{"id":17855,"date":"2014-12-16T14:31:20","date_gmt":"2014-12-16T19:31:20","guid":{"rendered":"https:\/\/reactivemusic.net\/?p=17855"},"modified":"2014-12-23T00:50:14","modified_gmt":"2014-12-23T05:50:14","slug":"processing-shortwave-radio-sounds","status":"publish","type":"post","link":"https:\/\/reactivemusic.net\/?p=17855","title":{"rendered":"Processing shortwave radio sounds"},"content":{"rendered":"<p class=\"lead\">Using the python sms-tools library.<\/p>\n<p>sms-tools:\u00a0<a href=\"https:\/\/github.com\/MTG\/sms-tools\">https:\/\/github.com\/MTG\/sms-tools<\/a><\/p>\n<p>Here is a song made from the processed sounds:<\/p>\n<iframe loading=\"lazy\" width=\"100%\" height=\"100\" scrolling=\"no\" frameborder=\"no\" src=\"https:\/\/w.soundcloud.com\/player?url=https%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F181723486&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false\"><\/iframe>\n<p>mp3 version:<\/p>\n<div class=\"wp-playlist wp-audio-playlist wp-playlist-light\">\n\t\t\t<div class=\"wp-playlist-current-item\"><\/div>\n\t\t<audio controls=\"controls\" preload=\"none\" width=\"503\"\n\t\t\t><\/audio>\n\t<div class=\"wp-playlist-next\"><\/div>\n\t<div class=\"wp-playlist-prev\"><\/div>\n\t<noscript>\n\t<ol>\n\t\t<li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/radiosounds2.mp3'>radiosounds2<\/a><\/li>\t<\/ol>\n\t<\/noscript>\n\t<script type=\"application\/json\" class=\"wp-playlist-script\">{\"type\":\"audio\",\"tracklist\":true,\"tracknumbers\":true,\"images\":true,\"artists\":true,\"tracks\":[{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/radiosounds2.mp3\",\"type\":\"audio\/mpeg\",\"title\":\"radiosounds2\",\"caption\":\"\",\"description\":\"\\\"radiosounds2\\\".\",\"meta\":{\"length_formatted\":\"1:08\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}}]}<\/script>\n<\/div>\n\t\n<p>This project was an assignment for the Coursera &#8220;Audio Signal Processing for Music Applications&#8221; course.\u00a0<a href=\"https:\/\/www.coursera.org\/course\/audio\">https:\/\/www.coursera.org\/course\/audio<\/a><\/p>\n<h4>Source material<\/h4>\n<p>Sounds were recorded from a shortwave radio between 5-10MHz.<\/p>\n<div class=\"wp-playlist wp-audio-playlist wp-playlist-light\">\n\t\t\t<div class=\"wp-playlist-current-item\"><\/div>\n\t\t<audio controls=\"controls\" preload=\"none\" width=\"503\"\n\t\t\t><\/audio>\n\t<div class=\"wp-playlist-next\"><\/div>\n\t<div class=\"wp-playlist-prev\"><\/div>\n\t<noscript>\n\t<ol>\n\t\t<li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/am_interference_7mhz.wav'>am_interference_7mhz<\/a><\/li><li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_7mhz.wav'>buzz_pulse_7mhz<\/a><\/li><li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/digital_pulse_7mhz.wav'>digital_pulse_7mhz<\/a><\/li><li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/cw_7mhz1_small.wav'>cw_7mhz1_small<\/a><\/li><li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/wwv_5mhz_short.wav'>wwv_5mhz_short<\/a><\/li>\t<\/ol>\n\t<\/noscript>\n\t<script type=\"application\/json\" class=\"wp-playlist-script\">{\"type\":\"audio\",\"tracklist\":true,\"tracknumbers\":true,\"images\":true,\"artists\":true,\"tracks\":[{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/am_interference_7mhz.wav\",\"type\":\"audio\/wav\",\"title\":\"am_interference_7mhz\",\"caption\":\"\",\"description\":\"\\\"am_interference_7mhz\\\".\",\"meta\":{\"length_formatted\":\"0:22\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}},{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_7mhz.wav\",\"type\":\"audio\/wav\",\"title\":\"buzz_pulse_7mhz\",\"caption\":\"\",\"description\":\"\\\"buzz_pulse_7mhz\\\".\",\"meta\":{\"length_formatted\":\"0:12\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}},{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/digital_pulse_7mhz.wav\",\"type\":\"audio\/wav\",\"title\":\"digital_pulse_7mhz\",\"caption\":\"\",\"description\":\"\\\"digital_pulse_7mhz\\\".\",\"meta\":{\"length_formatted\":\"0:21\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}},{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/cw_7mhz1_small.wav\",\"type\":\"audio\/wav\",\"title\":\"cw_7mhz1_small\",\"caption\":\"\",\"description\":\"\\\"cw_7mhz1_small\\\".