The most common are noted below. Retrieved January 26, The term high definition once described a series of television systems originating from August ; however, these systems were only high definition when compared to earlier systems that were based on mechanical systems with as few as 30 lines of resolution. This article has multiple issues. Archived from the original on In , the MUSE system was demonstrated for the first time in the United States, using the same aspect ratio as the Japanese system. List of digital television deployments by country.
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