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TRANSCRIPT
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REPORT
ON
JITTER ESTIMATION IN VOICE
Submitted to Dept. of EECE
M.Tech Degree Programme
2013-2015
Of
ITM University, Gurgaon
by
Figure2.3: Example ofa moderatelydysphonic voice classified as Type3 signal
dels of jitter can be used . The first one correspond to that jitter is just a simple variation of
period, which can be found by subtracting each period of the pitch sequence to its neighbour or
combinations of its neighbours. This technique usually provides a single measurement for the
whole signal.
Jitta=
|(n ) (n)|k (2)
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Here Q(n) is the sequence of pitch periods lengths measured in microseconds. For the study
purpose this method is used for calculating jitter. However accepting of other models also
becomes necessary as for the study of severe pathological patients.
The second model can be defined as we assume a pulse like signal, it can be expressed as
s(n)= (n k)k + (n (k ))k (3)
In this model, is the average period and is a value that expresses the displacement of every
other period, in a cyclic perturbation, occurring in every second impulse. The value of can
range from 0 showing no jitter, to P which is defined as the average period length. It is seen that,
for a good comparison of the outcome, if we apply the first model to this second approach, the
estimated jitter value is Jitta = ,where it is assumed that is the half difference of the
subtraction of two periods.[14]
As for the case of a professional singer maintains a fixed fundamental frequency therefore the
above two model represents voice as a signal that has fixed fundamental. So it depends on the
speaker widely that how he could maintain his pitch so that he can be use this model.Now a third
model which is designed to consider the fluctuations of F0can be used which use representing
the changes in period length, alternately which is expressed as;
Q0(n) = Q0+(n-)p+(-1)n (4)
where Q0is the glottal period, prepresents constant variation in the period length, represents
jitter value.
P+ P- P- P+
0Amplitude
0 P+2P 3P-
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Chapter 4. Results
Serial No. Voice(10s-15s) Pratt Matlab
1 Normal Recorded1 0.775 0.801
2Normal Recorded2 0.828 0.963
3NormalRecorded3 0.643 0.753
4 MUNrainbow2 1.022 1.314
5 FMTpateint 2.358 1.981
6 FADNloud 1.825 1.823
7 10mixedsd 1.643 1.5491
8 Frespsd 1.869 1.9581
9 FAB AFTERDVCAN 2.02 1.884
10 FABNCan 2.019 2.26
11 FADNCPafterVoiceTherapy 1.0121 1.28
12 FADNhighpitchv 2.726 2.701
13 MADLOUD 1.05 1.23
14 FADNhighpitchv 2.726 2.701
15 FABductorSDmild 1.87 1.9399
Table:4 Results comparing Pratt and Matlab
First Alphabet: F or M (Female or male)
Second and Third Letters: (AD, AB, MTD, or U)
AD = Adductor Type
AB= Abductor Type
MT= Muscle Tension Dysphonia
UN= Undiagnosed
Fifth and following alphabet: nickname of your choice.
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Appendices
Appendix A: Jitter Estimation in Voice
Paper summarizes jitter parameters and its estimation in a voice signal submitted in STM
journals and accepted under Current Trends in Signal and Processing.
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