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Acoustic theory explained

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on 26 June 2015

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Transcript of Acoustic theory explained

What is it?
Waves and wavelength were briefly touched upon previously as waves are such a broad topic as they are everywhere ill focus on how they are important in musical terms.
When talking about acoustic theory it falls into 3 categorys
Frequency
Waves and wave length
Amplitude
Acoustic theory explained
by Louis baker
Frequency
What is it?
Well frequency is more commonly associated with which is known as pitch, where this is true in some ways frequency is all about the form of a wave, here are some examples;
Waves and wavelength
Amplitude
What does acoustic theory comprise of?
Waves come in a variety of forms but onto the later, the space between the arcs in a wave determine the frequency of the wave.
Waves are important because that is how sound travels. Wavelength the length of one wave. It's the distance between one high pressure region to the next. but sound waves need particles to vibrate through to be heard, for example we can only hear because the sound vibrates through the air, but in space we cant hear as there are no particles that the sound can vibrate through.
waves through air
waves through water
what is it?
Amplitude is all about the size of the wave, by size i don't mean how long i mean how high the waves peak and low the trough is.
Synthesizers
LFO Low Frequency Oscillator
Synth history
Filter
ADSR envelope
Sources
How does this relate to acoustic theory
The components
LFO (low frequency oscillator)
Filter
ADSR (envelope)
The beginnings of the synthesizer are difficult to trace, as there is confusion between sound synthesizers and arbitrary electric/electronic musical instruments.
In 1897, Thaddeus Cahill invented Teleharmonium (or Dynamophone) utilizing dynamo (early electric generator),and it had the capability of additive synthesis also seen on Hammond organ later invented in 1934.
Low frequency oscillator (LFO) – an oscillator of adjustable frequency that can be used to modulate the sound rhythmically to control a filter's operating frequency. LFOs are used in most forms of synthesis.
Electronic filters are particularly important in subtractive synthesis, being designed to pass some frequency regions through unattenuated while significantly attenuating ("subtracting") others. The low-pass filter is most frequently used, but band-pass filters, band-reject filters and high-pass filters are also sometimes available.
When an acoustic musical instrument produces sound, the loudness and spectral content of the sound change over time in ways that vary from instrument to instrument. The "attack" and "decay" of a sound have a great effect on the instrument's sonic character.

Acoustic theory basics is what allowed people to create synthesizers with there knowledge of waves.
http://en.wikipedia.org/wiki/Synthesizer
http://www.gear4music.com/synth.html
http://www.synthesizers.com/
http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/waves/
http://www.innovativesynthesis.com/basic-synthesis-part-1-%E2%80%93-oscillators/
Attack Decay Sustain Release
ADSR is how we can visualize sounds
Square wave
Triangle wave
Synthesizers are just the manipulation of those waves to make different and unique sounds
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