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附錄 A MPEG7 特徵値公式

表 9 頻率特徵 Frequency Features 公式表[40]

特徵值名稱 公式

AveFeq

[ ]

^{0),0 575}

(

28125 .

38 ≤ ≤

>

= ×

∑ ∑

_i

i M Count frameFeq line

f

frameFeq AveFeq

∑

f⁻

=

1 0

AveBandwidth frameBW =

(

maxMDCT −minMDCT

)

×38.28125 f

frameBW th

AveBandwid

∑

f⁻

=

1 0

表 10 頻譜特徵 Spectrum Features公式表[40]

特徵值名稱 公式

AveSpectralCentroid

[ ]

[ ]

^{,0≤ ≤575}

=

∑ ∑

_i

i M

i Cframe iM

f

=

∑

1 -f

0 Cframe lCentroid

AveSpectra

AveSpectralRollOff

∑

^min

[ ]

^≥

∑ [ ]

0

575

0

85 . 0

R

i M i

M

f lRollOff R

AveRpectra

∑

f⁻

=

1

0 min

AveSpectralFlux ^F

[ ][ ]

^{k i = M}

[

^{k +1}

][ ]

^{i −M}

[ ][ ]

^{k i ,0≤ i≤ 575,0 ≤ k ≤ f −2}

[ ] [ ][ ]

1

2 0

=

∑

⁻ − f

i k F i

lFlux AveSpectra

f

AveFlux

[ ]

,0 575 576

575

0 ≤ ≤

=

∑

^Fluxi _i

AveFlux

AveNZFlux

∑

^575Flux

[ ]

ⁱ

表 11 能量特徵 Energy Features公式表[40]

特徵值名稱 公式

AveRMS

( [ ] )

575 0

576 ,

575 0

2

≤

≤

=

∑

i i RMS M

( )

f AveRMS RMS

∑

f⁻

=

1 0

AveFeatureVariance

[ ] [ ]

575 1

575 , iance 1

FeatureVar − − ≤ ≤

=

∑

^{M i M i} _i

[ ] [ ]

575 Variance 1

AveFeature ₌

∑

^{M i −M i−}

AveNegPower

( [ ] )

575 0

576 , r 0

AveNegPowe

1

0 ≤ ≤

×

=

∑ ∑

⁻ < _i

f

i M Count ^f

AveIntensity

( [ ] )

575 0

, ty

AveIntensi

1 0

2

≤

≤

=

∑ ∑

⁻ _i

f i

f M

AvePower

( [ ] )

575 0

f , AvePower

1

0 ≤ ≤

=

∑ ∑

^{f− M i} _i

AveLowEnergy

[ ]

^{,0 575}

3 . 0 ]

[ ≤ × ≤ ≤

=

∑ ∑

_i

i M

AvePower i

LE M

f AveES LE

∑

f⁻

=

1 0

AveMidEnergy

[ ]

^{] 5.5 ,0 575}

[ 5

.

4 × ≤ ≤ × ≤ ≤

=

∑ ∑

_i

i M

AvePower i

M AvePower

ME

f AveES ME

∑

f⁻

=

1 0

AveHigEnergy

[ ]

^{,0 575}

7 . 0 ]

[ ≥ × ≤ ≤

=

∑ ∑

_i

i M

AvePower i

HE M

f AveES HE

∑

f⁻

=

1 0

AveEnergySequences

( [ ] [ ] )

575 1

, 575

7 . 0

1 ≥ × ≤ ≤

−

= Count M i −M i AvePower i ES

f AveES ES

∑

f⁻

=

1 0

ALPE

( )

f

AveRMS RMS

Count

∑

^{f− < ×}

=

1

0 0.5

ALPE

AveSR

[ ]

^{,0 575}

max 05 . 0 ] [

575 0

≤

× ≤

= ≤

∑ ∑ ∑

_i

i M

MDCT i

SR M

f AveSR SR

∑

f⁻

=

1 0

表 12 頻率能量特徵 Frequency-EnergyFeatures 公式表[40]

特徵值名稱 公式

AveMaxPowerFrequency

f f _MDCT

∑

^×

=

1 -f

0 max 38.28125 rFrequency

AveMaxPowe AveLowFeqPower

[ ]

∑ ∑ [ ]

= ₅₇₅

0 5 0

i M

i low M

f

=

∑

1 -f

0 low

ower AveLowFeqP AveMidLowFeqPower

[ ]

∑ ∑ [ ]

= ₅₇₅

0 13 6

i M

i midlow M

f

=

∑

1 -f

0 midlow eqPower

AveMidLowF AveMidFeqPower

[ ]

∑ ∑ [ ]

= ₅₇₅

0 26 14

i M

i mid M

f

=

∑

1 -f

0 mid

ower AveMidFeqP AveMidHigFeqPower

[ ]

∑ ∑ [ ]

= ₅₇₅

53 27

i M

i midhig M

在文檔中 內文目錄 1. (頁 49-56)