user 37518
Well-known member
Im reading Steve Dove's series of articles on "Designing a professional mixing console", overall I find it very informative, however his somehow convoluted and embellished (almost poetic) way of writting makes it difficult to follow for me, a non native english language speaker. Anyway, in parts 8 and 9 he mentions a type of filter similar to a state variable filter, but instead of using integrators, it uses all-pass sections, the author calls this "CAPS filter" (Constant Amplitude Phase Shift) but I have never seen such filter before, nor I can find any info on the web, the article does not describe the circuit very well. In part 9 he provides a complete EQ schematic using these type of filters, so I would like to know more about the CAPS filter, do you guys know of any source that describes the operation of this filter?