Compact acoustic mirror array system and method

摘要

A microphoning assembly having a plurality of individual, sound directing, substantially parabolic structures are adjacently arranged to form a single structured acoustic, hemispherically directed array. The parabolic structures' absorption factor is less than 0.3. MEMS microphones of less than 2 mm in size are situated at each focus to pick up sound reflected from the parabolic structures, wherein a 10 dB gain is experienced. A microprocessor, a signal conditioning module, and an analog-to-digital converter is embedded in the array. The microprocessor contains instructions to perform a statistical analysis of among random variables to automatically separate sound sources received by the microphones and automatically determine a distance and direction of a source of the incoming sound.

主权项

1. A microphoning assembly, comprising:
a plurality of individual sound directing substantially parabolic structures adjacently arranged to form a single structured, hemispherically directed acoustic array, each parabolic structure having an acoustic focus and composed of a material with an absorption factor of approximately less than 0.3 for frequencies of interest, the parabolic structures directing a wave front of incoming sound to its focus; a plurality of MEMS microphones of less than approximately 2 mm in size, each situated proximate to each focus to pick up sound reflected from the parabolic structures, wherein an increase of at least 10 dB is experienced at each microphone as compared to non-directed sound; and a microprocessor a signal conditioning module and an analog-to-digital converter embedded in the array, receiving output from the plurality of microphones, the microprocessor containing instructions to perform a statistical analysis of among random variables to automatically separate sound sources received by the microphones and automatically determine a distance and direction of a source of the incoming sound.