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Feb
r
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201
8
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2
4
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C
MSI
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
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4752
I
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J
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&
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p
Sci,
Vo
l
.
9
,
No
.
2
,
Feb
r
u
ar
y
201
8
:
2
4
9
–
252
250
Fig
u
r
e
1
.
Dig
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Au
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Sig
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7
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s
a
n
d
ex
tr
e
m
el
y
lo
w
-
p
o
w
er
d
ig
ital
s
i
g
n
al
p
r
o
ce
s
s
o
r
s
,
h
ea
r
in
g
aid
s
ca
n
b
e
co
n
s
tr
u
cted
w
i
th
au
d
io
m
etr
ic
an
d
co
g
n
it
iv
e
i
n
tell
ig
en
ce
t
h
at
m
atc
h
e
s
th
e
h
ea
r
in
g
lo
s
s
,
p
h
y
s
ica
l
f
ea
t
u
r
es a
n
d
li
f
est
y
le
o
f
t
h
e
wea
r
er
,
th
u
s
d
eli
v
er
in
g
m
o
r
e
v
a
l
u
e
an
d
b
en
e
f
it
f
o
r
th
e
h
ea
r
i
n
g
i
m
p
air
ed
p
er
s
o
n
.
3.
O
VE
RA
L
L
S
YST
E
M
DE
SI
G
N
AND
I
T
S F
E
A
T
UR
E
S
T
h
e
Ov
er
all
S
y
s
te
m
Desi
g
n
f
o
r
h
ea
r
-
clea
r
as s
h
o
w
n
i
n
Fi
g
u
r
e
2
(
b
)
.
3
.
1
.
Audi
o
DAC
a
nd
M
E
M
S
M
ic
ro
ph
o
ne
A
s
ter
eo
Au
d
io
D
A
C
i
s
co
n
tr
o
lled
an
d
co
m
m
u
n
icate
d
b
y
t
h
e
m
ai
n
MCU
u
s
i
n
g
I
2
C
an
d
S
AI
p
r
o
to
c
o
l
in
ter
f
ac
e
r
esp
ec
ti
v
el
y
.
T
h
e
s
o
u
n
d
o
u
tp
u
t
o
f
th
i
s
D
AC
g
o
es
to
th
e
a
u
d
io
a
m
p
l
if
ier
cir
cu
itr
y
to
d
r
iv
e
t
h
e
b
o
n
e
co
n
d
u
cti
n
g
tr
a
n
s
d
u
ce
r
.
T
h
e
au
d
io
in
p
u
t
m
a
y
co
m
e
f
r
o
m
a
M
E
MS
m
icr
o
p
h
o
n
e
(
li
v
e
s
o
u
n
d
)
,
o
r
it
co
u
ld
b
e
th
e
r
ec
o
r
d
e
d
au
d
io
f
iles
(
p
r
e
-
r
ec
o
r
d
ed
au
d
io
)
.
A
n
O
m
n
i
-
d
ir
ec
tio
n
al
ME
MS
au
d
io
s
en
s
o
r
d
ig
ital
m
icr
o
p
h
o
n
e
p
r
o
v
id
es a
d
ig
ital si
g
n
a
l in
P
S
M
f
o
r
m
at
to
th
e
m
icr
o
co
n
tr
o
ll
er
.
3
.
2
.
B
o
ne
Co
nd
uct
ing
T
ra
ns
d
uce
r
T
h
e
s
o
u
n
d
is
n
o
th
in
g
b
u
t
v
ib
r
atio
n
.
B
o
n
e
co
n
d
u
ctio
n
is
o
u
r
b
o
d
y
'
s
n
at
u
r
al
ab
ilit
y
to
tr
an
s
f
er
s
o
u
n
d
th
r
o
u
g
h
a
b
o
n
e
[
8
]
.
T
h
e
s
o
u
n
d
p
r
o
ce
s
s
o
r
co
n
v
er
ts
s
o
u
n
d
in
to
v
ib
r
atio
n
s
w
h
ic
h
ar
e
s
e
n
t
th
r
o
u
g
h
t
h
e
s
k
u
ll
b
o
n
e,
d
ir
ec
tl
y
to
t
h
e
i
n
n
er
ea
r
.
