What do you mean by long signal?

Long signal is a means of communication, which generally refers to the means used to start continuous or intermittent transmission of signals with different lengths in telecommunications. In daily use, such as traffic lights and alarms, long signals are also used. Long signals can be encoded into different signal meanings. For example, in radio communication, different instructions and information can be expressed by coded signals with different lengths, which is a very effective communication means.

Long signals are often used in military and aviation fields. For example, during the tortured World War II, the Allies often used Morse code to transmit information in the form of long and short messages on the European battlefield. This coding method became a legendary example of the allied forces at that time. Similarly, in the modern aviation field, aircraft warning systems often use long signals to express different warning meanings.

Long signals are also widely used in the field of music. As a note in basic music theory, long signal, as a short musical rhythm, is used to convey an aesthetic or sad emotion, and becomes one of the representatives of "long tune" music. In the music of different cultures and countries, long signals also have different symbolic meanings, which are used to convey different cultural connotations and musical artistic conception.