I get quite a few questions about the best HD converter box out there. The reality is, there is no such thing as an HD converter box. What I believe most folks are asking about are , which allow the reception of HD signals. Digital converter boxes capture standard and high definition signals and convert them to analog for non-digital TVs — although if your TV is not HD you won’t be able to view the HD signals.
Could there be such a thing as an HD converter box? Sure, there are all kinds of converter boxes to convert various video and audio signals. And, it depends on whether you are talking about converting up to HD or converting down from HD. For example, there are converters that will take your HD signal and convert down to SDI or composite, although I’m not sure why anyone would have a use for that except maybe in commercial applications.