{"id":65,"date":"2021-03-18T11:47:59","date_gmt":"2021-03-18T15:47:59","guid":{"rendered":"https:\/\/seniordesign.digitalscholar.rochester.edu\/ame2021\/?p=65"},"modified":"2022-04-13T10:45:46","modified_gmt":"2022-04-13T14:45:46","slug":"ame-team","status":"publish","type":"post","link":"https:\/\/www.hajim.rochester.edu\/senior-design-day\/ame-team\/","title":{"rendered":"Improving Audio Quality of Online Conference Application"},"content":{"rendered":"\n<p><em>A project by Ocean Cheng, Senyuan Fan, Beau Hanson, Aaron Messina, and Jiwei Zou<\/em><\/p>\n\n\n\n<p>Online conference applications like ZOOM, Google Meet and Discord have been ubiquitous in our lives since COVID-19. While these apps are powerful and constantly evolving, they usually prioritize video quality and features before audio. We investigated ways to improve audio quality and experience of our online conferences.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Audio Conference Demo<\/h2>\n\n\n\n<figure class=\"wp-block-video\"><video height=\"1080\" style=\"aspect-ratio: 1920 \/ 1080;\" width=\"1920\" controls src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Senior-Design-Final-Demo.mp4\"><\/video><figcaption><em><strong>\u00a9<\/strong> Immersitech 2021<\/em><\/figcaption><\/figure>\n\n\n\n<p>Here is a quick demonstration of an online conference featuring our audio algorithms, including background noise removal, dynamic compression and stereo panning. The algorithms are toggled on and off throughout the meeting, as shown in the center of the meeting&#8217;s interface. The signal-to-noise ratio (SNR) of the given speech is also displayed in real-time, and can be seen on the right.<\/p>\n\n\n\n<hr class=\"wp-block-coblocks-dynamic-separator\" style=\"height:70px\"\/>\n\n\n\n<div class=\"wp-block-columns has-background is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" style=\"background:linear-gradient(180deg,rgb(68,205,246) 0%,rgb(19,0,255) 97%)\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<h3 class=\"has-text-align-center wp-block-heading\"><strong>Thank You to <\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image alignwide size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1250\" height=\"436\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/182575723_1255605958169115_4474458978645238718_n.png\" alt=\"\" class=\"wp-image-120\" srcset=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/182575723_1255605958169115_4474458978645238718_n.png 1250w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/182575723_1255605958169115_4474458978645238718_n-300x105.png 300w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/182575723_1255605958169115_4474458978645238718_n-1024x357.png 1024w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/182575723_1255605958169115_4474458978645238718_n-768x268.png 768w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/182575723_1255605958169115_4474458978645238718_n-1200x419.png 1200w\" sizes=\"auto, (max-width: 1250px) 100vw, 1250px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<p>Our quest to improve online audio conferencing could not have happened without the help of <strong>immersitech<\/strong>, a local Rochester, NY based company dedicated to similar values of excellence in online conferencing. &nbsp;Their website can be found <a href=\"https:\/\/immersitech.io\">here<\/a>. &nbsp;<\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group alignfull\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group alignwide has-background has-large-padding\" style=\"background:linear-gradient(183deg,rgb(19,0,255) 0%,rgb(82,169,224) 100%)\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading\">Background<\/h2>\n\n\n\n<p>We conducted a survey to consider audio communication issues that students and professors deal with. &nbsp;The survey had 25 responses, and was sent to students and professors at the University of Rochester.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"434\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Screen-Shot-2021-05-04-at-10.26.33-1024x434.png\" alt=\"\" class=\"wp-image-142\" srcset=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Screen-Shot-2021-05-04-at-10.26.33-1024x434.png 1024w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Screen-Shot-2021-05-04-at-10.26.33-300x127.png 300w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Screen-Shot-2021-05-04-at-10.26.33-768x326.png 768w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Screen-Shot-2021-05-04-at-10.26.33.png 1090w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Chart showing responses to most prevalent issue in audio conferencing<\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\"><li>Other takeaways (based on popular softwares)<ul><li>Speech transmission rating:  <strong>3.5\/5<\/strong><\/li><li>Music transmission rating:  <strong>2.4\/5<\/strong><\/li><\/ul><\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-no-padding\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group alignfull has-background has-no-padding\" style=\"background:linear-gradient(180deg,rgb(82,169,224) 0%,rgb(0,80,255) 100%)\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"has-text-align-left wp-block-heading\" style=\"font-size:52px\">Algorithms<\/h2>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<ul class=\"has-normal-font-size wp-block-list\"><li><strong>Noise Reduction <\/strong><ul><li>The Wiener Filter [Philipos C. Loizou &#8220;Speech Enhancement, Theory and Practice&#8221;] is a classic way to reduce the stationary noise in audio.<\/li><li>It uses a threshold to distinguish between noise signal and noisy speech signal, just like the noise gate. Instead of cutting out the noise frames, it makes use of them to calculate the Power Spectral Density (PSD) of the noise.<\/li><li>Using the noise and speech PSD, it calculates and updates the frequency domain filter that will be applied to the spectrum of the raw signal. This helps reduce the noise even when speech.<\/li><\/ul><\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"559\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Noise-Reduction-Block-Diagram-1024x559.png\" alt=\"\" class=\"wp-image-110\" srcset=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Noise-Reduction-Block-Diagram-1024x559.png 1024w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Noise-Reduction-Block-Diagram-300x164.png 300w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Noise-Reduction-Block-Diagram-768x420.png 768w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Noise-Reduction-Block-Diagram-1536x839.png 1536w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Noise-Reduction-Block-Diagram-1200x656.png 1200w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/Noise-Reduction-Block-Diagram.png 1574w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Block Diagram of the Noise Reduction Algorithm<\/figcaption><\/figure>\n\n\n\n<ul id=\"block-f718bc03-d2c3-4a28-bf8b-19ed41e72a68\" class=\"has-normal-font-size wp-block-list\"><li><strong>Dynamic Range Compression<\/strong><ul><li>This form of compression increases intelligibility (Reinhart &amp; Souza 2016), and can also reduce online meeting fatigue.