0.1 The source filter model of speech

 Page 1 / 1
How speech can be modeled as a source signal passing through a filter.

The make-up of speech

The components of speech are the words and the voice .

Every phrase is a union of these two components - they are the foundations of the spoken language. One or the other does not mean much without its conterpart. Words without voice lackintonation, so they have no meaning. Voice without words is devoid of structure and cannot possibly transfer information. Only the fusion of the two can claim to be such a thing as speech.

In biology, the components of speech are produced in different organs. To speak, air is first released over the vocal cords, which expand and contract to give the air column structure. This isthe biological concept of words. The words are then passed through the vocal tract where they are shaped, givingthem intonation. This shaping of the words is the biological concept of voice. Such a biological process can be easily modeled.

So far, we have determined that speech is a collection of words shaped by voice. Here, we present a model of this. In this model, the words are called the source . Since the words are modified by voice, we say the source passes through a filter . This brings us to the source filter model of speech.

Source Filter Model
The source filter model is a model of speech where the spoken word is comprised of a source component originating from the vocal cords whichis then shaped by a filter immitating the effect of the vocal tract.

This model has possibility for application in many different fields. We will focus on the topic of signal processing here.

Signal processing considerations

The source filter model can easily be extended to signal processing. The source is simply a signal $x(t)$ . This signal isthe input to the filter and is called the excitation signal since it excites the vocal tract. The vocal tract is a filter similar to all filters we have studied so far: it is a lineartime-invariant system with impulse response $h(t)$ . This is sometimes called the transfer function of speech since it is what transfers the excitation signal to speech - it adds voice to words. Speech is theoutput $y(t)$ of thesource signal $x(t)$ passed through the filter with impulse response $h(t)$ . Thus, theoutput is given by $y(t)=x(t)*h(t)$ . This is depicted below:

Since speech is simply a convolution of a source signal $x(t)$ with a filter'sinput response $h(t)$ , we can analyze these signals to determine the characeristics of a speech signal $y(t)$ . However, wemust first deconvolve these signals so that they can be processed individually. This topic is exploredin the next section covering deconvolution .

References

Huckvale, Mark. "Lecture 8: Source-Filter Model of Speech Production." B214: Phonetic Science: Acoustics of Speech and Hearing. University College London. (External Link) .

Johnson, Don. Connexions module m0049: Modeling the Speech Signal .

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
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
what is the stm
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?
what is a peer
What is meant by 'nano scale'?
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
what is Nano technology ?
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?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
hi
Loga
what does nano mean?
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
Got questions? Join the online conversation and get instant answers!