雙語暢銷書《艾倫圖靈傳》第7章:運轉起來(44)
The idea of generating a key for speech encipherment in this way was not entirely new.
The X-system was not always used with one-time gramophone records for the key.
X系統也不總是使用一次性的錄音密鑰，There was an alternative, called 'the threshing machine'.
他們有一個替代的機器，稱爲打穀機。
But this only had to produce a stream of digits at a rate of 300 a second, and was only used for testing or for low-status signals.
但它的速度只有每秒300個數字，只用於測試或者低級別的信號。The Delilah was much more demanding.
黛麗拉的要求比這更高。The generator had to be electronic, and the basic unit he used was the 'multivibrator'—a pair of valves possessing the property of locking into an oscillation between 'on' and 'off, with a length which would be some integral multiple of a basic period.
產生器必須是電子的，它的基本組件是多頻振盪器，這是一對電子管，在"開"和"關"之間來回擺動，時長是一個基本週期的整數倍。His key generator made use of the outputs of eight such multivibrators, each locked into a different mode of oscillation.
圖靈的密鑰產生器利用了八個多頻振盪器，它們分別以不同的模式擺動。But that was just the beginning.
這只是開始。These outputs were fed into several circuits with non-linear elements, which combined them in a complicated way.
這些多頻振盪器的輸出，會輸入到幾個非線性電路，通過複雜的方式，把它們混合到一起。He had worked out a circuit design which ensured that the energy of the output would be spread as evenly as possible over the whole frequency range, and he explained to Donald Bayley with the aid of Fourier theory that this would endow the amplitude of the resulting output with the necessary degree of 'randomness' for cryptographic security.
圖靈設計了一種電路，能夠確保輸出儘可能地平均。他向唐納德·貝利解釋說，正是傅利葉理論使輸出的振幅具有隨機性。
