Sample interview questions: Describe the various methods used for sound source localization in complex environments.
Sample answer:
Beamforming
- Uses an array of microphones to estimate the direction of arrival (DOA) of sound waves.
- Calculates the time difference of arrival (TDOA) or phase difference between signals received by different microphones.
- Exploits spatial filtering to suppress noise and enhance the signal from the desired source.
Time-of-Flight (TOF) Estimation
- Measures the travel time of sound waves between a known source and multiple receivers.
- Uses the TOF measurements to calculate the distance between the source and each receiver.
- Triangulates the source location based on the distances.
Cross-Correlation
- Compares the waveforms received by multiple microphones to identify time shifts and cross-correlations.
- The time shift corresponds to the TDOA or phase difference between signals, providing information about the source direction.
Time Reversal
- Transmits a time-reversed version of the received signal back to the environment.
- The time-reversed waves focus on the source location, creatin… Read full answer
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