yase::Envelope Class Reference

#include <envelope.hh>

Inheritance diagram for yase::Envelope:

Collaboration diagram for yase::Envelope:

Detailed Description

An ADSR envelope.

Typically, the input signal is not used. The output is fed to, for example, the amplitude of a gain or the frequency of a filter. The attack phase is linear, the decay and release phases are exponential. The attack input determines the length of the attack in seconds. The release and decay inputs determine the release and decay rates according to

\(y = e^{-t/k}\)

where k is either the (decay or release) parameter.

Parameters

[in]	attack
[in]	decay
[in]	sustain
[in]	release
[in]	signal
[out]	signal

Public Member Functions
void	init ()
void	update ()
void	trigger ()
void	release ()
void	set_adsr (double aa, double dd, double ss, double rr)
Public Member Functions inherited from yase::Triggerable
void	init ()
void	update ()
virtual void	trigger ()=0
virtual void	release ()=0
Public Member Functions inherited from yase::Module
virtual void	init ()=0
virtual void	update ()=0
int	add_input (string name)
int	add_output (string name)
int	get_input_index (string name) const
string	get_input_name (int index) const
string	get_output_name (int index) const
int	get_output_index (string name) const
void	set_input (string name, double value)
void	set_input (int index, double value)
double	get_input (int index) const
double	get_input (string name) const
double	get_output (string name) const
double	get_output (int index) const
void	set_output (int index, double value)
void	copy_inputs (const Module &source)
void	copy_outputs (Module &destination) const
void	configure (std::vector< std::tuple< string, double > > assignments)
int	num_inputs () const
int	num_outputs () const
void	emit (Event e)
void	set_ts (double s)
double	get_ts ()

Member Function Documentation

init()

void yase::Envelope::init ( )

virtual

This method should be overridden by derived classes. It will usually be called once, after all modules and connections objects have been added to a synthesizer, but before the synthesizer starts running.

Implements yase::Module.

release()

void yase::Envelope::release ( )

virtual

Implements yase::Triggerable.

set_adsr()

void yase::Envelope::set_adsr	(	double	aa,
		double	dd,
		double	ss,
		double	rr
	)

The equivalent of doing

set_input("attack", aa);
set_input("decay",  dd);
set_input("sustain", ss);
set_input("release", rr);  

Parameters

aa	Attack duration
dd	Time to 90% decayed
ss	Percentage of maximum for the sustain
rr	To to 90% released

trigger()

void yase::Envelope::trigger ( )

virtual

Implements yase::Triggerable.

update()

void yase::Envelope::update ( )

virtual

This method should be overridden by derived classes. It will be called repeatedly by a synthesizer at a frequency determined by SAMPLE_RATE.

Implements yase::Module.

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The documentation for this class was generated from the following files:

• include/envelope.hh
• src/envelope.cc