSORPTION
Acoustical materials are a variety of foams, fabrics, metals, etc. Used to quiet workplaces, homes, automobiles, and so forth to increase the comfort and safety of their inhabitants by reducing noise generated both inside and outside of those spaces.
PSYCHOACOUSTIC
ACOUSTICAL MATERIALS
ACOUSTIC
ROOM ACOUSTICS
Relates to the use of soundproofing
Blocking
Reflection
Works by converting sound energy into heat.
Isolating
Reflection
Blocking
Diffusion
Seeks to scatter sound without deadening a room.
Isolating
Diffusion
Reflection
Blocking
Is done at the source of the noise itself, by placing a compressor on isolation mounts, for instance.
Blocking
Reflection
Isolating
Diffusion
€¢ is used to evaluate the sound absorption efficiency of materials. It is the ratio of absorbed energy to incident energy and is represented by α. If the acoustic energy can be absorbed entirely, then α =
ABSORPTION COEFFICIENT
SPECIFIC ACOUSTIC IMPEDANCE
NOISE REDUCTION COEFFICIENT
SOUND TRANSMISSION CLASS
€¢ is defined as the product of a material’s density and its acoustic velocity.
ABSORPTION COEFFICIENT
SPECIFIC ACOUSTIC IMPEDANCE
SOUND TRANSMISSION CLASS
NOISE REDUCTION COEFFICIENT
€¢ is an average rating of how much sound an acoustic product can absorb.
SPECIFIC ACOUSTIC IMPEDANCE
NOISE REDUCTION COEFFICIENT
SOUND TRANSMISSION CLASS
ABSORPTION COEFFICIENT
Is a score given to a building’s surface (wall, ceiling, window, etc.) based on its ability to reduce sound coming through it.
SOUND TRANSMISSION CLASS
SPECIFIC ACOUSTIC IMPEDANCE
NOISE REDUCTION COEFFICIENT
A-WEIGHTED SOUND LEVEL SCALE
€¢ are a scale of measurement for all sound that can be heard by humans, starting with zero as the lowest threshold of human hearing and going up to 110 dBA for jet fly-over/indoor rock band
A-WEIGHTED SOUND LEVEL SCALE
SOUND TRANSMISSION CLASS
SPECIFIC ACOUSTIC IMPEDANCE
NOISE REDUCTION COEFFICIENT
Is a subfield of acoustics dealing with the behaviour of sound in enclosed or partially-enclosed spaces.
ACOUSTICAL MATERIALS
ACOUSTIC
PSYCHOACOUSTIC
ROOM ACOUSTICS
One way bad acoustics can manifest is by magnifying small sounds.
Improved Concentration
Better Overall Sound Quality
Once you’ve adjusted the acoustics of your room to allow for greater concentration, it follows that you’ll be able to work more productively.
Increased Productivity
Hard Surfaces
Sometimes, you’re focused on the sound itself in addition to its effects.
Better Overall Sound Quality
Increased Productivity
Much of what drives how a sound wave interacts with a surface is whether the surface is hard or soft
Noise Sources
Hard Surfaces
Sometimes the surfaces aren’t the only thing that could be causing problems -the sound waves themselves are just as significant.
Noise Sources
High Ceilings
Even if your sound source is facing a horizontal direction, sound waves will still go upward and come into contact with your ceiling.
High Ceilings
Hard Surfaces
-Reverberation time, or RT60, refers to the time it takes for a sound to fade away in a room — or more accurately, to decrease by 60 decibels.
Minimal Reverberation Time
Appropriate Sound Levels
When you’re judging a room’s acoustics, make sure you don’t do it all from one spot. A room may have excellent acoustics in one spot and worse acoustics in another. It all depends on how the sound is distributed.
Uniform Sound Distribution
Low Background Noise
-Improper sound distribution is frequently the problem when people are not able to hear sounds in a room. Other times, the problem is that the sound source isn’t loud enough.
Minimal Reverberation Time
Appropriate Sound Levels
The focus of acoustics is usually on the sounds you want to hear, but you can’t ignore the fact that there will be unwanted sounds as well.
Low Background Noise
Uniform Sound Distribution
Most echoes occur due to concentrated reverberation, where a single surface reflects the sound waves toward you. Flutter echoes are slightly different, as they involve sound waves bouncing back and forth between two parallel surfaces.
Minimal Echoes
Minimal Reverberation Time
Refers to the process of spreading sound waves out evenly across a space
Tuning
Diffusion
Solution for removing sound waves from an environment.
Soundproofing
Absorption
Refers to the process of altering a room’s acoustics by projecting sound waves into the air in a certain way.
Tuning
Absorption
Doesn’t involve manipulating sound waves within the room — it keeps them from getting in to start with.
Soundproofing
Sound reinforcement system
_____ is the combination of microphones, signal processors, amplifiers, and loudspeakers that makes live or pre-recorded sounds louder and delivers those sounds to a large audience.
Sound reinforcement system
Absorption
The most basic system
Input, amplification and an output
Sound reinforcement system
An integral part of a sound system
Transducer
Echo
changes one kind of energy into another.
Absorption
Transducer
Changes sound waves into audio signals
Microphone
Speaker
Changes audio signals into sound waves
Microphone
Speaker
The basic function of a sound system is ________ which can be accomplished in several different stages.
Amplification
Gain
Makes an electrical copy of an electrical signal and reproduces the copy into a stronger signal.
Speaker
Amplifier
The increase in signal strength is known as
Amplification
Gain
These manipulated functions are known as
Gain
Signal processing
Modern sound systems
Mixer
Are made up of a series of interacting components which can be interconnected on an as needed basis.
Signal processing
Mixer
Modern sound systems
Microphones
Signal flow starts with
Signal processing
Mixer
Microphones
Modern sound systems
Plays an important role in the live sound reinforcement system, it is the heart of the system.
Signal processing
Equalizers
Directional pick up pattern
Mixer
Play an important role in determining the quality of the sound that will be delivered through the speakers
Mixer
Signal processing
Microphones
Directional pick up pattern
High quality mics combined with the appropriate __________________ can provide the best possible pick up of sound sources and eliminate unwanted sounds.
Signal processing
Directional pick up pattern
Mixer
Equalizers
Provide the ability to further hone in on specific frequencies and make adjustments to increase clarity or eliminate unwanted noise and feed back.
Directional pick up pattern
Equalizers
EQs
Mixer
Come in various configurations, the more channels the more control that is available throughout the frequency spectrum.
Directional pick up pattern
Mixer
Equalizers
EQs
Boost a signal level prior to power amplification, many times this is done by the mixer.
Amplifiers
Preamplifiers
Power amplification
None of the above
provides an output signal strong enough to drive the speakers.
Amplifiers
Power amplification
Preamplifiers
None of the above
this component separates frequencies between the highs and lows of the frequency spectrum.
Passive crossovers
Crossover
Cabling
Can be active equipment as in the previous slide or passive such as you would find in full range speakers.
Cabling
Passive crossovers
Crossovers
Are small circuits connected between speakers in a speaker cabinet.
Cabling
Crossovers
Passive crossovers
None of the above
Will greatly determine the output quality of the audio signals.
Cabling
Passive crossovers
Crossovers
None of the above
Use to narrow a signal’s dynamic range by compressing sound.
Compressor
Delay echo
Downward Expander
Use in audio effect in audio production that adds echo to the audio signal
Delay echo
Downward Expander
Compressor
An expander can be used to achieve the opposite result of a compressor, expanding the dynamic range rather than compressing it.
Downward Expander
Compressor
Delay echo
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