Re: Audio gen. RF harmonics
- From: Vladimir Vassilevsky <antispam_bogus@xxxxxxxxxxx>
- Date: Fri, 31 Aug 2007 17:55:18 GMT
LVMarc wrote:
Mark Jennings wrote:
I am hoping some mathematical genius can help me with this. I read of
a process whereby _specific_ harmonic frequencies can be added to a
fixed RF carrier by mixing it with an audio frequency. Both are
initially sinewaves, of course.
What is the mathematical basis for achieving this?
As an example, say one wants to add a 1.6MHz spectral component to a
fixed 4.6MHz carrier. What frequency within the audio range would
achieve this, and how is it determined.
Thank you greatly for any insight on this matter.
Mark Jennings
The process that matches your description is Frequency modulation of the RF caRRIER. Say you have an rf carrier of 4.6 Mc, and you take a 20 Kc tone and frequency modulate the carrier.
[...]
The amthemactical function that describes the placemt and amplitude distribution of this "harmonics" often called sidebands, are the bessel's function.
Furthermore, if you modulate the frequency and the amplitude at the same time, you can get very peculiar spectrum. However the 20kHz modulation is not going to produce a pure 1.6MHz tone in addition to 4.6MHz carrier.
Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com
.
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- Audio gen. RF harmonics
- From: Mark Jennings
- Re: Audio gen. RF harmonics
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