Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

What does this demodulation represent?

Status
Not open for further replies.
W

watertreader

Full Member level 3
Joined
Dec 2, 2005
Messages
174
Helped
4
Reputation
8
Reaction score
0
Trophy points
1,296
Activity points
2,560
Hi,

I am wondering how should we classify the demodulation circuit for demodulating a signal c+|m|cos(wt + phi) by

inphase => phi = 0 ; offphase => phi = pi; and |m| is the message signal

demodulation method: signal(inphase) - signal(off-phase)

what does this demodulation represent?

thanks
 

Re: Demodulation circuit

This results:

(c + |m| cos(Wct + 0)) - (c + |m| cos(Wct + pi)) = | m| cos(Wct + 0) - |m| cos(Wct + pi) = 2 |m| cos(Wct)

the signal isn't demodulated !
 

Demodulation circuit

pi is 180d.

you want pi/2, or 90d
 

Re: Demodulation circuit

Thanks,

So instead for v =c+|m|cos(wt + phi), could we use vmax - vmin to retrieve the modulation index and the modulation infromation?

vmax = max(c+|m|cos(wt + phi)) and vmin = min(c+|m|cos(wt + phi))

egards
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top