Coming July 15, 2020 starting at 9AM EDT with presentations from some of the industry’s best.
Registration open now! Attendance is FREE for Members and non-Members as a service to our industry during this global pandemic.
New Way of Sound Reproduction 9AM EDT- 10AM (This session postponed to a later date. Sorry!)
By Simon Dinaburg- Dinaburg Technology
Since the Rice-Kellogg patent from 1924, electrodynamic loudspeaker transducers have virtually remained unchanged with a single, continuous speaker cone vibrating to produce sound. Dinaburg Technology has a patented technology that fundamentally changes the way sound is produced from an electrodynamic transducer based on fundamental principles of physics, namely Boyle’s law, where the pressure-volume ratio in front of, and behind, the vibrating cone surface is balanced. This presentation will explain the basic theory and test results will be presented comparing the performance of this new transducer design versus a conventional design based on the Rice-Kellogg patent.
VIRTUAL PRODUCT DEVELOPMENT OF AUDIO SYSTEMS 10:30AM EDT to 11:15AM
By Alfred J. Svobodnik, Tommaso Nizzoli, Ralph Haddad, Thomas Gmeiner- Mvoid
Virtual product development has become an important tool in the creation of new acoustic products. Simulation technologies have been developed to reduce the iterations and number of prototypes, which turned out especially attractive in automotive. The priorities in professional audio are in principle the same: Reduce time and cost and still get a better product.
By introducing virtual methods, the development process changes:
• The product definition at the beginning can be largely expanded to trying out different variants of virtual prototypes. The listening session is at the beginning, not at the end.
• The term “best product” becomes more specific by meaning the “optimised product for a set of functions”. From the requirements, numerical optimisation methods can find the “sweet spot” between all the trade-offs to be made.
In the tutorial, we examine the product development processes in professional audio, consumer and automotive. An overview of virtual methods and tools is presented. Opportunities as well as restrictions are discussed.
Examples are presented in live demos, exploring all the levels where simulation can support or change the development process.
Multidomain Modeling of Speaker Nonlinearities with Simulink and Simscape 11:30AM EDT to 11:55AM
By Stephen Thompson, PhD- Penn State University
Multidomain modeling of acoustic transducers can be implemented in many ways, from older analog circuit tools such as SPICE to modern multidomain FEA tools. Each level of model complexity has its place. An intermediate level of complexity is available with tools such as those that use Modelica or Simscape. These are not full partial differential solvers. They use a combination of ordinary differential equations and algebraic equations to calculate the performance in each physical domain (e.g. mechanical, electrical, magnetic, etc.) and provide the necessary physical coupling between the domains. They provide reasonable fidelity with less computational intensity, so they can be used as components in a larger modeling system that includes programmable controls to reduce distortion or energy losses.
This seminar will demonstrate the use of Simscape to model a moving coil speaker including multiple nonlinearities. It will demonstrate the ability to model a control system around the speaker for improved far field performance.
Tips for creating effective ANC systems in wireless earphones and hearables Noon EDT – 12:45PM
By Tom Miller- Knowles Corp.
ANC is becoming an increasingly popular option in wireless earphones but there isn’t a lot of detailed information available to assist with implementation. In this presentation Tom will share what he learned in his own development work, covering many of the factors needed to provide good noise reduction in small headsets. He will show how to keep an ANC system stable across a variety of wearers, dispelling some myths about latency and stability. Also discussed will be how to make good use of balanced armature devices in ANC systems, including increasingly popular hybrid dynamic-BA combinations, without disrupting stability.
What Is New In Materials for the Speaker Industry 1PM EDT – 1:30PM
By Mike Klasco- Menlo Scientific
Rescheduled to our July 15 event
By Mike Klasco, Menlo Scientific
Over the last few decades we have all grown complacent with sourcing our products, or at least most of our components, from China. Long established relationships, trustworthy suppliers that know what we want and need, are losing their position as viable vendors. The rising cost of goods from China, the tariff war, the Hong Kong struggle with Beijing, and now the corona Virus have reached the tipping point and staggered what was once the obvious country of choice for audio products. The tariff war was sold as re-shoring – bringing our production back home – yet it seems that we have just further burdened ourselves with adding the tariff to ourselves and sent most of us looking elsewhere in Asia for new suppliers.
Vietnam, Philippines, Indonesia, Malaysia, Thailand, India, not to mention Korea, Myanmar and Cambodia – are all getting finding themselves bathed in the first waves of brands exploring their options. We will review the landscape of long established as well as new speaker factories.
What about bringing the audio business back home? We have the stick of tariffs that we have beat ourselves with, how about the carrot of tax incentives, grants and matching funds for R&D –perhaps these perks contingent on the new technology built in the U.S. ideally in state-of-the art factories similarly incentivized.
Finally, a discussion of how should ALTI help its members navigate through the storm?
Warkwyn Associates Facility Tour 3PM EDT to 3:30PM
By Kent Peterson- Warkwyn Associates
In the Spring of 2019 Warkwyn’s parent company; MISCO built a completely new speaker factory and moved a short distance from Minneapolis, over the Mississippi River, and to Saint Paul Minnesota. This afforded Warkwyn to build completely new lab, demo, listening and sales spaces to conduct business. Please join Warkwyn for a quick spin around the new spaces in a virtual tour where we can show where and how we do business, our capabilities, and where and how we use both Microflown and Klippel instrumentation.
COMSOL Multiphysics Workshop 4PM EDT – 5:30PM
By Kirill Shaposhnikov- COMSOL
This workshop will be divided into two sessions. In the first session, we will give an overview on the capabilities of COMSOL Multiphysics in loudspeaker simulation to different level of complexities. A specific model example will be presented to showcase how COMSOL may be used not only to simulate the behavior of a loudspeaker but also to optimize its design to the desired specifications.
In the second session, the attendees will have a chance to use the trial software to create a simplified loudspeaker model right in the classroom by following the leader. You are able to learn the basic work flow in creating a multiphysics model inside COMSOL that includes defining global parameters, importing CAD models, setting up acoustic-structure interaction physics, meshing, solving, and postprocessing.
Prior sign up to the 2nd half hands-on session it is required to get a trial license so that the COMSOL Multiphysics software can be downloaded beforehand. (NOTE: Details of preregistration will be posted in July. Bring your laptop or media device to participate in the hands-on segment. There is no fee to attend this workshop)
Linking Cost, Performance, End-User Satisfaction by Physical and Perceptual Assessment 6PM EDT – 7:30PM
NOTE: This is a prerecorded extended version of the 30 minute session presented at Virtual ALTI-EXPO in June
By Wolfgang Klippel- Klippel GmbH
This tutorial discusses the maximization of the end-user value, which determines the success in the market. The end-user value can be described more practically by the performance/cost ratio which considers physical, perceptual and other non-technical features and the cost structure of the product.
The discussion starts with the target performance as seen by the end-user, which is the basis for the development. The tutorial focuses on the assessment of the sound quality and discusses listening tests, auralization techniques and perceptual modeling to define the audibility threshold and the impact on the end-user value to generate acceptable tolerances. Those are required to generate meaningful specifications and PASS/FAIL limits. The manufacturing process should provide the defined performance at minimum production cost and with practical risk management (prevent field rejects). The discussion ends with new opportunities provided by digital signal processing and electrical control for in-situ monitoring and improving the performance, endurance and reliability of the product in the final application.