Product category:
Microprocessors, Microcontrollers and DSPs
News Release from: Ambarella | Subject: A350 and A380
Edited by the Electronicstalk Editorial
Team on 08 January 2008
SoC enables top resolution in camcorders
The Ambarella A3 platform has low operating power and increased system integration that makes the high-definition experience a reality for mainstream consumers.
Ambarella has announced its third-generation low-power A3 SoC, which is aimed at high-definition (HD) camcorders using H.264/AVC compression technology The SoC comes in two versions: the A350 supports the 1080i 60 interlaced HD standard; and the A380 supports the emerging 1080p60 progressive video format
This article was originally published on Electronicstalk on 29 Jan 2008 at 8.00am (UK)
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The A3 HD system-on-chip enables the development of full high-resolution camcorders at the highest image quality with smooth 60 frame-per-second video.
Ambarella's A3 is the first single-chip H.264 codec capable of encoding full 1080p60 at 1920 pixels per line resolution.
In addition, A3 integrates a high-performance image processing pipeline with high speed signal acquisition, still image compression, audio compression and all key system functions.
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The Ambarella A3 platform has low operating power and increased system integration that makes the high-definition experience a reality for mainstream consumers.
The A3 platform is based on the H.264/AVC video compression standard, which is the next generation of video compression technology.
Ambarella's patent-pending platform delivers a 2.5x compression gain over existing MPEG-2/4 solutions, providing the efficiency required to store HD video content in convenient Flash-based memory, hard disk drive or recordable DVD.
The Ambarella platform programmability enables implementation of multiple formats for HD video such as the AVCHD specification for 1080i HD camcorders as well as many formats commonly used on PC platforms.
In a recent survey more than 90% of the TV's sold in Japan, 88% of the TVs sold in the EU, and 76% of the TV's sold in North America were flat progressive TVs.
All of these displays are progressive in nature with a refresh rate at 50Hz (EU) or 60Hz (North America and Japan).
Among these TVs, the large majority of the devices with screens larger than 36in have a "full HD" configuration and can display a raster of 1920x1080.
The 1080p60 standard has become the de facto HD display format.
Because the CMOS sensors used in HD camcorder are also progressive devices it is only natural that camcorders adopt the same format as sensors and TVs.
The advantage of progressive formats are evident in three different aspects.
First, they have twice the resolution, and so can carry more details.
Secondly, they do not suffer from motion-induced interlaced artefacts, which are particular noticeable on a large TV.
And, thirdly, they offer greater ease of editing: video editors would rather avoid the field/frame distinction where two halves of a full frame are acquired at different instants in time.
Although a progressive 60p format has twice the datarate (about 3Gbit/s) of the equivalent interlaced video, the signal exhibits much stronger vertical correlation, and so compresses more easily to about 1.2x more bits that the progressive one.
This means that twice the vertical resolution can be obtained for only a small 20% additional bandwidth or storage capacity.
The A380 SoC allows consumers to record as much as one hour of 1080p60 video on a 4Gbyte Flash card.
Because of the dominance of television sets capable of 1920x1980 60p, the industry has adopted an interface (and a connector) HDMI which supports 1080p 60.
This allows DVD players, cable/satellite set-top boxes and now camcorders to deliver data at the full resolution of the TV.
Ambarella's A3 platform has a built-in HDMI interface, including support for1080p60 signals.
Depending on the amount of light available, imaging sensors have a substantial amount of noise, so filtering this noise is a very important task.
The challenge of a full resolution HD camcorder is to reduce the noise without causing a loss of resolution or a loss of detail and spatiotemporal (3D) filters must be used.
Most of the solutions available are motion adaptive and switch from a predominantly temporal to a predominantly spatial filter based on detecting the presence of motion.
Ambarella's A3 solution is motion compensated instead of just motion adaptive and truly tracks the motion and uses motion compensation in the filter.
"The combination of a high performance image pipeline, motion compensated 3D noise reduction and a 1080p60 H.264 AVC codec allows us to redefine the HD camcorder", says Dr Fermi Wang, Ambarella CEO.
"The A3 platform is a key component in our product strategy".
The Ambarella A3 platform is a solution supporting both the 1080i format (A350) and 1080p (A380) as well as hybrid cameras.
The A3 platform is available in multiple configurations for differing requirements.
Evaluation kits are available now from Ambarella.
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