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17-04-2024
Physics

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A baseband signal with a spectrum occupying frequencies from 0 up to 4 kHz is DSBSC-modulated using a 240 kHz carrier frequency and is undersampled at 10 kHz. Which harmonic of the sampling train's spectrum achieves the direct conversion of the so modulated signal?
1) First harmonic
2) Second harmonic
3) Third harmonic
4) Fourth harmonic

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