Alias cancellation refers to the technique used to prevent or eliminate the aliasing effects that occur during the signal processing of discrete-time signals, particularly in systems like Quadrature Mirror Filter (QMF) banks. This process is crucial for ensuring that high-frequency components do not interfere with lower frequency signals when they are sampled and reconstructed, thereby maintaining the integrity of the original signal. By using specific filter designs, alias cancellation helps in recovering signals with minimal distortion and ensures proper representation across various frequency bands.
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