Networking, Career Building, and Doing Business are BIG Features at AISE. BUT…
CONTENT IS KING!
AISE education content has been internationally recognized as top notch and cutting edge. On this page we will give a glimpse of the content coming to AISE2019. It will be updated weekly as new submissions come in so check back often.
Note that we will break it down by category and type; Business Content, Technical Content, and Advertorials. Seminars are 1 hour or more. Papers are 20 to 30 minutes. Tracks are several hours to full day with various types of content. You’re going to want to be here!
Our content is broken down by the following classifications:
Seminars- 1 hour or more academic only content
Papers- 20 to 30 minutes academic only content
Advertorials- 20 to 30 minutes to discuss products and services from a sponsoring company or individual
Forum- Panel or Round Table discussion about issues, technology, or education content
Speaker Builders Workshop (SBW) will be a full day track with several presenters on June 10, 2019. Content Abstracts are presented in order of submission. This track will have content for ALL phases of business, management, technical content, and marketing. The goal is to show the production path of a new speaker product from conecption to post production testing.
The Loudspeaker Design Challenge (Paper)
Speaker: Justin Zazzi
Do you know how to describe the transducer you need for your product? Does it take too many design iterations or sample requests to finally get the transducer you wanted? Do you know how to communicate your design intent when working with a transducer company, so the first sample is exactly what you want?
When requesting a transducer from a manufacturer, translating your performance goals into specifications is not easy. The secret is, you don’t have to be an expert in Thiele/Small parameters and other technical details! If you can describe your product’s design intent using certain key concepts, the transducer company will have a clear idea of your goals and they can create the best specification for you. When the transducer company has a complete understanding of the project, the first sample you receive is the only sample you need.
This presentation will explore how a customer’s qualitative description can be turned into a quantitative set of specifications required for manufacturing. Join us to learn which key concepts to use when describing a project to ensure the transducer company can make the best transducer for your project.
Using COMSOL Multiphysics® for Loudspeaker Designs (Seminar)
Speaker: Jinlan Huang, Ph.D., Applications Engineer, COMSOL, Inc., Burlington, MA
In this workshop we are going to demonstrate how you can use COMSOL Multiphysics® to simulate a generic loudspeaker driver provided by Eminence and the sound field it generates, a complicated multiphysics problem that involves solving Magnetic Fields, Solid Mechanics, and Pressure Acoustics as well as the interaction between them. The comprehensive multiphysics model has been packaged into an app with customized interface using the Application Builder, a built in feature within COMSOL Multiphysics®, for the attendees to download during the class and change some design variables (such as cone thickness, cone material, or coil parameters etc.) to see how they affect the performance of the loudspeaker for frequencies of interest. We’ll conclude with a brief overview of the acoustic and vibration modeling capabilities inside COMSOL, especially in the areas of electroacoustic transducers including loudspeakers and microphones.
SPLmax – Using Standards to Maximize the Loudspeaker Output (Seminar)
Speakers: Stephan Shonfeld
The new standard IEC 60268-21 defines acoustical measurements for assessing the sound pressure output of active and passive loudspeaker systems. It introduces a powerful characteristic SPLmax that corresponds to the maximum sound pressure level generated by a broadband stimulus (e.g. noise), on-axis at a specified distance (e.g. 1 m). The manufacturer rates this value for specified measurement conditions and a defined stimulus considering the requirements in the particular application and verifying that the device under test can handle this amplitude over 100 h. This presentation discusses and shows in practical experiments various test methods (e.g. as proposed by CEA 2034) applied to find the thermal and mechanical limits of SPLmax and addresses the practical use of the rated SPLmax for gain adjustment in active system testing.
