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In page Scrambler:

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The first voice scramblers were invented at Bell Labs in the period just before World War II. These sets consisted of electronics that could mix two signals or alternatively "subtract" one signal back out again. The two signals were provided by a telephone and a record player[citation needed]. A matching pair of records was produced, each containing the same recording of noise[citation needed]. The recording was played into the telephone, and the mixed signal was sent over the wire[citation needed]. The noise was then subtracted out at the far end using the matching record, leaving the original voice signal intact[citation needed]. Eavesdroppers would hear only the noisy signal, unable to understand the voice[citation needed].