Under suitable conditions, reversing the polarity of an audio signal produces an audible but subtle effect. We propose a polarity standard for analog tape recorders and reproducers in the face of several other proposals which are subject to misinterpretation or are used solely as in-house standards. The physical principles of the reproduction process are discussed to clarify the presentation and implementation of our proposed polarity standard.
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https://aes2.org/publications/elibrary-page/?id=11959
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