What is the difference between DTV and HDTV?

Digital Television allows broadcasters to put more data into their signal. As an example, an analog signal requiring 6 megahertz (MHz) will require fewer MHz with digital television. As a result, a broadcaster could use the additional space gained by digital transmission to transmit four simultaneous signals in standard definition (SDTV).

High definition adheres to a standard of digital television transmission denoting that the sound and images are of a higher quality, taking advantage of the additional bandwidth. Digital broadcasters are not required to broadcast in this enhanced standard, but it is likely that many will broadcast in HDTV. Remember that all HDTV is broadcast in DTV, but not all DTV is HDTV.

HDTV is high-definition television, a television picture format made possible by digital broadcasting. HDTV offers viewers high-quality pictures and Dolby Digital surround sound. HDTV uses the same amount of bandwidth (6 megahertz) as used in the current analog system, but HDTV ...

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