A
b
o
n
e
co
n
d
u
c
tio
n
tr
a
n
s
d
u
ce
r
is
a
s
p
ec
ial
t
y
p
e
o
f
s
p
ea
k
er
t
h
at
h
as
a
m
eta
l
r
o
d
w
r
ap
p
ed
w
it
h
th
e
v
o
ice
co
il.
W
h
en
cu
r
r
en
t
l
y
is
p
u
l
s
ed
th
r
o
u
g
h
th
e
co
il,
th
e
m
a
g
n
etic
f
ie
l
d
ca
u
s
es
a
p
iece
o
f
m
etal
to
e
x
p
an
d
a
n
d
co
n
tr
ac
t
–
cr
ea
tin
g
a
s
p
ea
k
er
w
h
e
n
p
r
e
s
s
ed
a
g
ain
s
t a
f
lat
s
u
r
f
ac
e
[
9]
-
[
1
0
]
.
T
h
e
tr
an
s
d
u
ce
r
is
p
r
ess
ed
u
p
a
g
ai
n
s
t t
h
e
j
a
w
o
r
ea
r
b
o
n
e
to
tu
r
n
t
h
e
s
k
u
ll i
n
t
o
a
s
p
ea
k
er
ca
v
it
y
.
An
a
u
d
io
am
p
li
f
ier
cir
cu
itr
y
i
s
n
ee
d
ed
to
d
r
i
v
e
th
is
s
p
ea
k
er
as
s
h
o
w
n
i
n
Fi
g
u
r
e
2
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
d
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n
esia
n
J
E
lec
E
n
g
&
C
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m
p
Sci
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SS
N:
2502
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4752
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251
Fig
u
r
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2
.
Desig
n
o
f
B
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e
C
o
n
d
u
ctin
g
T
r
an
s
d
u
ce
r
3
.
3
.
Audi
o
A
m
p
lific
a
t
io
n
Ov
er
th
e
co
u
r
s
e
o
f
ti
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e,
th
e
u
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er
m
a
y
h
a
v
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eg
r
ad
in
g
h
ea
r
in
g
le
v
els,
an
d
it
m
i
g
h
t
b
e
im
p
o
r
ta
n
t
to
in
cr
ea
s
e
t
h
e
v
o
l
u
m
e
lev
e
l
to
b
alan
ce
th
at.
T
h
e
d
ev
ice
allo
w
s
th
e
u
s
er
to
c
h
an
g
e
t
h
e
au
d
io
a
m
p
lif
ier
g
ai
n
o
n
th
e
f
l
y
u
s
i
n
g
in
p
u
t b
u
tto
n
s
.
3
.
4
.
O
nb
o
a
rd
F
ile
Sto
ra
g
e
T
h
e
d
ev
ice
h
as
a
b
u
ilt
-
i
n
Q
u
ad
-
SP
I
f
las
h
m
e
m
o
r
y
,
u
s
ed
t
o
s
to
r
e
th
e
au
d
io
f
iles
.
Her
e
W
A
V
t
y
p
e
au
d
io
f
ile
f
o
r
m
at
is
u
s
ed
to
s
to
r
e
th
e
d
ig
ital a
u
d
io
co
n
ten
t.
Fig
u
r
e
3
.
Ov
er
all
S
y
s
te
m
Des
i
g
n
3
.
5
.
E
m
be
dd
ed
M
us
ic
P
la
y
er
T
h
e
d
ev
ice
ac
ts
as
a
s
tan
d
alo
n
e
m
u
s
ic
p
la
y
er
th
at
ca
n
p
lay
m
u
s
ic
d
ir
ec
tl
y
i
n
to
th
e
ea
r
.
Fav
o
u
r
ite
tr
ac
k
s
ca
n
b
e
p
er
m
an
e
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tl
y
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to
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ed
in
t
h
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o
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o
ar
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e
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u
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er
p
r
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s
es
th
e
m
u
s
ic
p
la
y
er
b
u
tto
n
.
