{"title":"\"Revitalizing Classic Illusions: Shepard-Tone Sequences and Shepard–Risset Glissandi, With Various Modifications\"","authors":"Andrew V. Frane","doi":"10.17743/jaes.2022.0132","DOIUrl":null,"url":null,"abstract":"The Shepard-tone sequence and Shepard–Risset glissando are classic auditory illusions in which pitch seems to inexhaustibly ascend or descend. Such stimuli have been used in scientific research, as well as for artistic purposes. This paper demonstrates several variations of those illusions, some of which do not appear to have been previously discussed in the literature. Most notably, hybrids of the two illusions are demonstrated, in which discrete Shepard-tone steps are connected by continuous glissandi. It is shown, using a sample of 91 listeners, that such hybrids can disambiguate the perceived direction of motion between two Shepard tones that are a tritone apart, thus overriding what has been called the tritone paradox . In other demonstrations, multiple layers of monaural and binaural beats are embedded into a Shepard– Risset glissando to produce Risset rhythms . Audio files for these and other examples are provided and discussed. Two original MATLAB functions (and equivalent functions in R) are also provided, which can be used to replicate the examples and explore additional variations.","PeriodicalId":50008,"journal":{"name":"Journal of the Audio Engineering Society","volume":null,"pages":null},"PeriodicalIF":1.1000,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Audio Engineering Society","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.17743/jaes.2022.0132","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ACOUSTICS","Score":null,"Total":0}
引用次数: 0
Abstract
The Shepard-tone sequence and Shepard–Risset glissando are classic auditory illusions in which pitch seems to inexhaustibly ascend or descend. Such stimuli have been used in scientific research, as well as for artistic purposes. This paper demonstrates several variations of those illusions, some of which do not appear to have been previously discussed in the literature. Most notably, hybrids of the two illusions are demonstrated, in which discrete Shepard-tone steps are connected by continuous glissandi. It is shown, using a sample of 91 listeners, that such hybrids can disambiguate the perceived direction of motion between two Shepard tones that are a tritone apart, thus overriding what has been called the tritone paradox . In other demonstrations, multiple layers of monaural and binaural beats are embedded into a Shepard– Risset glissando to produce Risset rhythms . Audio files for these and other examples are provided and discussed. Two original MATLAB functions (and equivalent functions in R) are also provided, which can be used to replicate the examples and explore additional variations.
期刊介绍:
The Journal of the Audio Engineering Society — the official publication of the AES — is the only peer-reviewed journal devoted exclusively to audio technology. Published 10 times each year, it is available to all AES members and subscribers.
The Journal contains state-of-the-art technical papers and engineering reports; feature articles covering timely topics; pre and post reports of AES conventions and other society activities; news from AES sections around the world; Standards and Education Committee work; membership news, patents, new products, and newsworthy developments in the field of audio.