S?

1
S?µp?es? ????
2
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
3
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
???????µ?? s?µp?es?? ??a? a??????µ?? p?? ??e? ??
st??? t?? s?µp?es? ded?µ???? e?s?d?? (ap??
µe??d?????a ??a s?µp?es? t?? ded?µ????).
4
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
???????µ?? s?µp?es?? ??a? a??????µ?? p?? ??e? ??
st??? t?? s?µp?es? ded?µ???? es?d?? (ap??
µe??d?????a ??a s?µp?es? t?? ded?µ????).
S?µp?est?? (codec) µ?a ?e????te?? d?ad??as?a
s?µp?es?? p?? µp??e? ?a pe???aµß??e?
pe??ss?te???? ap? ??a? a??????µ??? s?µp?es??
(p???p???? µe??d?????a s?µp?es?? ap?s?µp?es??)
5
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
???????µ?? s?µp?es?? ??a? a??????µ?? p?? ??e? ??
st??? t?? s?µp?es? ded?µ???? es?d?? (ap??
µe??d?????a ??a s?µp?es? t?? ded?µ????).
S?µp?est?? (codec) µ?a ?e????te?? d?ad??as?a
s?µp?es?? p?? µp??e? ?a pe???aµß??e?
pe??ss?te???? ap? ??a? a??????µ??? s?µp?es??
(p???p???? µe??d?????a s?µp?es?? ap?s?µp?es??)
CODEC
???????µ?? a
???????µ?? ß
???????µ?? ?
6
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
???????µ?? s?µp?es?? ??a? a??????µ?? p?? ??e? ??
st??? t?? s?µp?es? ded?µ???? es?d?? (ap??
µe??d?????a ??a s?µp?es? t?? ded?µ????).
S?µp?est?? (codec) µ?a ?e????te?? d?ad??as?a
s?µp?es?? p?? µp??e? ?a pe???aµß??e?
pe??ss?te???? ap? ??a? a??????µ??? s?µp?es??
(p???p???? µe??d?????a s?µp?es?? ap?s?µp?es??)
(MPEG, JPEG, DivX)
CODEC
???????µ?? a
???????µ?? ß
???????µ?? ?
7
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
????f?s????????? s?µp?est?? (mp3, jpeg, mpeg)
8
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
????f?s????????? s?µp?est?? (mp3, jpeg, mpeg)

• ?e?t?????a afa??es? p????f???a? p?? de? ???eta?
  a?t???pt? ap? t?? ?????p?

9
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
??G?? ???S?S ??S S?????S?S
10
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
??G?? ???S?S ??S S?????S?S

• ?p????e?s?

11
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
??G?? ???S?S ??S S?????S?S

• ?p????e?s?
• ?et?d?s? - ??apa?a????

12
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
??G?? ???S?S ??S S?????S?S