Green Speaker Design Part 2: Optimal Use of System Resources (Seminar)
By Wolfgang Klippel
Increasing the efficiency and voltage sensitivity of the electro-acoustical conversion is the key to modern audio devices generating the required sound output with minimum size, weight, cost and energy. Traditional loudspeaker design sacrifices efficiency for sound quality. Green speaker design is a new concept that exploits digital signal processing in order to use hardware resources more effectively. A first seminar presented at the AISE 2018 showed the potential of transducers maximized for efficiency by using a short voice coil overhang and soft suspension and operated by nonlinear adaptive control to cancel the nonlinear distortion and to actively stabilize and protect the voice coil. This second seminar applies the new paradigm to the overall system design and shows the consequences for enclosure, panels, passive resonator, amplifier, cables and DSP.
COMSOL Multiphysics (Advertorial)
By Jinlan Huang- COMSOL
In this talk, 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 when a full transient analysis of a loudspeaker driver is performed.
The analysis accounts for nonlinear behavior of the soft iron in the magnetic system, geometric nonlinearities in the structures, and nonlinear effects due to the topology change when the voice coil is moving in and out of the magnetic gap. The model uses the moving mesh feature and automatic remeshing to capture the topology changes and the movement of the voice coil.
The output includes the total harmonic distortion (THD) and the dynamic BL curve. The model also describes how to calculate the intermodulation distortion (IMD).
Research on Effects of Inter-Element Spacing on Gradient Inverted Stack Performance (Paper)
Throughout my undergraduate thesis research for the Honors Program at Belmont University, I have tried to expand on research started by Merlijn Van Veen on the real-world performance concerns that result from different cardioid array configurations. Most loudspeaker manufacturers have created amplifier presets or configurations based on a three to four speaker “cluster” array that may have adjusted timings to compensate for a shifted acoustic center as explained in AES paper 7992. Deploying speakers in larger clusters than recommended can result in less than ideal performance if not verified and adjusted. The gradient inverted stack is an efficient and powerful directional subwoofer array but has been found to have reduced effectiveness as array size increases. The increased baffle size of stacked enclosures reduces diffraction and creates level differences, especially at high sub frequencies. I am currently still testing more enclosure types and array spacings.
Testing My SmartHome
By Jesse Gratke- HEAD acoustics
I’ve recently built a house and had the opportunity to integrate a whole home audio system, a on-line security system, and a majority of my appliances and electronics with voice interfaces. How do I know that I did a good job implementing the systems? There aren’t really any standards to measure most of these devices and applications, so what options do you have?
I’ve collected data for these devices using some established and some new methods. I will present the data and detail how good of a job I did on the design, development, and validation of the SmartHome system. The SmartHome testing involves microphones, loudspeakers, speech recognition, hands free communication, and audio quality.
Headphone Testing (Paper)
By Jesse Gratke
I’ve tested over-the-ear, on-ear, and in-ear headphones. The headphones covered wired, wireless, and True Wireless technologies as well as Active Noise Canceling (ANC), passive, and noise isolating. I was able to determine which headphones had the best performance in the presence of noise and also produced the best sound quality. The data was published in CHIP magazine and by the Good Housekeeping Institute.
The testing methods used were unique and even presented at AISE 2018 by my colleague Jacob Soendergaard. This paper would build off what was already done and offers new conclusions that are both surprising and expected.
The Power of Brand (2nd Edition) (Seminar)
By Adrian Weidmann- StoreStream Metrics
This workshop will define ‘Brand’ and explore its power and importance for the commercial success for you, your product development and/or service. Developing, defining and maintaining your brand and its message may the most important ‘product’ you will ever develop. This session will introduce and identify seven key components that you can use to define your brand. The session will include an innovative and active workshop exercise where you and your colleagues will work together collaboratively in developing a brand story. This workshop will give you the tools to help you establish your own Brand.
The ‘Brand as Publisher’ concept will be introduced, defined and examples will be presented that can be used to create a meaningful dialog between your customers and your brand across available customer touchpoints- human, mobile, social media, web and print. Understanding the power of this personalized customer dialog can provide innovative insights for you, your product development and entire team as well as propel your Brand forward.
StoreStream Metrics will conduct a free predictive customer viewing assessment of their product in a client environment, online or print advertisement for each session registrant. This assessment can provide invaluable recommendations to optimize the impact and efficacy of your brand message.
