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Unit 14 - Listening Skills for Music Technologists LO4

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Impossible Room

on 10 February 2016

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Transcript of Unit 14 - Listening Skills for Music Technologists LO4

Acoustic environments:


Effect of the acoustic
environment on instruments.

Sound spectrum

Reverberation characteristics

Empty and full hall

Echo
Speaker types and positions

Microphone types and positions

Dead spots
Points to Consider
Points to Consider Cont...
Feedback and electronic
control of the sound

Points to Consider Cont...
What is a Sound Spectrum?

A sound spectrum displays the different
frequencies present in a sound.


Reverberation characteristics
What is Reverberation?
Small Room &
Large Room?
Materials of the Room?
Empty Room &
Full Room?
What Is Echo?
In acoustics, an echo is a reflection
of sound, arriving at the listener
a certain
time
after the direct sound.
The Haas effect

When arrival times of sound differ beyond 40 ms,
the sounds will begin to be heard as distinct.
The increasing time difference is described as
a delay, or an echo.
Consider the use of The Haas Effect in Public Address Systems
Speaker types and positions
Microphone types and positions
Dead Spots

Feedback
Each musician needs to hear their own instrument clearly and distinctly from the other instruments around them. But sometimes the acoustics on stage make this difficult.
The classic stage-monitor design is, of course, the wedge.
The wedge shape angles the sound upwards from
floor level to the musicians' ears.
Links
http://music.arts.uci.edu/dobrian/w14/music151/shuremicrophonetechniques.pdf
Name two types of microphone?
Why do you need microphones?
Spot Miking
Close Miking
Ambient Miking
Room Miking

https://en.wikipedia.org/wiki/Microphone_practice
Waves can interfere so destructively with one another
that they produce
dead spots
, or places where
no sound at all can be heard.

Engineers who design theaters or auditoriums must take into account
sound wave interference
. The shape of the building or stage and the materials used to build it are chosen based on interference patterns.

They want every member of the audience to hear loud, clear sounds.
Wave Interference
When two or more sound waves from different sources are present at the same time, they interact with each other to produce a new wave. The new wave is the sum of all the different waves.

Wave interaction is called interference. If the compressions and the rarefactions of the two waves line up, they strengthen each other and create a wave with a higher intensity. This type of interference is known as constructive.
When the compressions and rarefactions are out of phase, their interaction creates a wave with a dampened or lower intensity. This is destructive interference. When waves are interfering with each other destructively, the sound is louder in some places and softer in others. As a result, we hear pulses or beats in the sound.
Dead spots occur when the compressions of one wave line up with the rarefactions from another wave and cancel each other.
What is feedback?
Audio feedback (also known as acoustic feedback, simply as feedback, or the Larsen effect) is a special kind of positive feedback which occurs when a sound loop exists between an audio input (for example, a microphone or guitar pickup) and an audio output (for example, a loudspeaker).
Directivity
Distance
Equalisation
Solid-body instruments are preferred in situations where acoustic feedback may otherwise be a problem
Unit 14: Listening Skills for Music Technologists
LO 4
https://goo.gl/SISHHY
Full transcript