Zero-Inserted Signal Reconstruction

Zero-inserted signal reconstruction is a digital signal processing method used to raise a signal’s sampling rate while keeping its important frequency content. A decimated signal has fewer samples and a narrower frequency range. To upsample it, zeros are inserted between the original samples.

Thi...

Consider a decimated signal with a reduced frequency range due to its lower sampling rate.

Insert zeros between each sample to upsample, that introduces repeated spectral replicas at intervals determined by the new Nyquist frequency.

Pass the zero-inserted sequence through a lowpass filter with a cutoff frequency at the new Nyquist...