\",\"meta\":{\"length_formatted\":\"0:09\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}},{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/wwv_5mhz_short.wav\",\"type\":\"audio\/wav\",\"title\":\"wwv_5mhz_short\",\"caption\":\"\",\"description\":\"\\\"wwv_5mhz_short\\\".\",\"meta\":{\"length_formatted\":\"0:22\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}}]}<\/script>\n<\/div>\n\t\n<p>freesound.org links to the sounds:<\/p>\n<ul>\n<li>am_interference_7mhz:\u00a0<a href=\"https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258095\/\">https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258095\/<\/a><\/li>\n<li>buzz_pulse_7mhz:\u00a0<a href=\"https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258096\/\">https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258096\/<\/a><\/li>\n<li>digital_pulse_7mhz:\u00a0<a href=\"https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258098\/\">https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258098\/<\/a><\/li>\n<li>cw_7mhz1_small:\u00a0<a href=\"https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258097\/\">https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258097\/<\/a><\/li>\n<li>wwv_5mhz_short:\u00a0<a href=\"https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258099\/\">https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258099\/<\/a><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h4>Processing<\/h4>\n<h5>am_interference_7mhz.wav<\/h5>\n<p>The sound is an AM shortwave broadcast station from between 7-8 MHz. It is speech with atmospheric noise and a digitally modulated carrier at 440Hz in the background.<\/p>\n<p>I tried various approaches to removing the speech and isolating the carrier. But ended up using the following parameters to remove noise and speech, but for most part leaving a 440hz digital mode signal with large gaps in it.<\/p>\n<ul>\n<li>M=701<\/li>\n<li>N=1024<\/li>\n<li>minf0=400<\/li>\n<li>maxf0=500<\/li>\n<li>thresh=-90<\/li>\n<li>max harmonics=50<\/li>\n<\/ul>\n<p>After more experimentation, the following changes resulted in a cool continuous tone with speechlike quality (but not intelligible) and the background noise is gone.<\/p>\n<p>Here is the full list of parameters:<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/am_interferece_7_mhz_harmonic_model_2_params.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17872 size-thumbnail\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/am_interferece_7_mhz_harmonic_model_2_params-150x150.png\" alt=\"am_interferece_7_mhz_harmonic_model_2_params\" width=\"150\" height=\"150\" \/><\/a><\/p>\n<p>Here is a plot:<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.03.55-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17873\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.03.55-PM-300x74.png\" alt=\"Screen Shot 2014-12-16 at 8.03.55 PM\" width=\"300\" height=\"74\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.03.55-PM-300x74.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.03.55-PM-1024x254.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.03.55-PM.png 1680w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Here is the resulting sound of the sinusoidal part of the harmonic model:<\/p>\n<div class=\"wp-playlist wp-audio-playlist wp-playlist-light\">\n\t\t\t<div class=\"wp-playlist-current-item\"><\/div>\n\t\t<audio controls=\"controls\" preload=\"none\" width=\"503\"\n\t\t\t><\/audio>\n\t<div class=\"wp-playlist-next\"><\/div>\n\t<div class=\"wp-playlist-prev\"><\/div>\n\t<noscript>\n\t<ol>\n\t\t<li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/am_interference_7mhz_harmonicModel.wav'>am_interference_7mhz_harmonicModel<\/a><\/li>\t<\/ol>\n\t<\/noscript>\n\t<script type=\"application\/json\" class=\"wp-playlist-script\">{\"type\":\"audio\",\"tracklist\":true,\"tracknumbers\":true,\"images\":true,\"artists\":true,\"tracks\":[{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/am_interference_7mhz_harmonicModel.wav\",\"type\":\"audio\/wav\",\"title\":\"am_interference_7mhz_harmonicModel\",\"caption\":\"\",\"description\":\"\\\"am_interference_7mhz_harmonicModel\\\".\",\"meta\":{\"length_formatted\":\"0:22\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}}]}<\/script>\n<\/div>\n\t\n<h5>buzz_pulse_7mhz.wav<\/h5>\n<p><span style=\"line-height: 1.6;\">The sound is continuous digital modulation (buzzing) from a shortwave radio between 7-8 MHz. The buzz is around 100Hz with atmospheric background noise.