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Definition of "HD down Converter" |
High-Definition downconverter is a device that converts high-definition television video to standard-definition video that can be viewed on conventional television receivers or computer monitors, or recorded on DVD. A high-end HD downconverter performs these functions with a minimum of blurring, aliasing, and conversion noise, and can provide output at a variety of refresh rate and aspect ratio. / Zero-drift amplifier dynamically correct their offset voltage and reshape their noise density. Two commonly used types auto-zero amplifiers and choppers achieve nanovolt-level offsets and extremely low offset drifts due to time and temperature. The amplifier's 1/f noise is also seen as a dc error, so it is removed as well. Zero-drift amplifiers provide many benefits to designers, as temperature drift and 1/f noise, always nuisances in the system, are otherwise very difficult to eliminate. In addition, zero-drift amplifiers have higher open-loop gain, power-supply rejection, and common-mode rejection as compared to standard amplifiers; and their overall output error is less than that obtained by a standard precision amplifier in the same configuration. |
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