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Tap tested technology for DVRs

Posted: 03 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DVR design? board-level technology? input signal? ADC? data storage and compression?

Digital video recorder (DVR) designers have two options for storing video images digitally. They can develop the DVR, or they can rely on existing products. When designing a DVR, every aspect of the application's requirements must be considered. Input signal, data rate, physical storage media and file management are all important factors.

The DVR design process begins with the input signal. In the analog context, the input signal is probably S-Video, composite or component. So the first decision to be made is whether or not to change the signal itself by replacing the camera, or if converting the signal to digital format would be suitable. Given the capabilities, costs and image quality available today with most commercial ADCs, there are few instances where the input itself would need to be digital. Monolithic analog video decoders and encoders are available from several vendors, along with reference designs that neatly specify values for supporting discrete components.

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