Subject: Re: Child's scream From: "James W. Beauchamp" <j-beauch(at)UX1.CSO.UIUC.EDU> Date: Mon, 26 Mar 2001 10:45:41 -0600I measured my son when he was about 2 years old, when he was fond of making a very high-pitched, high-volume whine. He generated about 100 dB at about 2 foot (0.6 m) distance. I don't think he could get much above that level. He continues to project very loud levels from time to time, but thankfully at a lower pitch. Jim Beauchamp University of Illinois at Urbana-Champaign Torben Poulsen wrote: >Dear list, >I got a question from a medical doctor asking for info about the >'noise' level of a child's scream. > >She has been told that a child (age 10-11 years) should be able to >produce a level of 140 dB over a period of 10 to 20 minutes. (Measured >at a short distance, I believe). > >I'm sceptical about the numbers. I found some paper titles like >'...Cries of Infants with "Colic".' and '... acoustic analysis of >child laughter'. Most of them are about children up to about three >years - and in journals which are not in our library. (A JASA paper >has no levels, but a lot of f0's, timing, envelopes etc.) > >Do you happen to know about this? > >Torben > >-------------------------------- >Torben Poulsen >=D8rsted=95DTU, Acoustic Technology >Building 352, Technical University >DK-2800 Lyngby, Denmark >Telephone: +45 4525 3940, Fax: +45 4588 0577