fir/ParallelHBFUpsampler: add headroom (gain=2)

This addresses part of #743
2017-06-12 18:58:28 +02:00 · 2017-06-12 18:58:28 +02:00 · 6ac9d0c41e
commit 6ac9d0c41e
parent 566ff73dff
1 changed files with 1 additions and 1 deletions
--- a/artiq/gateware/dsp/fir.py
+++ b/artiq/gateware/dsp/fir.py
@ -156,7 +156,7 @@ class ParallelHBFUpsampler(Module):
        i = [self.i]
        for coeff in coefficients:
            self.parallelism *= 2
-            hbf = ParallelFIR(coeff, self.parallelism, width, **kwargs)
+            hbf = ParallelFIR(coeff, self.parallelism, width + 1, **kwargs)
            self.submodules += hbf
            self.comb += [a.eq(b) for a, b in zip(hbf.i[::2], i)]
            i = hbf.o