exciter

noun

1. One who or that which excites.

   “It imparts a sweetness to the breath, is a valuable medicine in all nervous complaints, and is esteemed as a prolonger of life and an exciter of venery.”

2. The electronic oscillator that generates the carrier signal for a transmitter.
3. An audio signal processing technique used to enhance a signal by dynamic equalization, phase manipulation, harmonic synthesis of (usually) high frequency signals, and through the addition of subtle harmonic distortion.