SAB9075H Просмотр технического описания (PDF) - Philips Electronics

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SAB9075H

Picture-in-Picture (PIP) controller for NTSC

Philips Electronics 

Philips Semiconductors

Picture-in-Picture (PIP) controller for NTSC

Preliminary specification

SAB9075H

FUNCTIONAL DESCRIPTION

Acquisition area

The acquisition area is in the centre of the visible screen

area. Vertically 228 lines are sampled. Horizontally

672 Y-pixels are processed. The exact active processing

area can be fine tuned in horizontal (2 pixels/steps,

16 steps) and vertical (1 line/step, 16 steps) direction for

both main and sub-channel by the I2C-bus (see Fig.3). The

given numbers are pixel numbers at a 13.5 MHz data rate.

The signals, which are dependent on the I2C-bus registers,

can also be related to the Hsync, in which event they are

delayed by 68 pixels.

Chrominance format

The chrominance format is 4 : 1 : 1.

The YUV signals are sampled at a rate of 27 MHz and then

filtered and subsampled to a data rate of 13.5 MHz.

It is expected that the input signals do not contain

frequencies outside the video bandwidth (YBW = 4.5 MHz;

UBW and VBW = 1.125 MHz).

Display area

The display area is shown in Fig.4. The given numbers are

pixels at a data rate of 13.5 MHz. The signals are related

to the burstkey and the Vsync. Dependent on the I2C-bus

registers the signals can also be related to the Hsync.

The internal 13.5 MHz data rate is upsampled to the

double frequency (27 MHz) and then fed to the DACs.

The display output can be fine positioned by the I2C-bus in

64 steps of 4 pixels in horizontal direction and 64 steps of

1 line/field in vertical direction.

32

handbook, full pagewidth

clamp

68

H sync

burstkey

80 FT

Vsync 104 FT

18 FT

864

672

624

1/1, 1/3 and 1/4 reduction

1/2 reduction

262.5

228

18 FT

February 1995

Fig.3 Acquisition area.

9

MBE085

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