Secondary Harmonics

Dear Experts,

I seem to remember form my class at Cornell many years ago that secondary 
harmonics as shown on a spectrogram are really a result of the recording 
equipment and filtering these out of a cut will not degrade the final audio 
product. 
Actually, what I am trying to determine is if I filter a cut to reduce insect 
noise and this noise is also in the band where the secondary harmonic is, will 
I be significantly degrading the final audio product?

Any ideas are greatly appreciated.

John

John V. Moore Nature Recordings



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