Knocking on the table by hand reflects Morse code (also called Morse code) by knocking on the table at different time intervals. Morse cipher consists of two basic signals and different intervals: short point signal. And read "di"; Press and hold the long signal "-"for a certain time and read "Da". Interval time: down,1t; ; Answer, 3t; Tick-tock,1t; ; Between letters, 3t; Between the lines, 5t.

Morse code (also translated as Morse code) is an intermittent signal coding, which represents different English letters, numbers and punctuation marks through different arrangement orders. It was invented in 1837, and the inventor is controversial, whether it is American Samuel Morse or Alfred Weil. ?

Morse code is an early form of digital communication, but it is different from modern binary code, which only uses zero and one or two states. Its code includes five types: dot, dash, pause between dot dashes, short pause between characters, moderate pause between words and long pause between sentences.

Extended data:

The application of Morse cipher;

1. When using Moore's password light for help, it is defined as "-"when the light is long and "."When the light is insufficient, you can send out various messages through the switch of the flashlight, such as asking for help.

2. If the lights are displayed according to the law of "short bright dark short bright dark short bright dark short bright dark long bright dark short bright dark short bright dark short bright short bright short bright short", then it means SOS.

3. Because the MOR code of SOS is:-,the lighting code can be implemented according to the above provisions. This coding is actually very simple, three short three long three short.

4. In addition to lights, distress signals can also be made by sound (two different sounds). This way of asking for help is something we should all know, and maybe we can use it when necessary.

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