manner of speaking,
delivery,
speech your characteristic style or manner of expressing yourself orally; "his manner of speaking was quite abrupt"; "her speech was barren of southernisms"; "I detected a slight accent in his speech"
modulation -
the act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect)
alteration,
revision the act of making something different (as e.g. the size of a garment)
Modulation is the process of varying one or more properties of a high frequency periodic waveform, called the carrier signal, with respect to a modulating signal. This is done in a similar fashion as a musician may modulate a tone (a periodic waveform) from a musical instrument by varying its volume, timing and pitch. The three key parameters of a periodic waveform are its amplitude ("volume"), its phase ("timing") and its frequency ("pitch"), all of which can be modified in accordance with a low frequency signal to obtain the modulated signal.
