VFX Article, Appendix C

C. The digital filter design software

The digital filter used in the Echo and Reverb effect was designed with the Filter and Digital Analysis Software (FDAS) from Momentum Data Systems software. The software was used to implement a Finite Impulse Response (FIR) filter. The optional code generator wrote the source code for the filter given its characteristics. The package also runs on the ADSP-2101 processor and other family members. The FDAS software can also implement digital filters of other types besides FIR, including Infinite Impulse Response (IIR) and some analog equivalent types.

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