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49 lines
791 B
49 lines
791 B
// Allpass filter declaration
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//
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// Written by Jezar at Dreampoint, June 2000
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// http://www.dreampoint.co.uk
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// This code is public domain
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#ifndef _allpass_
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#define _allpass_
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#include "denormals.h"
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class allpass
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{
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public:
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allpass();
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void setbuffer(float *buf, int size);
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inline float process(float inp);
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void mute();
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void setfeedback(float val);
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float getfeedback();
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// private:
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float feedback;
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float *buffer;
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int bufsize;
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int bufidx;
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};
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// Big to inline - but crucial for speed
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inline float allpass::process(float input)
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{
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float output;
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float bufout;
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bufout = buffer[bufidx];
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undenormalise(bufout);
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output = -input + bufout;
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buffer[bufidx] = input + (bufout*feedback);
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if(++bufidx>=bufsize) bufidx = 0;
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return output;
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}
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#endif//_allpass
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//ends
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