There are inner demons, terminate the transaction
In the movie "Infernal Affairs", the Liu Jianming ( Andy Lau ornaments) as a police undercover operation found in a gang undercover Yeung-Jen Chen ( Tony Leung ornaments) and yellow police inspector ( Anthony Wong ornaments) to communicate through Morse code, area after an emergency mass SMS "there is the ghost, to terminate the transaction" to avoid the gang leader was arrested.
By moving map can be seen 黄警督and 陈永仁only by tapping a finger to complete the communication is not it amazing?
Well, not exactly , in the movie 陈永仁of the window there is a signal transmission device
To achieve such a smooth communication, it must Morse code very familiar with tables and communications, and hand speed to be fast.
Morse code
Morse code (also translated as Morse code, English: Morse code) on when the code signal is off when one kind of
To express different letters, numbers and punctuation marks through different arrangement order. With Samuel Morse invented by the Americans Al Feder Weir in 1836.
Morse code is an early form of digital communications technology, which relies on a series of dots and dashes to transmit coded information, which includes five code:
- Point (*): 1 (read
“滴”dit, time occupy 1t) - Plan (-): 111 (read
“嗒”dah, occupied time 3T) - Internal character pauses (between the dots and dashes): 0 (time occupied 1t)
- Pause between characters : 000 (Time occupied 3t)
- Pauses between words : 0000000 (Time occupied 7t)
Point length (i.e. the length of time above t) determines the speed transmitter
for example
We now want to send “M O R S E(空格) C O D E”( Morse code ) This word look-up table shows, it should be like this
—— ——— ·—· ··· · / —·—· ——— —·· ·
Corresponding packet should be as follows ( 滴expressed tap , ▢represents a pause )
▢▢▢ DDD DDD DDD ▢ ▢ ▢ DDD DDD DDD ▢ ▢ ▢▢▢ drip drip drip ▢▢▢ ▢ ▢ drip drip drip ▢▢▢▢▢▢▢ ▢▢▢ DDD DDD ▢ ▢ ▢ drip drip ▢▢▢ DDD ▢ ▢ DDD DDD
Telegraph
We often see war appear in the movie telegraph operator, wants to send a telegram to know each word corresponding to the input format by looking up a code table.
It can be a key with a tap 点、划and an intermediate 停顿.
sos
The SOS distress signal ···---···( )
In 1912, the famous Titanic cruise ship when the first flight in distress, send a CQD (British Marconi radio company decided to use the CQD as the
ship distress signal), but D ( ) —··is easy to confuse the other letters, around the vessel did not realize It is a distress signal, no quick rescue , only when it sank fast new distress signal SOS ( ) ···———···transmitters. After the sinking of the Titanic, SOS was only widely accepted and used
In fact, although the SOS signal already formulated in 1906, but the British radio operators rarely use SOS signal, they prefer the old CQD distress signal.
Titanic's chief radio officer John George Phillips has been sent CQD distress signal until the subordinate radio operator Harold Brad advised him: “发送SOS吧，这是新的调用信号，这也可能是你最后的机会来发送它了！”Then Philip inclusion in the traditional CQD SOS signal distress signal.
Distress signal is received until the SS Californian was only the next morning, because she did not monitor radio 24 hours.
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