<< Chapter < Page
  Speech synthesis   Page 1 / 1
Chapter >> Page >
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

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
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.
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
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
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
good afternoon madam
what is system testing
what is the application of nanotechnology?
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
anybody can imagine what will be happen after 100 years from now in nano tech world
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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.
Ali Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Speech synthesis. OpenStax CNX. Dec 18, 2004 Download for free at http://cnx.org/content/col10253/1.7
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Speech synthesis' conversation and receive update notifications?