<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1106" name=GENERATOR> <STYLE>@font-face { font-family: Tahoma; } @page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.25in 1.0in 1.25in; } P.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } LI.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } DIV.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } A:link { COLOR: blue; TEXT-DECORATION: underline } SPAN.MsoHyperlink { COLOR: blue; TEXT-DECORATION: underline } A:visited { COLOR: blue; TEXT-DECORATION: underline } SPAN.MsoHyperlinkFollowed { COLOR: blue; TEXT-DECORATION: underline } SPAN.EmailStyle18 { COLOR: navy; FONT-FAMILY: Arial } DIV.Section1 { page: Section1 } </STYLE> </HEAD> <BODY lang=EN-US vLink=blue link=blue bgColor=white> <DIV>Jerry,</DIV> <DIV>It stands to reason, if it were called = harmonic distortion, it would have harmonics.</DIV> <DIV>There is all kinds of distortion, and it = is NOT all harmonic. Check out an electronics book. As two examples, how = about phase distortion and  amplitude distortion.</DIV> <DIV>I know you said most common, but that is = just a matter of opinion.</DIV> <DIV> </DIV> <DIV>John M. Ross Windsor, Nova Scotia, Canada <A href="mailto:jrpiano@win.eastlink.ca">jrpiano@win.eastlink.ca</A></DIV>= <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black">From: <A title=emailforjc@yahoo.com = href="mailto:emailforjc@yahoo.com">Jerry Cohen</A> </DIV> <DIV style="FONT: 10pt arial">To: <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">'Pianotech'</A> </DIV> <DIV style="FONT: 10pt arial">Sent: Monday, August 23, 2004 = 5:34 PM</DIV> <DIV style="FONT: 10pt arial">Subject: RE: Tuning with a fork = [fork partials]</DIV> <DIV> </DIV> <DIV class=Section1> When a = device (speaker, amplifier etc.) produces distortion in the form of = harmonics, it is call “harmonic distortion”. It is the most common form of = distortion in audio.   Jerry Cohen NJ Chapter   -----Original Message----- From: = <A = href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</A> [mailto:pianotech-bounces@ptg.org] On Behalf Of John Ross Sent: Monday, August 23, 2004 = 12:29 PM To: = dporritt@mail.smu.edu; Pianotech Subject: = Re: Tuning with a fork [fork partials]   <DIV> Hi David,</DIV> <DIV>  </DIV> <DIV> I realize = that.</DIV> <DIV>  </DIV> <DIV> However, = I don't think the distortion could be considered an harmonic, which is what = the question asked.</DIV> <DIV>  </DIV> <DIV> John</DIV> <DIV> John M. Ross Windsor, = Nova Scotia, Canada <A = href="mailto:jrpiano@win.eastlink.ca">jrpiano@win.eastlink.ca</A></SPAN= ></DIV> <BLOCKQUOTE style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: = medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0in; MARGIN: 5pt 0in 5pt = 3.75pt; BORDER-LEFT: black 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: = medium none"> <DIV> ----- Original Message = ----- </DIV> <DIV style="font-color: black"> From: <A title=dporritt@mail.smu.edu = href="mailto:dporritt@mail.smu.edu">David M. Porritt</A> </DIV> <DIV> To: <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV> Sent: Monday, August 23, 2004 1:15 PM</DIV> <DIV> Subject: Re: Tuning with a fork [fork partials]</DIV> <DIV>  </DIV> John:   I'm sure that the = Accufork and TuneLab both produce a sine wave.  Howver, unless you have a = very capable speaker there is going to be distortion there and partials added.  It takes quite a good speaker to reproduce a 440Hz sine = wave with no distortion.   dave __________________________________________</= P> David M. Porritt, RPT Meadows School of the Arts Southern Methodist University Dallas, TX 75275 <A = href="mailto:dporritt@mail.smu.edu">dporritt@mail.smu.edu</A></F= ONT>   ----- Original message = ----------------------------------------> From: John Ross <<A = href="mailto:jrpiano@win.eastlink.ca">jrpiano@win.eastlink.ca</A>><B= R>To: Pianotech <<A = href="mailto:pianotech@ptg.org">pianotech@ptg.org</A>> Received: = Mon, 23 Aug 2004 13:02:28 -0300 Subject: Re: Tuning with a fork [fork partials] Hi, <DIV> Al = Sanderson told me that the Accu-Fork, gave a pure tone, with no harmonics.</DIV> <DIV> Regards,</DIV> <DIV> John M. = Ross Windsor, Nova Scotia, Canada <A = href="mailto:jrpiano@win.eastlink.ca">jrpiano@win.eastlink.ca</A></SPAN= ></DIV> <BLOCKQUOTE style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: = medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0in; MARGIN: 5pt 0in 5pt = 3.75pt; BORDER-LEFT: black 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: = medium none"> <DIV> ----- = Original Message ----- </DIV> <DIV style="font-color: black"> From: <A title=BobDavis88@aol.com href="mailto:BobDavis88@aol.com">BobDavis88@aol.com</A> </DIV> <DIV> To: <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV> Sent: Monday, August 23, 2004 12:55 PM</DIV> <DIV> Subject: Re: Tuning with a fork [fork partials]</DIV> <DIV>  </DIV> <DIV> <DIV> Joe = Goss writes:</DIV> <BLOCKQUOTE style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; = BORDER-TOP: medium none; MARGIN-TOP: 5pt; PADDING-LEFT: 4pt; = MARGIN-BOTTOM: 5pt; PADDING-BOTTOM: 0in; MARGIN-LEFT: 3.75pt; = BORDER-LEFT: blue 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium = none"> To = check your accu fork open the battery compartment and look for a = little white plastic slot ( 1/8" at the most ). = </BLOCKQUOTE></DIV> <DIV> Hello = Joe,</DIV> <DIV>  </DIV> <DIV> Thanks for the info. I didn't make myself clear. My AccuFork is right on pitch. = What I was wondering about was if the harmonic content of a newer = unit was any different from the partial-rich output of mine.</DIV> <DIV>  </DIV> <DIV> Thanks for the reply,</DIV> <DIV> Bob = Davis</DIV></BLOCKQUOTE></BLOCKQUOTE></DIV></BLOCKQUOTE= ></BODY></HTML>