frequency modulation [Archive]

jason

Mar1-05, 02:13 PM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Hello\n\nCan anyone tell me how phase modulation of an EM wave actually change\nits phase and only frequency?\nI would like to know the effect of changing the phase on the angular\nfreq, freq, and also phase\nKindly help\nthanks\n\nJason\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Hello

Can anyone tell me how phase modulation of an EM wave actually change
its phase and only frequency?
I would like to know the effect of changing the phase on the angular
freq, freq, and also phase
Kindly help
thanks

Jason

robert bristow-johnson

Mar2-05, 01:03 AM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>in article 1109394345.792521.177810@z14g2000cwz.googlegroups. com, jason at\ncheanglong@gmail.com wrote on 03/01/2005 15:13:\n\n> Can anyone tell me how phase modulation of an EM wave actually change\n> its phase and only frequency?\n> I would like to know the effect of changing the phase on the angular\n> freq, freq, and also phase\n> Kindly help\n\nthis is a good one for comp.dsp . briefly, the time derivative of\ninstantaneous phase is frequency. for a constant frequency, the (unwrapped)\nphase increases linearly forever. deviations of phase from that linear\ntrend can be modeled as the (indefinite) integral of some non-zero frequency\ndeviation from the "constant" frequency.\n\n--\n\nr b-j rbj@audioimagination.com\n\n"Imagination is more important than knowledge."\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>in article 1109394345.792521.177810@z14g2000cwz.googlegroups. com, jason at
cheanglong@gmail.com wrote on 03/01/2005 15:13:

> Can anyone tell me how phase modulation of an EM wave actually change
> its phase and only frequency?
> I would like to know the effect of changing the phase on the angular
> freq, freq, and also phase
> Kindly help

this is a good one for comp.dsp . briefly, the time derivative of
instantaneous phase is frequency. for a constant frequency, the (unwrapped)
phase increases linearly forever. deviations of phase from that linear
trend can be modeled as the (indefinite) integral of some non-zero frequency
deviation from the "constant" frequency.

--

r b-j rbj@audioimagination.com

"Imagination is more important than knowledge."

jason

Mar3-05, 04:23 PM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Thank you RBJ\nYour answer has arouse my further interests.\nIs there any more info you seen on this about this which is very\ncomprehensive?\nKindly share with me\nThank you\n\nrgds and thanks\nJason\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Thank you RBJ
Your answer has arouse my further interests.
Is there any more info you seen on this about this which is very
comprehensive?
Kindly share with me
Thank you

rgds and thanks
Jason