Aliasing is an inherent condition of discrete signals, which can occur when manipulating the signal, even after the process of digitizing analog signals. In dynamic processors like compressors, spectral expansion produced by signal manipulation can lead to aliasing. Traditionally, oversampling has been the most common approach to deal with this problem. This means increasing the sample rate of the signal to allow spectral expansion before returning to the original sample rate once proper band-limiting has been applied. However, another solution is to band-limit the involved signals prior to compression. In this paper, we compare the effectiveness of these strategies and quantify them. Our comparison highlights the importance and power of measuring aliasing and demonstrates how to perform a black-box measurement of dynamic processors, as long as they have a side-chain input.
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https://aes2.org/publications/elibrary-page/?id=22081
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