DVD Recorderの購入を考えているのですが、
VCRで録画して再生したときのようにクローズドキャプション
の効果は同じように得られるのでしょうか？また、それを
パソコンで再生してもキャプションは出るのでしょうか？

そもそもどういう仕組みでキャプションが出ているのか
分かっていません。VCRとは関係なく、テレビ側での機能
なのでしょうか？

For all types of NTSC programming, captions are "encoded" into Line 21 of the vertical blanking interval – a part of the TV picture that sits just above the visible portion and is usually unseen. For ATSC (digital television) programming, three streams are encoded in the video: two are backward compatible Line 21 captions, and the third is a set of up to 63 additional caption streams encoded in EIA-708 format.

NTSC DVDs may carry closed captions in the Line 21 format which are sent to the TV by the player and can be displayed with a TV’s built in decoder or a set-top decoder. Video DVDs may carry closed captions as a bitmap overlay (known as "subtitles") which can be turned on and off via the DVD player – as by selecting a subtitle track labeled either "English for the hearing impaired" or more recently, "SDH" (Subtitled for the Deaf and Hard of hearing). Both Line 21 and DVD bitmap subtitle formats can co-exist on the same DVD, providing two very different methods of displaying captions from the same DVD. On some DVDs, the captions may contain the same text, while on other DVDs, the Line 21 version contains more captions to cover non-speech information than the DVD bitmap subtitles. HD DVD and Blu-ray disc media cannot carry Line 21 closed captions. HD DVD can use either DVD bitmap subtitles (with extended definition) or ’advanced subtitles’ to carry SDH type subtitling. The latter being an XML based textual format which includes font, styling and positioning information as well as a unicode representation of the text. Advanced subtitling can also include additional media accessibility features such as descriptive audio.

　

レス1さん、情報ありがとうございます。
専門的なことはちょっと難しすぎて理解できなかった
のですが(^_^;)、キャプションが付いてくるというこ
とは分かったので良かったです。