Methods and systems for Doppler recognition aided method (DREAM) for source localization and separation

摘要

Systems and methods are provided for source localization and separation by sampling a large scale microphone array asynchronously to simulate a smaller size but moving microphone array. Signals that arrive from different angles at the array are shifted differently in their frequency content. The sources are separated by evaluating correlated and even equal frequency content. Compressive sampling enables the utilization of extremely large scale microphone arrays by reducing the computational effort orders of magnitude in comparison to standard synchronous sampling approaches. Processor based systems to perform the source separation methods are also provided.

主权项

1. A method to separate a plurality of concurrently transmitting real acoustical sources, comprising:
receiving acoustical signals transmitted by the concurrently transmitting real acoustical sources by a linear microphone array with a plurality of non-rotating real microphones with the plurality of microphones being in a fixed position; sampling by a processor at a first moment, signals generated by a first number of microphones in a first position in the linear microphone array at a first sampling frequency, the first number being smaller than a total number of microphones in the plurality of microphones; sampling by the processor at a second moment following the first moment at the first sampling frequency, signals generated by a second number of microphones in a second position in the linear microphone array equal in number to the first number of microphones, wherein the first sampling frequency is based on a first virtual speed of the first number of microphones that is determined by a distance between the first and second position and a time difference between the first and second moment, wherein the first and second number of microphones are sampled asynchronously; and the processor determining a Doppler shift from the sampled signals to separate a direction of a first real acoustical source from a second real acoustical source in the plurality of concurrently transmitting real acoustical sources relative to the linear microphone array based on the first virtual speed of the first number of microphones.