An Improvement to Extracting and Modifying the Spatial Information in Audio

Abstract

In this paper, the method to extract the spatial in- formation and sound sources from the received signal is proposed. The Cross-power Spectrum Phase (CSP) is used to nd the arrival time delay from sources to microphone. If two microphones are considered to locate at two foci, then the trajectory of the di erence of time delay found by microphone pair is a hyperbola. Treating a source location is a kind of projection. All of hyperbo- las produced by microphone pairs have been collected. Therefore, the back-projection method could be used to reconstruct the source location. After all of the source locations is known, the sound projection is used to ex- tract the sources one by one according the the spatial information. Finally, a sound eld would be synthe- sized. The result of the simulation veri es that the syn- thesized sound eld similar to original ones is synthe- sized. Furthermore, a new sound eld could also be synthesized according to the spatial information with requirement.