NASA Technical Reports Server (NTRS) 20150023472: Removing Background Noise With Phased Array Signal Processing - Info and Reading Options
By NASA Technical Reports Server (NTRS)
"NASA Technical Reports Server (NTRS) 20150023472: Removing Background Noise With Phased Array Signal Processing" and the language of the book is English.
“NASA Technical Reports Server (NTRS) 20150023472: Removing Background Noise With Phased Array Signal Processing” Metadata:
- Title: ➤ NASA Technical Reports Server (NTRS) 20150023472: Removing Background Noise With Phased Array Signal Processing
- Author: ➤ NASA Technical Reports Server (NTRS)
- Language: English
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- Internet Archive ID: NASA_NTRS_Archive_20150023472
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"NASA Technical Reports Server (NTRS) 20150023472: Removing Background Noise With Phased Array Signal Processing" Description:
The Internet Archive:
Preliminary results are presented from a test conducted to determine how well microphone phased array processing software could pull an acoustic signal out of background noise. The array consisted of 24 microphones in an aerodynamic fairing designed to be mounted in-flow. The processing was conducted using Functional Beam forming software developed by Optinav combined with cross spectral matrix subtraction. The test was conducted in the free-jet of the Nozzle Acoustic Test Rig at NASA GRC. The background noise was produced by the interaction of the free-jet flow with the solid surfaces in the flow. The acoustic signals were produced by acoustic drivers. The results show that the phased array processing was able to pull the acoustic signal out of the background noise provided the signal was no more than 20 dB below the background noise level measured using a conventional single microphone equipped with an aerodynamic forebody.
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