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 Reflections 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
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 Reflections 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
0.6equalsclj
(equals this obj)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 - java.lang.Object
returns: true if this reverb type is the same as
obj; false otherwise - boolean
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 - `java.lang.Object` returns: true if this reverb type is the same as obj; false otherwise - `boolean`
get-decay-timeclj
(get-decay-time this)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 - int
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 - `int`
get-early-reflection-delayclj
(get-early-reflection-delay this)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 - int
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 - `int`
get-early-reflection-intensityclj
(get-early-reflection-intensity this)Returns the early reflection intensity in decibels. This is the amplitude attenuation of the first early reflections relative to the direct signal.
returns: early reflection intensity for this reverb type, in dB - float
Returns the early reflection intensity in decibels. This is the amplitude attenuation of the first early reflections relative to the direct signal. returns: early reflection intensity for this reverb type, in dB - `float`
get-late-reflection-delayclj
(get-late-reflection-delay this)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 - int
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 - `int`
get-late-reflection-intensityclj
(get-late-reflection-intensity this)Returns the late reflection intensity in decibels. This is the amplitude attenuation of the first late reflections relative to the direct signal.
returns: late reflection intensity for this reverb type, in dB - float
Returns the late reflection intensity in decibels. This is the amplitude attenuation of the first late reflections relative to the direct signal. returns: late reflection intensity for this reverb type, in dB - `float`
get-nameclj
(get-name this)Obtains the name of this reverb type.
returns: the name of this reverb type - java.lang.String
Obtains the name of this reverb type. returns: the name of this reverb type - `java.lang.String`
hash-codeclj
(hash-code this)Finalizes the hashcode method.
returns: a hash code value for this object. - int
Finalizes the hashcode method. returns: a hash code value for this object. - `int`
to-stringclj
(to-string this)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.
returns: reverberation type name and description - java.lang.String
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. returns: reverberation type name and description - `java.lang.String`
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