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cosine signal can make square signal shift frequency.

squar_,ove.png

suare_resul.png If I have only sine signal source,how to make square signal shift frequency?

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    $\begingroup$ You need to understand real signal versus complex spectrum. Complex multiplication of a (complex; I and Q components) input signal with Sine/Cosine as shift frequency results in a complex output signal. The problem is the generation of a square wave as complex signal: limited spectrum. Wait for a better explanation. $\endgroup$
    – user16925
    Nov 5, 2021 at 12:31
  • $\begingroup$ Note that a sine wave has no harmonics; a square wave has an infinite number of harmonics. $\endgroup$
    – Mike Waters
    Nov 5, 2021 at 18:14
  • $\begingroup$ Aside from this still being a math, not a radio question: There's absolutely no difference between a cosine and a sine; one is just the other, delayed by ¼ period. It's absolutely not clear where this question comes from, because you – still, after much asking in your last Q's comments– did not add any of your own math to this question. And we're really not here to do your part of the homework that says "write down what a frequency shift is". Doing this minimal part on your own would either directly answer your question, or if it's hard, give you a sensible question to ask. $\endgroup$ Nov 5, 2021 at 20:48
  • $\begingroup$ For those interested in discussing the close-voteyness I have on this: We have a meta question exactly on this: ham.meta.stackexchange.com/a/466/4076 $\endgroup$ Nov 5, 2021 at 20:51
  • $\begingroup$ @MarcusMüller,Thanks for the reference link.I asked a radio question related to gnuradio.Maybe you have answer,please post it,even math methodology behind it. $\endgroup$
    – kittygirl
    Nov 6, 2021 at 22:16

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