Subject: Upper/lower freq bounds for speech M/F/children ?? From: "Richard H." <auditory(at)AUGMENTICS.COM> Date: Wed, 7 Sep 2005 09:59:11 +0100This is a multi-part message in MIME format. ------=_NextPart_000_0022_01C5B392.CB7B4DE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi, Hearing aids can boost frequencies up to about 8KHz. However very low frequencies and higher frequencies do not need to be boost= ed because they are outside the main speech areas. However can anyone suggest a pragmatic lower & upper bound "cutoff" frequen= cy where we don't really need to boost speech sounds? The upper speech frequency of very young, female speakers I assume would be= the upper limit ... does anyone know this frequency? How about the lower end? What low frequencies do we not need to boost? I as= sume this would correspond to the lowest freq edge of a deep adult male voi= ce. Thanks! Richard ------=_NextPart_000_0022_01C5B392.CB7B4DE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2900.2722" name=3DGENERATOR> <DEFANGED_style_0 </STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DEFANGED_DIV><FONT face=3DArial>Hi,</FONT></DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial></FONT> </DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial>Hearing aids can boost frequencies up to a= bout=20 8KHz.</FONT></DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial></FONT> </DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial>However very low frequencies and higher fr= equencies do not=20 need to be boosted because they are outside the main speech areas.</FONT></= DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial></FONT> </DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial>However can anyone suggest a pragmatic low= er & upper=20 bound "cutoff" frequency where we don't really need to boost speech=20 sounds?</FONT></DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial></FONT> </DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial>The upper speech frequency of very young, = female speakers=20 I assume would be the upper limit ... does anyone know this=20 frequency?</FONT></DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial></FONT> </DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial>How about the lower end? What low frequenc= ies do we not=20 need to boost? I assume this would correspond to the lowest freq edge of a = deep=20 adult male voice.</FONT></DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial></FONT> </DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial>Thanks!</FONT></DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial></FONT> </DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial>Richard</FONT></DEFANGED_DIV> <DEFANGED_DIV><FONT face=3DArial></FONT> </DEFANGED_DIV></BODY></HTML> ------=_NextPart_000_0022_01C5B392.CB7B4DE0--