Investigation of effectiveness of microphone arrays for in car use based on sound field simulation
V. B. Galanenko, A. Kalyuzhny, A. Kovtonyuk · 2002
The effectiveness of small microphone arrays for in car use is investigated. These arrays are designed for speech enhancing in a noise background within the cabin of a moving car. Speech and noise simulation based on a designed mathematical algorithm of sound field modeling within a car cavity is applied for predicting the effectiveness of the spatial-time processing algorithms. The mathematical model takes into account complicated cabin geometry, the difference of sizes in the wavelength scale at low and high frequencies, frequency dependent sound absorption of the cabin surfaces and distributed noise sources with their cross correlation. Theoretical estimates of the microphone array effectiveness and output simulated signals (for subjective estimation) are presented.