{"@context":"http://iiif.io/api/presentation/3/context.json","id":"https://arsc.aviaryplatform.com/iiif/6m3319sg9d/manifest","type":"Manifest","label":{"en":["Azimuth Investigations"]},"logo":"https://d9jk7wjtjpu5g.cloudfront.net/organizations/logo_images/000/000/019/original/ARSC_Full_Logo_RGB_K.jpg?1605438091","metadata":[{"label":{"en":["Agent"]},"value":{"en":["Richard L. Hess (Presenter)","Dennis D. Rooney (Chair)","Michael Biel (Videographer)","Leah Biel (Videographer)"]}},{"label":{"en":["Date"]},"value":{"en":["2016-05-13 (Created)"]}},{"label":{"en":["Format"]},"value":{"en":["Video","Audio","Slides"]}},{"label":{"en":["Description"]},"value":{"en":["\u003cp\u003eFor several years, Richard L. Hess has been investigating the subtleties of tape head azimuth and related parameters that affect playback quality. Post-transfer time alignment has also been investigated. This is a progress report, presented in the hope that others may find it useful and build on it. The work includes a spreadsheet that uses angular azimuth error, track width, stereo track spacing, and speed to calculate a predicted response curve for each individual track as well as the two tracks summed. Two primary findings become evident: (1) Post-transfer “azimuth align-ment” (actually time alignment) is useful, but not a substitute for correctly adjusting head playback azimuth. (2) Post-transfer time alignment (especially dynamic time alignment) can make a substantial difference between a good and bad transfer from two-track playback, due to the signal-to-noise improvement of summing the channels when reproducing a mono cassette with a stereo head (there is rarely a good reason to do that with reel-to-reel tape). Without taking care of the azimuth-induced errors, this summation often produces unacceptable high-frequency roll off. The spreadsheet also demonstrates the difference in sensitivity of different track configurations to both single-track azimuth error as well as summed-stereo azimuth error.\u003c/p\u003e"]}},{"label":{"en":["Language"]},"value":{"en":["English"]}},{"label":{"en":["Publisher"]},"value":{"en":["Association for Recorded Sound Collections"]}},{"label":{"en":["Rights Statement"]},"value":{"en":["\u003cp\u003eCopyright Association for Recorded Sound Collections\u003c/p\u003e"]}},{"label":{"en":["Video Editor"]},"value":{"en":["Nathan Georgitis"]}}],"summary":{"en":["\u003cp\u003eFor several years, Richard L. Hess has been investigating the subtleties of tape head azimuth and related parameters that affect playback quality. Post-transfer time alignment has also been investigated. This is a progress report, presented in the hope that others may find it useful and build on it. The work includes a spreadsheet that uses angular azimuth error, track width, stereo track spacing, and speed to calculate a predicted response curve for each individual track as well as the two tracks summed. Two primary findings become evident: (1) Post-transfer \u0026ldquo;azimuth align-ment\u0026rdquo; (actually time alignment) is useful, but not a substitute for correctly adjusting head playback azimuth. (2) Post-transfer time alignment (especially dynamic time alignment) can make a substantial difference between a good and bad transfer from two-track playback, due to the signal-to-noise improvement of summing the channels when reproducing a mono cassette with a stereo head (there is rarely a good reason to do that with reel-to-reel tape). Without taking care of the azimuth-induced errors, this summation often produces unacceptable high-frequency roll off. The spreadsheet also demonstrates the difference in sensitivity of different track configurations to both single-track azimuth error as well as summed-stereo azimuth error.\u003c/p\u003e"]},"requiredStatement":{"label":{"en":["Attribution"]},"value":{"en":["\u003cp\u003eCopyright Association for Recorded Sound Collections\u003c/p\u003e"]}},"provider":[{"id":"https://arsc.aviaryplatform.com/aboutus","type":"Agent","label":{"en":["Association for Recorded Sound Collections"]},"homepage":[{"id":"https://arsc.aviaryplatform.com/","type":"Text","label":{"en":["Association for Recorded Sound Collections"]},"format":"text/html"}],"logo":[{"id":"https://d9jk7wjtjpu5g.cloudfront.net/organizations/logo_images/000/000/019/original/ARSC_Full_Logo_RGB_K.jpg?1605438091","type":"Image"}]}],"thumbnail":[{"id":"https://d9jk7wjtjpu5g.cloudfront.net/collection_resource_files/thumbnails/000/097/638/small/open-uri20200922-6764-giu8g7_1600817795.jpg?1600803432","type":"Image","format":"image/jpeg"}],"items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29750/file/97638","type":"Canvas","label":{"en":["Media File 1 of 2 - open-uri20200922-6764-giu8g7.mp4"]},"duration":1496.064,"width":640,"height":360,"thumbnail":[{"id":"https://d9jk7wjtjpu5g.cloudfront.net/collection_resource_files/thumbnails/000/097/638/small/open-uri20200922-6764-giu8g7_1600817795.jpg?1600803432","type":"Image","format":"image/jpeg"}],"items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29750/file/97638/content/1","type":"AnnotationPage","items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29750/file/97638/content/1/annotation/1","type":"Annotation","motivation":"painting","body":{"id":"https://aviary-p-arsc.s3.wasabisys.com/collection_resource_files/resource_files/000/097/638/original/open-uri20200922-6764-giu8g7.mp4?1600803389","type":"Video","format":"video/mp4","duration":1496.064,"width":640,"height":360},"target":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29750/file/97638","metadata":[]}]}],"annotations":[]},{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29750/file/255771","type":"Canvas","label":{"en":["Media File 2 of 2 - ARSC_conf_2016_Hess_audio.mp3"]},"duration":1492.14844,"width":640,"height":360,"thumbnail":[{"id":"https://d9jk7wjtjpu5g.cloudfront.net/public/images/audio-default.png","type":"Image","format":"image/png"}],"items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29750/file/255771/content/1","type":"AnnotationPage","items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29750/file/255771/content/2/annotation/1","type":"Annotation","motivation":"painting","body":{"id":"https://aviary-p-arsc.s3.wasabisys.com/collection_resource_files/resource_files/000/255/771/original/ARSC_conf_2016_Hess_audio.mp3?1730752025","type":"Audio","format":"audio/mpeg","duration":1492.14844,"width":640,"height":360},"target":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29750/file/255771","metadata":[]}]}],"annotations":[]}]}