29:null 2a:["$","title",null,{"children":"Varispeed BPM Calculator | Andrew P | Observable"}] 2f:[] 2d:{"id":"8ff229e9198f4021","slug":"varispeed-bpm-calculator","title":"Varispeed BPM Calculator","thumbnail":"9150a18dd5d2abd132a657286b10af14818a44165b2cfca7406431cff3b2ffbb","access_level":"public","create_time":"$D2021-10-02T13:14:24.790Z","update_time":"$D2021-10-02T14:58:42.612Z","view_time":null,"first_public_time":"$D2021-10-02T15:02:14.695Z","has_unpublished_edits":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"448956d8a4a43eb5","login":"piratus","name":"Andrew P","avatar_url":"https://avatars-next.observableusercontent.com/10979fe53e8362346572a5770112fd1a4efba4fb09c4182a6652b6f09e12f9e4","tier":"starter_2024"},"version":242,"publish_version":242,"role":null,"authored":false,"authors":[{"type":"individual","id":"4873f825e6d817f7","login":"piratus","name":"Andrew P","avatar_url":"https://avatars-next.observableusercontent.com/10979fe53e8362346572a5770112fd1a4efba4fb09c4182a6652b6f09e12f9e4","tier":null}],"members":[{"type":"individual","id":"4873f825e6d817f7","login":"piratus","name":"Andrew P","avatar_url":"https://avatars-next.observableusercontent.com/10979fe53e8362346572a5770112fd1a4efba4fb09c4182a6652b6f09e12f9e4","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":true,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"title":"Varispeed BPM Calculator","cells":[{"id":0,"value":"# Varispeed BPM Calculator","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":162,"value":"If you want slow down or speed up a song by a semitone, what would the resulting speed be?","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":6,"value":"viewof BPM = Inputs.range([10, 320], {\n value: 120,\n label: \"Initial BPM\",\n step: 0.1\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":13,"value":"viewof OFFSET = Inputs.range([-12, 12], {\n value: -1,\n label: \"Semitones offset\",\n step: 1\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":17,"value":"{\n const res = getBPMWithOffset(BPM, OFFSET);\n\n return html`${printBPM(\n BPM\n )} × 2^{(^${OFFSET}st/₁₂)} =\n
\n${printBPM(\n res\n )}
which also equals ×${round(\n res / BPM\n )} speed ratio`;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":105,"value":"/**\n * @param {number} bpm Initial BPM\n * @param {number} offset Offset in Semitones\n * @returns {number} resulting BPM\n **/\nfunction getBPMWithOffset(bpm, offset) {\n return bpm * Math.pow(2, offset / 12.0);\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":125,"value":"---","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":64,"value":"html``","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":184,"value":"function round(value) {\n return Math.round(value * 10000) / 10000;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":85,"value":"function printBPM(value) {\n return html`${round(value)}bpm`;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":92,"value":"function printSt(value) {\n const sign = Math.sign(value) < 0 ? \"-\" : \"+\";\n return html`${sign}${Math.abs(value)}st`;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W2f","stdlib":"1","titling":"auto"}} 2e:"$2d:body"