{"id":62,"date":"2014-07-02T11:48:00","date_gmt":"2014-07-02T10:48:00","guid":{"rendered":"http:\/\/www.celesteh.com\/blog\/2014\/07\/02\/ping-pong-musically-discovering\/"},"modified":"2015-06-19T00:23:01","modified_gmt":"2015-06-18T23:23:01","slug":"ping-pong-musically-discovering","status":"publish","type":"post","link":"https:\/\/www.celesteh.com\/blog\/2014\/07\/02\/ping-pong-musically-discovering\/","title":{"rendered":"Ping Pong: Musically Discovering Locations"},"content":{"rendered":"<p>this is a video of a talk of a guy stuck in visa-hell. alas, I&#8217;ve been there.<br \/>\nthis is for mobile phone ensembles. devices do not know each other&#8217;s physical position. so performers need not stand in a pre-arranged formation.<br \/>\nThey play sounds at each other to measure location. This is a piece in and of itself.<br \/>\nThey make pairwise distances and then compute three dimension position from the distances.  1 sample error is 1.5cm error.  also, clock issues.<br \/>\nOne device hears a message, the other plays sound back. They have an agreed upon delay, so as to duck the clock issue.  They have an onsent detector that does fast and slow envelopes, like yesterday&#8217;s presentations. The measurements were repeatable and accurate.<br \/>\nThey do vector matrixes to guess positions.<br \/>\nThe ping pong notes are going along a midi score. There are some ways to recover failure.<br \/>\nThere is geometric ambiguity. Background noise creates a problem. As do reflections. They are wondering how to solve this without restorting to harsh noise, but I say embrace it. Why not hardcore mobile phone ensembles?<\/p>\n<h3>Questions<\/h3>\n<p>Will the system work with sounds outside of the human range of hearing?<br \/>\nProbably not with iPhones or iPods, but it <em>could<\/em> work.<br \/>\nWhy use the audio clock instead of the CPU clock?<br \/>\nthe audio clock is much more reliable because its runs in real time. The CPU clock has a lot of jitter.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>this is a video of a talk of a guy stuck in visa-hell. alas, I&#8217;ve been there. this is for mobile phone ensembles. devices do not know each other&#8217;s physical position. so performers need not stand in a pre-arranged formation. They play sounds at each other to measure location. This is a piece in and &hellip; <a href=\"https:\/\/www.celesteh.com\/blog\/2014\/07\/02\/ping-pong-musically-discovering\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Ping Pong: Musically Discovering Locations<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[1],"tags":[54,55],"class_list":["post-62","post","type-post","status-publish","format-standard","hentry","category-uncategorised","tag-live-blog","tag-nime"],"_links":{"self":[{"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/posts\/62","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/comments?post=62"}],"version-history":[{"count":1,"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/posts\/62\/revisions"}],"predecessor-version":[{"id":2254,"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/posts\/62\/revisions\/2254"}],"wp:attachment":[{"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/media?parent=62"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/categories?post=62"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.celesteh.com\/blog\/wp-json\/wp\/v2\/tags?post=62"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}