Pacific Northwest Section of the Audio Engineering Society

Free Ticket. Thank you for joining us. The Zoom link is in the confirmation email that you'll receive shortly.

General admission -Free

Free Ticket plus $5.00 donation. All tickets are otherwise the same. Thank you for joining us and for your generous donation. The Zoom link in the confirmation email that you'll receive shortly.

General Admission plus $5.00 Donation

Free Ticket plus $10.00 donation. All tickets are otherwise the same. Thank you for joining us and for your generous donation. The Zoom link in the confirmation email that you'll receive shortly.

General Admission plus $10.00 Donation

<p fr-original-style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);" style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);">Hi <span contenteditable="false" data-custom-variable="{{firstname}}" fr-original-class="fr-deletable styled-tag-chip" fr-original-style="" style="background-color: rgb(248, 248, 255); border: 1px solid rgb(191, 191, 255); border-radius: 4px; color: rgb(42, 42, 196); padding: 1px 8px; font-size: 11px; display: inline-block; margin: 0px; overflow-wrap: anywhere; -webkit-user-select: none; box-sizing: inherit;">First name</span> ,</p><p fr-original-style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);" style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);"><br fr-original-style="" style="box-sizing: inherit;"></p><p fr-original-style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);" style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);">Thank you for getting a ticket to our Compleat Tutorial on The Quiet Art of Noise in Analogue Audio Circuits &nbsp;meeting.</p><p fr-original-style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);" style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);"><br fr-original-style="" style="box-sizing: inherit;"><strong fr-original-style="" style="font-weight: 700; box-sizing: inherit;">The Zoom link is </strong></p><p fr-original-style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);" style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);"><br fr-original-style="" style="box-sizing: inherit;"></p><p fr-original-style="" id="isPasted">https://us02web.zoom.us/j/87334218750?pwd=c9l3GwAuodlEIdWy8WX3Ue2SAy9OgC.1</p><p fr-original-style=""><br fr-original-style="" style="box-sizing: inherit;"></p><p fr-original-style="">Meeting ID: 873 3421 8750</p><p fr-original-style="">Passcode: 592663</p><p fr-original-style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);" style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;color:rgb(0, 0, 0);"><br fr-original-style="" style="box-sizing: inherit;">Please don&#39;t share it with anybody as we have a finite capacity and want to be sure that everyone gets in.<br fr-original-style="" style="box-sizing: inherit;"><br fr-original-style="" style="box-sizing: inherit;"></p><p fr-original-style="">We look forward to seeing you at our event.</p><p fr-original-style=""><br fr-original-style="" style="box-sizing: inherit;"></p><p fr-original-style="">Dan Mortensen</p><p fr-original-style="">AES PNW Section Chair&nbsp;</p><p fr-original-style="">2022-2025, 2016-18, 2011-12, 2004-07, 1996-97</p>

