FA-91349 / Digital signal filters / Member archive

Streaming FIR shifts the old history instead of the new sample · case 04

Every output equals taps[0] times the current sample; past samples never enter the delay line.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Input [taps, blocks] of integers. Filter the concatenated stream with y[n] = sum_k taps[k] x[n-k] (zero initial history) while processing block by block; return the outputs grouped per input block.

Why this case matters

Block-based FIR processing must carry history across buffer boundaries or every block edge glitches.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: random stream 20	`[[-3, 2]]`	`[[-3, -1]]`	Failed

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