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A televisão de definição padrão (em inglês standard-definition television, sigla SDTV), refere-se a sistemas televisivos que tenham uma resolução de imagem que alcance certos padrões mas não sejam considerados EDTV (TV de definição aprimorada) ou HDTV (TV de alta definição).
Standard-definition television (SDTV; also standard definition or SD) is a television system that uses a resolution that is not considered to be either high or enhanced definition. Standard refers to offering a similar resolution to the analog broadcast systems used when it was introduced.
Ver artigo principal: História do Sistema Brasileiro de Televisão. A primeira transmissão oficial do SBT foi no dia 19 de agosto de 1981, às 9h30, exibindo ao vivo a cerimônia de assinatura do contrato de concessão direto de Brasília.
Standard-Definition Television is a kind of television system that provides lower resolution than HDTV and higher resolution than analog TV does. The word 'SDTV' is generally used at the digital television broadcasting system that has a similar or litle bit higher state of resolution to the 'analog television system'.
The term has been used since at least 1933; in more recent times, it refers to the generation following standard-definition television (SDTV). It is currently the standard video format used in most broadcasts: terrestrial broadcast television, cable television, satellite television.
SDTV resolution by nation; countries using 576i are in blue. 576i is a standard-definition digital video mode, originally used for digitizing analogue television in most countries of the world where the utility frequency for electric power distribution is 50 Hz.
SDTV（Standard definition television、標準解像度テレビ）とは現在のデジタルテレビ放送の解像度に対して、主にアナログカラーテレビ放送で使用された解像度に近いものを指す。
