Subject: Devices for recording and impulse response measurements: revised version (UNCLASSIFIED) From: "Scharine, Angelique (Civ,ARL/HRED)" <AScharine@xxxxxxxx> Date: Fri, 2 Nov 2007 15:13:38 -0400 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Classification: UNCLASSIFIED Caveats: NONE I've gotten several very helpful suggestions - but so far, I'm only clearer on what we need - not necessarily on what to get! I'm hoping that if I clarify and revise my original request for suggestions, that some of the suggestions will be nearer to what we need. We're looking for a portable system or two portable systems to do the following tasks: 1. Record sounds in the environment, including weaponfire at levels of approximately 145 dB SPL (peak), and do real-time analysis, including measurement of various kinds of SPLS. 2. Record (binaural) impulse responses, mostly for the creation of virtual environments, but also for characterization of research laboratories, etc. We have quality microphones, loudspeakers and amps that should suffice in most cases, although specific considerations and suggestions are welcome. What we are really looking for is a user friendly software package that does the real-time analysis and recording and an external sound card to use with a laptop. Ideally, this system could be calibrated so that the software gives absolute values - but this isn't essential. Our current system does allow for this. However, when used for recording of very loud sounds, there seems to be no way to turn the autorange feature off, which means that the resulting recordings are severely clipped. We've gotten some good suggestions for the room acoustics features described in #2, but I'd like to be sure that we cannot get a single system that will do both tasks before proceeding. Thanks again for the useful suggestions! Angelique They laughed when I said I was going to be a comedian. They're not laughing now. -Bob Monkhouse, comedian (1928-2003) Angelique Scharine PhD Army Research Lab - HRED AMSRD-ARL-HR-SD APG, MD 21005-5425 (410) 278-5957 (landline) 298-5957 (dsn) (410) 278-3587 (fax) Classification: UNCLASSIFIED Caveats: NONE