You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
1.4 KiB
60 lines
1.4 KiB
4 years ago
|
|
||
|
|
#pragma once
|
||
|
|
#ifndef DSY_PORT_H
|
||
|
|
#define DSY_PORT_H
|
||
|
|
#ifdef __cplusplus
|
||
|
|
|
||
|
|
namespace daisysp
|
||
|
|
{
|
||
|
|
/** Applies portamento to an input signal.
|
||
|
|
|
||
|
|
At each new step value, the input is low-pass filtered to
|
||
|
|
move towards that value at a rate determined by ihtim. ihtim is the half-time of the
|
||
|
|
function (in seconds), during which the curve will traverse half the distance towards the new value,
|
||
|
|
then half as much again, etc., theoretically never reaching its asymptote.
|
||
|
|
|
||
|
|
This code has been ported from Soundpipe to DaisySP by Paul Batchelor.
|
||
|
|
|
||
|
|
The Soundpipe module was extracted from the Csound opcode "portk".
|
||
|
|
|
||
|
|
Original Author(s): Robbin Whittle, John ffitch
|
||
|
|
|
||
|
|
Year: 1995, 1998
|
||
|
|
|
||
|
|
Location: Opcodes/biquad.c
|
||
|
|
*/
|
||
|
|
class Port
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
Port() {}
|
||
|
|
~Port() {}
|
||
|
|
/** Initializes Port module
|
||
|
|
|
||
|
|
\param sample_rate: sample rate of audio engine
|
||
|
|
\param htime: half-time of the function, in seconds.
|
||
|
|
*/
|
||
|
|
|
||
|
|
void Init(float sample_rate, float htime);
|
||
|
|
|
||
|
|
/** Applies portamento to input signal and returns processed signal.
|
||
|
|
\return slewed output signal
|
||
|
|
*/
|
||
|
|
float Process(float in);
|
||
|
|
|
||
|
|
|
||
|
|
/** Sets htime
|
||
|
|
*/
|
||
|
|
inline void SetHtime(float htime) { htime_ = htime; }
|
||
|
|
/** returns current value of htime
|
||
|
|
*/
|
||
|
|
inline float GetHtime() { return htime_; }
|
||
|
|
|
||
|
|
private:
|
||
|
|
float htime_;
|
||
|
|
float c1_, c2_, yt1_, prvhtim_;
|
||
|
|
float sample_rate_, onedsr_;
|
||
|
|
};
|
||
|
|
} // namespace daisysp
|
||
|
|
#endif
|
||
|
|
#endif
|