Real-time experimental research on the similarity of room acoustic paths for audio blind signal separation

The similarity of two room impulse responses (RIR) from a source to two sensors is defined and researched via a real-time room acoustic measurement system. The experimental results show that, the closer the two sensors are, the more similar the two RIRs are, and thus the fewer parameters are needed to describe the difference (DRIR) between the two RIRs. Aiming at reducing the computational complexity (CC) of audio blind signal separation (ABSS), a novel simplified mixing model is presented on a basis of the high similarity when the two sensors are very closely spaced (around 5 cm). As a result, the CC of ABSS is decreased considerably by using the DRIR instead of the two RIRs themselves. The real-time DSP experimental results demonstrate the effectiveness and feasibility of the model in ABSS applications.