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Media bridges dispatch transfer via integrated apps

Posted: 09 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:video? surveillance? digital? recording?

Conexant Systems Inc. recently presented two media bridges targeted at PC-based video surveillance products with digital video recording (DVR) capabilities. The CX25820 and CX25821 enable multichannel, bidirectional uncompressed digital audio and video transfers to a host computer for preview, processing or compression via an integrated PCIe interface.

The new media bridges can be used with the company's CX25853 video decoder to form a complete eight-channel, industry-standard "D1" digital video solution for real-time video surveillance DVR applications. "In addition, the combination of these highly integrated devices allows product developers to reduce the previously required number of components from nine to two devices," Conexant said.

The CX25820 and CX25821 are based on a flexible architecture, and are offered with integrated bidirectional video and audio interfaces. The devices can bridge multiple ITU-R BT.656/VIP2.0 video and I2S Inter-IC Sound audio streams over PCIe simultaneously. For transfers originating at the host, the video interfaces can be configured in a "data-pump" mode that allows generic 8bit or 16bit data to be transferred to the add-in card. The devices can also be configured to interface with certain advanced H.264 video compression codecs, which allow compressed data to be transferred from add-in cards to the host processor.

Key video surveillance-specific features include programmable logic, which can be used to detect motion on incoming, industry-standard BT.656/VIP2.0 video streams. When this occurs, an alert is immediately sent to the host processor via the PCIe bus. The CX25820/1 media bridges also have the ability to downscale digital video from 4:2:2 format to 4:1:1, reducing the bandwidth from 16bit/pix to 12bit/pix. This increases the number of uncompressed video streams that can be sent over the PCIe bus.

- Gina Roos

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