Talk:Group delay and phase delay

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How is group delay defined for a frequency translating device (a mixer)? If the input and output frequencies are different, their phases cannot be directly compared. It would be possible to compare the phase to that of an ideal frequency transliting device. Are there other, better definitions? How can it be measured? (A simple example of a mixer is an AM radio. Signals at several MHz are translated down to audible frequencies).--HelgeStenstrom 13:29, 2 May 2006 (UTC)

[edit] article move and revamping.

i'm a little busy at the moment, but i do want to continue with this rewrite including a couple of drawings that i haven't done yet. as i said in the move comments, i want to start with first principles where both group delay and phase delay are defined and then have the article go over the specific places where group or phase delay (mostly the former) are used (optics, transmission lines, audio, etc.). also, thanks to User:81.240.215.127 for correcting my convolution integral mistake. r b-j 17:41, 6 March 2007 (UTC)