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I have the same problem with my bathroom fan knocking out my tv, electric motors in general produce an electic field that interupts your signal pattern, also yes i am amazed you have a signal at all with the cables like that, its fairly easy to join them strip both ends back join the 2 inner cores in a connector then twist the stranded outer cores together ...


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That is called EMC : Electromagnetic compatibility. Your DC machine stator is fed through a brush. Since it is rubbing the commutator plates, it can generate sparks, small arcs and so on. Since these phenomena are really fast, they tend to emit electromagnetic radiations in the whole frequency spectrum (see the Fourier transform of a dirac delta function) ...


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Difficult to say unless you specify what your software calculates and how the ccf is normalised. Usually you would design it so a perfect match gave a ccf of unity at zero lag. In general you expect to get a big peak in the centre with a FWHM that is roughly the sum of the spectral resolutions of your individual spectra. Using wavelength on the x-axis is ...


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For general audio programming or playback, 96kHz or 192hHz is simply useless. Indeed, the Nyquist theorem tells you that a signal can be exactly reproduced given that the sample rate is greater than the highest frequency contained in the original signal. The "excuse" of the slope of analog filter required after digital to analog conversion is no longer ...


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because the higher the sampling rate is the sloppier the (annalogue) filtering preceding the sampler can be to reduce the aliased noise/interference



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