Simulation of sound source motion by time-frequency filtering
The generalisation of conventional linear time invariant filter theory from one dimension to the two-dimensional timefrequency (TF) domain provides a powerful tool for the simulation of complex time variable systems. TF filtering is performed as convolution in the TF domain and is based on nonparametric modelling using direct convolution along the time or frequency axis. A method based on short-time Fourier analysis has been developed to produce non-stationary signals with desirable time and frequency characteristics. This method is faster than non-recursive realisations and yields a simple synthesis procedure. The application of filtering in the TF domain for the simulation of sound source motion is presented.