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The Twin-Tone Distortion Meter: A New Approach

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The principles of twin-tone generation and sideband detection are described, and an unusual method of obtaining the distortion-related sidebands from the tape output signal is discussed. This method has many advantages over the more conventional methods of suppressing the original twin-tone components in the spectrum. The accuracy and limitations of the new method are also given.

JAES Volume 31 Issue 5 pp. 332-340; May 1983
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AES - Audio Engineering Society