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Techwell video decoder integrates audio ADCs

Posted: 31 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:TW2815? TW2816? video decoder? Techwell?

Techwell's security surveillance ICs

Techwell Inc. introduced three additions to its line of ICs for security surveillance applications. The TW2815 and TW2816 four-channel video decoders convert analog composite video signals to digital component YCbCR data for standalone and PC-based DVR security applications.

The video decoders include four integrated analog anti-aliasing filters, 10bit CMOS ADCs and adaptive 4H comb filters for all NTSC/PAL standards. Both ICs provide simultaneous four-channel Full D1 and CIF time-multiplexed outputs with 54MHz, and both operate at typically 480mW to 500mW.

"The TW815 integrates four video decoders as well as four audio ADCs and audio DAC into one chip," said Tom Krause, director of business development at Techwell. "It is a complete, all-in-one, front-end solution for any security surveillance system, whether it's a DVR, a network video recorder, a multiplexer, what have you."

According to Krause, the TW815 has two ADCs per channel: one is the 4H comb video decoder, and the other one is called the decimation filter. "You basically have eight ADCs. These are combined into four outputs per video, which is the BT656. The audio is combined into one I2S output. Effectively, you have four 6-by-6 video outputs and one multiplexer combined audio output for four channels, all in one chip," Krause said.

The TW2700 is a real-time, four-channel video compression controller that can compress and decompress four full-size video data streams simultaneously. Features include four ITU-R BT.656 compatible video input ports; an independent compression engine for each channel with a proprietary algorithm; support for Triplex operations, simultaneous recording, playback and network connection; and support for up to 16 channels through cascade mode.

An increased focus on security and declining system prices are driving increased demand for security surveillance systems. According to J.P. Freeman, the worldwide video surveillance market is expected to grow from $7.8 billion in 2004 to $18.3 billion in 2009, representing a compound annual growth rate of 18 percent.

"We see very strong growth in all of our end-market segments. We're quite excited about surveillancethere's a number of really interesting trends driving that market. One is the heightened focus on security, but also there's a significant move to replace existing VCR tape-based systems with newer hard disk drive-based systems," observed Krause.

The products use a 100-pin TQFP package, are currently sampling and will go into mass production in Q2 2006. The TW2700, which uses a 256-pin PQFP package, will begin sampling in Q2 2006 and go into mass production in Q3 2006.

- Michael Martin Lea?o
Electronics Engineering Times- Asia

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