Using dlsym to extract a hidden symbol returns NULL. 使用dlsym提取一个隐藏的符号将会返回NULL。
A method of signal mode detection and time domain frame synchronization is proposed, which can be used in DAB/ DMB system. This method is based on energy self-adapted detection of null symbol. 针对数字多媒体广播(DAB/DMB)系统,提出了一种可实际应用的信号模式检测和时域帧同步技术,该方法是基于信号空符号的能量自适应检测方法(Energy-BasedDetection,EBD)。