Video Enhancer Circuit with TDA9181 Comb Filter

The device has S-video, Composite video outputs on the supply voltage AC 9 volt regulated circuit. Video Image Quality Enhancer and Y-C Splitter Sharpen pictures from your videotapes with this great circuit. When transferring your tapes to DVDs, it converts composite video to S-Video to ensure only capture and high-quality transmission.

Video signals from an analog VCR are extremely limited not only in composite video form but also in luminance (Y) bandwidth due to the limitations of VHS recording. In fact, the luminance bandwidth is typically no more than about 3MHz; this corresponds to a horizontal resolution of approximately 240 lines.

This is only half the brightness bandwidth and resolution capability of DVD video discs. These can usually provide a brightness bandwidth of about 6.4 MHz, or just 500 lines of resolution.

As a result, you may get better results when transferring video from a VCR to DVD via your PC by applying some reasonable video enhancements or “sharpening” them. It’s true that this tends to lower the video signal-to-noise ratio, but many find that the overall picture quality is improved, provided the sharpening is not exceeded.

TDA9181 Video Enhancer Circuit

Source: http://www.siliconchip.com.au/cms/A_102173/article.html

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