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Karplus-Strong Algorithm

Karplus-strong algorithm

How it works

The Karplus-Strong algorithm was developed by Alexander Strong and analyzed by Kevin Karplus as a model of hammered or plucked string instruments. It simulates the sharp impact through a short wideband signal such as a burst of white noise. The signal is fed back through a delay line whose length depends on the frequency of the desired note. The delayed signal is sent through a lowpass filter to attenuate all other frequencies except the frequency of the note and its harmonics.

Karplus-strong algorithm

A diagram representation of a burst of white noise being delayed, filtered, and combined with the original burst. The output sounds like a realistic guitar string pluck.

Concepts

The main concept behind the algorithm is to model the sudden attack of a pluck with white noise containing equal energy in all frequencies. Due to the cavity of the instrument, the instrument material, and various other parameters, only a given frequency and its harmonics will resonate. This is simulated by recursively shaping the output signal. By matching the length of the time delay to correspond with the frequency of the note desired, the output will ultimately sound at the selected frequency given a short period of time. The feedback loop only reinforces the fundamental frequency and its harmonics. This technique is sometimes referred to as a comb filter because of the characteristic shape of the output.

Spectrum of a plucked string

The output of the Karplus-Strong algorithm with its characteristic comb shape. Notice the rapid attenuation of all other frequencies not near a harmonic.

Questions & Answers

how can chip be made from sand
Eke Reply
is this allso about nanoscale material
Almas
are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
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William
currently
William
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Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
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Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
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Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
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ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
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LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
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Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
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Mahi
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Rafiq
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Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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Bob Reply
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Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
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Source:  OpenStax, Elec 301 projects fall 2008. OpenStax CNX. Jan 22, 2009 Download for free at http://cnx.org/content/col10633/1.1
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