Package wellen.analysis

Class EnvelopeFollower

java.lang.Object

wellen.analysis.EnvelopeFollower

public class EnvelopeFollower
extends Object

detect an envelope from an input signal

Constructor Summary

Constructors

Constructor	Description
EnvelopeFollower()
EnvelopeFollower(float sampleRate)
EnvelopeFollower(float sample_rate, float attack_time_sec, float release_time_sec)

Method Summary

Modifier and Type	Method	Description
float	get_attack()
float	get_release()
float[]	process(float[] signal_buffer)
void	set_attack(float attack_time_samples)	defines how fast the envelope raise
void	set_attack_sec(float attack_time_sec)	defines how fast the envelope raise
void	set_release(float release_time_samples)	defines how fast the envelope goes down
void	set_release_sec(float release_time_sec)	defines how fast the envelope goes down

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

EnvelopeFollower

public EnvelopeFollower()

EnvelopeFollower

public EnvelopeFollower(float sampleRate)

Parameters:

sampleRate - sample rate of the audio signal.

EnvelopeFollower

public EnvelopeFollower(float sample_rate,
 float attack_time_sec,
 float release_time_sec)

Parameters:

sample_rate - sample rate of the audio signal.

attack_time_sec - defines how fast the envelope raises in seconds

release_time_sec - defines how fast the envelope goes down in seconds

Method Details

set_attack_sec

public void set_attack_sec(float attack_time_sec)

defines how fast the envelope raise

Parameters:

attack_time_sec - attack time in seconds

get_attack

public float get_attack()

Returns:

attack time in samples

set_attack

public void set_attack(float attack_time_samples)

defines how fast the envelope raise

Parameters:

attack_time_samples - attack time in samples

set_release_sec

public void set_release_sec(float release_time_sec)

defines how fast the envelope goes down

Parameters:

release_time_sec - time in seconds

get_release

public float get_release()

Returns:

relase time in samples

set_release

public void set_release(float release_time_samples)

defines how fast the envelope goes down

Parameters:

release_time_samples - time in samples

process

public float[] process(float[] signal_buffer)

Parameters:

signal_buffer - audio signal to be analyzed for envelope

Returns:

process envelope follower signal