java 音频文件的频谱分析程序

Light Development Spectrum Analyzer Component (readme.txt, January 20, 2005) Contents -------- - What is the Light Development Spectrum Analyzer? - Requirements - Contents of the distribution package - Installation - Usage - Author - Credits - Copyrights - License What is the Light Development Spectrum Analyzer? ------------------------------------------------ The Light Development Spectrum Analyzer is a component that can be incorporated into user interfaces of applications wishing to visualize audio data in real time. It displays the sound pressure for a range of audio frequencies over time as produced by an audio data stream currently being played. Requirements ------------ The component relies on the KJ DSP package and the Light Development Java Library. Both are included in the distribution package as files kj_dsp.jar and ldlib.jar The component is written in Java. Applications that wish to incorporate the component require a Java Runtime Environment Version 5. The JRE is not included in the distribution package, it can be obtained free of charge at http://www.java.com Contents of the distribution package ------------------------------------ This package (file ldsa.zip) has the following contents ldsa.jar - spectrum analyzer component classes kj_dsp - dsp package required by the component ldlib.jar - library classes required by the component readme.txt - this file license.txt - usage license for all content doc/api - api documentation directory src - source code directory for ldsa.jar Installation ------------ To install the Spectrum Analyzer component, extract the contents of file ldsa.zip to an arbitrary directory. The file ldsa.zip can be deleted after successful installation. Usage ----- To use the component, add files ldsa.jar, kj_dsp.jar and ldlib.jar to the classpath of your application. Three parts are needed to implement the component as follows: 1. a Player object to play audio 2. a SpectrumAnalyzer object to visualize decoded audio data 3. a KJSignalProcessor object to synchronize the decoded audio stream with the visualization The following code lines demonstrate the usage: // create an instance of KJDigitalSignalProcessingAudioDataConsumer KJDigitalSignalProcessingAudioDataConsumer synchronizer = new KJDigitalSignalProcessingAudioDataConsumer(4096, 10); // create an instance of the spectrum analyzer component SpectrumAnalyzer analyzer = new SpectrumAnalyzer(20, 12); // add the analyzer to the synchronizer as a KJDigitalSignalProcessor synchronizer.add(analyzer); // create a Player object Player player = new Player(); // add the analyzer to the Player as a listener to player events player.addPlayerListener(analyzer); . . //when the player fires a START event, start the synchronizer too case Player.PLAYING: synchronizer.start(player.getSourceDataLine()); . . //when the player fires PAUSE or STOP, stop the synchronizer case Player.STOPPED_PLAY: synchronizer.stop(); . . Once the components are created as shown above, the spectrum analyzer component simply is added to the user interface, i.e it is added to a Swing component such as a JPanel whcih in turn is shown on a JFrame, etc. Please see the API docs and the source codes to find out more. You can use the Light Development application PlaylistEditor to find more details about how to use the component as well. Author ------ The Light Devlopment Spectrum Analyzer is created and maintained by Ulrich Hilger Gartenstrasse 15 65830 Kriftel Germany Internet http://www.ligtdev.com e-mail info@lightdev.com Credits ------- Many thanks go to Kris Fudalewski for his KJ DSP package and for his hints during creation of the spectrum analyzer component. Copyrights ---------- All material is copyright 2004, 2005 Ulrich Hilger except for the KJ DSP package which is copyright Kris Fudalewski. License ------- All parts in this distribution package may be used and distributed under the terms and conditions of the GNU General Public License. Please see file license.txt included in this package for terms and conditions of the license.