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JavaTM 2 Platform Std. Ed. v1.3.1 |
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javax.sound.sampled
Class ReverbType
java.lang.Object | +--javax.sound.sampled.ReverbType
- public class ReverbType
- extends Object
The ReverbType class provides methods for
accessing various reverberation settings to be applied to
an audio signal.
Reverberation simulates the reflection of sound off of the walls, ceiling, and floor of a room. Depending on the size of the room, and how absorbent or reflective the materials in the room's surfaces are, the sound might bounce around for a long time before dying away.
The reverberation parameters provided by ReverbType consist
of the delay time and intensity of early reflections, the delay time and
intensity of late reflections, and an overall decay time.
Early reflections are the initial individual low-order reflections of the
direct signal off the surfaces in the room.
The late Relections are the dense, high-order reflections that characterize
the room's reverberation.
The delay times for the start of these two reflection types give the listener
a sense of the overall size and complexity of the room's shape and contents.
The larger the room, the longer the reflection delay times.
The early and late reflections' intensities define the gain (in decibels) of the reflected
signals as compared to the direct signal. These intensities give the
listener an impression of the absorptive nature of the surfaces and objects
in the room.
The decay time defines how long the reverberation takes to exponentially
decay until it is no longer perceptible ("effective zero").
The larger and less absorbent the surfaces, the longer the decay time.
The set of parameters defined here may not include all aspects of reverberation as specified by some systems. For example, the Midi Manufacturer's Association (MMA) has an Interactive Audio Special Interest Group (IASIG), which has a 3-D Working Group that has defined a Level 2 Spec (I3DL2). I3DL2 supports filtering of reverberation and control of reverb density. These properties are not included in the JavaSound 1.0 definition of a reverb control. In such a case, the implementing system should either extend the defined reverb control to include additional parameters, or else interpret the system's additional capabilities in a way that fits the model described here.
If implementing JavaSound on a I3DL2-compliant device:
- Filtering is disabled (high-frequency attenuations are set to 0.0 dB)
- Density parameters are set to midway between minimum and maximum
The following table shows what parameter values an implementation might use for a representative set of reverberation settings.
Reverberation Types and Parameters
| Type | Decay Time (ms) | Late Intensity (dB) | Late Delay (ms) | Early Intensity (dB) | Early Delay(ms) |
|---|---|---|---|---|---|
| Cavern | 2250 | -2.0 | 41.3 | -1.4 | 10.3 |
| Dungeon | 1600 | -1.0 | 10.3 | -0.7 | 2.6 |
| Garage | 900 | -6.0 | 14.7 | -4.0 | 3.9 |
| Acoustic Lab | 280 | -3.0 | 8.0 | -2.0 | 2.0 |
| Closet | 150 | -10.0 | 2.5 | -7.0 | 0.6 |
- Since:
- 1.3
| Constructor Summary | |
protected |
ReverbType(String name,
int earlyReflectionDelay,
float earlyReflectionIntensity,
int lateReflectionDelay,
float lateReflectionIntensity,
int decayTime)
Constructs a new reverb type that has the specified reverberation parameter values. |
| Method Summary | |
boolean |
equals(Object obj)
Indicates whether the specified object is equal to this reverb type, returning true if the objects are identical. |
int |
getDecayTime()
Obtains the decay time, which is the amount of time over which the late reflections attenuate to effective zero. |
int |
getEarlyReflectionDelay()
Returns the early reflection delay time in microseconds. |
float |
getEarlyReflectionIntensity()
Returns the early reflection intensity in microseconds. |
int |
getLateReflectionDelay()
Returns the late reflection delay time in microseconds. |
float |
getLateReflectionIntensity()
Returns the late reflection intensity in microseconds. |
int |
hashCode()
Finalizes the hashcode method. |
String |
toString()
Provides a String representation of the reverb type,
including its name and its parameter settings. |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
ReverbType
protected ReverbType(String name, int earlyReflectionDelay, float earlyReflectionIntensity, int lateReflectionDelay, float lateReflectionIntensity, int decayTime)
- Constructs a new reverb type that has the specified reverberation
parameter values.
- Parameters:
name- the name of the new reverb type, or a zero-lengthStringearlyReflectionDelay- the new type's early reflection delay time in microsecondsearlyReflectionIntensity- the new type's early reflection intensity in dBlateReflectionDelay- the new type's late reflection delay time in microsecondslateReflectionIntensity- the new type's late reflection intensity in dBdecayTime- the new type's decay time in microseconds
| Method Detail |
getEarlyReflectionDelay
public final int getEarlyReflectionDelay()
- Returns the early reflection delay time in microseconds.
This is the amount of time between when the direct signal is
heard and when the first early reflections are heard.
- Returns:
- early reflection delay time for this reverb type, in microseconds
getEarlyReflectionIntensity
public final float getEarlyReflectionIntensity()
- Returns the early reflection intensity in microseconds.
This is the amplitude attenuation of the first early reflections
relative to the direct signal.
- Returns:
- early reflection intensity for this reverb type, in microseconds
getLateReflectionDelay
public final int getLateReflectionDelay()
- Returns the late reflection delay time in microseconds.
This is the amount of time between when the first early reflections
are heard and when the first late reflections are heard.
- Returns:
- late reflection delay time for this reverb type, in microseconds
getLateReflectionIntensity
public final float getLateReflectionIntensity()
- Returns the late reflection intensity in microseconds.
This is the amplitude attenuation of the first late reflections
relative to the direct signal.
- Returns:
- late reflection intensity for this reverb type, in microseconds
getDecayTime
public final int getDecayTime()
- Obtains the decay time, which is the amount of time over which the
late reflections attenuate to effective zero. The effective zero
value is implementation-dependent.
- Returns:
- the decay time of the late reflections, in microseconds
equals
public final boolean equals(Object obj)
- Indicates whether the specified object is equal to this reverb type,
returning
trueif the objects are identical.- Parameters:
obj- the reference object with which to compare- Returns:
trueif this reverb type is the same asobj;falseotherwise
hashCode
public final int hashCode()
- Finalizes the hashcode method.
- Following copied from class:
java.lang.Object- Returns:
- a hash code value for this object.
- See Also:
Object.equals(java.lang.Object),Hashtable
toString
public final String toString()
- Provides a
Stringrepresentation of the reverb type, including its name and its parameter settings. The exact contents of the string may vary between implementations of Java Sound.- Returns:
- reverberation type name and description
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JavaTM 2 Platform Std. Ed. v1.3.1 |
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