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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.sound.sampled; |
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/** |
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* The <code>ReverbType</code> class provides methods for |
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* accessing various reverberation settings to be applied to |
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* an audio signal. |
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* <p> |
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* Reverberation simulates the reflection of sound off of |
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* the walls, ceiling, and floor of a room. Depending on |
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* the size of the room, and how absorbent or reflective the materials in the |
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* room's surfaces are, the sound might bounce around for a |
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* long time before dying away. |
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* <p> |
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* The reverberation parameters provided by <code>ReverbType</code> consist |
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* of the delay time and intensity of early reflections, the delay time and |
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* intensity of late reflections, and an overall decay time. |
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* Early reflections are the initial individual low-order reflections of the |
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* direct signal off the surfaces in the room. |
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* The late Reflections are the dense, high-order reflections that characterize |
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* the room's reverberation. |
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* The delay times for the start of these two reflection types give the listener |
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* a sense of the overall size and complexity of the room's shape and contents. |
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* The larger the room, the longer the reflection delay times. |
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* The early and late reflections' intensities define the gain (in decibels) of the reflected |
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* signals as compared to the direct signal. These intensities give the |
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* listener an impression of the absorptive nature of the surfaces and objects |
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* in the room. |
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* The decay time defines how long the reverberation takes to exponentially |
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* decay until it is no longer perceptible ("effective zero"). |
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* The larger and less absorbent the surfaces, the longer the decay time. |
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* <p> |
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* The set of parameters defined here may not include all aspects of reverberation |
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* as specified by some systems. For example, the Midi Manufacturer's Association |
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* (MMA) has an Interactive Audio Special Interest Group (IASIG), which has a |
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* 3-D Working Group that has defined a Level 2 Spec (I3DL2). I3DL2 |
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* supports filtering of reverberation and |
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* control of reverb density. These properties are not included in the JavaSound 1.0 |
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* definition of a reverb control. In such a case, the implementing system |
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* should either extend the defined reverb control to include additional |
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* parameters, or else interpret the system's additional capabilities in a way that fits |
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* the model described here. |
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* <p> |
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* If implementing JavaSound on a I3DL2-compliant device: |
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* <ul> |
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* <li>Filtering is disabled (high-frequency attenuations are set to 0.0 dB) |
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* <li>Density parameters are set to midway between minimum and maximum |
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* </ul> |
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* <p> |
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* The following table shows what parameter values an implementation might use for a |
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* representative set of reverberation settings. |
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* <p> |
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* |
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* <b>Reverberation Types and Parameters</b> |
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* <p> |
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* <table border=1 cellpadding=5 summary="reverb types and params: decay time, late intensity, late delay, early intensity, and early delay"> |
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* |
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* <tr> |
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* <th>Type</th> |
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* <th>Decay Time (ms)</th> |
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* <th>Late Intensity (dB)</th> |
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* <th>Late Delay (ms)</th> |
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* <th>Early Intensity (dB)</th> |
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* <th>Early Delay(ms)</th> |
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* </tr> |
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* |
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* <tr> |
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* <td>Cavern</td> |
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* <td>2250</td> |
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* <td>-2.0</td> |
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* <td>41.3</td> |
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* <td>-1.4</td> |
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* <td>10.3</td> |
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* </tr> |
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* |
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* <tr> |
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* <td>Dungeon</td> |
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* <td>1600</td> |
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* <td>-1.0</td> |
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* <td>10.3</td> |
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* <td>-0.7</td> |
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* <td>2.6</td> |
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* </tr> |
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* |
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* <tr> |
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* <td>Garage</td> |
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* <td>900</td> |
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* <td>-6.0</td> |
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* <td>14.7</td> |
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* <td>-4.0</td> |
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* <td>3.9</td> |
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* </tr> |
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* |
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* <tr> |
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* <td>Acoustic Lab</td> |
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* <td>280</td> |
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* <td>-3.0</td> |
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* <td>8.0</td> |
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* <td>-2.0</td> |
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* <td>2.0</td> |
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* </tr> |
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* |
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* <tr> |
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* <td>Closet</td> |
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* <td>150</td> |
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* <td>-10.0</td> |
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* <td>2.5</td> |
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* <td>-7.0</td> |
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* <td>0.6</td> |
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* </tr> |
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* |
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* </table> |
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* |
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* @author Kara Kytle |
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* @since 1.3 |
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*/ |
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public class ReverbType { |
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/** |
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* Descriptive name of the reverb type.. |
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*/ |
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private String name; |
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/** |
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* Early reflection delay in microseconds. |
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*/ |
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private int earlyReflectionDelay; |
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/** |
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* Early reflection intensity. |
