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OM5721

STB5660 (Set-Top Box) STB concept

Philips Electronics 

Philips Semiconductors

STB5660 (Set-Top Box) STB concept

Product specification

OM5721

SCREEN

FEATURE

Anti-flickering

Grab frame store to

OSD and scale 1⁄4

continuously location

The anti-flickering demonstration highlights the functions available in the SAA7215 to reduce

the line flickering in graphics regions. During this demonstration, 2 graphics regions are

displayed. One with anti-flickering and one without. The contents of the bit map in the regions

is one that shows flickering without anti-flicker measures active. Video and audio decoding are

still active and visible during the demonstration.

A picture of the running video is grabbed and displayed 1⁄4 of its original size as a 16-bit, bit

map on a graphics plane. The picture data of an I or P picture is copied from a frame store to

SDRAM2 memory. During the copy the format of the data is converted from 4 : 2 : 0 format to

4 : 2 : 2 and converted into the graphics memory bit map format. Then the picture is displayed

on the screen.

Scale 1⁄9 of 16 bit per

pixel graphics

location

Menu

The demonstration runs continuously. It displays the running video while a graphics region 1⁄4

of the screen size is in the top left corner. This graphics region is showing the I- and P-pictures

of the running video.

This demonstration shows a 16 bit /pixel bit map in an OSD region on the screen. This picture

will be scaled to a factor 1⁄4 and 1⁄9 of the original size and displayed on the screen, after the

original is removed. The scaling is done by using a software routine that executes a DMU

program. During the demonstration, audio and video is playing.

During all the demonstrations, graphics regions with menu bars and buttons are visible for

control of the demonstration.

Scaling

Cut-out

Letter-box

Continuous

horizontal, vertical

steps

Display of 16 : 9 video on a 4 : 3 display by cutting out 4 : 3 centres and panning/scanning.

This demonstration shows the pan/scan control via the left/right cursor keys. This function

would usually be under control from data in the transport stream.

Display of 16 : 9 video on a 4 : 3 display using letter-boxing.

Allows a window to be selected using the cursor; the video will then be resized to fit the

selected window.

Video control

Video control

Scan, freeze, play, stop

Teletext

Teletext

Switch on and off of the VBI insertion by using a graphics region in VBI lines.

Debug

Event logging

User enabled event logging provided via the RS232 debug socket.

1999 May 05

15

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