BCM7041 Broadcom Corporation, BCM7041 Datasheet - Page 2

• Manufacturer Part Number: BCM7041
• Description: SIMULTANEOUS DUAL-CHANNEL DIGITAL VIDEO/AUDIO ENCODER
• Manufacturer: Broadcom Corporation

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Broadcom
or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the
property of their respective owners.
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2004 by BROADCOM CORPORATION. All rights reserved.
7041-PB05-R
The BCM7041 is a highly integrated dual-channel, single-chip NTSC/
PAL MPEG-2 encoder system. Integrated features in the BCM7041
include two MPEG-2 video encoders, two high-fidelity audio encoder
DSPs supporting both MPEG-1 layer II and Dolby digital AC-3
encoding and an adaptable system multiplexer capable of generating one
or two MPEG-2 program and transport streams. In addition, the
BCM7041 integrates video pre-filtering modules, I
PCI/Generic bus interfaces, I
dedicated compressed data/DVB interfaces.
CCIR-656 digital video is delivered to the BCM7041 video input and
pre-filtering units. The digital video is filtered, optionally decimated
from Full D1 to lower resolutions, and passed to the video encoders.
The video encoders support bit rates of 1 Mbps up to 24 Mbps. The ±100
pixels motion estimation, in combination with sophisticated scene
complexity analysis algorithms, variably change the bit rate to ensure the
best possible video quality even in low video bit rates. Also supported
are 3/2 pull down detection, variable GOP structure, and VBI insertion.
®
, the pulse logo, and Connecting everything
07/08/04
CCIR656
Video in
2
S/AC-97 audio input interfaces, and two
®
Buffer
Video
Input
®
are trademarks of Broadcom Corporation and/
Estimator
PCI/Generic
Motion
2
C controller, dual
BCM7041 Block Diagram
Controller
Global
Signal
Proc.
Core
O V E R V I E W
Signal
RISC
Proc.
Controller
SDRAM
I
frequency of 32/44.1/48 KHz. The high-quality, 24/56-bit, fixed-point
DSP encodes the audio either in MPEG-1 layer II or in Dolby AC-3
format. The MPEG implementation supports bit rates of 64 kbps - 384
kbps. The AC-3 implementation conforms to the Dolby consumer class
A encoder, including support for bit rates of 64 kbps - 448 kbps, and
dynamic range compression.
The two compressed video streams and two compressed audio streams
are delivered to a highly programmable multiplexing unit. The
multiplexer combines the video and audio streams in the MPEG-2
program or MPEG-2 transport format. The multiplexer can output two
multiplexed streams, each containing one video stream and one audio
stream, or one multiplexed stream containing all the four input streams.
Various multiplexer parameters are configurable, including SID, PID,
and user-defined PAT/PMT/SDT tables. In addition, multiplexing of
external user data into the transport stream is supported. The compressed
stream is delivered either to a dedicated DVB interface or to the PCI/
generic host interface.
2
S/AC-97 digital audio is delivered to the BCM7041 audio DSPs at a
SDRAM Interface
I
Audio in
2
Audio
Proc.
S/AC97
Bitstream
Video
Proc.
Multiplexer
Compressed
Video/Audio
Output
Stream
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Fax: [phone]
E-mail: [e-mail]
Web: www.broadcom.com