一款消回音芯片的参数设置指导，费力得到。参数多，难调。后来换成了OKI的消回音芯片，供参考给懂声音特性的高手-Echo cancellation parameters of a chip set guidance, effort be. Parameters more difficult to reach. The news was replaced by OKI echo chip, for reference to understand the sound characteristics o

pocketgps-map software for the gps location and configuation