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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Quindar tones ： ウィキペディア英語版 Quindar tones Quindar tones, most often referred to as the "beeps" that were heard during the American Apollo space missions, were a means by which remote transmitters on Earth were turned on and off so that the Capsule communicator (CapCom) could communicate with the crews of the spacecraft. It was a means of in-band signaling to simulate the action of the push to talk-release to listen (often referred to as PTT) button commonly found on two-way radio systems and walkie-talkies. ==The need for Quindar tones== For Mission Control (in Houston, Texas) to stay in continuous contact with the astronauts as they traveled to and from the Moon, NASA used several tracking stations around the world, switching from one to the next as the planet turned. Dedicated telephone lines (a very expensive measure at the time) connected these stations to Houston. NASA had the option to build two separate systems for operating the transmitters - one to carry the audio from the CAPCOM and another to carry the control signal for the PTT button (out-of-band signaling) - but instead chose to combine these two systems together into a single system to reduce the operating cost of the network. The same system was used in Project Gemini and was still in use with half duplex UHF Space Shuttle communications for transmitter RF keying. With modern digital communication systems, Quindar tones are no longer necessary because a single communication line (such as a fiber optic cable) can simultaneously carry multiple communication channels. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quindar tones」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.