Subject: From: LASZLO Toth <tothl(at)INF.U-SZEGED.HU> Date: Thu, 5 Feb 1998 16:50:00 MET>From tothl Thu Feb 5 16:50:04 +0100 1998 remote from inf.u-szeged.hu Date: Thu, 5 Feb 1998 16:50:04 +0100 (MET) From: Toth Laszlo <tothl(at)inf.u-szeged.hu> X-Sender: tothl(at)csilla To: Multiple recipients of list AUDITORY <AUDITORY(at)VM1.MCGILL.CA> Subject: Re: effect of phase on pitch Message-ID: <Pine.SV4.3.91.980205162120.6492F-100000(at)csilla> MIME-Version: 1.0 Received: from inf.u-szeged.hu by inf.u-szeged.hu; Thu, 5 Feb 1998 16:50 MET Content-Type: TEXT/PLAIN; charset=US-ASCII Content-Length: 1754 On Thu, 5 Feb 1998, R. Parncutt wrote: > ... > Straightforward evidence of the ear's insensitivity to phase in the sounds > of the real human environment has been provided by Heinbach (1988). He > reduced natural sounds including speech (with or without background noise > and multiple speakers) and music to their spectral contours, which he called > the part-tone-time-pattern. In the process, he completely discarded all > phase information. The length of the spectrum analysis window was carefully > tuned to that of the ear, which depends on frequency. Finally, he > resynthesized the original sounds, using random or arbitrary phase > relationships. The resynthesized sounds were perceptually indistinguishable > from the originals, even though their phase relationships had been shuffled. > "Perceptually indistinguishable" means here only that their PITCHes were perceptually indistingushable, am I right? Considering other aspects, changing the phase relationships definitely has effects on sound quality. In phase vocoders, for example, uncorrect decoding of phases results in really annoying artifacts. ****************************************************************************** * Toth Laszlo * * * Hungarian Academy of Sciences * "In our life there's if * * Research Group on Artificial Intelligence * In our beliefs there's lie * * * In our business there's sin * * e-mail: tothl(at)inf.u-szeged.hu * In our bodies there's die" * * http://www.inf.u-szeged.hu/~tothl * * ******************************************************************************