Thermal Benefits of Ferrofluid in Loudspeakers (Paper)
By Vanessa Rene- Ferrotec
The first commercial use of ferrofluid in loudspeakers was 45 years ago, in 1973. Since that time, the market has grown to more than 300 speaker manufacturers around the world using Ferrotec ferrofluids. In annual numbers, there are over 300,000,000 speakers benefitting from the use of ferrofluid for heat transfer, damping, enhanced linearity (centering) to reduce field failures and decrease distortion. Ferrofluid has been utilized by some of these customers now for 30+ years. This presentation will focus on the significant ability of ferrofluid to increase heat transfer, allowing for speakers to expand their performance limits and/or insure long-term integrity.
Smart Speakers Compared (paper)
By Jacob Soendergaard- Telecon Account Manager HEAD acoustics
Smart Speakers have been on the market for a while now, and has seen significant improvements in their acoustic performance and speech recognition capabilities. As consumers start to become more comfortable with these devices, they also will demand more of them.
This presentation will examine the current state of some popular Smart devices that feature Voice Assistants, and present data on how they compare for both human-to-human conversational ability (where applicable), as well as for human-to-machine performance.
Audio’s Ultimate Fighting Championship – Sound Cards versus Audio Analyzers
By Daniel Foley- Audio Precision and President ALMA International (Seminar Presented at InfoComm)
Sound cards have greatly improved over the years to the point that published specifications rival that of dedicated audio test and measurement equipment. However, sound cards have many shortcomings when used as an audio test interface. Output and input impedances are often not appropriate, maximum input voltage typically too low, and lack of input and output ranging can degrade audio measurements. This presentation will focus on where sound cards can potentially be used for audio testing and why investing in a dedicated audio analyzer ensures accurate and repeatable measurements which better predicts performance in the field and may save time and money during system installs and commissioning.
Loudspeaker Specifications: A Basic Understanding Turns Confusion into Profitability
By Mark Beach- Beach Dynamics and Treasurer ALMA International (Seminar Presented at Infocomm)
Confused by the loudspeaker alphabet jargon: Qts, EBP, Xmax, Fb, Vb, and others? You are not alone! And more importantly, which are critical to make your project trouble free and profitable? This presentation starts with a basic explanation of loudspeaker operation before exploring Thiele-Small parameters, resonant frequencies, BL-curves, and many others. We will explore simple, usable, practical application of essential specs. With an understanding of the loudspeaker alphabet, the attendee will be able to identify which loudspeaker characteristics are important for their project, become more profitable, reduce call backs and repairs, and maintain satisfied customers.
Global Trade Wars – How To Be Prepared For Your Supply Chain Future
By Rosemary Coates- Executive Director Reshoring Institute (seminar)
Panic. That’s what many companies are feeling now that nearly 6,000 Harmonized Tariff Schedule (HTS) item classifications have been identified for the imposition of a 25% penalty tariff on U.S. imports from China. Steel and aluminum tariffs apply more broadly to imports from many countries. China has retaliated with tariffs of their own. Other countries may be brought into the trade wars, too. There are non-tariff trade wars now, too.
It appears that the trade wars aren’t going to end anytime soon. So what action should you take now to mitigate the effect on supply chains? What is your company’s tariff strategy? Even if the tariffs and trade wars don’t affect your company, have you developed a supply chain strategy?
We will discuss strategies such as sourcing from alternate low-cost countries; global inventory strategies, use of Foreign Trade Zones, and passing costs on to your customers
Ultra-fast EoL-Testing with Maximum Sensitivity for Loudspeaker Defects (paper)
By Stephan Schonfeld- R&D Development Engineer Klippel GmbH
Measurement time is a crucial factor for the total cost and feasibility of end-of-line quality control. This paper discusses new strategies minimizing the test time for transducers and audio systems while ensuring high sensitivity of defect detection, extracting comprehensive diagnostics information and using available resources in the best possible way. Modern production lines are fully automated and benefit highly from high speed testing. Optimal test stimuli and sophisticated processing in combination with multi-channel test design are the key factors for smart testing. Finally, typical concerns and pitfalls when testing at high speed are addressed and illustrated by measurement results.