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*/ |
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private float earlyReflectionIntensity; |
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/** |
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* Late reflection delay in microseconds. |
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*/ |
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private int lateReflectionDelay; |
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/** |
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* Late reflection intensity. |
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*/ |
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private float lateReflectionIntensity; |
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/** |
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* Total decay time |
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*/ |
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private int decayTime; |
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/** |
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* Constructs a new reverb type that has the specified reverberation |
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* parameter values. |
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* @param name the name of the new reverb type, or a zero-length <code>String</code> |
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* @param earlyReflectionDelay the new type's early reflection delay time in microseconds |
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* @param earlyReflectionIntensity the new type's early reflection intensity in dB |
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* @param lateReflectionDelay the new type's late reflection delay time in microseconds |
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* @param lateReflectionIntensity the new type's late reflection intensity in dB |
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* @param decayTime the new type's decay time in microseconds |
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*/ |
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protected ReverbType(String name, int earlyReflectionDelay, float earlyReflectionIntensity, int lateReflectionDelay, float lateReflectionIntensity, int decayTime) { |
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this.name = name; |
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this.earlyReflectionDelay = earlyReflectionDelay; |
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this.earlyReflectionIntensity = earlyReflectionIntensity; |
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this.lateReflectionDelay = lateReflectionDelay; |
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this.lateReflectionIntensity = lateReflectionIntensity; |
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this.decayTime = decayTime; |
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} |
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/** |
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* Obtains the name of this reverb type. |
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* @return the name of this reverb type |
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* @since 1.5 |
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*/ |
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public String getName() { |
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return name; |
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} |
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/** |
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* Returns the early reflection delay time in microseconds. |
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* This is the amount of time between when the direct signal is |
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* heard and when the first early reflections are heard. |
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* @return early reflection delay time for this reverb type, in microseconds |
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*/ |
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public final int getEarlyReflectionDelay() { |
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return earlyReflectionDelay; |
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} |
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/** |
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* Returns the early reflection intensity in decibels. |
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* This is the amplitude attenuation of the first early reflections |
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* relative to the direct signal. |
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* @return early reflection intensity for this reverb type, in dB |
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*/ |
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public final float getEarlyReflectionIntensity() { |
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return earlyReflectionIntensity; |
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} |
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/** |
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* Returns the late reflection delay time in microseconds. |
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* This is the amount of time between when the first early reflections |
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* are heard and when the first late reflections are heard. |
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* @return late reflection delay time for this reverb type, in microseconds |
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*/ |
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public final int getLateReflectionDelay() { |
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return lateReflectionDelay; |
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} |
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/** |
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* Returns the late reflection intensity in decibels. |
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* This is the amplitude attenuation of the first late reflections |
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* relative to the direct signal. |
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* @return late reflection intensity for this reverb type, in dB |
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*/ |
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public final float getLateReflectionIntensity() { |
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return lateReflectionIntensity; |
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} |
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/** |
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* Obtains the decay time, which is the amount of time over which the |
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* late reflections attenuate to effective zero. The effective zero |
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* value is implementation-dependent. |
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* @return the decay time of the late reflections, in microseconds |
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*/ |
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public final int getDecayTime() { |
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return decayTime; |
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} |
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/** |
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* Indicates whether the specified object is equal to this reverb type, |
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* returning <code>true</code> if the objects are identical. |
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* @param obj the reference object with which to compare |
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* @return <code>true</code> if this reverb type is the same as |
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* <code>obj</code>; <code>false</code> otherwise |
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*/ |
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public final boolean equals(Object obj) { |
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return super.equals(obj); |
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} |
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/** |
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* Finalizes the hashcode method. |
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*/ |
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public final int hashCode() { |
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return super.hashCode(); |
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} |
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/** |
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* Provides a <code>String</code> representation of the reverb type, |
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* including its name and its parameter settings. |
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* The exact contents of the string may vary between implementations of |
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* Java Sound. |
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* @return reverberation type name and description |
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*/ |
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public final String toString() { |
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//$$fb2001-07-20: fix for bug 4385060: The "name" attribute of class "ReverbType" is not accessible. |
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//return (super.toString() + ", early reflection delay " + earlyReflectionDelay + |
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return (name + ", early reflection delay " + earlyReflectionDelay + |
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" ns, early reflection intensity " + earlyReflectionIntensity + |
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" dB, late deflection delay " + lateReflectionDelay + |
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" ns, late reflection intensity " + lateReflectionIntensity + |
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" dB, decay time " + decayTime); |
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} |
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} // class ReverbType |