Analysis and Re-Synthesis of directional Spatial Impulse Responses

Diploma thesis (pdf 3.405KB)

The focus of this work is to comprehend the acoustics in real rooms by a suitable measuring technique and analysis procedure. Room Responses are closely related with the perceived spatial impressions. Due to the fact that measuring and analyzing with only one single omni-directional microphone is insufficient to the greatest extent, a SoundfieldTM microphone is used in this case as a measuring instrument to capture the spatial impulse responses. The SoundfieldTM microphone is able to deliver a recording of the spatial impulse response in A-format and can be converted by matrixing in an Ambisonics B-format 1st order. Compared to other possible microphone setups, the recording with the SoundfieldTM microphone nearly covers the expected audio frequency range.

Based on the spatially distributed loudspeakers, existing Ambisonics Systems (IEM-CUBE & KUG MUMUTH) are examined within this work in regard to the directional spatial impulse responses. In the analysis phase the direction of arrival and reflections, plus the diffuseness of the spatial impulse response at frequency bands within time frames are determined. The ob-tained information is used in the synthesis phase for encoding in higher spatial order. It will also be shown, how different room acoustic properties can be transferred by the used descrip-tion basis.