<\/li><li>Mode-adjustable parameters of Attack &amp; Release times, Threshold<\/li><li>Better regulates user volume disparities<\/li><\/ul><\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"559\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Compressor-Block-Diagram-1024x559.png\" alt=\"\" class=\"wp-image-97\" srcset=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Compressor-Block-Diagram-1024x559.png 1024w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Compressor-Block-Diagram-300x164.png 300w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Compressor-Block-Diagram-768x420.png 768w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Compressor-Block-Diagram-1536x839.png 1536w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Compressor-Block-Diagram-1200x656.png 1200w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Compressor-Block-Diagram.png 1574w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Block Diagram of the compressor algorithm<\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Noise Gating<\/strong><ul><li>This form of noise removal is different from the Noise Reduction algorithm in that it only targets noise below a given threshold. The noise gate mainly removes background noise present when the user is not speaking<\/li><li>Mode-adjustable parameters of Threshold, Attack time and Release time for gain smoothing<\/li><\/ul><\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"559\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Noise-Gate-Block-Diagram-1024x559.png\" alt=\"\" class=\"wp-image-99\" srcset=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Noise-Gate-Block-Diagram-1024x559.png 1024w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Noise-Gate-Block-Diagram-300x164.png 300w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Noise-Gate-Block-Diagram-768x420.png 768w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Noise-Gate-Block-Diagram-1536x839.png 1536w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Noise-Gate-Block-Diagram-1200x656.png 1200w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Noise-Gate-Block-Diagram.png 1574w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Block diagram of the noise gating algorithm<\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Evaluation:<\/strong> WADA-STNR<ul><li>The amplitude distribution of speech can be approximated with Gamma speech, even with noise. [1]<\/li><\/ul><ul><li>STNR can be estimated via examining the amplitude distribution of corrupted speech.<\/li><\/ul><\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"479\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/STNR-Block-Diagram-1024x479.png\" alt=\"\" class=\"wp-image-100\" srcset=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/STNR-Block-Diagram-1024x479.png 1024w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/STNR-Block-Diagram-300x140.png 300w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/STNR-Block-Diagram-768x359.png 768w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/STNR-Block-Diagram-1536x718.png 1536w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/STNR-Block-Diagram-1200x561.png 1200w, https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/STNR-Block-Diagram.png 1574w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Block diagram of the STNR evaluation algorithm<\/figcaption><\/figure>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group__inner-container\"><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-background\" style=\"background:linear-gradient(180deg,rgb(0,80,255) 0%,rgb(68,205,246) 100%)\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading\">Modes<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Music\/Transparent Mode<ul><li>All algorithms removed, bare processing to ensure transparency<\/li><\/ul><\/li><li>Quiet Room<ul><li>Minimal gating and compression<\/li><\/ul><\/li><li>Cafe<ul><li>Normal gating and compression<\/li><li>Noise reduction engaged<\/li><\/ul><\/li><li>Industrial<ul><li>Aggressive gating and compression<\/li><li>Noise reduction engaged<\/li><\/ul><\/li><\/ul>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group alignfull has-background\" style=\"background:linear-gradient(180deg,rgb(68,205,246) 0%,rgb(155,81,224) 100%)\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading\">Audio Examples<\/h2>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/clnsp48-1.wav\"><\/audio><figcaption>Speech Ex. 1 (Minimal Noise), Gz: 1.78, STNR: 100<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/clnsp48_mode1.wav\"><\/audio><figcaption>Speech Ex. 1 &#8211; Processed using Mode 1, Gz: 5.08, STNR: 100<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/noisy172-1.wav\"><\/audio><figcaption>Speech Ex. 2 (Noisy), Gz: 0.70, STNR: 11.43<audio src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/clnsp48.wav\">Speech Ex. 2 (Noisy)<\/audio><\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/05\/noisy172_mode2.wav\"><\/audio><figcaption>Speech Ex. 2 &#8211; Processed using Mode 2, Gz: 1.73, STNR: 100<\/figcaption><\/figure>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-coblocks-accordion\">\n<div class=\"wp-block-coblocks-accordion-item\"><details><summary class=\"wp-block-coblocks-accordion-item__title\">References<\/summary><div class=\"wp-block-coblocks-accordion-item__content\">\n[1] Kim, Chanwoo, and Richard M. Stern. &#8220;Robust signal-to-noise ratio estimation based on waveform amplitude distribution analysis.&#8221;&nbsp;<em>Ninth Annual Conference of the International Speech Communication Association<\/em>. 2008.<\/p>\n<\/div><\/details><\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p> We are not okay with the compromised sound in online conference apps, and we investigated ways to improve.<\/p>\n","protected":false},"author":6242,"featured_media":39,"comment_status":"open","ping_status":"open","sticky":false,"template":"templates\/template-full-width.php","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[46,2966],"tags":[],"coauthors":[8612],"class_list":["post-65","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ame-archive","category-audio-archive"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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