Joint Wideband Source Localization and Acquisition Based on a Grid-Shift Approach

This paper addresses the problem of joint wideband localization
and acquisition of acoustic sources. The source locations as well
as acquisition of the original source signals are obtained in a joint
fashion by solving a sparse recovery problem. Spatial sparsity is
enforced by discretizing the acoustic scene into a grid of predefined
dimensions. In practice, energy leakage from the source location to
the neighboring grid points is expected to produce spurious location
estimates, since the source location will not coincide with one of the
grid points. To alleviate this problem we introduce the concept of
grid-shift. A particular source is then near a point on the grid in at
least one of a set of shifted grids. For the selected grid, other sources
will generally not be on a grid point, but their energy is distributed
over many points. A large number of experiments on real speech
signals show the localization and acquisition effectiveness of the
proposed approach under clean, noisy and reverberant conditions

• Speech Processing

• Machine Perception