There are a number of applications for banks of bandpass filters in professional audio studios, both for film and music production. In this paper, we explore digital techniques for bandsplitting that have the property that the spectrum my be separated into a number of bands such that when these bands are added back together, the result is a pure delay. There need be no amplitude or phase distortion other than delay. This allows such applications as linear-phase graphic equalizers, multi-band noise gates, and many other improvements over conventional studio equipment. These algorithms have been implemented on a large-scale audio signal processor and run in real time. They are currently being used in major motion picture production.
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