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This is an overview of three different speach/sound synthesis tools.

Introduction on speech synthesis


The ability to tweak or manipulate a person’s voice has always been useful. Before the advent of digital signal processing, however, this task was extremely hard. In those days, the most sophisticated manipulations could be found in rock and roll synthesizers that used analog devices to distort the noise, producing a pseudo random feel to the voice. Other naïve approaches could be taken to alter somebody’s voice, such as changing the playback speed of the clip or modulating the signal. However, these techniques just resulted in making the person speak with a lower pitch that sounded slurred or a higher pitch that resembled Alvin the Chipmunk.


The goal of this project was to develop a more sophisticated set of voice manipulation tools using digital signal processing by developing software in Matlab. The first and most complicated tool raises or lowers the pitch of a recorded voice without changing the length of the sound or otherwise changing the characteristics of the voice. The second changes the length of the clip without altering the pitch of the voice. The resulting voices from both of these tools should sound as if the original clip had been recorded anew while instructing the person doing the talking to speak more slowly, more quickly, or with a higher or lower pitch. Finally, the third tool randomizes the voice in order to mask the identity of the speaker yet preserve her ability to communicate.

Applications and examples

As you can imagine, there are several potential applications for our new software. An out of tune singer can go back after a recording and tweak his or her voice to match precisely the correct tone regardless of whether the problem persists for the duration of the song or a fraction of a second. If a newscaster’s segment goes over or under the preferred time allotment by a few seconds, his or her speech may be reduced or extended by exactly the necessary amount.

Pitch shifted and randomized speech examples
Unaltered voice Original
Pitch Shifted Voice Up Down
Randomized Voice Random
Length changer speech examples
Unaltered voice Original
Length Changed Voice Slower Faster

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
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Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
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nano basically means 10^(-9). nanometer is a unit to measure length.
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s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
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Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
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Source:  OpenStax, Speech synthesis. OpenStax CNX. Dec 18, 2004 Download for free at http://cnx.org/content/col10253/1.7
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