Acoustic system and in-vehicle communication support system

An acoustic system including a parametric loudspeaker configured to emit an ultrasonic wave modulated with an audible sound as an emitted sound wave, the acoustic system comprising:

• an audible sound collector to which the emitted sound wave emitted by the parametric loudspeaker becomes incident,
• wherein the audible sound collector includes:
• a reflector having a reflecting surface configured to reflect a sound wave that becomes incident thereto in a same direction as a direction in which the emitted sound wave becomes incident thereto;
• and
• a sound absorber,
• wherein the sound absorber is positioned closer to a side from which the emitted sound wave becomes incident than the reflecting surface of the reflector is, and is configured to attenuate an ultrasonic wave component of the emitted sound wave reaching the reflecting surface, and
• wherein the reflecting surface of the reflector reflects an audible sound component that is self-demodulated by the emitted sound wave and becomes incident to the audible sound collector, to cause the audible sound component to be collected at a predetermined sound collection position.