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Is SOS emergency signal two long and one short or two short and one long rhythms?
There are many kinds of distress signals, the following are sounds and lights:
The tapping sound is represented by the length of the interval,
If knock (stop for 3 seconds) knock (stop for 3 seconds) represents three lengths,
Knock (stop 1 sec) Knock (stop 1 sec) Knock (stop 1 sec) means three short.
The length of sound is expressed by the time of light.
For example, bright-off-bright-off-bright-off-bright-off-bright-off-indicates three lengths,
On-off-on-off-on-off-on-off-off-means three short circuits.
Generally, the length is about three times shorter, but there is no specific interval, as long as the rhythm is obviously different.
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