<\/span><\/p>\n<p><span style=\"line-height: 1.6;\">Transformation using HPS (harmonic plus stochastic) model.<\/span><\/p>\n<p>Not very impressive analysis, but the resynthesis had a very cool looking spectrogram due to some frequency shifting.<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_hps_params.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17883 size-thumbnail\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_hps_params-150x150.png\" alt=\"buzz_pulse_hps_params\" width=\"150\" height=\"150\" \/><\/a><\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.12.43-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17877\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.12.43-PM-300x82.png\" alt=\"Screen Shot 2014-12-16 at 8.12.43 PM\" width=\"300\" height=\"82\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.12.43-PM-300x82.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.12.43-PM-1024x282.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.12.43-PM.png 1650w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>I realized that I had set f0min too high. Went back to using the HPR model without transformation to see if I could separate the tone. Here is the plot:<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_hpr_params.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17884 size-thumbnail\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_hpr_params-150x150.png\" alt=\"buzz_pulse_hpr_params\" width=\"150\" height=\"150\" \/><\/a><\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.33.50-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17886\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.33.50-PM-300x105.png\" alt=\"Screen Shot 2014-12-16 at 8.33.50 PM\" width=\"300\" height=\"105\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.33.50-PM-300x105.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.33.50-PM-1024x361.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.33.50-PM.png 1276w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Here are the resulting sounds transformation (unused) and the sinusoidal\/residual results that were used in the track.<\/p>\n<div class=\"wp-playlist wp-audio-playlist wp-playlist-light\">\n\t\t\t<div class=\"wp-playlist-current-item\"><\/div>\n\t\t<audio controls=\"controls\" preload=\"none\" width=\"503\"\n\t\t\t><\/audio>\n\t<div class=\"wp-playlist-next\"><\/div>\n\t<div class=\"wp-playlist-prev\"><\/div>\n\t<noscript>\n\t<ol>\n\t\t<li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_7mhz_hpsModelTransformation.wav'>buzz_pulse_7mhz_hpsModelTransformation<\/a><\/li><li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_7mhz_hprModel_sines.wav'>buzz_pulse_7mhz_hprModel_sines<\/a><\/li><li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_7mhz_hprModel_residual.wav'>buzz_pulse_7mhz_hprModel_residual<\/a><\/li>\t<\/ol>\n\t<\/noscript>\n\t<script type=\"application\/json\" class=\"wp-playlist-script\">{\"type\":\"audio\",\"tracklist\":true,\"tracknumbers\":true,\"images\":true,\"artists\":true,\"tracks\":[{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_7mhz_hpsModelTransformation.wav\",\"type\":\"audio\/wav\",\"title\":\"buzz_pulse_7mhz_hpsModelTransformation\",\"caption\":\"\",\"description\":\"\\\"buzz_pulse_7mhz_hpsModelTransformation\\\".\",\"meta\":{\"length_formatted\":\"0:12\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}},{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_7mhz_hprModel_sines.wav\",\"type\":\"audio\/wav\",\"title\":\"buzz_pulse_7mhz_hprModel_sines\",\"caption\":\"\",\"description\":\"\\\"buzz_pulse_7mhz_hprModel_sines\\\".\",\"meta\":{\"length_formatted\":\"0:12\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}},{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/buzz_pulse_7mhz_hprModel_residual.wav\",\"type\":\"audio\/wav\",\"title\":\"buzz_pulse_7mhz_hprModel_residual\",\"caption\":\"\",\"description\":\"\\\"buzz_pulse_7mhz_hprModel_residual\\\".\",\"meta\":{\"length_formatted\":\"0:12\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}}]}<\/script>\n<\/div>\n\t\n<h5>source: digital_pulse_7hz.wav<\/h5>\n<p>A repeating pulse around from a shortwave radio between 7-8 MHz. The frequency of the pulse is around 1000Hz with a noise component.