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资源说明：A collection of c, java, and shell programs that do various operations on sound files.
Written by Michael Patterson in the fall of 2009. First project in Computer Science 229 at Iowa State University. I recieved a 1900/1900 on it. This project can be made simply by typing "make". All the files are in this directory and all the java files are in the default package. The c files needed for the jni are compiled into the "fourier_lib.so" file. This should be loaded dynamically, so there is no need to change any file paths. In the makefile I link to the correct Java libraries for the jni. They work for both my pc and pyrite, but I've also included the normal path in the comment in case something goes wrong. I've tested the Makefile on pyrite so it should work fine. One issue I ran into was that java doesn't have any unsigned int data type. The best solution I could come up with was to cast to doubles, and then if the value is negative, I add 2 times Max_Int_Value to it to get it back to the right value. Also, after testing the dtmf program, I made some changes from the dtmf description in the assignment sheet. I got much more reliable results when I compared the frequency component to 2.5x the value 3.5% away rather than 5x. I also check that the component is > 500. I've tested this and it's been properly picking up button presses that meet the specs given in the assignment.
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