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Electronics => Projects, Designs, and Technical Stuff => Topic started by: delicado on February 24, 2017, 04:36:48 am

Title: Mixing two high-frequency signals
Post by: delicado on February 24, 2017, 04:36:48 am

Hi

When two high-frequency (~25kHz) signals are mixed on an electret mic's diaphragm, will an audible noise be recorded? For this to happen, do the input signals need to be modulated?

Thanks

Title: Re: Mixing two high-frequency signals
Post by: amspire on February 24, 2017, 05:35:25 am

In theory, if two frequencies, say 25Khz and 30KHz are added in a completely linear system, then all you end up with is 25Khz and 30KHz.

If there is any non-linearity at all in the microphone diaphram (ie distortion), you will some 5Khz.