{"id":300,"date":"2008-09-06T15:57:20","date_gmt":"2008-09-06T14:57:20","guid":{"rendered":"http:\/\/audioblog.sonatura.com\/?p=300"},"modified":"2021-05-27T21:02:43","modified_gmt":"2021-05-27T20:02:43","slug":"chauves-souris-en-stereo","status":"publish","type":"post","link":"https:\/\/audioblog.sonatura.com\/?p=300","title":{"rendered":"Chauves-souris en st\u00e9r\u00e9o&#8230;"},"content":{"rendered":"<p>Vous avez sans doute d\u00e9j\u00e0 entendu une transcription audible des cris ultrasoniques que les chauves-souris \u00e9mettent pour se rep\u00e9rer ou localiser leurs proies.<br \/>\nPlusieurs techniques existent pour ce faire.<br \/>\nIci c\u2019est le mode dit h\u00e9t\u00e9rodyne qui a \u00e9t\u00e9 choisi car il respecte le rythme d\u2019\u00e9missions des cris en offrant une sonorit\u00e9 somme toute assez agr\u00e9able. Afin de pr\u00e9server celle ci, le son a \u00e9t\u00e9 laiss\u00e9 brut, tel qu\u2019on peut l\u2019entendre sur le terrain.<br \/>\nRappelons toutefois que ce n\u2019est qu\u2019une interpr\u00e9tation de ce que nos oreilles ne peuvent entendre !<br \/>\nSur une id\u00e9e et avec les conseils de <a title=\"Kalerne\" href=\"http:\/\/www.kalerne.net\">Yannick<\/a> (merci \u00e0 lui !), quelques cris ont \u00e9t\u00e9 collect\u00e9s en st\u00e9r\u00e9o, ce qui apporte \u00e9videmment un vrai plus en terme d\u2019espace sonore&#8230;<br \/>\n<img decoding=\"async\" src=\"https:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2008\/09\/matos.photo.jpg\" alt=\"matos\" \/><br \/>\nQuestion technique rien d\u2019extraordinaire, deux d\u00e9tecteurs d\u2019ultrasons (Pettersson D 230 et D 240X) sont r\u00e9gl\u00e9s sur la fr\u00e9quence d\u2019\u00e9mission moyenne des esp\u00e8ces pr\u00e9sentes (ex : 45 000 Hz pour la pipistrelle commune) et sont reli\u00e9s aux entr\u00e9es d\u2019un enregistreur Zoom H4 gr\u00e2ce \u00e0 deux c\u00e2bles \u00ab bricoles \u00bb. Les d\u00e9tecteurs sont indiff\u00e9remment dispos\u00e9s en XY ou en ORTF large et orient\u00e9s selon le terrain verticalement, horizontalement ou en position interm\u00e9diaire. Mais la nuit tombe, il est temps de tendre l&rsquo;oreille et de se pr\u00e9parer \u00e0 \u00e9couter \u00ab l&rsquo;inaudible \u00bb &#8230;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2008\/09\/couchant.photo.jpg\" alt=\"Couchant\" \/><\/p>\n<p>On entend d\u2019abord quelques pipistrelles qui passent et repassent le long d\u2019un chemin de campagne.<br \/>\nLes brusques et courtes acc\u00e9l\u00e9rations de rythme des cris, appel\u00e9s \u00ab buzz \u00bb, correspondent a? des approches de proies, en principe suivies de capture !<br \/>\nUn petit canal nous permet ensuite d\u2019assister a? la chasse des murins de Daubenton, ils survolent l\u2019eau \u00e0 quelques dizaines de cm. Vous noterez le caract\u00e8re \u00ab sec \u00bb des sons en comparaison de l\u2019aspect \u00ab humide \u00bb de ceux des pipistrelles.<br \/>\nEnfin, noctules et s\u00e9rotines nous donnent un petit concert en bordure d\u2019\u00e9tang.<\/p>\n<p>Antoine, d\u00e9p.. 62, printemps-\u00e9t\u00e9 2008.<\/p>\n<div class=\"powerpress_player\" id=\"powerpress_player_9638\"><audio class=\"wp-audio-shortcode\" id=\"audio-300-1\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"http:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2008\/09\/CSStereo.mp3?_=1\" \/><a href=\"http:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2008\/09\/CSStereo.mp3\">http:\/\/audioblog.sonatura.com\/wp-content\/uploads\/2008\/09\/CSStereo.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\/2008\/09\/CSStereo.mp3\" class=\"powerpress_link_pinw\" target=\"_blank\" title=\"Play in new window\" onclick=\"return powerpress_pinw('https:\/\/audioblog.sonatura.com\/?powerpress_pinw=300-podcast');\" rel=\"nofollow\">Play in new window<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Vous avez sans doute d\u00e9j\u00e0 entendu une transcription audible des cris ultrasoniques que les chauves-souris \u00e9mettent pour se rep\u00e9rer ou localiser leurs proies. Plusieurs techniques existent pour ce faire. Ici c\u2019est le mode dit h\u00e9t\u00e9rodyne qui a \u00e9t\u00e9 choisi car&nbsp;&hellip; <a href=\"https:\/\/audioblog.sonatura.com\/?p=300\">finish&nbsp;reading&nbsp;Chauves-souris en st\u00e9r\u00e9o&#8230;<\/a><\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-300","post","type-post","status-publish","format-standard","hentry","category-non-repertorie"],"_links":{"self":[{"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=\/wp\/v2\/posts\/300","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\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=300"}],"version-history":[{"count":3,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=\/wp\/v2\/posts\/300\/revisions"}],"predecessor-version":[{"id":3918,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=\/wp\/v2\/posts\/300\/revisions\/3918"}],"wp:attachment":[{"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=300"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=300"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/audioblog.sonatura.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}