3
.
6
.
F
ile
T
ra
ns
f
er
o
v
er
USB
T
h
e
d
ev
ice
is
eq
u
ip
p
ed
w
it
h
USB
co
n
n
ec
t
iv
i
t
y
to
f
ac
i
litate
f
ile
tr
an
s
f
er
s
b
et
w
ee
n
th
e
d
e
v
ice
a
n
d
a
P
C
/L
ap
to
p
.
T
h
e
m
icr
o
co
n
tr
o
ll
er
s
u
p
p
o
r
ts
USB
OT
G
f
u
ll
s
p
ee
d
co
m
m
u
n
icatio
n
v
ia
a
U
SB
co
n
n
ec
to
r
a
n
d
ac
ts
as a
USB
d
ev
ice
w
h
e
n
c
o
n
n
ec
ted
to
th
e
h
o
s
t c
o
m
p
u
ter
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
5
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2
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n
d
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J
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lec
E
n
g
&
C
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m
p
Sci,
Vo
l
.
9
,
No
.
2
,
Feb
r
u
ar
y
201
8
:
2
4
9
–
252
252
3
.
7
.
Act
iv
it
y
T
ra
ck
ing
T
h
e
d
ev
ice
ca
n
ac
tiv
el
y
m
o
n
i
to
r
th
e
u
s
er
m
o
v
e
m
e
n
t
s
u
s
in
g
a
3
D
ac
ce
ler
o
m
eter
an
d
ca
n
s
h
o
w
t
h
e
ac
tiv
it
y
/i
n
ac
ti
v
it
y
r
atio
o
n
th
e
s
m
ar
tp
h
o
n
e
ap
p
.
T
h
is
ex
ten
d
s
th
e
d
ev
ice
i
n
to
f
it
n
e
s
s
u
s
a
g
e
p
u
r
p
o
s
es.
3
.
8
.
Ca
pa
cit
iv
e
T
o
uch Co
ntr
o
l
A
s
et
o
f
ca
p
ac
iti
v
e
to
u
ch
b
u
tt
o
n
s
o
n
t
h
e
s
u
r
f
ac
e
o
f
th
e
in
s
tr
u
m
e
n
t
allo
w
s
th
e
u
s
er
to
en
te
r
th
e
i
n
p
u
t
u
s
i
n
g
s
i
m
p
le
to
u
c
h
g
e
s
t
u
r
es.
A
ca
p
ac
itiv
e
to
u
c
h
k
e
y
p
ad
co
n
tr
o
ller
s
ca
n
s
th
e
i
n
p
u
t
el
ec
tr
o
d
es
an
d
u
p
o
n
r
ec
o
g
n
izi
n
g
a
u
s
er
b
u
tto
n
p
r
ess
ev
e
n
t,
in
f
o
r
m
s
it to
th
e
m
ai
n
m
icr
o
co
n
tr
o
ller
.
4.
CO
NCLU
SI
O
N
W
e
p
r
o
p
o
s
ed
th
is
s
y
s
te
m
b
a
s
ed
o
n
an
ex
ten
s
i
v
e
s
tu
d
y
c
o
n
s
id
er
in
g
s
ev
er
al
s
p
ee
c
h
es
an
d
m
u
s
ic
s
ig
n
al
s
a
n
d
also
d
i
f
f
er
en
t
f
ee
d
b
ac
k
p
ath
s
.
I
t
h
a
s
b
ee
n
d
esi
g
n
ed
a
s
m
ar
t
ea
r
p
l
u
g
s
y
s
te
m
in
te
g
r
ated
w
it
h
n
o
n
-
in
v
a
s
i
v
e
b
o
n
e
co
n
d
u
ctio
n
tec
h
n
iq
u
e
w
h
ich
i
s
ca
p
ab
le
o
f
d
o
in
g
s
o
m
e
ad
v
a
n
ce
d
au
d
io
p
r
o
ce
s
s
in
g
to
p
r
o
v
id
e
v
o
ice
en
h
a
n
cin
g
a
n
d
n
o
is
e
f
i
lter
ed
au
d
io
f
o
r
th
e
h
ea
r
in
g
i
m
p
a
ir
ed
p
eo
p
le.
