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Merge pull request #72 from singalsu/fix_eq_fir_length_trailing_zeros 

EQ FIR: Add check and removal for trailing zeros in filter coefficients
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Liam Girdwood 2018-09-19 20:35:36 +01:00 committed by GitHub
parent e4ca26b55f c43666d6f0
commit 78748d42b9
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1 changed files with 18 additions and 2 deletions
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20
tune/eq/eq_fir_blob_quant.m
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@ -44,15 +44,31 @@ if nargin < 2
bits = 16;
end
%% Quantize
[bq, shift] = eq_fir_quantize(b, bits);
nb = length(bq);
%% Check trailing zeros
nf = length(bq);
nz = nf;
while bq(nz) == 0
nz = nz - 1;
end
if nz < nf
nb = nz + 1;
fprintf(1,'Note: Filter length was reduced to %d -> %d due to trailing zeros.\n', ...
nf, nb);
bq = bq(1:nb);
else
nb = nf;
end
%% Make length multiple of four (optimized FIR core)
mod4 = mod(nb, 4);
if mod4 > 0
pad = zeros(1,4-mod4);
bqp = [bq pad];
nnew = length(bqp);
fprintf(1,'Note: Filter length was %d, padded length into %d,\n', nb, nnew);
fprintf(1,'Note: Filter length was %d, padded length into %d.\n', nb, nnew);
else
nnew = nb;
bqp = bq;