• ?p????e?s?
• ?et?d?s? - ??apa?a????
• ?etafe?s?µ?t?ta

13
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
??G?S S?????S?S ??T??S S?????S?S
14
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
??G?S S?????S?S ??T??S S?????S?S
????? s?µp?es?? a????? µ??e??? ded?µ???? /
µ??e??? s?µp?esµ???? ded?µ????
??. 31, 201
15
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
??G?S S?????S?S ??T??S S?????S?S
????? s?µp?es?? a????? µ??e??? ded?µ???? /
µ??e??? s?µp?esµ???? ded?µ????
??. 31, 201
???µ?? s?µp?es?? ? ???µ?? µet?d?s?? t??
s?µp?esµ???? p????f???a?
16
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
???F?S S?????S?S
17
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
???F?S S?????S?S
??O??S???? (LOSSY)
MH ??O??S???? (LOSSLESS)
18
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
???F?S S?????S?S
??O??S???? (LOSSY)
MH ??O??S???? (LOSSLESS)
? p????f???a µet? t?? ap???d???p???s?
a?apa???eta? a???ß?? ?d?a
19
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
???F?S S?????S?S
??O??S???? (LOSSY)
MH ??O??S???? (LOSSLESS)
? p????f???a µet? t?? ap???d???p???s?
a?apa???eta? a???ß?? ?d?a
? p????f???a µet? t?? ap???d???p???s?
a?apa???eta? µe ap??e?a
20
S?µp?es? ????
S?µp?es? ? d?ad??as?a epa?a??d???p???s?? t??
e?peµp?µe??? ??f?a??? p????f???a? µe st??? t??
µet?d?s? t?? ?d??? ???t???? pe??e??µ???? a??? µe
µ????te?? ???? ded?µ????.
???F?S S?????S?S
??O??S???? (LOSSY)
MH ??O??S???? (LOSSLESS)
? p????f???a µet? t?? ap???d???p???s?
a?apa???eta? a???ß?? ?d?a
? p????f???a µet? t?? ap???d???p???s?
a?apa???eta? µe ap??e?a
??µet???e?s? ????f?s????????? pe?????sµ?? t??
a????p???? a?s??t????? ???????
?fa?µ??? ????a???st???? µ??t????
21
S?µp?es? ????
(?? ap??est???)
1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1
0 0 0 1 1 1 1 0 0 0 0 0 0 1 1 1 1
3x1 8x0 6x1 5x0 3x1 3x0 4x1 6x0 4x1
1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1
0 0 0 1 1 1 1 0 0 0 0 0 0 1 1 1 1
(???????µ?? ap???p?? pe??ss?te??? ap? 5 ??f?a)
(?p??est???)
1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1
0 0 0 1 1 1 1 0 0 0 0 0 0 1 1 1 1
3x1 5x0 5x1 5x0 3x1 3x0 4x1 5x0 4x1
1 1 1 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 1 1 1 0 0 0 1
1 1 1 0 0 0 0 0 1 1 1 1
22
S?µp?es? ????
S?????S? ????S??????S???
23
S?µp?es? ????
S?????S? ????S??????S???
?etas??µat?sµ?? ? µa??µat??? d?ad??as?a p??
a?t?st???e? µ?a se??? t?µ?? se µ?a ???? se???
t?µ?? (µe ß?s? ??p??? a??????µ?)
24
S?µp?es? ????
S?????S? ????S??????S???
?etas??µat?sµ?? ? µa??µat??? d?ad??as?a p??
a?t?st???e? µ?a se??? t?µ?? se µ?a ???? se???
t?µ?? (µe ß?s? ??p??? a??????µ?)
?etas??µat?µ?? Fourier (Fourier Transform) o
µetas??µat?sµ?? µ?a? s????t?s?? ap? t? ped?? t??
?????? st? ped?? t?? s????t?t??.
25
S?µp?es? ????
S?????S? ????S??????S???
?etas??µat?sµ?? ? µa??µat??? d?ad??as?a p??
a?t?st???e? µ?a se??? t?µ?? se µ?a ???? se???
t?µ?? (µe ß?s? ??p??? a??????µ?)
?etas??µat?µ?? Fourier (Fourier Transform) o
µetas??µat?sµ?? µ?a? s????t?s?? ap? t? ped?? t??
?????? st? ped?? t?? s????t?t??.
p??t?? (Db)
p??t?? (Db)
?????? (sec)
s????t?ta (Hz)
26
S?µp?es? ????
S?????S? ????S??????S???
?etas??µat?sµ?? ? µa??µat??? d?ad??as?a p??
a?t?st???e? µ?a se??? t?µ?? se µ?a ???? se???
t?µ?? (µe ß?s? ??p??? a??????µ?)
?etas??µat?µ?? Fourier (Fourier Transform) o
µetas??µat?sµ?? µ?a? s????t?s?? ap? t? ped?? t??
?????? st? ped?? t?? s????t?t??.

• ???sd?????e? t? p??t?? t?? ???e µ?a? ap? t??
  s????t?te? st?? ?p??e? a?a??eta? ? a?????
• ??e??????e? t?? a????e?s? t?? ????a????
  s????t?t?? se ??a s?µa (?eµe???de??)

p??t?? (Db)
p??t?? (Db)
?????? (sec)
s????t?ta (Hz)
27
S?µp?es? ????
S?????S? ????S??????S???
?etas??µat?sµ?? ? µa??µat??? d?ad??as?a p??
a?t?st???e? µ?a se??? t?µ?? se µ?a ???? se???
t?µ?? (µe ß?s? ??p??? a??????µ?)
?etas??µat?µ?? Fourier (Fourier Transform) o
µetas??µat?sµ?? µ?a? s????t?s?? ap? t? ped?? t??
?????? st? ped?? t?? s????t?t??.

• ???sd?????e? t? p??t?? t?? ???e µ?a? ap? t??
  s????t?te? st?? ?p??e? a?a??eta? ? a?????
• ??e??????e? t?? a????e?s? t?? ????a????
  s????t?t?? se ??a s?µa (?eµe???de??)

28
S?µp?es? ????
S?????S? ????S??????S???
??????? S???S?
29
S?µp?es? ????
S?????S? ????S??????S???
??????? S???S? ?? fa???µe?? ap??????? s????t?t??
?ta? a?t?? ß??s???ta? se ???t??? ??????? ap?stas?
ap? ????a??e? s????t?te? µe?a??te??? ??tas??
(auditory masking)
30
S?µp?es? ????
S?????S? ????S??????S???
K?d???p???s? µe a??????µ? mp3 ßas??? d?ad??µ?
s?µat??
31
S?µp?es? ????
S?????S? ????S??????S???
?a?ade??µata ap?d?s?? a??e??? mp3
PCM CD stereo 1.44Mbps