אפקה - המכללה האקדמית להנדסה בתל אביב | תערוכת פרויקטי גמר 2014 - קטלוג פרויקטים - page 235

Student name:
KatiaRaichlin
Department:
Medical Engineering
Advisor name:
Dr. Zehava Blechman
Application forMeasuringSpeechRate (PartA)
Results
Method
• The application has the potential to optimize speech therapy by providing
the patient real-time feedback on his exercises, thus allowing him to learn to
control his speech fluency.
• The application is a simple and user friendly tool which enables patients to
alter their speech outside the clinician’s office: at home, at work, etc.
• The application is currently designed for adults users. With some
modifications, it could beused also in children’s stuttering therapy.
Conclusions
Fig.1:
Milestones of theDSP algorithm
• The voice input was recordedwith
Smart Voice recorder (Android
application).
• The voice signal was sampled at
sample rate of 16KHz , 16 bits per
sample (a common setting inDSP).
• TheDSPalgorithm waswritten
using Matlab.
Fig.A
Fig.B
Fig.C
Fig.D
• Figures A-C represent analysis of
one speaker.
• Calculation of theSTM (Fig. B)
enables us to recognize the
boundaries between twoadjacent
phonemes in order toevaluate the
speech rate of the subject (Fig. C).
• Fig. D describes the accuracy of the algorithm. The correct number of
boundaries is represented as 100%. If the algorithm detects less
boundaries, the accuracy<100%. If the algorithm detectsmore boundaries,
the accuracy>100%.
0
1
2
3
4
5
6
80
-
85 85
-
90 90
-
95 95
-
100 100
-
105105
-
110 110
-
115
Number of experiments [#]
Boundary detection percentage [%]
Algorithmaccuracy (18 subjects)
10
20
30
40
50
60
70
80
90
100 107
6.2
6.4
6.6
6.8
7
7.2
7.4
7.6
Speech rate
Time [sec]
Number of phonemes (divided by time) [#]
0
2
4
6
8
10
12
14
16
x 10
4
-0.25
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
Sample index [#]
N
ormalized
Amplitude [V]
Original signal
0
100
200
300
400
500
600
700
0
0.5
1
1.5
2
2.5
SpectralTransitionMeasure
Frame index [#]
STM
2014
--
2
1...,236,237,238,239,240,241,242,243,244,245 225,226,227,228,229,230,231,232,233,234,...276