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Instructions for using the auto-tune program yourself.

Installation instructions

This .zip archive contains the main function, autotune.m, as well as the helper routines pitchShift.m, fusionFrames.m, and createFrames.m. To install the program, first you must extract it from the archive. In Windows, this can be done by right-clicking on the .zip and selecting “extract here.” Similar methods exist for other operating systems. Next, copy all of the files to your MATLAB directory, or any other directory in your MATLAB path. If you copy the files as part of a folder, then the folder must be included in your MATLAB path for MATLAB to find the autotune function.

The pitch shifting code is a slight modification of the “Guitar Pitch Shifter” from this site . Note that while it is open-source, there may be legal issues with redistributing this code. Do so at your own risk. These issues can be avoided by substituting the pitch shifter for your own pitch shifting code, replacing the call to pitchShift() in autotune.m.

Using the program

The autotune function takes in five arguments, X, pMin, pMax, w, and Fs.

X is the input signal, which is a matrix of amplitudes in either mono (one column) or stereo (two columns). This matrix can be extracted from a .wav file with the wavread command in MATLAB.

pMin is the minimum frequency in which we expect to find a peak, and pMax is the maximum, in Hz. We suggest passing in 60 for pMin and 1050 for pMax to cover the human vocal range, but this interval may need to be expanded for other instruments. In general, the narrowest possible interval covering all played notes is preferable, as this grants the greatest chance of correctly detecting the correct note.

w is the width of the window to correct as if it were an individual note. Note that the current version of the code rounds w to the next power of two, for simplicity. Theoretically, higher values of w would result in less distortion, but also poorer time resolution, where the boundaries between notes would be less precise. We found that 256 was a good value for this parameter.

Finally, Fs is the sampling frequency, in Hz, of the input signal X. This value can be obtained as the second return value of the wavread command, and is commonly either 22050 or 44100. Here is an example of the proper MATLAB commands to auto-tune a vocal sample:

[X, Fs] = wavread('path to input file'); % Read input from .wavout = autotune(X, 60, 1050, Fs); % Process signal wavwrite(out, Fs, 'path to output file'); % Write output to .wav

Alternatively, the output can be played from the MATLAB command line with the following command:

soundsc(out, Fs);

Note that the current version of the code compresses stereo input to mono output, and that execution time can be greatly reduced by processing only a portion of the input song. Please enjoy our code, and feel free to modify and improve upon it!

Questions & Answers

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s. Reply
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
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Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
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Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
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AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
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Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
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the Beer law works very well for dilute solutions but fails for very high concentrations. why?
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Smarajit Reply
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Source:  OpenStax, Auto-tune. OpenStax CNX. Dec 20, 2012 Download for free at http://cnx.org/content/col11474/1.1
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