Microsoft should be using voice alarm, not sounders. This is the 21st century.
With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. -----Original Message----- From: Ted Eckert [mailto:000007cf6ebeab9d-dmarc-requ...@ieee.org] Sent: Tuesday, February 7, 2017 1:52 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Acoustic Warning - sound pressure level Hello Doug, I can expand on Bernd's assessment with an example. The fire alarm annunciators in my building operate at 95 dB. They are loud enough that facilities hands out ear plugs the morning of our routine fire drills. They are not going to be missed by anybody, even somebody wearing headphone or somebody in a lab working with loud equipment. The audio level is set to reduce the risk of complacency through inaction while not being so loud as to pose a risk to hearing damage. The higher volumes are effective. Nobody stays in their office trying to finish up a little work just because it's only a fire drill. The alarm is loud enough that everybody in the building wants to get outside. Ted Eckert Microsoft The opinions expressed are my own and do not necessarily reflect those of my employer. -----Original Message----- From: Dürrer Bernd [mailto:bernd.duer...@wilo.com] Sent: Tuesday, February 7, 2017 12:04 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] AW: [PSES] Acoustic Warning - sound pressure level Hello Doug, depending on your environment or application, a difference of 3 to 6 dB SPL may not be sufficient. For example, the "Guidelines for Auditory Warning Systems on Civil Aircraft" (CAA Paper 82017) by Patterson recommend a difference of 15 to 25 dB SPL to ensure that an acoustic warning is not missed. If the spectrum of the ambient noise can be assumed as steady and is known or can be estimated, the SPL of a narrow-band acoustic warning should be adapted to the noise level in this frequency band to avoid excessive noise levels (see Figure 1 in the online article below). Besides sound pressure level, also localizability (if the warning is emitted by a device needing attention) and perceived urgency of the warning (if different warnings that require different reactions may be emitted) should be considered in the design. More details can be found in the book "Warning design: A research prospective" by Edworthy and Adams or online in the article: Edworthy J, Hellier E. Auditory warnings in noisy environments. Noise Health [serial online] 2000 [cited 2017 Feb 7];2:27-39. Available from: http://www.noiseandhealth.org/text.asp?2000/2/6/27/32649 Kind regards, Bernd Von: Doug Powell [mailto:doug...@gmail.com] Gesendet: Dienstag, 7. Februar 2017 00:58 An: EMC-PSTC@LISTSERV.IEEE.ORG Betreff: [PSES] Acoustic Warning - sound pressure level All, I recall some time ago reading information on minimum sound pressure level for acoustic warning in noisy environments. It was possibly in an IEC standard or a handbook making recommendations. As I recall the recommendation was something like warning bells, horns and klaxons should be 3 to 6 dB SPL above the ambient noise level in the immediate work area. If this is not possible or operators may be wearing hearing protection, then visual warnings should also be included. Can someone point me in the right direction? Thanks, Doug -- Douglas E Powell mailto:doug...@gmail.com http://www.linkedin.com/in/dougp01 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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