E=MC2 said:i have a question about amplitude modulation. in an AM transmitter the signal and the carrier frequency are multiplied with a mixer whose output is fed to the final stage amplifier which is then fed to an antenna. right????
the frequency of the carrier is about ten times the frequency of the signal (i read this somewhere). but when both the signals are multiplied the resulting amplitude modulated signal has the frequency of the carrier and the shape resembles the signal to be transmitted.
i understand the part that the output of the mixer resembles the signal. what i dont understand is why is the frequency of the modulated signal equal to the signal of the carrier. doesnt multiplication do anything to the frequency???
and my second question is that how are two analog signals multiplied?
actually i have a communications course this semester and i want to know everything about communications from A to Z. so any book recommendations would be greatly appreciated
E=MC2 said:i have a question about amplitude modulation. in an AM transmitter the signal and the carrier frequency are multiplied with a mixer whose output is fed to the final stage amplifier which is then fed to an antenna. right????
the frequency of the carrier is about ten times the frequency of the signal (i read this somewhere). but when both the signals are multiplied the resulting amplitude modulated signal has the frequency of the carrier and the shape resembles the signal to be transmitted.
i understand the part that the output of the mixer resembles the signal. what i dont understand is why is the frequency of the modulated signal equal to the signal of the carrier. doesnt multiplication do anything to the frequency???
and my second question is that how are two analog signals multiplied?
actually i have a communications course this semester and i want to know everything about communications from A to Z. so any book recommendations would be greatly appreciated
IanP said:Some additional explenations with examples you can find here:
h**p://www.seas.upenn.edu/~ee111/modulation/Modulation.html
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?