{"id":573123,"date":"2019-03-12T21:52:40","date_gmt":"2019-03-13T04:52:40","guid":{"rendered":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/?post_type=msr-research-item&p=573123"},"modified":"2019-05-08T23:42:21","modified_gmt":"2019-05-09T06:42:21","slug":"spectral-manipulation-improves-elevation-perception-with-non-individualized-head-related-transfer-functions","status":"publish","type":"msr-research-item","link":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/publication\/spectral-manipulation-improves-elevation-perception-with-non-individualized-head-related-transfer-functions\/","title":{"rendered":"Spectral manipulation improves elevation perception with non-individualized head-related transfer functions"},"content":{"rendered":"

Spatially rendering sounds using head-related transfer functions
\n(HRTFs) is an important part of creating immersive audio experiences
\nfor virtual reality applications. However, elevation perception
\nremains challenging when generic, non-personalized HRTFs are used.
\nThis study investigated whether digital audio effects applied to a generic
\nset of HRTFs could improve sound localization in the vertical plane.
\nSeveral of the tested effects significantly improved elevation judgment,
\nand trial-by-trial variability in spectral energy between 2 and 10 kHz
\ncorrelated strongly with perceived elevation. Digital audio effects may
\ntherefore be a promising strategy to improve elevation perception where
\npersonalized HRTFs are not available.<\/p>\n

\"\"
\nFigure: (A) Directional bias across subjects observed for each audio effect, pooled across sound type and elevation. UP, MD, and DN responses were assigned a value of +1, 0, and -1, respectively, and directional bias was calculated as the average across all responses in a condition. A positive directional bias would indicate that most stimuli were perceived from above the horizon. The 8 kHz peak, 7 kHz notch, and horizontal blur effects show a significant directional bias relative to the control condition (p<10-3, N=15 subjects, Wilcoxon paired signed-rank test, Bonferroni corrected). (B) Accuracy [% correct] of responses across subjects for each audio effect, pooled across sound type and elevation. The rightmost boxplot shows that an \u201cideal\u201d condition that combined the most accurate effects at each elevation would have achieved a median accuracy of 51%.<\/p>\n

\"\"
\nFigure: (A) Each panel shows the average frequency spectrum of individual trials for each sound type (columns) and each elevation (rows). The data are split by correct (dotted lines) and incorrect (solid lines) responses. Note the divergence in the average frequency spectra between correct and incorrect responses in the 2-10 kHz range. (B) The summed energy between 2 and 10 kHz plotted against mean directional bias. There is a strong positive correlation between spectral energy in this range and perceived elevation above the horizon for both sound types tested (white noise: R=0.84, p<0.01; pink noise: R=0.91, p<0.01, Pearson correlation).<\/p>\n","protected":false},"excerpt":{"rendered":"

Spatially rendering sounds using head-related transfer functions (HRTFs) is an important part of creating immersive audio experiences for virtual reality applications. However, elevation perception remains challenging when generic, non-personalized HRTFs are used. This study investigated whether digital audio effects applied to a generic set of HRTFs could improve sound localization in the vertical plane. Several […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"3","msr_journal":"Journal of the Acoustical Society of America (JASA)","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"EL222","msr_page_range_end":"EL228","msr_series":"","msr_volume":"145","msr_copyright":"2019 Acoustical Society of America","msr_conference_name":"","msr_doi":"","msr_arxiv_id":"","msr_s2_paper_id":"","msr_mag_id":"","msr_pubmed_id":"","msr_other_authors":"","msr_other_contributors":"","msr_speaker":"","msr_award":"","msr_affiliation":"","msr_institution":"","msr_host":"","msr_version":"","msr_duration":"","msr_original_fields_of_study":"","msr_release_tracker_id":"","msr_s2_match_type":"","msr_citation_count_updated":"","msr_published_date":"2019-3-12","msr_highlight_text":"","msr_notes":"","msr_longbiography":"","msr_publicationurl":"","msr_external_url":"","msr_secondary_video_url":"","msr_conference_url":"","msr_journal_url":"","msr_s2_pdf_url":"","msr_year":0,"msr_citation_count":0,"msr_influential_citations":0,"msr_reference_count":0,"msr_s2_match_confidence":0,"msr_microsoftintellectualproperty":true,"msr_s2_open_access":false,"msr_s2_author_ids":[],"msr_pub_ids":[],"msr_hide_image_in_river":0,"footnotes":""},"msr-research-highlight":[],"research-area":[243062],"msr-publication-type":[193715],"msr-publisher":[],"msr-focus-area":[],"msr-locale":[268875],"msr-post-option":[],"msr-field-of-study":[],"msr-conference":[],"msr-journal":[],"msr-impact-theme":[],"msr-pillar":[],"class_list":["post-573123","msr-research-item","type-msr-research-item","status-publish","hentry","msr-research-area-audio-acoustics","msr-locale-en_us"],"msr_publishername":"","msr_edition":"","msr_affiliation":"","msr_published_date":"2019-3-12","msr_host":"","msr_duration":"","msr_version":"","msr_speaker":"","msr_other_contributors":"","msr_booktitle":"","msr_pages_string":"","msr_chapter":"","msr_isbn":"","msr_journal":"Journal of the Acoustical Society of America (JASA)","msr_volume":"145","msr_number":"","msr_editors":"","msr_series":"","msr_issue":"3","msr_organization":"","msr_how_published":"","msr_notes":"","msr_highlight_text":"","msr_release_tracker_id":"","msr_original_fields_of_study":"","msr_download_urls":"","msr_external_url":"","msr_secondary_video_url":"","msr_longbiography":"","msr_microsoftintellectualproperty":1,"msr_main_download":"","msr_publicationurl":"","msr_doi":"","msr_publication_uploader":[{"type":"file","viewUrl":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/wp-content\/uploads\/2019\/03\/DAFx_JASAEL_pdf_archiveJASMANvol_145iss_3EL222_1.pdf","id":"585838","title":"dafx_jasael_pdf_archivejasmanvol_145iss_3el222_1","label_id":"243132","label":0},{"type":"url","viewUrl":"false","id":"false","title":"https:\/\/asa.scitation.org\/doi\/10.1121\/1.5093641","label_id":"243109","label":0}],"msr_related_uploader":"","msr_citation_count":0,"msr_citation_count_updated":"","msr_s2_paper_id":"","msr_influential_citations":0,"msr_reference_count":0,"msr_arxiv_id":"","msr_s2_author_ids":[],"msr_s2_open_access":false,"msr_s2_pdf_url":null,"msr_attachments":[{"id":585838,"url":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/wp-content\/uploads\/2019\/05\/DAFx_JASAEL_pdf_archiveJASMANvol_145iss_3EL222_1.pdf"}],"msr-author-ordering":[{"type":"text","value":"Vani G. 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