<div><strong>Presented by </strong></div><div><strong><br /></strong></div><div><strong>Jamie Angus-Whiteoak</strong></div><div>Emeritus Professor of Audio Technology at Salford University, UK</div><div><strong><br /></strong></div><div>and</div><div><strong><br /></strong></div><div><strong>The Pacific Northwest Section of the Audio Engineering Society</strong></div><div><strong><br /></strong></div><div><strong>Saturday, April 12, 2025 1pmPDT (UTC -7)</strong><strong><br /></strong><strong>Zoom only</strong></div><div><strong>"Doors" open at 12:30 so we can check audio and video without taking up meeting time.</strong></div><p style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;max-width:100%"><br /></p><div>Produced by Jess Berg and Dan Mortensen</div><div><br /></div><div>We welcome everyone to our meetings. You don’t have to be an AES member although we do encourage it. </div><div><br /></div><div>Tickets are free, but we do make it easy to donate directly to our Section There is no service fee for tickets or donations.</div><div><br /></div><div>This meeting is comparatively early on a Saturday so that our presenter can be with us from Europe, and to make it easier both for Europeans and East Coasters to join us. It’ll be in the wee hours in most of Asia; sorry about that!</div><div><strong> </strong></div><div><strong>Précis:</strong></div><div><br /></div><div>Although we do most of our audio processing in the digital domain these days, there are still places in the audio chain that require low noise analogue circuits. These are primarily at the beginning where transducers such as microphones, magnetic pick up cartridges, tape heads, etc. provide analogue signals that must be amplified prior to digitisation, and also at the converters (analogue to digital and digital to analogue) which often have challenging dynamic ranges to deal with. This requires low noise circuitry in order to handle the dynamic range of these systems.</div><div><br /></div><div>Unfortunately many of the texts on noise in analogue systems assume the presence of a resistive source impedance for the transducer or signal.  In audio this is seldom true because capacitor microphones, tape heads, and magnetic pick up cartridges have a significant, and often high reactive component in their impedances, plus the traditional resistive based noise analysis is insufficient.</div><div><br /></div><div>The purpose of this tutorial is to provide both an introduction to noise in audio circuits and a framework for analysing noise in valve/tube, transistor, FET/MOSFET, and Op-Amp circuits. </div><div><br /></div><div>The tutorial will be in two parts with question and answer sessions, and a break between them.  Each part will be around 45minutes, with a Q&amp;A session after each one.</div><div><br /></div><div>The first session will cover what sorts of noise occur in analogue circuits and devices.  It will also develop a framework for identifying which components would work best in different situations and look at basic approaches to achieving low noise operation for a variety of transducers. It also will provide some "rules of thumb" for good practice for low noise circuit design. </div><div><br /></div><div>The second session will look at some more advanced circuit topologies and strategies for achieving low noise circuits, particularly where a very wide dynamic range might be required. It will include conventional circuits, as well as some speculative ideas on how this might be achieved.</div><div><br /></div><div>Both sessions will have space for discussions and questions. The presenter will also endeavour to minimise the amount of mathematics involved. </div><div><br /></div><div>The sessions should be suitable for people who have never looked at low noise circuit design as well as, hopefully, having content that will appeal to people with some expertise in the subject.</div><div><br /></div><div><strong>About the Presenter:</strong></div><div><br /></div><div>Jamie Angus-Whiteoak is Emeritus Professor of Audio Technology at Salford University.<br />Her interest in audio was crystallized at age 11 when she visited the WOR studios in NYC on a school trip in 1967. After this she was hooked, and spent much of her free time studying audio, radio, synthesizers, and loudspeakers, and even managed to build some!<br />She has worked in both industry and academia in diverse fields from integrated optics and acoustics to analogue and digital signal processing. Her expertise ranges from valve (tube) circuits to the applications of esoteric number theory in signal processing. She has pioneered degree level courses in both music technology and electronic engineering in the UK.<br />She is the inventor of: modulated, wideband, and absorbing diffusers, direct processing of Super Audio CD signals, and one of the first 4-channel digital tape recorders. She has done work on signal processing, analogue circuits, and numerous other audio technology topics.<br />She has been active in the AES for 30 years and has been paper's co-chair for previous conventions as well as a judge for the student project and Matlab competitions.<br />She has been awarded an AES fellowship, the IOA Peter Barnet Memorial Award, and the AES Silver Medal Award and AES Gold Medal Award, both for "extraordinary contributions as an innovator and inventor in the fields of audio science, acoustics, and signal processing."<br />For relaxation she likes playing drums and dancing, but not at the same time.</div><p style="margin:0px;width:100%;line-height:1.5;box-sizing:inherit;max-width:100%"><br /></p><p style="box-sizing:inherit;width:878.285706px;margin:0px;line-height:1.5;font-style:normal;font-variant-caps:normal;font-weight:400;letter-spacing:0.25px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;-webkit-text-stroke-width:0px;text-decoration:none;max-width:100%">WE WELCOME ALL PEOPLE TO OUR MEETINGS. You don't need to be a member to join us.</p><p style="box-sizing:inherit;width:878.285706px;margin:0px;line-height:1.5;font-style:normal;font-variant-caps:normal;font-weight:400;letter-spacing:0.25px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;-webkit-text-stroke-width:0px;text-decoration:none;max-width:100%"><br /></p><p style="box-sizing:inherit;width:878.285706px;margin:0px;line-height:1.5;font-style:normal;font-variant-caps:normal;font-weight:400;letter-spacing:0.25px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;-webkit-text-stroke-width:0px;text-decoration:none;max-width:100%">We will start the Zoom 30 minutes early so we can be sure your audio and video work so that you can talk with us. </p><p style="box-sizing:inherit;width:878.285706px;margin:0px;line-height:1.5;font-style:normal;font-variant-caps:normal;font-weight:400;letter-spacing:0.25px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;-webkit-text-stroke-width:0px;text-decoration:none;max-width:100%"><br /></p><p style="box-sizing:inherit;width:878.285706px;margin:0px;line-height:1.5;font-style:normal;font-variant-caps:normal;font-weight:400;letter-spacing:0.25px;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;-webkit-text-stroke-width:0px;text-decoration:none;max-width:100%">We will hang out indefinitely after the meeting to chat with our audio friends.</p>

Pacific Northwest Section of the Audio Engineering Society

2025-04-12 Sat. 1pmPDT (UTC -7) AES PNW: A Compleat Tutorial on The Quiet Art of Noise in Analogue Audio Circuits with Jamie Angus-Whiteoak

General admission -Free

Free

General Admission plus $5.00 Donation

$5

General Admission plus $10.00 Donation

$10