Philips LX9000R/22, Service Manual

Page: 164 / 251

Circuit-, IC descriptions and list of abbreviations EN 164 LX9000R 9.
IC7403: SAA6752H (EMPRESS)
2001 Aug 01 3
MPEG-2 video and MPEG-audio/AC-3 audio
encoder with multiplexer
SAA6752HS
1 FEATURES
1.1 Video input and preprocessing
•
Digital YUV input according to “ITU-R BT.656” (8 bits at
27 MHz) and “ITU-R BT.601”
•
Support of enhanced “ITU-R BT.656” input format
containing decoded VBI data readable via I
2
C-bus;
Closed Caption (CC), Wide Screen Signalling (WSS)
and copyright information [Copy Generation
Management System (CGMS)]
•
Processing of non broadcast video signals from analog
VCR according to IEC 756
•
Two video clock input pins for switching two digital video
sources
•
“ITU-R BT.601” format conversion to 1/2D1, 2/3D1 and
Standard Interchange Format (SIF)
•
4 : 2 : 2 to 4 : 2 : 0 colour format conversion
•
Decimation filtering for all format conversions
•
Adaptive median filter and motion compensated filter for
input noise reduction.
1.2 Video compression
•
Real time MPEG-2 encoding compliant to Main Profile at
Main Level (MP@ML) for 625 and 525 interlaced line
systems
•
Supported resolutions: D1, 2/3D1, 1/2D1 and SIF
•
IPB frame, IP frame and I frame only encoding
supported at all modes
•
Supported bit rates: up to 25 Mbit/s I-only encoding;
up to 15 Mbit/s IP-only or IBP encoding.
•
Variable video bit rate mode for constant picture quality
and constant bit rate mode to gain optimum picture
quality from a fixed channel transfer rate
•
Access to bit rate control parameters whilst encoding to
support external real-time control algorithms (e.g.
constrained variable bit rate control)
•
Programmable Group Of Pictures (GOP) structure
•
Innovative motion estimation with wide search range
•
Adaptive quantization
•
Motion compensated noise filter.
1.3 Audio input
•
Audio inputs: I
2
S format or EIAJ format (16, 18 or
20 bits), master or slave mode at 32, 44.1 and 48 kHz
•
Two digital I
2
S input ports for selection between two
digital audio sources
•
Audio clock generation: 256/384
×
f
s
(48 kHz) locked to
video frame rate (if video is present)
•
Sample rate conversion to 48 kHz (locked to video
frame rate) for slave mode operation in all modes except
Digital Versatile Disc (DVD) compliant bypass.
1.4 Audio compression
•
Dolby

(1)
Digital Consumer Encoding (DDCE) also
known as AC-3
(2)
2 channel audio encoding at
256 kbit/s or 384 kbit/s (only for SAA6752HS/01)
•
MPEG-1 layer 2 audio encoding at 256 kbit/s or
384 kbit/s
•
Input data bypass for Linear Pulse Code Modulation
(LPCM) and compressed audio data [MPEG-1,
MPEG-2, Dolby

Digital (DD) and Digital Theatre
System (DTS)] according to IEC 61937
•
Preamble Pc, Preamble Pd and bit stream information
captured for identification of modes during bypass of
compressed audio data for MPEG-1, MPEG-2, DD and
DTS according to IEC 61937
•
Audio mute via I
2
C-bus control for all modes except
DVD-compliant bypass.
1.5 Stream multiplexer
•
Multiplexing of video and audio streams according to the
MPEG-2 systems standard (
“ISO 13818-1”)
•
Generation and output of MPEG-2 Transport Streams
(TS), MPEG-2 Program Streams (PS), Packetized
Elementary Streams (PES) and Elementary Streams
(ES) compliant to the DVD, D-VHS and DVB standards
•
MPEG time stamp (PTS/DTS/SCR/PCR) generation
and insertion (synchronization)
•
Insertion of metadata
•
Optional generation of empty time slots for subsequent
insertion of application specific data packets
•
Optional insertion of user data in the GOP header and in
the picture header.
(1) Dolby is a registered trademark of Dolby Laboratories
Licensing Corporation.
(2) AC-3 is a registered trademark of Dolby Laboratories
Licensing Corporation.