{"@context":"http://iiif.io/api/presentation/3/context.json","id":"https://arsc.aviaryplatform.com/iiif/dr2p55dx8m/manifest","type":"Manifest","label":{"en":["Digital De-emphasis Filters in Gramophone Recording Digitization"]},"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":["Peter Kuhnle (Presenter)","David Seubert (Chair)","Michael Biel (Videographer)","Leah Biel (Videographer)"]}},{"label":{"en":["Date"]},"value":{"en":["2016-05-13 (Created)"]}},{"label":{"en":["Format"]},"value":{"en":["Video","Audio"]}},{"label":{"en":["Description"]},"value":{"en":["\u003cp\u003eTo provide the intended tonal balance, the reproduction of Gramophone recordings requires the use of suitable de-emphasis filters. Often, the emphasis curve applied when cutting the master cannot be securely asserted, or its definition requires iterative research work. Digitizing a non-de-emphasised version preserves the unaltered off-carrier signal which offers choice for applying adequate de-emphasis later on, and it provides better results when removing click and crackle artefacts for access copies. Using digital de-emphasis filters instead of analog circuits provides several advantages. Digital filters are free of component tolerance. With their parameters documented, de-emphasis processing is completely reversible. Thus the handling of dual, filtered and unfiltered versions becomes obsolete, leading to simplified workflows. Arbitrary filter characteristics, including those that only exist in tabular format, may be modeled and applied instantaneously. Providing the filter characteristics as metadata leads to an intrinsically documented process. Simplified implementations may not meet their analog pendants properly. It is however possible to design digital de-emphasis filters matching their analog prototypes perfectly in amplitude- and phase response. This is given within the Sampling Theorem, thus up to 80 kHz, using a sampling rate of 192 kHz. Digital de-emphasis can be made as good as the analog archetype, or even outperform it. Using digital de-emphasis filters improves and simplifies the work of the archivist. In combination with high-quality linear pre-amplifiers and A/D converters, gramophone digitization in surpassing quality may be realized.\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\u003eTo provide the intended tonal balance, the reproduction of Gramophone recordings requires the use of suitable de-emphasis filters. Often, the emphasis curve applied when cutting the master cannot be securely asserted, or its definition requires iterative research work. Digitizing a non-de-emphasised version preserves the unaltered off-carrier signal which offers choice for applying adequate de-emphasis later on, and it provides better results when removing click and crackle artefacts for access copies. Using digital de-emphasis filters instead of analog circuits provides several advantages. Digital filters are free of component tolerance. With their parameters documented, de-emphasis processing is completely reversible. Thus the handling of dual, filtered and unfiltered versions becomes obsolete, leading to simplified workflows. Arbitrary filter characteristics, including those that only exist in tabular format, may be modeled and applied instantaneously. Providing the filter characteristics as metadata leads to an intrinsically documented process. Simplified implementations may not meet their analog pendants properly. It is however possible to design digital de-emphasis filters matching their analog prototypes perfectly in amplitude- and phase response. This is given within the Sampling Theorem, thus up to 80 kHz, using a sampling rate of 192 kHz. Digital de-emphasis can be made as good as the analog archetype, or even outperform it. Using digital de-emphasis filters improves and simplifies the work of the archivist. In combination with high-quality linear pre-amplifiers and A/D converters, gramophone digitization in surpassing quality may be realized.\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/000/097/656/small/open-uri20200922-6764-1urn47s_1600818092.jpg?1600803714","type":"Image","format":"image/jpeg"}],"items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/97656","type":"Canvas","label":{"en":["Media File 1 of 3 - open-uri20200922-6764-1urn47s.mp4"]},"duration":1381.58933,"width":640,"height":360,"thumbnail":[{"id":"https://d9jk7wjtjpu5g.cloudfront.net/collection_resource_files/thumbnails/000/097/656/small/open-uri20200922-6764-1urn47s_1600818092.jpg?1600803714","type":"Image","format":"image/jpeg"}],"items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/97656/content/1","type":"AnnotationPage","items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/97656/content/1/annotation/1","type":"Annotation","motivation":"painting","body":{"id":"https://aviary-p-arsc.s3.wasabisys.com/collection_resource_files/resource_files/000/097/656/original/open-uri20200922-6764-1urn47s.mp4?1600803684","type":"Video","format":"video/mp4","duration":1381.58933,"width":640,"height":360},"target":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/97656","metadata":[]}]}],"annotations":[]},{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/255776","type":"Canvas","label":{"en":["Media File 2 of 3 - ARSC_conf_2016_Kuhnle_audio.mp3"]},"duration":1393.69288,"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/29758/file/255776/content/1","type":"AnnotationPage","items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/255776/content/2/annotation/1","type":"Annotation","motivation":"painting","body":{"id":"https://aviary-p-arsc.s3.wasabisys.com/collection_resource_files/resource_files/000/255/776/original/ARSC_conf_2016_Kuhnle_audio.mp3?1730753236","type":"Audio","format":"audio/mpeg","duration":1393.69288,"width":640,"height":360},"target":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/255776","metadata":[]}]}],"annotations":[]},{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/255775","type":"Canvas","label":{"en":["Media File 3 of 3 - ARSC_conf_2016_Kuhnle_qa_audio.mp3"]},"duration":666.96638,"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/29758/file/255775/content/1","type":"AnnotationPage","items":[{"id":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/255775/content/3/annotation/1","type":"Annotation","motivation":"painting","body":{"id":"https://aviary-p-arsc.s3.wasabisys.com/collection_resource_files/resource_files/000/255/775/original/ARSC_conf_2016_Kuhnle_qa_audio.mp3?1730753235","type":"Audio","format":"audio/mpeg","duration":666.96638,"width":640,"height":360},"target":"https://arsc.aviaryplatform.com/collections/1145/collection_resources/29758/file/255775","metadata":[]}]}],"annotations":[]}]}