Acoustic efficiency

Abstract

A sound bypass device configured to transmit engine-generated sound pulses from an engine to an auditory environment whilst preventing the flow of gases to the auditory environment, the sound bypass device comprising: a chamber enclosing an internal volume between an inlet of the chamber and an outlet of the chamber, the inlet of the chamber being configured to receive gases exiting or entering the engine of the vehicle and the outlet of the chamber being configured to transmit sound pulses to the auditory environment; a first flexible membrane located within the chamber, the first flexible membrane being configured to transmit engine-generated sound pulses from the gases whilst preventing the movement of gases from the inlet of the chamber to the outlet of the chamber; a second flexible membrane that is separated from the first flexible membrane within the chamber; and a hollow spacer coupled to the first flexible membrane at a first end of the spacer and to the second flexible membrane at a second end of the spacer so as to separate the first flexible membrane from the second flexible membrane, the hollow spacer enabling the transmission of engine-generated sound pulses from the first membrane to the second membrane.

Dependencies are inferred from the claim text.