T
h
e
r
esu
lts
s
h
o
w
a
n
ex
ce
llen
t
p
er
f
o
r
m
a
n
ce
r
e
g
ar
d
in
g
e
n
tr
ai
n
m
e
n
t
p
r
ev
en
tio
n
a
n
d
ad
ap
t
atio
n
s
p
ee
d
.
T
h
e
s
y
s
te
m
h
as
a
s
tr
o
n
g
p
r
ac
tical
r
elev
an
ce
b
ec
au
s
e
o
f
t
h
e
ac
ce
p
tab
le
co
m
p
u
tatio
n
al
co
m
p
lex
it
y
an
d
th
e
ab
ilit
y
to
p
er
f
o
r
m
v
er
y
s
ati
s
f
ac
to
r
il
y
u
n
d
er
a
lar
g
e
v
ar
ie
t
y
o
f
a
u
d
io
s
ig
n
al
s
an
d
ac
o
u
s
t
ic
f
ee
d
b
ac
k
s
ce
n
ar
io
s
.
RE
F
E
R
E
NC
E
S
[1
]
M
o
o
n
e
n
M.
,
“
A
c
o
u
stic
f
e
e
d
b
a
c
k
c
o
n
tro
l:
S
tate
o
f
th
e
a
rt
a
n
d
f
u
tu
re
c
h
a
ll
e
n
g
e
s
,”
Pro
c
e
e
d
in
g
s
o
f
t
h
e
IEE
E
,
v
o
l/
issu
e
:
9
9
(2
)
,
p
p
.
2
8
8
–
3
2
7
,
2
0
1
1
.
[2
]
Ag
n
e
w
J
.
a
n
d
T
h
o
rn
to
n
J
.
M.
,
“
Ju
st
n
o
ti
c
e
a
b
le
a
n
d
o
b
jec
ti
o
n
a
b
le
g
ro
u
p
d
e
lay
s
in
d
ig
it
a
l
h
e
a
rin
g
a
id
s
,”
J
o
u
r
n
a
l
o
f
th
e
Ame
ric
a
n
Ac
a
d
e
my
o
f
Au
d
io
l
o
g
y
,
v
o
l
/i
ss
u
e
:
11
(6
)
,
p
p
.
3
3
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-
3
3
6
,
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0
0
0
.
[3
]
A
.
S
a
lh
,
e
t
a
l.
,
“
M
a
x
i
m
izin
g
E
n
e
rg
y
E
ff
icie
n
c
y
f
o
r
Co
n
su
m
p
ti
o
n
Circu
it
P
o
w
e
r
in
Do
w
n
li
n
k
M
a
ss
iv
e
M
IM
O
W
irele
ss
N
e
t
w
o
rk
s
,
”
In
ter
n
a
ti
o
n
a
l
J
o
u
rn
a
l
o
f
El
e
c
trica
l
a
n
d
Co
mp
u
ter
En
g
i
n
e
e
rin
g
,
v
o
l/
issu
e
:
7
(6
),
p
p
.
2
9
7
7
-
2
9
8
5
,
2
0
1
7
.
[4
]
S
u
b
ra
m
a
n
ian
D
.
D
.
P.
,
“
De
sig
n
o
f
a
S
in
g
le
In
p
u
t
F
u
z
z
y
L
o
g
ic
C
o
n
tr
o
ll
e
r
Ba
se
d
S
V
C
f
o
r
Dy
n
a
m
ic
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e
rf
o
rm
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n
c
e
En
h
a
n
c
e
m
e
n
t
o
f
P
o
w
e
r
S
y
ste
m
s
.”
[5
]
M.
A
.
M
a
n
iv
a
sa
g
a
m
a
n
d
T
.