<\/p>\n<p>Another noise filter &#8211; this was way more difficult due to high freq material.<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/digital_pulse_hpr_params.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17889 size-thumbnail\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/digital_pulse_hpr_params-150x150.png\" alt=\"digital_pulse_hpr_params\" width=\"150\" height=\"150\" \/><\/a><\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.40.12-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17888\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.40.12-PM-300x70.png\" alt=\"Screen Shot 2014-12-16 at 8.40.12 PM\" width=\"300\" height=\"70\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.40.12-PM-300x70.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.40.12-PM-1024x241.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.40.12-PM.png 1698w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Instead, I went with a downward\u00a0pitch transform, using the HPS model transform. Here are the resulting sounds from \u00a0the HPR filter (unused) and the HPS transform.<\/p>\n<div class=\"wp-playlist wp-audio-playlist wp-playlist-light\">\n\t\t\t<div class=\"wp-playlist-current-item\"><\/div>\n\t\t<audio controls=\"controls\" preload=\"none\" width=\"503\"\n\t\t\t><\/audio>\n\t<div class=\"wp-playlist-next\"><\/div>\n\t<div class=\"wp-playlist-prev\"><\/div>\n\t<noscript>\n\t<ol>\n\t\t<li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/digital_pulse_7mhz_hprModel_sines.wav'>digital_pulse_7mhz_hprModel_sines<\/a><\/li><li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/digital_pulse_7mhz_hprModel_sines_hpsModelTransformation.wav'>digital_pulse_7mhz_hprModel_sines_hpsModelTransformation<\/a><\/li>\t<\/ol>\n\t<\/noscript>\n\t<script type=\"application\/json\" class=\"wp-playlist-script\">{\"type\":\"audio\",\"tracklist\":true,\"tracknumbers\":true,\"images\":true,\"artists\":true,\"tracks\":[{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/digital_pulse_7mhz_hprModel_sines.wav\",\"type\":\"audio\/wav\",\"title\":\"digital_pulse_7mhz_hprModel_sines\",\"caption\":\"\",\"description\":\"\\\"digital_pulse_7mhz_hprModel_sines\\\".\",\"meta\":{\"length_formatted\":\"0:21\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}},{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/digital_pulse_7mhz_hprModel_sines_hpsModelTransformation.wav\",\"type\":\"audio\/wav\",\"title\":\"digital_pulse_7mhz_hprModel_sines_hpsModelTransformation\",\"caption\":\"\",\"description\":\"\\\"digital_pulse_7mhz_hprModel_sines_hpsModelTransformation\\\".\",\"meta\":{\"length_formatted\":\"0:21\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}}]}<\/script>\n<\/div>\n\t\n<h5>cw_7mhz1_small.wav<\/h5>\n<p>The sound contains typical amateur radio CW signals from the 40 Meter band, with several interfering signals (QRM) and atmospheric noise (QRN). Using the HPR model, I was able to completely isolate and re-synthesize the CW signal, removing all the noise and interfering signals.<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/cw-params.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17894 size-thumbnail\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/cw-params-150x150.png\" alt=\"cw-params\" width=\"150\" height=\"150\" \/><\/a><\/p>\n<p>Note that you can actually see the morse code letters &#8220;T, U, and W&#8221; on the spectrogram of model!<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.55.20-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17893\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.55.20-PM-300x65.png\" alt=\"Screen Shot 2014-12-16 at 8.55.20 PM\" width=\"300\" height=\"65\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.55.20-PM-300x65.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.55.20-PM-1024x224.