{"id":2091,"date":"2014-05-07T07:40:51","date_gmt":"2014-05-07T06:40:51","guid":{"rendered":"http:\/\/audioblog.sonatura.com\/?p=2091"},"modified":"2014-05-07T07:48:34","modified_gmt":"2014-05-07T06:48:34","slug":"ballet-nocturne","status":"publish","type":"post","link":"https:\/\/audioblog.sonatura.com\/?p=2091","title":{"rendered":"Ballet nocturne"},"content":{"rendered":"<p><a href=\"https:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2014\/05\/Systeme_stereo_div_freq.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-2090\" title=\"Systeme_stereo_div_freq\" src=\"https:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2014\/05\/Systeme_stereo_div_freq-300x195.jpg\" alt=\"\" width=\"300\" height=\"195\" srcset=\"https:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2014\/05\/Systeme_stereo_div_freq-300x195.jpg 300w, https:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2014\/05\/Systeme_stereo_div_freq.jpg 941w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>Il y a d\u00e9j\u00e0 six ans que notre ami Antoine Griboval nous \u00e9patait avec un enregistrement de chauve-souris en rendu stereo gr\u00e2ce \u00e0 deux d\u00e9tecteurs d\u2019ultrasons h\u00e9t\u00e9rodynes qui ram\u00e8nent au champ audible les ultrasons non perceptibles \u00e0 l\u2019ou\u00efe humaine\u00a0: <a href=\"https:\/\/audioblog.sonatura.com\/?p=300\">https:\/\/audioblog.sonatura.com\/?p=300<\/a><br \/>\nAyant acquis un premier puis un second d\u00e9tecteur par division de fr\u00e9quences des plus rudimentaires (<em>BATBOX<\/em> \u00ab\u00a0BATon\u00a0\u00bb), j\u2019ai commenc\u00e9 \u00e0 utiliser ce syst\u00e8me pour inventorier les chiropt\u00e8res de ma r\u00e9gion. Le syst\u00e8me de division de fr\u00e9quences a pour avantage par rapport \u00e0 l\u2019h\u00e9t\u00e9rodyne, de n\u2019\u00eatre pas restreint \u00e0 des bandes de fr\u00e9quences s\u00e9par\u00e9es et de rester ouvert \u00e0 toutes les gammes d\u2019\u00e9missions en m\u00eame temps, depuis les derni\u00e8res fr\u00e9quences per\u00e7ues par l\u2019oreille humaine jusqu\u2019aux ultrasons les plus \u00e9lev\u00e9s des chiropt\u00e8res vers 120 KHz, ce qui permet, pendant une attente, de d\u00e9tecter la pr\u00e9sence de n\u2019importe quel ph\u00e9nom\u00e8ne ultrasonore orthopt\u00e8res compris\u2026 La stereo qui ajoute une dimension spatiale, sp\u00e9cialement au casque, permet de distinguer les individus les uns des autres ce qui permet de les d\u00e9nombrer et surtout de distinguer les \u00e9missions parfois tr\u00e8s similaires qui se m\u00e9langent donc davantage avec le syst\u00e8me de division de fr\u00e9quences. Je vous propose donc ici une nouvelle version de cette exp\u00e9rience stereo\u00a0: une Pipistrelle commune (<em>Pipistrellus pipistrellus<\/em>) puis probablement une Pipistrelle de Kh\u00fcl (<em>P. khulii<\/em>) ou de Nathusius (<em>P. nathusii<\/em>) [cette s\u00e9quence trop br\u00e8ve et trop confuse ne m\u2019a pas permis de la distinguer \u00e0 coup s\u00fbr, m\u00eame d\u2019une \u00e9ventuelle S\u00e9rotine (<em>Eptesicus serotinus<\/em>)].<\/p>\n<p>Voil\u00e0 une sc\u00e8ne typique au sortir d\u2019un village, juste au cr\u00e9puscule, moment o\u00f9 les pipistrelles sont les plus actives \u00e0 la sortie des g\u00eetes diurnes. Le dispositif se trouvait sous les frondaisons d\u2019un grand et vieux ch\u00eane. Cet individu tout d\u2019abord isol\u00e9 \u00a0me tournoyait autour avant d\u2019\u00eatre rejoint par de nombreuses autres cong\u00e9n\u00e8res venues chasser au-dessus de la rivi\u00e8re. Avec la fra\u00eecheur retombant, les insectes se dispersent et ce ballet rapproch\u00e9 s\u2019estompe. [enregistrement en \u00ab\u00a0ligne\u00a0\u00bb sur Olympus LS-11 puis filtrage graves et aig\u00fcs]<\/p>\n<div class=\"powerpress_player\" id=\"powerpress_player_266\"><audio class=\"wp-audio-shortcode\" id=\"audio-2091-1\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"http:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2014\/05\/Ballet_nocturne.mp3?_=1\" \/><a href=\"http:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2014\/05\/Ballet_nocturne.mp3\">http:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2014\/05\/Ballet_nocturne.mp3<\/a><\/audio><\/div><p class=\"powerpress_links powerpress_links_mp3\" style=\"margin-bottom: 1px !important;\">Podcast: <a href=\"http:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2014\/05\/Ballet_nocturne.mp3\" class=\"powerpress_link_pinw\" target=\"_blank\" title=\"Play in new window\" onclick=\"return powerpress_pinw('https:\/\/audioblog.sonatura.com\/?powerpress_pinw=2091-podcast');\" rel=\"nofollow\">Play in new window<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Il y a d\u00e9j\u00e0 six ans que notre ami Antoine Griboval nous \u00e9patait avec un enregistrement de chauve-souris en rendu stereo gr\u00e2ce \u00e0 deux d\u00e9tecteurs d\u2019ultrasons h\u00e9t\u00e9rodynes qui ram\u00e8nent au champ audible les ultrasons non perceptibles \u00e0 l\u2019ou\u00efe humaine\u00a0: https:\/\/audioblog.sonatura.com\/?p=300&nbsp;&hellip; <a href=\"https:\/\/audioblog.sonatura.com\/?p=2091\">finish&nbsp;reading&nbsp;Ballet nocturne<\/a><\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,9,3],"tags":[101,100,102],"class_list":["post-2091","post","type-post","status-publish","format-standard","hentry","category-a-identifier","category-bioacoustique","category-technique","tag-chiropteres","tag-division-de-frequences","tag-ultrasons"],"_links":{"self":[{"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=\/wp\/v2\/posts\/2091","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2091"}],"version-history":[{"count":5,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=\/wp\/v2\/posts\/2091\/revisions"}],"predecessor-version":[{"id":2097,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=\/wp\/v2\/posts\/2091\/revisions\/2097"}],"wp:attachment":[{"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2091"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2091"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2091"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}