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SAA4974H Datasheet(PDF) 11 Page - NXP Semiconductors

Part # SAA4974H
Description  Besic without ADC
Download  28 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SAA4974H Datasheet(HTML) 11 Page - NXP Semiconductors

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1998 Apr 21
11
Philips Semiconductors
Product specification
Besic without ADC
SAA4974H
7.1.3
Y-PEAKING
A linear peaking is applied, which amplifies the luminance
signal in the middle and the upper ranges of the
bandwidth.
The filtering is an addition of:
• The original signal
• The original signal band-passed with centre
frequency = 1
4fs
• The original signal high-passed with maximum gain at
frequency = 1
2fs.
The band-passed and high-passed signals are weighted
with factors 0, 1
8, 14 and 12. The impulse response
becomes [
−α, −β, 1 + 2α +2β, −β, −α], where α is the
band-pass weighting factor and
β the high-pass weighting
factor.
Coring is added to obtain no gain for low amplitudes in the
(high-pass + band-pass) signal, which is then considered
to be noise. Coring levels can be programmed as 0 (off),
+1/
−2, +3/−4 and +7/−8 LSB at 8-bit word.
Fig.7
Peaking transfer function with variation of
β
(
α = 18).
(1)
β = 12.
(2)
β = 14.
(3)
β = 18.
(4)
β =0.
handbook, halfpage
0
0
2
4
6
8
10
12
1/4fs
1/2fs
MGE097
IH_PeakingI
(dB)
(1)
(2)
(3)
(4)
Fig.8
Peaking transfer function with variation of
β
(
α = 14).
(1)
β = 12.
(2)
β = 14.
(3)
β = 18.
(4)
β =0.
handbook, halfpage
0
0
2
4
6
8
10
12
1/4fs
1/2fs
MGE098
IH_PeakingI
(dB)
(1)
(2)
(3)
(4)


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