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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: RE: Absolute Phase; I Can't Hear It posted by Karma16 on March 15, 2009 at 15:35:09:
Actually, I was just trying to be helpful when I listed some of the reasons for not hearing absolute polarity. Believe them or not, I don't care. Perhaps someone will them useful. Otherwise, my post was a waste of time.
If you Google "monaural phase" you will find a number of interesting references that show how the ear can be sensitive to phase, despite 19th century theories to the contrary. Here is one example from work done at Bell Labs:
One of my abiding interests has been the monaural phase sensitivity of human hearing. Already at Bell, in the 1950s, I had built a "phase organ" that generated periodic signals with 31 Fourier components with phase angles adjustable to either 0 or 180 degrees. The resulting tone complexes showed a wide variety of musical timbers many of them reminiscent of vowels. This finding contradicts Ohm's Law of Acoustics, which says that the ear is essentially phase deaf. These experiments gave me the idea of fabricating synthetic speech signals with a fixed flat power spectrum but a time-varying phase spectrum. This idea lay dormant for a long time until Hans Werner Strube and I revived it and demonstrated that, indeed, intelligible speech could be generated from phase changes alone, leaving the power spectrum fixed.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: Absolute Phase; I Can't Hear It - Tony Lauck 03/15/0918:47:45 03/15/09 (0)
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