ABSTRACT We present a comparison of the measured and theoretical performance of a 24 microphone baffled circular microphone array. The signal-to-noise ratio of the circular microphone array is obtained by analysing the spatial aliasing error, the microphone placement error, and the white noise gain. The circular microphone array has a frequency range of operation from 50 Hz to 16 kHz, and we sh...

The research product ...............................................................................................................................1
 Deformable mirrors: current state-of-the-art...........................................................................................2
 AO and MEMS DMs: relevance to astronomy and space science......................................................

This paper presents a general method for the integration of distributed microphone arrays for localization of a sound source. The recently proposed sound localization technique, known as SRP-PHAT, is shown to be a special case of themore general microphone array integrationmechanism presented here. The proposed technique utilizes spatial likelihood functions (SLFs) produced by each microphone a...

A miniature differential microphone is described having a low-noise floor. The sensitivity of a differential microphone suffers as the distance between the two pressure sensing locations decreases, resulting in an increase in the input sound pressure-referred noise floor. In the microphone described here, both the diaphragm thermal noise and the electronic noise are minimized by a combination o...

In far-field speech recognition systems, training acoustic models with alignments generated from parallel close-talk microphone data provides significant improvements. However it is not practical to assume the availability of large corpora of parallel close-talk microphone data, for training. In this paper we explore methods to reduce the performance gap between far-field ASR systems trained wi...

This paper presents a numerical approach that projects frequency-dependent directivity patterns of classic recording microphones onto steerable beams created with a spherical microphone array. In an anechoic chamber, the spatial and timbral characteristics of a legacy recording microphone and the characteristics of a 120-channel spherical microphone array were measured. Using a least-square mat...

S.Z. cantilevers are made using a simple one-mask fabrication process with.characterization of a cantilever-type MEMS chemical sensor for detection of chemicals. MEMS has been with the advancement of cantilever-type sensors.sensor. The mechanical structure is a cantilever, having its own resonant frequency. MEMS cantilevers can be as thin as a few nanometers with lengths.Cantilever-based Sensor...