有些戰略資源要全球統一管理

有些戰略資源要全球統一管理  Some strategic resources need to be managed globally
上次教Jackie  binary code, 就是把一個數字用1，0兩元表現出來, 多加1就進一位. 比如1: 01， 2: 10,  3: 11, 4: 100.  因為信號發送就像開關一樣，有節奏發送，有信號那就是1，沒有就是0. 任何信號，連續的模擬信號，比如每秒採樣sample, 就會有一個強度的值，把這個數值變成binary code, 再按順序送出去. 到接受的地方，再按順序把它變成模擬信號，那一個單向的通訊過程就完成了。比如說鋼琴，每一個鍵是一個頻率，鋼琴是所有樂器中從低到高，頻域最寬的。如果所有琴鍵總和代表頻譜，聲音就是低頻的，只是在左手幾個鍵。光是高頻的，在最右手的鍵. 中間聽不見也看不見的頻率，就是無線電波。如果一個人彈音樂只在一個八度內，也就是頻寬很窄，容量不夠，一定不好聽。象彭媽媽唱歌，可以有兩個八度以上，蕭邦的浪漫曲，左右開弓音域很寬廣的，頻寬很大容量很多，好聽啊。所以海底電纜用光纖呢，因為它可以傳輸很大的容量，跨海整個大陸的上萬兆信息，都是從這些光纜輸送的呢！就像寬闊的高速路，左右可以有multiple lanes, 可以運載很多的信息車輛。不像鐵路，只一條鐵軌. 聲波在傳播中耗能大，所以傳不遠，才幾千hz，容量不大. 要用無線電來傳，就像人坐高鐵那樣. 調頻調幅，長距離的要用短波，也就是很高頻的，象坐飛機了. 衛星通信用的那更是快接近光譜的高頻了。 以前因為沒有共識，就像每個國家地區有自己的電壓和插頭那樣，每個國家自己安排頻道。可是，日子不好過啊，那些小國怎麼在那麼小的國家主權領域裡控制頻道啊？如果有運動物體自帶發射功能，比如戰鬥時候戰機進入別人領空，你怎麼知道那個地區的頻道和你的通訊頻道有沒有互相干擾？所以, 美國FCC, FAA，規定有某些頻域是專門特地留給軍方用的，不管你是什麼商業電台，飛機衛星都不可以用裡邊的頻道！但是除了北美大陸以外呢？所以美國的全球軍事系統還是有問題的，當然收聽是一點問題沒有，所以美軍才會有專門收集各種信息的預警飛機。

Last time I taught Jackie binary code, I showed any number can be represented using 1,0 binary code. For example, 1: 01, 2: 10, 3: 11, 4: 100. Because the signal is sent like a switch, with a rhythm to send. If there is a signal that is 1, no is 0. Any signal, continuous analog signal, such as sampling signal per second, there will be a strength value, turn this value into binary code, then send it out in orders. In the destination turn it into an analog signal by the same orders, and the one-way communication process is completed. For example, the piano, each key is a frequency, the piano has the widest frequency range from the lowest to the highest in all instruments. If the sum of all the keys represents the spectrum, the sound is low frequency, just a few keys in the left hand. The light is high frequency, in the right-handed key. The frequency that can't be seen or heard in the middle is the radio wave. If a person plays music only within one octave, that is, the bandwidth is very narrow and the capacity is not enough, it must be unpleasant. Like Peng mama's singing, there can be two octaves or more. Chopin's romantic songs, the wide-opening range is very wide, and the bandwidth is very large. It's nice. Therefore, the underwater cable uses fiber optics, because it can transmit a large capacity, and the 10 Gigabit information across the entire continent is transmitted from these cables! Just like a wide highway, there are multiple lanes on the left and right, which can carry a lot of information vehicles. Unlike the railway, there is only one railroad track. Sound waves consume a lot of energy in the spread, so they cannot go far, only up to a few thousand hz, the capacity is not big. To use the radio to transmit, just like people sitting on high-speed rail, FM AM frequency modulation. Long distance uses short-wave, that is, very high-frequency, like flying a plane. The satellite communication used is closer to the high frequency of the spectrum. In the past, because there was no consensus, just as each country has its own voltage and plug, each country arranges its own channel. However, the lives are not good, how do the small countries control the channels in such a small country's sovereignty? If there is a moving object with its own launch function, such as when the fighter enters other people's airspace during combat, how do you know if the channel in that area and your communication channel would interfere with each other? Therefore, the US FCC, FAA, stipulates that certain frequency domains are specially reserved for the military use. No matter what commercial radio station you are, aircraft satellites cannot use the channels at that range! But what about the North American continent? Therefore, the global military system in the United States still has problems. Of course, listening is not a problem. Therefore, the US military will have an early warning aircraft that collects various kinds of information.