Sound-field measurement with moving microphones

Area of Science:

• Acoustics
• Signal Processing
• Computational Physics

Background:

• Reverberation in closed rooms degrades audio system performance.
• Accurate sound field knowledge is crucial for compensating room effects.
• Traditional spatial sound field sampling is complex and requires many microphones.

Purpose of the Study:

• To develop an efficient method for measuring sound fields.
• To reconstruct room impulse responses (RIRs) on a regular grid.
• To reduce hardware requirements and measurement time for sound field acquisition.

Main Methods:

• Utilizing moving microphones to capture spatial sound field data.
• Applying spatial interpolation to relate measurements along trajectories to grid positions.
• Employing perfect sequences for excitation and multigrid recovery.
• Exploring compressed sensing for reconstruction.

Main Results:

• A customizable number of microphones allows for hardware-software trade-offs.
• The method enables reconstruction of RIRs on a regular grid from sparse measurements.
• Demonstrates feasibility of sound field measurement with reduced spatial sampling.

Conclusions:

• Moving microphones offer a practical solution for sound field measurement.
• The proposed method enhances efficiency and reduces complexity in acquiring RIRs.
• This technique has significant implications for improving audio reproduction and teleconferencing systems.