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Most of his time, however, was spent in one particular 'cell' which had the responsibility of trying to crack speech encipherment systems which had been proposed.
然而，他的大部分时间，还是待在一个特定的隔间中，那里的工作是破解现有的语音加密系统。
He made an impression from the start, for within an hour of arrival he had solved a problem.
艾伦刚坐下来一个小时，就解决了一个问题，因此让同行们大为惊叹。
It involved a scrambling system in which time segments were permuted, by means of nine magnetic heads simultaneously reading a magnetic tape.
这是一个扰乱式的加密系统，它用9个磁头同时对磁带进行读写，从而将时间片段打乱顺序。
'That ought to give you 945 codes,' said Alan when this was explained, 'It's only 9x7x5x3.'
当他们向艾伦解释这套系统时，艾伦立刻说："应该有945种组合，就是9×7×5×3而已。"
It had taken one of their technicians a week to work it out.
而他们的一位技术人员，花了一周才算出这个数。
For his first week, Alan acquainted himself with all the projects on which they were working, and became particularly keen on taking up one of them himself.
在第一周，艾伦熟悉了他们正在进行的所有项目，并打算承接其中一个项目。
This was the challenge presented by an RCA engineer, who had devised a system in which a speech signal would be multiplied by a key signal.
一位工程师提出了一个想法，将语音信号乘上一个密钥信号。
It presented quite an unusual problem.
这是一个很不寻常的问题。
On 23 January, Alan announced he had begun to think of a way of attacking it, and then he came in after the weekend convinced of its possibilities.
1月23日，艾伦开始思考解决方案，随后他在周末来到办公室，确定了该方案的可行性。
His idea involved the use of the Vocoder.
他的想法是使用声码器。
