{"id":439,"date":"2016-01-13T20:17:49","date_gmt":"2016-01-13T20:17:49","guid":{"rendered":"http:\/\/mitat.tuu.fi\/?p=439"},"modified":"2016-01-13T20:18:21","modified_gmt":"2016-01-13T20:18:21","slug":"some-audio-code","status":"publish","type":"post","link":"http:\/\/mitat.tuu.fi\/?p=439","title":{"rendered":"Low pass filter and MIDI note to frequency in C"},"content":{"rendered":"<p><code><br \/>\nfloat lp(float x, float a,float* mem)<br \/>\n{<br \/>\n\t*mem += a * (x - *mem);<br \/>\n\treturn *mem;<br \/>\n}<br \/>\n<\/code><\/p>\n<p><code><br \/>\nfloat midifreq(int note)<br \/>\n{<br \/>\n\treturn (1 << ((note - 69) \/ 12)) * 440.0;\n}\n<\/code><\/p>\n<p><a href=\"https:\/\/github.com\/sooda\/stm32f4_sequencer\/blob\/master\/src\/synth.c\" title=\"source\"><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>float lp(float x, float a,float* mem) { *mem += a * (x &#8211; *mem); return *mem; } float midifreq(int note) { return (1<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-439","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/posts\/439","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=439"}],"version-history":[{"count":2,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/posts\/439\/revisions"}],"predecessor-version":[{"id":441,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=\/wp\/v2\/posts\/439\/revisions\/441"}],"wp:attachment":[{"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=439"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=439"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/mitat.tuu.fi\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=439"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}