Minimizing Costs in Audio Devices through Efficient End-of-line Testing (Paper)
By Wolfgang Klippel
Variances in the parts and uncertainties in the assembling process degrade the performance and the reliability of the manufactured devices. Defective units increase the manufacturing cost if detected during end-of-line testing or increase the after-sales cost if an undetected failure occurs in the field. This paper addresses the role of end-of-line testing in reducing both kinds of failures and maximizing the performance/cost ratio as seen by the end-user. The selection of sensitive and fast measurements, which can be performed under manufacturing condition, is the basis for the PASS/FAIL classification. The paper shows that optimal production limits used in EoL-testing minimize the overall cost by considering a clear product definition, information from the particular design, statistical data from manufacturing process and traceability of the field rejects. The general concept presented here is illustrated using practical examples from automotive and other applications.
Challenges and best practices for microphone end-of-line testing
By Gregor Schmidle- NTi Audio (Paper)
Due to the increasing use of microphones in many applications such as automotive or artificial intelligence, the demand for fast and reliable microphone test processes is growing. This paper covers various aspects of the design of an EOL microphone test system. A prevailing challenge is to properly control the sound source, as loudspeakers have a tendency to vary their performance due to many influences. The acoustic environment for the test must provide reproducible conditions and is ideally anechoic. Noise from outside must be damped across the measurement bandwidth, so that it doesn’t affect the results. Different testing requirements for various types of microphones are shown. Different methods for defining limit criteria are discussed.
Transducer Modeling using SPICE, SimScape, or Modelica (seminar)
By Stephen C Thompson- Penn State University
The methods of analog circuit modeling have long been available for linear models acoustic transducers. Linear (or linearized) models for dynamic and condenser microphones, moving coil speakers and balanced armature transducers often appear in the literature. Calculations are often performed using circuit modeling programs such as SPICE.
More complete models that include several kinds of nonlinear behavior are now also possible using SimScape from The MathWorks, and using modeling codes based on the Modelica modeling language. Some version s of SPICE also have sufficiently flexible nonlinear capabilities to model acoustic transducers. LTspice and OpenModelica are freely available codes with significant capability. This seminar will provide an overview of linear and nonlinear modeling of acoutic transducers using these programs.
Dissecting the Audio Principles of the Balanced Mode Radiator (paper)
By Tim Whitwell- Tectonic Audio Labs
The presentation will inform the audience of the acoustic principles associated with a balanced mode radiator (BMR) transducer. It will address the limitations of a pistonic transducer and introduce the core concepts of the modal behavior in a free disk. This will lead into a discussion of the benefits and design freedoms that a BMR transducer can provide to the loudspeaker engineer.
Enhanced QC Measurements and FINE Upgrades (paper)
By Peter Larsen- LOUDSOFT
QC testing individual Rub & Buzz and levels with 2 microphones plus test of external microphone(s) etc. Full QC automation with automatic sorting of failure types.
FINE X-over/DSP with Voltage curves and drag/drop of responses. FINEBox with compensated reflex volume simulations and FINEMotor with variable backplate thickness.
What’s Old is New Again (seminar)
Using Modern Analysis Tools to Recreate an Iconic Speaker of the Past
By Tom James- MISCO and Kent Peterson- Warkwyn
Recording engineers are a fickle lot. Once they come to appreciate a tool in their arsenal it is very difficult to pry it from their ears as it has found a way into their sonic toolbox and helps them define their sound, work more efficiently, cost effectively, and have confidence in their audio delivery.
Not many things embody this idea more than the venerable Yamaha NS10M nearfield studio monitor. So much has been written about this speaker and it’s ubiquity in the studio is stuff of studio legend. It may even be correct to state that more Grammy winning albums have been heard through an NS10M than any monitoring system ever invented.
However in 2001 Yamaha decided to retire the model after a 23 year run with replacement parts, including the woofer, becoming scarcer over the ensuing decades. This prompted a number of transducer manufacturer’s to attempt to reproduce the unique woofer as literally, hundreds of thousands of NS10’s were out there slowly being relegated to the studio junk closet once their woofers had given up the ghost.
These replacement woofers have always been suspect. Not that they weren’t fine replacement woofers, many of them eclipsing the build quality of the original. But were they “correct”? Did they deliver the goods where the original shined? By and large the opinion was no; if you wanted to hear your NS10M’s again you were going to compromise always knowing that you weren’t hearing what you bought the monitors for in the first place.
Enter Bold North Audio (an exciting new MISCO brand), and in partnership with Warkwyn (exclusive North American Klippel reps), a decision was made to get to the bottom of what made the original NS10M woofer so unique. The main target? Make the speaker as close to the original as possible- not improve upon it. Utilizing groundbreaking Klippel technologies the team deconstructed the transducer with laser scanning vibrometry, near field holography, materials parameter measurements and hundreds of hours of listening by the team and some of the most trusted and highly regarded ears in recording.
This session will follow that journey, revealing pitfalls, “a-ha” moments, modern measurement techniques and comparative results which ultimately resulted in a faithful reproduction of that venerable woofer.
Advantages of Using Lab Grade Test and Measurement Microphones in Audio Applications (paper)
By Mark Valentino- PCB Piezotronics
This technical session on acoustics will address the differences of test and measurement lab grade microphones when compared to audio grade microphones and the advantages of each.
Specifications concerning inherent noise floor, distortion rating, phase, and flat frequency response will be reviewed. The advantages will be tied to applications common within the audio industry such as: speaker design, live sound recording, headphone and earbud testing, high quality studio recording, and modeling of other microphone amplifiers and musical instruments.
Power Considerations for Distortion Reduction of Loudspeakers (paper)
By Doug Button- DJB Enterprises
Over the last 25 years, scientists and engineers have written extensively about methods to reduce distortion in
loudspeakers with Digital Signal Processing (DSP). Despite the several proposed solutions, no formal product
exists on the market today that employs distortion reduction. In this paper, the answer to some fundamental
questions about what is required to make substantial improvements in loudspeaker performance is investigated
through computer simulations. This research examines the level of volume achievable while still maintaining
acceptable levels of distortion. Transducer designs that are best suited for this application are studied and
New Stuff for Product Designers – Part 1 headphones (seminar)
New Stuff for Product Designers – Part 2 mics and speakers (seminar)
The advances in materials science in the last few years for audio has been remarkable. In this session we will cover the latest in materials now being used for and being planned for the next generation audio products. New plastics are stiffer and better damped than commodity plastics result in less enclosure buzz and smoother response. Carbon fiber thermoplastic composites enable lighter and more robust product design. Noise canceling and echo canceler products especially benefit from these materials. Nano-materials enhance water repellent surface treatments to wind screens. Ongoing development of graphene for microphones, headphones, and microspeakers promises significant performance advances. Elastic (helical conductor) audio cables provide elongation to 40%! You will see examples of the materials available so a product developer can ride the next wave of ultra-materials.
New Audio Signal Processing and Machine Learning Algorithms (seminar)
By Brandon Carroll- Georgia Tech
Recent research at Georgia Tech has led to the development of new audio signal processing and machine learning algorithms that characterize environmental audio. Given sample recordings, these algorithms learn a model of the different types of sounds present in the environment and give a statistical measure of how similar or different future audio is to the baseline conditions from which the model was learned. The model incorporates information about the structure, characteristics, and levels of the different types of sounds present in the environment.
These algorithms are efficient enough to run on cheap hardware and are easy to apply to new environments without the need for tedious labeling of training data. This makes them attractive for many applications where machine learning has typically not been applied due to the cost of labeling data or of obtaining the required computational resources.
