Implementation of 3D Audio Acoustic Modeling for Real Time Application using Blackfin Processor

Signal processing techniques allow us not only to compensate for the acoustics of a listening environment, but also to add special musical effects such as delay, echo, and reverb, if desired. The most common example is the audio equalizer that allows us to enhance the bass or treble content of an audio signal. What a listener hears in a room depends not only on the acoustics characteristics of that room, but also on the location of the listener. In any listening space, an audio source consists not only of the direct sound, but also early echoes reflected directly from the walls and other structure, and a late sound or reverberation that describes multiple reflections (that get added to other echoes). The direct sound provides clues to the location of the source, the early echoes provides an indication of the physical size of the listening space, and the reverberation characteristics the warmth and liveliness that we usually associate with sounds. The amplitude of the echoes and reverberation decays exponentially with time. Room reverberation can be simulated with a set of IIR filters. An artificially add these reverberation effects to the music and make it sound richer.