mod·u·la·tion /ˌmɑʤəˈleʃən/
  調音,調節,抑揚
  mod·u·la·tion /ˌmɑʤəˈleʃən/ 名詞
  modulation
  調變;調制
  modulation
  寬( 頻 )帶調頻	WBFM
  modulation
  調變
  Mod·u·la·tion n.
  1. The act of modulating, or the state of being modulated; as, the modulation of the voice.
  2. Sound modulated; melody. [R.]
  3. Mus. A change of key, whether transient, or until the music becomes established in the new key; a shifting of the tonality of a piece, so that the harmonies all center upon a new keynote or tonic; the art of transition out of the original key into one nearly related, and so on, it may be, by successive changes, into a key quite remote. There are also sudden and unprepared modulations.
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  modulation
       n 1: a musical passage moving from one key to another [syn: transition]
       2: (electronics) the transmission of a signal by using it to
          vary a carrier wave; changing the carrier's amplitude or
          frequency or phase
       3: rise and fall of the voice pitch [syn: intonation, pitch
          contour]
       4: a manner of speaking in which the loudness or pitch or tone
          of the voice is modified [syn: inflection]
       5: the act of modifying or adjusting according to due measure
          and proportion (as with regard to artistic effect)