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This module provides example inputs and outputs of the piano note detection algorithm using our implementation. It also discusses what our algorithm and implementation do well and what they do inadequately.

The culmination of our efforts resulted in a wide array of both achievements and shortcomings. We discovered many detection techniques that could be coded and implemented easily and effectively. Conversely, there were many nuances and non-ideal behaviors exhibited in even the most simple of piano pieces that a talented musician would have trouble detecting, let alone a program in Matlab.

Achievements

  • High precision in hit detection for reasonably paced songs up to eighth notes
  • High success-rate in note detection for single notes played at a time
  • Effective quantization from frequency to note for well-tuned pianos
  • Very precise note-length determination for all notes actually detected and analyzed

Shortcomings

  • Faults in piano and non-ideal behavior can cause anomalies in output
    • Poor tuning causes note-detection errors
    • Residual ringing after key-release can cause notes to appear longer in duration
  • Chord detection, especially in octaves, is imprecise: some overlapping notes escape detection
  • Poor note-hit detection in “busy” songs
  • Overlapping note-hits causes single, held notes to appear as multiple shorter notes

Examples

We used many different songs to test our algorithm, but these three examples effectively illustrate the above points. The songs are a chromatic scale starting at C5, Mary had a Little Lamb , and the beginning of Pachelbel's Canon in D .

Each example contains the original recording in the top left, a matrix representation of the generated sheet music on the right, and a computer-generated song playing the sheet music in the bottom left. In other words, the generated music is what would be heard if someone were to play the sheet music we generate.

To read the matrix form on the right, read left to right, then top to bottom. Each row contains a set of notes that are played simultaneously, followed by the length of the note. After playing those note(s), proceed to the next line and play those notes. At no time should two notes from different rows both be played.

C5 chromatic scale
The original recording
The generated music

Here, the melody of this simple scale is deciphered perfectly. The only errors being that the previous notes ring through twice (marked in red), and the last note's length was unable to be determined due to the lengthy silence at the end of the recording (marked in blue).

Mary had a little lamb
The original recording
The generated music

Again, this simple song was deciphered perfectly except for previous notes ringing through (marked in red), and the failure to find the last note's length due to the silence at the end of the recording (marked in blue).

Pachelbel's canon in d
The original recording
The generated music

This song shows the greatest shortcoming of our implementation, which is difficulty detecting chords. Again, note that the melody and the note lengths were deciphered perfectly. However, when the quieter, higher harmony begins to play, it does not get picked up (marked in green). Finally, the repeated F#/Gb2 at the end shows how overlapping notes cause a longer note to appear as two shorter notes.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
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
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
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
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
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
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Elec 301 projects fall 2006. OpenStax CNX. Sep 27, 2007 Download for free at http://cnx.org/content/col10462/1.2
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