Forum Discussion
Altera_Forum
Honored Contributor
Honored Contributorphase detection am signal
Hi, i've implemented, in VHDL language, an iq demodulator for AM signal with the classic method of multiplying the input signal by sine and cosine, low pass filter and then SQRT(I^2 + Q^2). N...
Altera_ForumHonored Contributor
Honored Contributor --- Quote Start --- Your IQ demod provides phase of received signal. But why AM needs phase detection? --- Quote End --- The signal that i've to demodulate is in figure below http://www.alteraforum.com/forum/attachment.php?attachmentid=11167&stc=1 the phase of that signal could change as in figure below http://www.alteraforum.com/forum/attachment.php?attachmentid=11168&stc=1 the input signal could be also http://www.alteraforum.com/forum/attachment.php?attachmentid=11169&stc=1 i do not understand how detect phase change... before or after fir filter? could you explain me better? thanks
