how its called the electronic module that reduces frequency?

[Muratus del Mur]

(electronics)

I am trying to build something (takes me up to 4-5 hours to fall asleep, but only if ikeep myself occupied with stuff not work related)/...and for this ..something... i need to map a large frequency range, as large as possible, lets say from  x up to 3Ghz, ad translate it into frequency in audible range. I am interested to group together the waves. sample it, idk how its called,,,you tell me.

 

In the end i want to be able to output the result and hear the pulses and whatever noise i get from condensing the high frequencies into lower frequencies. Accuracy is not imporant, and i am aware most of the data will be lost, its natural, you convert from a lot to just a few.

 

An electric or even a logic (programming) method might work, i am coding an arduino to do that, so either i need a module that i hav no clue how it should be named, or i do it from soft, and i cant image how exactly.....I pefere a module

 

A simpler example, to convert ultrasounds into audible sounds (i just need a lot higer frequency, but same concept like for this) Anyone any ideea?

 

Thnx

[I am Bored]

Well, there's resampling, but that typically is used to refer to adjusting the bitrate of the audio. Only other thing I can think of is a frequency modulator? No idea if that's what you're actually looking for though.

[Tom Pouce]

look at

 

http://en.wikipedia.org/wiki/Intermediate_frequency

 

Heterodyning principle

make an "sin"  (pure single frequency not square or other shape) oscillator at a frequency yu chose


and an cirquit tha multifly that with you other sigal (an nonlinear thing like diode circuit or something more sofisticate)

the result is  2  banswith of frequencies :signal frequencies  + oscillator frequency
and bandwith of frequensy : signal frequencies - oscillator frequency

now make an low filter or an band filter to take only the part you want of bandwith frequwncy: signal frequencies - oscillator frequency
 

Edited March 14, 2015 by Tom Pouce

[Muratus del Mur]

damn i thought it will be a lot more simple.

 

thank you anyway

[ZenTao]

A resistor? 

[Ary Endleg]

http://www.ehow.com/how_6134042_reduce-frequency-simple-circuit.html