[Speex-dev] filter_mem16 implementation

[P GOUV]

Why filters although they are Direct Form 2 Transposed when setting yι

 yi =
EXTRACT16(SATURATE(ADD32(EXTEND32(x[i]),PSHR32(mem[0],LPC_SHIFT)),32767));

x[i] isnt multiplied by num[0];
Like type here
http://www.mathworks.com/help/techdoc/ref/filter.html#f83-1015962
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