SAF7118 datasheet(51/173 Pages) PHILIPS

Part #	SAF7118

Description	Multistandard video decoder with adaptive comb filter and component video input

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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51 / 173 page

2004 Jul 22

51

Philips Semiconductors

Product speciﬁcation

Multistandard video decoder with adaptive

comb ﬁlter and component video input

SAF7118

8.4.2

HORIZONTAL SCALING

The overall horizontal required scaling factor has to be split

into a binary and a rational value according to the

equation:

where the parameter of prescaler XPSC[5:0] = 1 to 63 and

the parameter of VPD phase interpolation

XSCY[12:0] = 300 to 8191 (0 to 299 are only theoretical

values). For example, 1

⁄3.5 is to split in 1⁄4 × 1.14286. The

binary factor is processed by the prescaler, the arbitrary

non-integer ratio is achieved via the variable phase delay

VPD circuitry, called horizontal fine scaling. The latter

calculates horizontally interpolated new samples with a

6-bit phase accuracy, which relates to less than 1 ns jitter

for regular sampling scheme. Prescaler and fine scaler

create the horizontal scaler of the SAF7118.

Using the accumulation length function of the prescaler

(XACL[5:0] A1H[5:0]), application and destination

dependent (e.g. scale for display or for a compression

machine), a compromise between visible bandwidth and

alias suppression can be determined.

8.4.2.1

Horizontal prescaler (subaddresses

A0H to A7H and D0H to D7H)

The prescaling function consists of an FIR anti-alias filter

stage and an integer prescaler, which creates an adaptive

prescale dependent low-pass filter to balance sharpness

and aliasing effects.

The FIR prefilter stage implements different low-pass

characteristics to reduce alias for downscales in the range

of 1 to 1

⁄2. A CIF optimized filter is built-in, which reduces

artefacts for CIF output formats (to be used in combination

with the prescaler set to 1

⁄

2 scale); see Table 11.

The function of the prescaler is defined by:

• An integer prescaling ratio XPSC[5:0] A0H[5:0] (equals

1 to 63), which covers the integer downscale

range 1 to 1

⁄

63

• An averaging sequence length XACL[5:0] A1H[5:0]

(equals 0 to 63); range 1 to 64

• A DC gain renormalization XDCG[2:0] A2H[2:0];

1 down to 1

⁄

128

• The bit XC2_1[A2H[3]], which defines the weighting of

the incoming pixels during the averaging process:

– XC2_1 = 0

⇒ 1 + 1...+ 1 +1

– XC2_1 = 1

⇒ 1 + 2...+ 2 +1.

The prescaler creates a prescale dependent FIR low-pass,

with up to (64 + 7) filter taps. The parameter XACL[5:0]

can be used to vary the low-pass characteristic for a given

integer prescale of 1

⁄

XPSC[5:0]. The user can therefore

decide between signal bandwidth (sharpness impression)

and alias.

Equation for XPSC[5:0] calculation is:

Where:

the range is 1 to 63 (value 0 is not allowed);

Npix_in = number of input pixel, and

Npix_out = number of desired output pixel over the

complete horizontal scaler.

The use of the prescaler results in a XACL[5:0] and

XC2_1 dependent gain amplification. The amplification

can be calculated according to the equation:

DC gain = (XC2_1 + 1)

× XACL[5:0] + (1 − XC2_1)

It is recommended to use sequence lengths and weights,

which results in a 2N DC gain amplification, as these

amplitudes can be renormalized by the XDCG[2:0]

controlled

shifter of the prescaler.

The renormalization range of XDCG[2:0] is 1, 1

⁄2 down

to 1

⁄128.

Other amplifications have to be normalized by using the

following BCS control circuitry. In these cases the

prescaler has to be set to an overall gain of

≤1, e.g. for an

accumulation sequence of ‘1 + 1 + 1’ (XACL[5:0] = 2 and

XC2_1 = 0), XDCG[2:0] must be set to ‘010’, this equals 1

⁄4

and the BCS has to amplify the signal to 4

⁄

3 (SATN[7:0]

and CONT[7:0] value = lower integer of 4

⁄3 × 64).

The use of XACL[5:0] is XPSC[5:0] dependent.

XACL[5:0] must be <2

× XPSC[5:0].

XACL[5:0] can be used to find a compromise between

bandwidth (sharpness) and alias effects.

H-scale ratio

output pixel

input pixel

------------------------------

=

H-scale ratio

1

XPSC[5:0]

----------------------------

1024

XSCY[12:0]

-------------------------------

×

=

XPSC[5:0]

lower integer of

Npix_in

Npix_out

-----------------------

=

1

2

N

------

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