1999 Sep 24

19

Philips Semiconductors

Preliminary specification

YUV one chip picture improvement based on luminance

vector-, colour vector- and spectral processor

TDA9178

Notes

1. The amount of correction depends on the parameters of the incoming YUV signals; therefore it is not possible to give

exact figures for the correction angle. The aperture angle of the correction range of 45

° (±22.5°) is just given as an

indication and is valid for an input signal with a luminance signal amplitude of 75% and a colour saturation of 50%.

2. The amount of correction depends on the parameters of the incoming YUV signals; therefore it is not possible to give

exact figures for the correction angle.

3. The contour signal cannot be measured separately from the luminance input signal. The contour signal is also

processed by the smart noise controller. The frequency transfer in the peaking mode of the luminance signal can be

derived from the frequency transfer of the selected contour signal, taking into account the summation of the contour

signal and the luminance input signal. The frequency transfer is most easily measured by sine excitation with a

relatively small signal amplitude of 10% of the selected dynamic range of the luminance input, to avoid interaction

with the step detector.

4. Peaking set to minimum. Input signal is a sine wave with the nominal peak-to-peak amplitude corresponding to the

selected input range.

5. Input signal is a 250 kHz block with a rise time of 260 ns and a nominal peak-to-peak amplitude corresponding to the

selected input range.

Overall output group delay performance

−

300

−

ns

−

180

−

ns

adjustment delay U and V signals

w.r.t. Y signal

−32

0

+40

ns

−16

0

+20

ns

Noise measurement

range of noise detector

see Figure 18

−45

−−20

dB

conversion time

−

−

s

Cue flash

CUE FLASH OUTPUT

maximum output voltage

pull-up to external

supply

−−

5.5

V

maximum sink current

−−

1mA

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT