{"id":320,"date":"2010-06-08T13:09:10","date_gmt":"2010-06-08T19:09:10","guid":{"rendered":"http:\/\/blog.faberacoustical.com\/?p=320"},"modified":"2014-02-28T12:41:41","modified_gmt":"2014-02-28T18:41:41","slug":"usb-audio-on-ipad","status":"publish","type":"post","link":"https:\/\/blog.faberacoustical.com\/wpblog\/2010\/ios\/ipad\/usb-audio-on-ipad\/","title":{"rendered":"USB Audio on iPad"},"content":{"rendered":"<p>As I mentioned in a <a href=\"http:\/\/blog.faberacoustical.com\/2010\/ipad\/ipad-audio-input-options\/\" target=\"_self\">previous post<\/a>, the iPad does not support audio line level input through its 30-pin dock connector. This would seem to be a major limitation of the iPad, as far as audio-band test and measurement is concerned, if it weren&#8217;t for the fact that the iPad can function as a USB host for USB audio input\/output devices. Unfortunately, however, connecting a USB audio device is not as straightforward as it might seem. The goal, here, is to enumerate some of the current issues with\u00a0USB audio on the iPad.<\/p>\n<div id=\"attachment_324\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.faberacoustical.com\/wpblog\/wp-content\/uploads\/2010\/06\/iPad-USB-Crop.jpeg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-324\" class=\"size-full wp-image-324\" title=\"iPad USB\" alt=\"\" src=\"http:\/\/www.faberacoustical.com\/wpblog\/wp-content\/uploads\/2010\/06\/iPad-USB-Crop.jpeg\" width=\"600\" height=\"244\" \/><\/a><p id=\"caption-attachment-324\" class=\"wp-caption-text\">Add a USB port to your iPad with the Camera Connection Kit<\/p><\/div>\n<p><strong>USB audio support on the iPad<\/strong> &#8212; issues to be aware of:<\/p>\n<ul>\n<li><strong>USB devices currently must be connected to the iPad via the USB port of the iPad Camera Connection Kit.<\/strong> It&#8217;s the USB-dock adapter in the camera connection kit that switches the iPad into USB host mode.<\/li>\n<li><strong>The iPad can only provide bus power to low-power USB devices<\/strong> (those which draw 100 mA, or less, of current). Devices that require more power can still be used with the iPad, but they will either need to be self-powered (typically via a battery or AC adapter), or they will need to be connected via a powered USB hub.<\/li>\n<li><strong>The iPad supports full-speed,\u00a016-bit, USB audio class compliant audio devices.<\/strong> High speed and 24-bit devices are not supported. Devices which to not conform to the USB audio class are also not supported. If a device supports both 24-bit and 16-bit operation, it should be switched to 16-bit mode before it is connected to the iPad.<\/li>\n<li><strong>Only sample rates up to 48 kHz are supported.<\/strong><\/li>\n<li><strong>When a USB audio device is used for input, neither the iPad&#8217;s headphone jack nor its built-in speaker can be used for output.<\/strong> Both input and output are routed through the USB port, by the OS.<\/li>\n<li><strong><strong>Asynchronous <\/strong>USB audio devices experience periodic data loss when used with the iPad.<\/strong> (Hopefully, Apple will move to properly support asynchronous USB audio devices, soon, since this essentially renders useless a significant number of otherwise capable devices. I&#8217;ll indicate which devices I have found that fall into this category in a future post.)<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The goal, here, is to enumerate some of the current issues with USB audio on the iPad.<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[72,37,24],"tags":[28,99,30,29,31],"class_list":["post-320","post","type-post","status-publish","format-standard","hentry","category-hardware","category-ios","category-ipad","tag-audio","tag-ipad","tag-measurement","tag-test","tag-usb"],"_links":{"self":[{"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/posts\/320","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/comments?post=320"}],"version-history":[{"count":12,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/posts\/320\/revisions"}],"predecessor-version":[{"id":947,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/posts\/320\/revisions\/947"}],"wp:attachment":[{"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/media?parent=320"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/categories?post=320"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/tags?post=320"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}