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59 lines
1.4 KiB
59 lines
1.4 KiB
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#pragma once
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#ifndef DSY_PORT_H
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#define DSY_PORT_H
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#ifdef __cplusplus
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namespace daisysp
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{
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/** Applies portamento to an input signal.
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At each new step value, the input is low-pass filtered to
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move towards that value at a rate determined by ihtim. ihtim is the half-time of the
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function (in seconds), during which the curve will traverse half the distance towards the new value,
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then half as much again, etc., theoretically never reaching its asymptote.
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This code has been ported from Soundpipe to DaisySP by Paul Batchelor.
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The Soundpipe module was extracted from the Csound opcode "portk".
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Original Author(s): Robbin Whittle, John ffitch
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Year: 1995, 1998
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Location: Opcodes/biquad.c
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*/
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class Port
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{
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public:
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Port() {}
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~Port() {}
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/** Initializes Port module
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\param sample_rate: sample rate of audio engine
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\param htime: half-time of the function, in seconds.
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*/
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void Init(float sample_rate, float htime);
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/** Applies portamento to input signal and returns processed signal.
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\return slewed output signal
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*/
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float Process(float in);
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/** Sets htime
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*/
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inline void SetHtime(float htime) { htime_ = htime; }
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/** returns current value of htime
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*/
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inline float GetHtime() { return htime_; }
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private:
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float htime_;
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float c1_, c2_, yt1_, prvhtim_;
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float sample_rate_, onedsr_;
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};
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} // namespace daisysp
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#endif
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#endif
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