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android 利用speex 降低声音噪音，回声消除demo，提高音频播放质量

Once you've learned to program, you run into real-world problems that require more than a programming language alone to solve. Data Structures and Algorithms in Java is a gentle immersion into the most practical ways to make data do what you want it to do. Lafore's relaxed mastery of the techniques comes through as though he's chatting with the reader over lunch, gesturing toward appealing graphics. The book starts at the very beginning with data structures and algorithms, but assumes the reader understands a language such as Java or C++. Examples are given in Java to keep them free of explicit pointers.

里面收集了C语言中常遇到的问题，不管是初学者还是有一定基础的编程人员，该材料都会起到一定的帮助