Following is a summary of high-definition (HD) digital video formats, which provide 720 or 1080 lines of resolution. In the past, high-definition analog TV systems were developed; however ...

which is why the HD in HD Radio stands for "hybrid digital," not "high definition." HD Radios tune into the station's analog signal first and then look for a digital signal. The European DRM ...

HD Radio allows conventional (or terrestrial) AM and FM stations to broadcast their content over digital signals. Appropriating an abbreviation from high-definition TV, HD Radio offers better ...