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Version 4.4.0

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Gary Scavone
2013-09-29 23:11:39 +02:00
committed by Stephen Sinclair
parent d199342e86
commit eccd8c9981
287 changed files with 11712 additions and 7676 deletions
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67
src/Asymp.cpp
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@@ -6,7 +6,7 @@
which asymptotically approaches a target value.
The algorithm used is of the form:
x[n] = a x[n-1] + (1-a) target,
y[n] = a y[n-1] + (1-a) target,
where a = exp(-T/tau), T is the sample period, and
tau is a time constant. The user can set the time
@@ -19,20 +19,26 @@
to \e keyOn and \e keyOff messages by ramping to
1.0 on keyOn and to 0.0 on keyOff.
by Perry R. Cook and Gary P. Scavone, 1995 - 2007.
by Perry R. Cook and Gary P. Scavone, 1995 - 2009.
*/
/***************************************************/
#include "Asymp.h"
#include <cmath>
Asymp :: Asymp(void) : Envelope()
namespace stk {
Asymp :: Asymp( void )
{
value_ = 0.0;
target_ = 0.0;
state_ = 0;
factor_ = exp( -1.0 / ( 0.3 * Stk::sampleRate() ) );
constant_ = 0.0;
Stk::addSampleRateAlert( this );
}
Asymp :: ~Asymp(void)
Asymp :: ~Asymp( void )
{
}
@@ -44,33 +50,31 @@ void Asymp :: sampleRateChanged( StkFloat newRate, StkFloat oldRate )
}
}
void Asymp :: keyOn(void)
void Asymp :: keyOn( void )
{
Envelope::keyOn();
constant_ = ( 1.0 - factor_ ) * target_;
this->setTarget( 1.0 );
}
void Asymp :: keyOff(void)
void Asymp :: keyOff( void )
{
Envelope::keyOff();
constant_ = ( 1.0 - factor_ ) * target_;
this->setTarget( 0.0 );
}
void Asymp :: setTau(StkFloat tau)
void Asymp :: setTau( StkFloat tau )
{
if (tau <= 0.0) {
if ( tau <= 0.0 ) {
errorString_ << "Asymp::setTau: negative or zero tau not allowed ... ignoring!";
handleError( StkError::WARNING );
return;
}
factor_ = std::exp( -1.0 / ( tau * Stk::sampleRate() ) );
factor_ = std::exp( -1.0 / ( tau * Stk::sampleRate() ) );
constant_ = ( 1.0 - factor_ ) * target_;
}
void Asymp :: setTime(StkFloat time)
void Asymp :: setTime( StkFloat time )
{
if (time <= 0.0) {
if ( time <= 0.0 ) {
errorString_ << "Asymp::setTime: negative or zero times not allowed ... ignoring!";
handleError( StkError::WARNING );
return;
@@ -81,34 +85,19 @@ void Asymp :: setTime(StkFloat time)
constant_ = ( 1.0 - factor_ ) * target_;
}
void Asymp :: setTarget(StkFloat target)
void Asymp :: setTarget( StkFloat target )
{
Envelope::setTarget( target );
target_ = target;
if ( value_ != target_ ) state_ = 1;
constant_ = ( 1.0 - factor_ ) * target_;
}
StkFloat Asymp :: computeSample(void)
void Asymp :: setValue( StkFloat value )
{
if (state_) {
value_ = factor_ * value_ + constant_;
// Check threshold.
if ( target_ > value_ ) {
if ( target_ - value_ <= TARGET_THRESHOLD ) {
value_ = target_;
state_ = 0;
}
}
else {
if ( value_ - target_ <= TARGET_THRESHOLD ) {
value_ = target_;
state_ = 0;
}
}
}
lastOutput_ = value_;
return value_;
state_ = 0;
target_ = value;
value_ = value;
}
} // stk namespace