java.lang.Object | |
↳ | javax.sound.sampled.ReverbType |
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:
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) |
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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 |
Protected Constructors | |||||||||||
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Constructs a new reverb type that has the specified reverberation
parameter values.
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Public Methods | |||||||||||
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Indicates whether the specified object is equal to this reverb type,
returning
true if the objects are identical. | |||||||||||
Obtains the decay time, which is the amount of time over which the
late reflections attenuate to effective zero.
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Returns the early reflection delay time in microseconds.
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Returns the early reflection intensity in decibels.
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Returns the late reflection delay time in microseconds.
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Returns the late reflection intensity in decibels.
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Obtains the name of this reverb type.
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Finalizes the hashcode method.
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Provides a
String representation of the reverb type,
including its name and its parameter settings. |
[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
|
Constructs a new reverb type that has the specified reverberation parameter values.
name | the name of the new reverb type, or a zero-length String |
---|---|
earlyReflectionDelay | the new type's early reflection delay time in microseconds |
earlyReflectionIntensity | the new type's early reflection intensity in dB |
lateReflectionDelay | the new type's late reflection delay time in microseconds |
lateReflectionIntensity | the new type's late reflection intensity in dB |
decayTime | the new type's decay time in microseconds |
Indicates whether the specified object is equal to this reverb type,
returning true
if the objects are identical.
obj | the reference object with which to compare |
---|
true
if this reverb type is the same as
obj
; false
otherwise
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 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 the early reflection intensity in decibels. This is the amplitude attenuation of the first early reflections relative to the direct signal.
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 the late reflection intensity in decibels. This is the amplitude attenuation of the first late reflections relative to the direct signal.
Finalizes the hashcode method.
Provides a String
representation of the reverb type,
including its name and its parameter settings.
The exact contents of the string may vary between implementations of
Java Sound.