1. A method comprising: receiving, by a device that includes one or more processors, an input indicative of acoustic feature parameters associated with speech; determining, based on the acoustic feature parameters, a modulated noise representation for noise pertaining to one or more of an aspirate or a fricative in the speech, wherein the aspirate is associated with a characteristic of an exhalation of at least a threshold amount of breath, and wherein the fricative is associated with a characteristic of airflow between two or more vocal tract articulators; and providing, by the device, an audio signal indicative of a synthetic audio pronunciation of the speech based on the modulated noise representation.