Better sound, smaller speakers: A Materials Engineering Perspective
By Md Mehedi – Sr. Application Development Engineer, Consumer Electronics
Carpenter Technology Corporation, United States
How can designers improve the sound quality of next-generation audio products when the market is demanding smaller devices? Bigger sound requires bigger speakers, right? Not necessarily. One approach is to re-evaluate the materials you are using. Alloy materials used within speakers to conduct sound has not changed drastically in the last 10-15 years. However, developments in the performance of soft-magnetic alloys can replace standard electrical iron/ low carbon steel and provide higher efficiency and performance. The result is better sound quality, smaller devices, extended battery life, and even cost savings. Join our talk to learn about high-performance soft-magnetic material solutions that will improve sound quality and size requirements that your customers are asking for. Technical details and modeling data will be presented to demonstrate output improvements.
Smarter Measurements for Smarter Speakers (seminar)
By Steve Temme- Listen, Inc.
Learn how to test smart speakers, hearables, watches and other wearables, robots, smart home devices, automotive entertainment systems and other smart devices in our practical half-day seminar taught by industry expert Steve Temme of Listen, Inc.
Although acoustic testing of smart speakers and other voice-activated devices presents challenges such as injecting and extracting response signals, time delays, and triggering the system using voice commands, it is still possible to measure the same parameters as traditional loudspeakers. In addition we can also measure microphone array performance, speakerphone performance and more.
We demonstrate how to do this, focusing on:
- Stimulating and capturing responses from a device where you don’t have direct access to the microphone or speaker (open loop testing).
- Delays, asynchronous stimulus / acquisition, and working with the ‘cloud’
- Testing with real world signals such as speech and music, and how to analyze results from these test stimuli
- Voice Recognition – key word spotting, wake word testing, directionality, and the effect of background noise on voice recognition performance
- Telephony – testing smart speakers for hands-free calling
Testing Smart Headphones (paper)
By Steve Temme- Listen,Inc
Smart headphones or “hearables” are notoriously complex to test. They have numerous interfaces from Bluetooth to cloud-based/Wi-Fi, and contain much signal processing, both on the record side (e.g. beam-forming, background noise filtering) and on the playback side (e.g. loudness and active noise cancellation). This means that their characteristics change according to ‘real world’ conditions such as the physical setup and background noise. Furthermore, their multifunctional nature means that there are many aspects of the device that may need to be tested, ranging from voice recognition to music playback or even operation as a telephone headset. Due to their complex non-linear use cases, these devices often need to be tested at different levels and different environmental conditions, e.g. different physical setups and background noise, different signals etc. Although as yet there are no standards for testing smart devices, we can borrow principles and test configurations from many other audio devices, and use existing standards such as ETSI background noise and telephone test standards. Flexibility of the test system, and experience with testing a wide range of acoustic devices is critical to enable a device to be completely characterized. In this paper, we will discuss how to implement basic acoustic tests and then discuss some of the more complex real-world tests that may be carried out on smart headphones and similar devices, along with the techniques and standards that may be used. Finally, we present a check list of the test-system functionality you should look for when choosing a system to fully characterize a smart headphone or other smart device.
Testing automotive speakers and microphones with SoundCheck and the Mentor A2B Interface (advertorial)
Les Quindipan – Listen, Inc.
In this short presentation we will demonstrate how automotive speakers and microphones that use the Analog Devices A2B digital bus can be easily tested using the Mentor A2B interface with SoundCheck. The Mentor Analyzer, which handles the transmission of signal in to and out of the bus, is viewed as an ASIO interface by SoundCheck, enabling SoundCheck to read/write to the device and therefore analyze any transducer connected to the A2B bus. A custom VI permits control of the Mentor A2B interface configuration via SoundCheck. This means that it can be controlled from within a SoundCheck sequence, for example loading configurations and starting/stopping ASIO streams, making testing easier and faster in high volume production line situations as well as the R&D laboratory.