Simultaneous Measurement of Spatial Room Impulse Responses from Multiple Sound Sources Using a Continuously Moving Microphone

Continuous measurement techniques aim at identifying a large number of impulse responses from a signal captured by a moving microphone. In a recently proposed method, each sample of the captured signal is interpreted as a spatio-temporal sample of the sound field, and the individual impulse responses are computed by means of spatial interpolation. In the present study, the approach is extended towards multichannel cases. The superimposed sound field reproduced by multiple sources is recorded with one microphone, and the individual impulse responses are identified. To this end, the sound sources are excited with the same periodic perfect sequence, but a different amount of temporal shift is applied so that the identified impulse responses of different sources do not overlap. An anti-aliasing condition for the microphone speed is derived which is computed based on the spatial bandwidth of the sound field.