============================================
初次使用GNURadio，寻找控件：
| 控件 | 路径 |
|---|---|
| QT Message Edit Box | GUI Widgets - QT |
| Embedded Python Block | Misc |
| PDU to Tagged Stream | Message Tools |
| Protocol Formatter | Packet Operators |
| Tagged Stream Mux | Stream Tag tools |
| Vector Source | Misc |
| Stream to Tagged Stream | Stream Tag tools |
| Repack Bits | Byte Operators |
| Repeat | Stream Operators |
| Chunks to Symbols | Symnol Coding |
| VCO | waveform Generators |
| Audio Sink | Audio |
