Title :
Adaptive noise cancellation with directional microphones
Author_Institution :
Dept. of Acoust. Res., AT&T Bell Labs., Murray Hill, NJ, USA
Abstract :
The spatial correlation function between directional microphones is useful in the design and analysis of the performance of these microphones in actual acoustic noise fields. These correlation functions are well known for omnidirectional receivers, but not well known for directional receivers. This paper investigates the spatial correlation functions for Nth-order differential microphones in spherically isotropic noise fields. The results are used to calculate the amount of achievable cancellation from an adaptive noise cancellation application using combinations of differential microphones to remove unwanted noise from a desired signal. The results are also useful in determining signal-to-noise ratio gains from arbitrarily positioned differential microphone elements in microphone array applications
Keywords :
acoustic correlation; acoustic field; acoustic noise; acoustic receivers; acoustic transducer arrays; adaptive signal processing; interference suppression; microphones; Nth-order differential microphones; acoustic noise fields; adaptive noise cancellation; design; directional microphones; microphone array applications; performance; signal-to-noise ratio gains; spatial correlation function; spherically isotropic noise fields; Acoustic noise; Adaptive systems; Coherence; Microphone arrays; Noise cancellation; Noise figure; Noise measurement; Signal to noise ratio; Wiener filter; Working environment noise;
Conference_Titel :
Applications of Signal Processing to Audio and Acoustics, 1997. 1997 IEEE ASSP Workshop on
Conference_Location :
New Paltz, NY
Print_ISBN :
0-7803-3908-8
DOI :
10.1109/ASPAA.1997.625628
