做到在互连网的语音通信功能，使用g.729压缩，在 北京 -------- 重庆 间测试过，一端是长城宽带。一端是56k modem 拨号上网。语音比较清晰，但有一点停吨现象。-do in the Internet voice communications, using G.729 compression, in Beijing -------- between Chongqing tested, the end of the Great Wall Broadband. One extreme

单音多频信号的产生和识别，采用FFT变换。应用于电话拨号。是学习数字信号处理的大作业。-Tone multi-frequency signal generation and recognition, the use of FFT transform. Applies to telephone dial-up. Digital Signal Processing is the study of large operations.

电话语音，可进行拨号连接，类似网络电话系统。-Telephone voice, dial-up connection can be similar to Internet telephony systems.