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-8.55.20-PM.png 1944w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Here is the re-synthesized CW sound:<\/p>\n<div class=\"wp-playlist wp-audio-playlist wp-playlist-light\">\n\t\t\t<div class=\"wp-playlist-current-item\"><\/div>\n\t\t<audio controls=\"controls\" preload=\"none\" width=\"503\"\n\t\t\t><\/audio>\n\t<div class=\"wp-playlist-next\"><\/div>\n\t<div class=\"wp-playlist-prev\"><\/div>\n\t<noscript>\n\t<ol>\n\t\t<li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/cw_7mhz1_small_hprModel_sines.wav'>cw_7mhz1_small_hprModel_sines<\/a><\/li>\t<\/ol>\n\t<\/noscript>\n\t<script type=\"application\/json\" class=\"wp-playlist-script\">{\"type\":\"audio\",\"tracklist\":true,\"tracknumbers\":true,\"images\":true,\"artists\":true,\"tracks\":[{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/cw_7mhz1_small_hprModel_sines.wav\",\"type\":\"audio\/wav\",\"title\":\"cw_7mhz1_small_hprModel_sines\",\"caption\":\"\",\"description\":\"\\\"cw_7mhz1_small_hprModel_sines\\\".\",\"meta\":{\"length_formatted\":\"0:09\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}}]}<\/script>\n<\/div>\n\t\n<h5>wwv_5mhz_short.wav<\/h5>\n<p>The WWV National Bureau of Standards &#8220;clock&#8221; station at 5MHz. A combination of pulses, tones, speech, and background noise.<\/p>\n<p>I was trying to separate the voice from the rest of the tones and noise. After several hours and various approaches, I gave up. The signal may be too complex to separate using these models. There were some interesting plots with the HPR model<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.11.54-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17901\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.11.54-PM-300x72.png\" alt=\"Screen Shot 2014-12-16 at 9.11.54 PM\" width=\"300\" height=\"72\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.11.54-PM-300x72.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.11.54-PM-1024x247.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.11.54-PM.png 1682w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Finally decided to just isolate the\u00a0440 Hz. clock pulse from the rest of the signal:<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/wwv-tone-extract-params.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17898 size-thumbnail\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/wwv-tone-extract-params-150x150.png\" alt=\"wwv-tone-extract-params\" width=\"150\" height=\"150\" \/><\/a><\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.06.09-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17897\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.06.09-PM-300x64.png\" alt=\"Screen Shot 2014-12-16 at 9.06.09 PM\" width=\"300\" height=\"64\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.06.09-PM-300x64.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.06.09-PM-1024x221.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/Screen-Shot-2014-12-16-at-9.06.09-PM.png 1674w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Here is the resulting sound (note that the tone starts several seconds into the sample)<\/p>\n<div class=\"wp-playlist wp-audio-playlist wp-playlist-light\">\n\t\t\t<div class=\"wp-playlist-current-item\"><\/div>\n\t\t<audio controls=\"controls\" preload=\"none\" width=\"503\"\n\t\t\t><\/audio>\n\t<div class=\"wp-playlist-next\"><\/div>\n\t<div class=\"wp-playlist-prev\"><\/div>\n\t<noscript>\n\t<ol>\n\t\t<li><a href='https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/wwv_5mhz_short_harmonicModel.wav'>wwv_5mhz_short_harmonicModel<\/a><\/li>\t<\/ol>\n\t<\/noscript>\n\t<script type=\"application\/json\" class=\"wp-playlist-script\">{\"type\":\"audio\",\"tracklist\":true,\"tracknumbers\":true,\"images\":true,\"artists\":true,\"tracks\":[{\"src\":\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/wwv_5mhz_short_harmonicModel.wav\",\"type\":\"audio\/wav\",\"title\":\"wwv_5mhz_short_harmonicModel\",\"caption\":\"\",\"description\":\"\\\"wwv_5mhz_short_harmonicModel\\\".\",\"meta\":{\"length_formatted\":\"0:22\"},\"image\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64},\"thumb\":{\"src\":\"https:\/\/reactivemusic.net\/wp-includes\/images\/media\/audio.svg\",\"width\":48,\"height\":64}}]}<\/script>\n<\/div>\n\t\n","protected":false},"excerpt":{"rendered":"<p>Using the python sms-tools library. sms-tools:\u00a0https:\/\/github.com\/MTG\/sms-tools Here is a song made from the processed sounds: mp3 version: This project was an assignment for the Coursera &#8220;Audio Signal Processing for Music Applications&#8221; course.