n. 调制, 调节, 语调

[计] 调制

[医] 调整, 适应, 调制

[经] 调整, 调节

Modulation \Mod`u*la"tion\, n. [L. modulatio: cf. F.
modulation.]
1. The act of modulating, or the state of being modulated;
as, the modulation of the voice.

2. Sound modulated; melody. [R.] --Thomson.

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.

4. (Electronics) The alteration of hte amplitude, intensity,
frequency, or phase (of the carrier wave of a radio
signal) at intervals, so as to represent information to be
transmitted.
[WordNet 1.5]