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An Artificial Stereophonic Effect Obtained from a Single Audio Signal

In 1954, H. Lauridsen reported an experiment which gave a remarkable stereophonic effect using a single input signal. The signal was fed to both ears once directly in phase, and a second time (delayed by 50 to 150 msec) in anti-phase. This experiment is recognized as resulting in two different intensity vs frequency responses in the paths to the two ears, namely, two interlaced comb filters. The presence of such different responses, rather than the time delay, is postulated, from the results of the experiments described here, as the essential prerequisite that stereophonic effects be obtained from a single input signal.

JAES Volume 6 Issue 2 pp. 74-79; April 1958
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