\u00a0https:\/\/www.coursera.org\/course\/audio Source material Sounds were recorded from a shortwave radio between 5-10MHz. freesound.org links to the sounds: am_interference_7mhz:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258095\/ buzz_pulse_7mhz:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258096\/ digital_pulse_7mhz:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258098\/ cw_7mhz1_small:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258097\/ wwv_5mhz_short:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258099\/ &nbsp; Processing &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/reactivemusic.net\/?p=17855\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Processing shortwave radio sounds&#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],"tags":[344,57],"class_list":["post-17855","post","type-post","status-publish","format-standard","hentry","category-dsp","tag-dsp","tag-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Processing shortwave radio sounds - 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=17855\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Processing shortwave radio sounds - reactive music\" \/>\n<meta property=\"og:description\" content=\"Using the python sms-tools library. sms-tools:\u00a0https:\/\/github.com\/MTG\/sms-tools Here is a song made from the processed sounds: mp3 version: This project was an assignment for the Coursera &#8220;Audio Signal Processing for Music Applications&#8221; course.\u00a0https:\/\/www.coursera.org\/course\/audio Source material Sounds were recorded from a shortwave radio between 5-10MHz. freesound.org links to the sounds: am_interference_7mhz:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258095\/ buzz_pulse_7mhz:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258096\/ digital_pulse_7mhz:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258098\/ cw_7mhz1_small:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258097\/ wwv_5mhz_short:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258099\/ &nbsp; Processing &hellip; Continue reading &quot;Processing shortwave radio sounds&quot;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/reactivemusic.net\/?p=17855\" \/>\n<meta property=\"og:site_name\" content=\"reactive music\" \/>\n<meta property=\"article:published_time\" content=\"2014-12-16T19:31:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2014-12-23T05:50:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/am_interferece_7_mhz_harmonic_model_2_params-150x150.png\" \/>\n<meta name=\"author\" content=\"Tom Zicarelli\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Tom Zicarelli\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" 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music","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/reactivemusic.net\/?p=17855","og_locale":"en_US","og_type":"article","og_title":"Processing shortwave radio sounds - reactive music","og_description":"Using the python sms-tools library. sms-tools:\u00a0https:\/\/github.com\/MTG\/sms-tools Here is a song made from the processed sounds: mp3 version: This project was an assignment for the Coursera &#8220;Audio Signal Processing for Music Applications&#8221; course.\u00a0https:\/\/www.coursera.org\/course\/audio Source material Sounds were recorded from a shortwave radio between 5-10MHz. freesound.org links to the sounds: am_interference_7mhz:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258095\/ buzz_pulse_7mhz:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258096\/ digital_pulse_7mhz:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258098\/ cw_7mhz1_small:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258097\/ wwv_5mhz_short:\u00a0https:\/\/www.freesound.org\/people\/tkzic\/sounds\/258099\/ &nbsp; Processing &hellip; Continue reading \"Processing shortwave radio sounds\"","og_url":"https:\/\/reactivemusic.net\/?p=17855","og_site_name":"reactive music","article_published_time":"2014-12-16T19:31:20+00:00","article_modified_time":"2014-12-23T05:50:14+00:00","og_image":[{"url":"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/12\/am_interferece_7_mhz_harmonic_model_2_params-150x150.png","type":"","width":"","height":""}],"author":"Tom Zicarelli","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Tom Zicarelli","Est. reading time":"3 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