Add PS1 SPU Gaussian interpolation - #39
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Port the reusable Gaussian interpolation slice from PR #16 while keeping its reverb engine on a separate branch. Co-authored-by: Martin Penkava <mpenkava1337@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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Adds the PS1 SPU four-tap Gaussian interpolation filter for decoded voice samples, including history across ADPCM blocks.
Adapted from #16 with source provenance and Martin Penkava's co-authorship preserved.
Focused interpolation tests pass. Tomba 2 exercised the path and passed gameplay, save, and transition checks; audio was reported notably smoother.