## audacity-nyquist — Discussion among Nyquist programmers creating plug-ins for Audacity

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 [Audacity-nyquist] Help with individual signal samples. From: - 2009-06-19 22:20:32 Attachments: Message as HTML ```I posted something similar on an Audacity forum but was referred to Appendix 1 on extending Nyquist with C programming. Since programming is a hobby and I don't know C or Lisp I thought a Nyquist-Lisp type solution might be easier but I'm not sure. Here is what I need. Say f(i) is a function of sampling index i and f(i) is fully defined on just 15 index values. Specifically, f(i) = 27/16(i^3 + 2i^2 + i) for i = -7 to 7. Now, there is some sound signal s(j) where j is it's sampling index. I wanted to form a new sound signal n(j) by summing the multiplied pairs f(i)s(j+i) for i = -7 to +7 for each possible j. f(-7)s(j-7) f(-6)s(j-6) f(-5)s(j-5) ... f(6)s(j+6) f(7)s(j+7) -------------- SUM the above to give a single value of n at some value of index j. -------------- Furthermore, I want to do this across all possible values of j for signal s to form the new signal n. Nyquist has some filter functions but none are cubic and I don't see a way to specify ones own filter function that would do what I want. How do you set this thing up? Thanks. ```

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