Study of Generalized Phase Spectrum Time Delay Estimation Method for Source Positioning in Small Room Acoustic...

Area of Science:

• Acoustics
• Signal Processing
• Indoor Positioning

Background:

• Passive indoor positioning relies on time-delay estimation (TDE) to determine signal arrival times between microphones.
• Generalized cross-correlation (GCC) methods are widely used for TDE but can be computationally intensive.

Purpose of the Study:

• To investigate the application of generalized phase spectrum (GPS) TDE methods for passive indoor acoustic positioning.
• To propose and evaluate an algorithmic implementation of a GPS estimator in small room environments.

Main Methods:

• Utilized frequency-domain information for TDE, differing from time-domain GCC methods.
• Developed an algorithmic implementation of a GPS estimator.
• Studied frequency weighting options for TDE in a small room acoustic setting.

Main Results:

• GPS TDE methods offer a computationally less demanding alternative to GCC.
• The proposed GPS method reliably estimates time delays in small, acoustically dead rooms, even with moderate noise.
• GPS estimators showed reduced efficiency in less acoustically dead (more reverberant) environments.

Conclusions:

• GPS TDE is a viable and resource-efficient technique for passive indoor positioning in specific acoustic conditions (small, quiet rooms).
• The proposed GPS solution, utilizing limited adjusted bins, is suitable for locating moving narrow-band noise emitters with simple algorithms.
• Alternative TDE methods should be considered for more reverberant indoor spaces.