Echo 2 最好的java web application 开发框架。所有源代码和例子。-Echo 2 the best java web application development framework. All source code and examples.

采用回声隐藏法在音频中嵌入秘密信息，其中echo为经典回声核，echo2为双极性回声核，echo3为双向回声核-Echo hiding method using secret information is embedded in the audio, in which the echo echo classic nuclear, echo2 bipolar echo nuclear, echo3 bidirectional echo nuclear