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#X text 61 83 Stuff to test it:;
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#X restore 424 542 pd test;
#X text 40 446 (Pd also provides a suite of user-friendly filters.
This and other raw filters are provided for situations which the user-friendly
ones can't handle. See Chapter 8 of http://msp.ucsd.edu/techniques.htm
for an introduction to the necessary theory.), f 68;
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#X text 262 294 coefficient (real and imaginary part);
#X msg 133 179 set 0.6 0.8;
#X text 66 374 where y[n] is the output \, x[n] the input \, and a[n]
the filter coefficient (all complex numbers). The filter is always
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#X text 36 44 Czero_rev~ filters a complex audio signal (first two
inlets) via a one-zero filter \, whose coefficients are controlled
by creation arguments or by another complex audio signal (remaining
two inlets). The impulse response is that of "rzero" reversed in time.
, f 64;
#X text 103 347 y[n] = - a[n] * x[n] + x[n-1];
#X text 66 414 The transfer function is H(Z) = -a + Z^-1.;
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#X text 42 624 see also:;
#X text 386 620 updated for Pd version-0.38;
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#X text 257 561 real;
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#X text 168 541 1-zero \, reversed;
#X text 73 520 summary of raw filters:;
#X text 155 623 etc.: user-friendly filters;
#X text 123 13 - complex one-zero (non-recursive) "reverse" filter
\, raw;
#X text 198 207 <= signal to filter (imaginary part);
#X text 230 232 <= filter coefficient (real part);
#X text 260 255 <= filter coefficient (imaginary part);
#X text 240 280 <= creation arguments initialize filter;
#X text 168 127 <= signal to filter (real part);
#X text 166 152 <= clear internal state to zero;
#X text 219 180 <= set internal state (real&imaginary parts);
#X text 50 324 The action of czero_rev~ is:;
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