{"id":1022,"date":"2013-03-09T07:10:55","date_gmt":"2013-03-09T07:10:55","guid":{"rendered":"https:\/\/ibex.tech\/resources\/?p=1022"},"modified":"2022-02-18T15:05:17","modified_gmt":"2022-02-18T15:05:17","slug":"audio-beat-detect","status":"publish","type":"post","link":"https:\/\/ibex.tech\/resources\/geek-area\/electronics\/audio\/audio-beat-detect","title":{"rendered":"Audio Beat Detect"},"content":{"rendered":"<h4>\nA working audio beat detect circuit for a microcontroller using a microphone input<br \/>\n<\/h4>\n<p>\n<a href=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/audio_beat_detect.png\" rel=\"noopener\" style=\"\" target=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" class=\"size-full wp-image-1025 alignnone\" height=\"455\" src=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/audio_beat_detect.png\" style=\"\" title=\"audio_beat_detect\" width=\"964\" srcset=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/audio_beat_detect.png 964w, https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/audio_beat_detect-300x141.png 300w\" sizes=\"auto, (max-width: 964px) 100vw, 964px\" \/><\/a>\n<\/p>\n<p>\nThis circuit uses a digital pot to allow the microcontoller to automatically adjust the gain of the circuit to suit the ambient audio volume, but you could replace this with a standard pot if this isn&#39;t needed.&nbsp; The low pass filter is a copy of Graham Mitchell&#39;s nifty solution from this page:\n<\/p>\n<p>\n<a href=\"http:\/\/digital-diy.com\/forum\/electronics-projects\/sound-to-light-beat-detection-t1220-10.html\" target=\"_blank\" rel=\"noopener\">http:\/\/digital-diy.com\/forum\/electronics-projects\/sound-to-light-beat-detection-t1220-10.html<\/a>\n<\/p>\n<p>\nThe circuit works well and allows the microcontroller to detect beats by looking for filtered atod reading peeks of a similar amplitude to the pre-filtered atod reading peeks. The following are some captures taken from the 2 test points using a signal generator feeding into an amplified speaker:\n<\/p>\n<p>\n<a href=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/audio_beat_detect_captures.png\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" class=\"alignnone size-full wp-image-1026\" height=\"966\" src=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/audio_beat_detect_captures.png\" title=\"audio_beat_detect_captures\" width=\"872\" srcset=\"https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/audio_beat_detect_captures.png 872w, https:\/\/ibex.tech\/resources\/wp-content\/uploads\/sites\/3\/audio_beat_detect_captures-270x300.png 270w\" sizes=\"auto, (max-width: 872px) 100vw, 872px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A working audio beat detect circuit for a microcontroller using a microphone input This circuit uses a digital pot to allow the microcontoller to automatically adjust the gain of the circuit to suit the ambient audio volume, but you could replace this with a standard pot if this isn&#39;t needed.&nbsp; The low pass filter is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-1022","post","type-post","status-publish","format-standard","hentry","category-audio"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/1022","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/comments?post=1022"}],"version-history":[{"count":5,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/1022\/revisions"}],"predecessor-version":[{"id":2502,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/1022\/revisions\/2502"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/media?parent=1022"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/categories?post=1022"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/tags?post=1022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}