Peter Craven's work *is* public. His paper describes the concepts of apodizing in conjunction with minimum phase filters. It would still require quite an effort and an understanding of digital audio to properly implement such a filter. As Bob and others have said, there are many trade-offs to be made and there is no such thing as a "perfect" apodizing filter.

I assume that Meridian funded Craven's work and had early access to it.

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