Subject: Re: Hearing aids power consumption From: Christine Rankovic <rankovic@xxxxxxxx> Date: Wed, 17 Dec 2008 17:47:23 -0500 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>This is a multi-part message in MIME format. ------=_NextPart_000_000B_01C9606F.841B2E60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable See: Kates, James M. (2008). "Digital Hearing Aids." Plural = Publishing (www.pluralpublishing.com) In his discussion of power consumption, Kates reports the following for = a typical digital hearing aid (p. 9): =20 Total current drain: 1 mA Microphone and A/D: 200 uA Digital processor, associated memory, and D/A : 700 uA Output amplifier and receiver: 50 uA Christine Rankovic ----- Original Message -----=20 From: Yi-Wen Liu=20 To: AUDITORY@xxxxxxxx=20 Sent: Wednesday, December 17, 2008 4:09 PM Subject: Hearing aids power consumption Dear all,=20 We all know that hearing-aid batteries run out quickly. I am wondering = whether the battery power is mainly consumed by the digital = signal-processing circuitry, or by the analog amplifier and receiver? = Does anybody know an approximate percentage, say 60% DSP and 40% analog = (just my random guess)?=20 Best regards,=20 Yi-Wen Liu=20 Boys Town National Research Hospital ------=_NextPart_000_000B_01C9606F.841B2E60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!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 6.00.2900.3354" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>See: </FONT><FONT face=3DArial = size=3D2>Kates,=20 James M. (2008). "Digital Hearing Aids." Plural Publishing = (<A=20 href=3D"http://www.pluralpublishing.com">www.pluralpublishing.com</A>)</F= ONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>In his discussion of power = consumption, Kates=20 reports the following for a </FONT><FONT face=3DArial = size=3D2> typical=20 digital hearing aid (p. 9):</FONT></DIV> <DIV><FONT face=3DArial size=3D2> </FONT></DIV> <DIV><FONT face=3DArial size=3D2>Total current drain: 1 = mA</FONT></DIV> <DIV><FONT face=3DArial size=3D2>Microphone and A/D: 200 = uA</FONT></DIV> <DIV><FONT face=3DArial size=3D2>Digital processor, associated memory, = and D/A=20 : 700 uA</FONT></DIV> <DIV><FONT face=3DArial size=3D2>Output amplifier and receiver: 50 = uA</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Christine Rankovic</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <BLOCKQUOTE=20 style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV> <DIV=20 style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B>=20 <A title=3Djacobliu@xxxxxxxx = href=3D"mailto:jacobliu@xxxxxxxx">Yi-Wen Liu</A>=20 </DIV> <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A = title=3DAUDITORY@xxxxxxxx=20 href=3D"mailto:AUDITORY@xxxxxxxx">AUDITORY@xxxxxxxx</A> = </DIV> <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, December 17, = 2008 4:09=20 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Hearing aids power=20 consumption</DIV> <DIV><BR></DIV>Dear all, <BR><BR>We all know that hearing-aid = batteries run=20 out quickly. I am wondering whether the battery power is mainly = consumed by=20 the digital signal-processing circuitry, or by the analog amplifier = and=20 receiver? Does anybody know an approximate percentage, say 60% DSP and = 40%=20 analog (just my random guess)? <BR><BR>Best regards, <BR>Yi-Wen Liu = <BR>Boys=20 Town National Research Hospital</BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_000B_01C9606F.841B2E60--