BCM7041
SIMULTANEOUS DUAL-CHANNEL DIGITAL VIDEO/AUDIO ENCODER
Simultaneous dual-channel, single-chip, NTSC/PAL MPEG-2
encoding system
Dual channel MP@ML MPEG-2 video encoder
Variable resolutions:
Horizontal: 720, 704, 640, 544, 480, 360, 320, 160
Vertical: 480, 240, 112 (NTSC); 576, 288, 144 PAL
Variable frame rate, up to 30(NTSC)/25(PAL) fps
Supports constant/variable bit rates: 1 24 Mbps
Variable GOP length and structure: I, IP, IPB, IPBB
+/-100 pixels wide motion estimation search range
Automatic 3/2 pulldown detection
Video input; selectable 8/10 bits CCIR656
4:2:2 to 4:2:0 conversion
Dual-channel, high-fidelity 24/56 bits programmable audio
DSP
MPEG-1 layer II stereo encoding
Dolby Digital (AC-3) stereo encoding
Programmable frequencies and bit rates (64 384 Kbps)
Highly programmable system multiplexing processor
Ability to multiplex up to four inputs to one or two multiplexed
streams
CBR/VBR Program/Transport stream multiplexing
User data / VBI insertion
Programmable stream parameters
Dual-channel video pre-processing
7-tap vertical/horizontal luminance/chrominance filter
Accurate 27 MHz video/audio/PCR timestamps for exact video/
audio synchronization during playback
Dual-channel dedicated serial/parallel DVB transport stream
interface
Dual-channel I
2
S/AC-97 stereo audio inputs
PCI 32 bit/33 MHz, PCI DMA master or PCI slave and 16 bit
Generic Host interface
Integrated I
2
C controller
Package: 256-pin BGA
Supply voltage: 1.8/3.3V (5V compatible)
Power consumption: less than 1.5 W
System memory: SDRAM, 1 or 2 modules of 2Mx32
Fully integrated dual-channel MPEG-2 digital audio/video
encoder and audio/video multiplexer in a single chip
drastically reduces overall system and development costs.
Dual encoder enables simultaneous time shifting of one
channel and recording of another channel.
Video/audio elementary, video/audio packetized elementary,
program, and transport streams generated internally to the
BCM7041.
Broadcom fourth generation production/field-proven and in-
production technology.
Universal compatibility through standards compliance: Meets
key video encoding (ISO/IEC 13818-2), audio encoding (ISO/
IEC 11172-3, MPEG-1, Layer II and Dolby digital AC-3) and
system multiplexing (ISO/IEC 13818-1).
Broadcom-developed reference design kit includes application
board, sample application, and drivers based upon industry-
standard operating systems, enabling rapid and streamlined
software and hardware development, reducing time to market.
Simple system design: BCM7041 + 1 or 2 modules SDRAM.
Time shift/personal video recording (PVR):
Set-top box
Stand-alone PVR
Television set
DVD recorder
Digital VCR (VCR replacement)
PC TV tuner
Digital camcorder
Video transmission:
Video over IP
Video conferencing
Security and surveillance
F E A T U R E S
S U M M A R Y O F B E N E F I T S
A P P L I C A T I O N S
2M
x
32
2M
x
32
V
ideo
x
2
A
udio
x
2
BCM7041
Compressed
Data (DVB)
Output
PCI/Generic Interface
System Block
Diagram
O V E R V I E W
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
2004 by BROADCOM CORPORATION. All rights reserved.
7041-PB05-R
07/08/04
Broadcom
, the pulse logo, and Connecting everything
are trademarks of Broadcom Corporation and/
or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the
property of their respective owners.
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
2
C controller, dual
PCI/Generic bus interfaces, I
2
S/AC-97 audio input interfaces, and two
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.
I
2
S/AC-97 digital audio is delivered to the BCM7041 audio DSPs at a
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.
PCI/Generic
SDRAM Interface
Global
Controller
SDRAM
Controller
Video
Input
Buffer
Multiplexer
Motion
Estimator
Signal
Proc.
Core
RISC
Signal
Proc.
Audio
Proc.
Video
Bitstream
Proc.
Compressed
Video/Audio
Output
Stream
Video in
CCIR656
Audio in
I
2
S/AC97
BCM7041 Block Diagram
PDF 
ZIP