The direction of an acoustic wave can be determined using a single microphone. The single microphone can be operatively positioned within an interior of a resonator. The resonator can include a body that includes an aperture, such as a slit, which allows communication between the interior and an exterior of the resonator. The resonator can be configured to rotate. The single microphone can be configured to acquire sound data of an incident acoustic wave. One or more processors can be operatively connected to the single microphone. The one or more processors can be configured to determine a direction of the incident acoustic wave based on the acquired sound data.