Interpolation

Half-band filter interpolation

Half-band filter interpolation
  1. What is an interpolation filter?

What is an interpolation filter?

The interpolation filter contains an L-fold expander followed by a lowpass FIR filter H(z). The L-fold expander inserts L−1 zeroes between consecutive samples to the original signal x(n) and changes the sampling frequency fs of the original signal x(n) to a new sampling frequency Lfs.

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Why does the Hilbert transform only extract the modulated component of a signal?
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