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fir/ParallelHBFUpsampler: add headroom (gain=2) 

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