SAF7113 datasheet(16/80 Pages) PHILIPS

16 / 80 page

2000 May 08

Philips Semiconductors

Product speciﬁcation

9-bit video input processor

SAF7113H

8.4

Luminance processing

The 9-bit luminance signal, a digital CVBS format or a

luminance format (S-VHS, HI8), is fed through a

switchable prefilter. High frequency components are

emphasized to compensate for loss. The following

chrominance trap filter (f0 = 4.43 or 3.58 MHz centre

frequency set according to the selected colour standard)

eliminates most of the colour carrier signal. It should be

bypassed via I2C-bit BYPS (subaddress 09H, bit 7) for

S-video (S-VHS, HI8) signals.

The high frequency components of the luminance signal

can be peaked (control for sharpness improvement via

I2C-bus subaddress 09H, see Table 36) in two band-pass

filters with selectable transfer characteristic. This signal is

then added to the original (unpeaked) signal. For the

resulting frequency characteristics see Figs 11 to 18.

A switchable amplifier achieves common DC amplification,

because the DC gains are different in both chrominance

trap modes. The improved luminance signal is fed to the

BCS control located in the chrominance processing block,

see Fig.19.

Fig.11 Luminance control SA 09H, 4.43 MHz trap/CVBS mode, prefilter on, different aperture band-pass centre

frequencies.

handbook, full pagewidth

Y (MHz)

−30

MGD139

(dB)

−18

−6

(1)

(2)

(4)

(3)

(1)

(2)

(4)

(3)

(1) 43H.

(2) 53H.

(3) 63H.

(4) 73H.

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