{"id":8893,"date":"2013-12-27T04:58:20","date_gmt":"2013-12-27T04:58:20","guid":{"rendered":"http:\/\/zerokidz.com\/ideas\/?p=8893"},"modified":"2014-06-12T02:47:41","modified_gmt":"2014-06-12T06:47:41","slug":"near-ultrasound-data-transfer-in-max-using-fsk-rtty","status":"publish","type":"post","link":"https:\/\/reactivemusic.net\/?p=8893","title":{"rendered":"near-ultrasound data transfer in Max using FSK (rtty)"},"content":{"rendered":"<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.44.04-AM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-9045\" title=\"Screen Shot 2014-01-01 at 1.44.04 AM\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.44.04-AM-300x160.png\" alt=\"\" width=\"300\" height=\"160\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.44.04-AM-300x160.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.44.04-AM-1024x547.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.44.04-AM-500x267.png 500w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.44.04-AM.png 1222w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.46.32-AM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-9046\" title=\"Screen Shot 2014-01-01 at 1.46.32 AM\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.46.32-AM-300x148.png\" alt=\"\" width=\"300\" height=\"148\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.46.32-AM-300x148.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.46.32-AM-1024x505.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.46.32-AM-500x246.png 500w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2013\/12\/Screen-Shot-2014-01-01-at-1.46.32-AM.png 1144w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>An example of sending data through the air, from one computer to another, using sound. The carrier frequency &#8211; 18Khz &#8211; just below ultrasound, is inaudible to most humans. The data protocol is Audio Frequency Shift Keying (AFSK) at 45 bits\/second. It uses two tones &#8211; to encode 1&#8217;s and 0&#8217;s. This protocol was developed for radio teletype (rtty).<\/p>\n<p>One computer sends the word &#8220;hello&#8221; to the other computer every 10 seconds.<\/p>\n<p>The idea came from a paper by Michael Hanspach and Michael Goetz &#8211; &#8220;On Covert Acoustical Mesh Networks in Air&#8221; &#8211; <a href=\"http:\/\/www.jocm.us\/uploadfile\/2013\/1125\/20131125103803901.pdf\">http:\/\/www.jocm.us\/uploadfile\/2013\/1125\/20131125103803901.pdf<\/a>. In the paper they explain that the concept was borrowed from current technology for underwater data networks. They warn of the vulnerability of &#8220;air-gapping&#8221; as a method of computer security.<\/p>\n<p><iframe loading=\"lazy\" title=\"near-ultrasound air data transfer in Max\" width=\"525\" height=\"295\" src=\"https:\/\/www.youtube.com\/embed\/lJ0IMOZ7Od0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Actually, after watching the video I realized its difficult to make exciting videos that feature sounds you can&#8217;t hear. Especially when you are whispering. Well, the pro camera crew should be knocking on the door at any moment.<\/p>\n<h4>download<\/h4>\n<p><a href=\"https:\/\/github.com\/tkzic\/max-projects\">https:\/\/github.com\/tkzic\/max-projects<\/a><\/p>\n<p>folder: frequency-shift-keying<\/p>\n<p>patches:<\/p>\n<ul>\n<li>rtty-recv12.maxpat<\/li>\n<li>rtty-send12.maxpat<\/li>\n<\/ul>\n<div><span style=\"line-height: 22px;\">javascript files:<\/span><\/div>\n<div><\/div>\n<div>\n<ul>\n<li><span style=\"line-height: 14px;\">rtty-encode10.js<\/span><\/li>\n<li><span style=\"line-height: 14px;\">rtty-recv9.js<\/span><\/li>\n<\/ul>\n<\/div>\n<h4>Notes:<\/h4>\n<p>To run patches:<\/p>\n<ul>\n<li>in rtty-send12 set carrier frequency to something like 200<\/li>\n<li>then toggle start\/stop<\/li>\n<li>You may want to increase the speed to 32<\/li>\n<li>On the receive side, clear the text box<\/li>\n<li>Make sure to set audio as described below<\/li>\n<\/ul>\n<p>In audio settings try<\/p>\n<ul>\n<li>io vector = 512,<\/li>\n<li>\u00a0signal vector = 32,<\/li>\n<li>\u00a0overdrive and audio-interrupt should be enabled,<\/li>\n<li>\u00a0SR=96 Khz.<\/li>\n<\/ul>\n<p>Interesting discovery &#8211; or maybe a coincidence. Bit rates which are powers of 2 seem to work way better than arbitrary speeds. \u00a0I wonder if its because the signal vector size is also a power of 2?<\/p>\n<p>Going from a direct audio connection to an through-the-air connection led to a number of issues with filtering and and levels. \u00a0The latest version of the Max patches have been organized into modules, like: encoder, transmitter, decoder, phasor-clock, etc., But they would benefit from some encapsulation.<\/p>\n<p>It was interesting that throughput was better above 14Khz. Possibly due to less interference from environmental sounds &#8211; and less critical filtering. During the video I was able to talk (whisper), without interfering \u00a0with data transfer. But if I squeaked a chair or tapped the desk, it would screw-up. Also, the builtin mic\/speaker on MacBooks have response curves that are all over the place.<\/p>\n<p>The next version will have sharper filters and an automatic level control (compressor). \u00a0There&#8217;s \u00a0difficult interaction in the detection process between filtering and timing. Up to this point I&#8217;ve been reluctant to use frequency domain filtering due to loss of timing resolution. Latency is ok though. But the other thing is that we don&#8217;t want filters which soften or distort the shapes of the pulses.<\/p>\n<p>So one question is how high can you go &#8211; with the built-in mic and speaker. They are not rated above 20 Khz. but you never know?<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>An example of sending data through the air, from one computer to another, using sound. The carrier frequency &#8211; 18Khz &#8211; just below ultrasound, is inaudible to most humans. The data protocol is Audio Frequency Shift Keying (AFSK) at 45 bits\/second. It uses two tones &#8211; to encode 1&#8217;s and 0&#8217;s. This protocol was developed &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/reactivemusic.net\/?p=8893\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;near-ultrasound data transfer in Max using FSK (rtty)&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[21,273,28],"tags":[190,57,13],"class_list":["post-8893","post","type-post","status-publish","format-standard","hentry","category-dsp","category-max-projects","category-maxmsp","tag-portfolio","tag-radio","tag-teaching"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>near-ultrasound data transfer in Max using FSK (rtty) - reactive music<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/reactivemusic.net\/?p=8893\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"near-ultrasound data transfer in Max using FSK (rtty) - reactive music\" \/>\n<meta property=\"og:description\" content=\"An example of sending data through the air, from one computer to another, using sound. The carrier frequency &#8211; 18Khz &#8211; just below ultrasound, is inaudible to most humans. The data protocol is Audio Frequency Shift Keying (AFSK) at 45 bits\/second. It uses two tones &#8211; to encode 1&#8217;s and 0&#8217;s. 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