A
n
a
n
th
a
n
,
“
A
n
Eff
icie
n
t
S
e
lf
-
R
e
c
o
n
f
ig
u
ra
ti
o
n
a
n
d
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te
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lec
ti
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n
f
o
r
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irele
ss
S
e
n
so
r
Ne
tw
o
rk
s,
”
IJ
M
S
R,
v
o
l/
issu
e
:
9
(
2
)
,
p
p
.
1
9
2
-
1
9
9
,
2
0
1
7
.
[6
]
M
.
A
n
w
a
r,
e
t
a
l.
,
“
W
irele
s
s
Bo
d
y
Are
a
Ne
t
w
o
rk
s
f
o
r
He
a
lt
h
c
a
r
e
A
p
p
li
c
a
ti
o
n
s:
A
n
Ov
e
r
v
ie
w
,
”
T
EL
KOM
NIKA
(
T
e
lec
o
mm
u
n
ica
ti
o
n
Co
mp
u
ti
n
g
El
e
c
tro
n
ics
a
n
d
C
o
n
tro
l)
,
v
o
l/
issu
e
:
1
5
(
3
)
,
2
0
1
7
.
[7
]
M
.
M
e
k
k
i
a
n
d
O
.
A
b
d
a
ll
a
h
,
“
De
v
e
lo
p
m
e
n
t
o
f
a
W
irele
ss
S
e
n
so
rs
Ne
tw
o
rk
f
o
r
G
r
e
e
n
h
o
u
se
M
o
n
i
to
ri
n
g
a
n
d
Co
n
tr
o
l
,
”
I
n
d
o
n
e
sia
n
J
o
u
rn
a
l
o
f
El
e
c
trica
l
En
g
in
e
e
rin
g
a
n
d
In
f
o
r
ma
ti
c
s (
IJ
EE
I)
,
v
o
l/
issu
e
:
5
(
3
)
,
2
0
1
7
.
[8
]
S
iq
u
e
ira
M
.
G
.
a
n
d
A
.
A
l
w
a
n
,
“
S
tea
d
y
-
sta
te
a
n
a
l
y
sis
o
f
c
o
n
ti
n
u
o
u
s
a
d
a
p
tati
o
n
in
a
c
o
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stic
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e
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d
b
a
c
k
re
d
u
c
ti
o
n
s
y
ste
m
s f
o
r
h
e
a
rin
g
-
a
id
s
,”
IEE
E
T
ra
n
sa
c
ti
o
n
s
o
n
S
p
e
e
c
h
a
n
d
Au
d
i
o
Pro
c
e
ss
in
g
,
v
o
l/
iss
u
e
:
8
(
4
)
,
p
p
.
443
-
4
5
3
,
2
0
0
0
.
[9
]
L
iu
n
i
M
.
,
e
t
a
l.
,
“
A
u
to
m
a
ti
c
a
d
a
p
tatio
n
o
f
th
e
ti
m
e
-
f
r
e
q
u
e
n
c
y
re
so
lu
ti
o
n
f
o
r
so
u
n
d
a
n
a
ly
sis
a
n
d
re
-
s
y
n
th
e
sis
,”
IEE
E
T
ra
n
sa
c
ti
o
n
s
o
n
Au
d
i
o
,
S
p
e
e
c
h
,
a
n
d
L
a
n
g
u
a
g
e
Pro
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e
ss
in
g
,
v
o
l/
issu
e
:
21
(
5
)
,
p
p
.
9
5
9
-
9
7
0
,
2
0
1
3
.
[1
0
]
G
il
-
Ca
c
h
o
J
.
M
.
,
e
t
a
l.
,
“
T
ra
n
sfo
rm
d
o
m
a
in
p
re
d
ictio
n
e
rr
o
r
m
e
th
o
d
f
o
r
im
p
ro
v
e
d
a
c
o
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stic
e
c
h
o
a
n
d
f
e
e
d
b
a
c
k
c
a
n
c
e
ll
a
ti
o
n
,”
i
n
S
i
g
n
a
l
Pro
c
e
ss
in
g
Co
n
fer
e
n
c
e
(
EUS
IPCO)
,
p
p
.
2
4
2
2
-
2
4
2
6
,
2
0
1
2
.
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