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Chicago AES Section

The Chicago AES Section welcomes members, non-members, and students to its meetings which are typically held at Shure Incorporated and around the Chicagoland area. If you have a meeting idea, please contact us. Meetings are free and there is an optional networking dinner prior to meetings, which has an associated fee.

Our website also contains a list of Past Meeting Reports and an Officer List. To find earlier meeting reports, view our archive of meeting recaps from 1997 to May 2015.

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Past Event: Balanced Armature Transducers: Evaluation and Simulation Techniques

Balanced Armature Transducers: Evaluation and Simulation Techniques

May 30, 2018 at 7:00 pm

Location: Shure Incorporated, 5800 W. Touhy Ave, Niles, IL 60714

Moderated by: Charles King

Speaker(s): Knowles Electronics

DESCRIPTION:

Balanced armature transducers (also known as receivers) are a loudspeaker commonly used in hearing aids, hearables, earphones and in-ear monitors. The presentation will give an overview of the balanced armature drivers, how they operate, and will be followed by an introduction to the simulation techniques that can be used to evaluate their performance.

Electrical and acoustical measurements are very reliable and can define the input and output from a real device or a simulation. These results help ground a simulation and ensure it is behaving like a real device. Full validation of the internal portion of the model can be difficult: these are very small devices, designed to fit inside the ear canal, and thus measurement of some very basic quantities can be physically difficult.

Just like traditional loudspeakers, dynamical analogies and SPICE simulations can simply model complete linear systems in the frequency domain. This is computationally very fast and can provide insight into the electrical, magnetic, mechanical, and acoustic components.

Finite element solvers can be used to model stiffness, mode shapes and magnetic non-linearity.  As FEA contains the actual part geometry and non-linear material properties, it is well suited to study how the device will function under a static load. Often these solutions will have millions of degrees of freedom and can take a long time to solve.

Algebraic differential equation solvers can be used to combine SPICE, FEA, and measured data into a single simulation. With this tool, the amplitude response, frequency response, and distortion caused by the non-linearities can be studied. 

The talk will examine strengths, weaknesses, and appropriate application of each of these individual techniques.
 

ABOUT THE PRESENTER:

Charles King is a Sr. Principal Engineer at Knowles Electronics in Itasca. He has worked for 20 years in research, simulation, product design and testing of a wide range of specialty transducers; developing products ranging from large outdoor warning sirens to ultra-miniature speakers used in hearing aids and in-ear monitors. He has designed balanced armature receivers, voice coil loudspeakers, compression drivers and horns as well as working with condenser microphones and optical devices. Prior to his formal engineering career he could be found in less formal locations as a live sound engineer. Charles has several patents, a degree in Electrical Engineering from California Polytechnic State University in San Luis Obispo, and previously served as Chair of the Chicago Section of the Audio Engineering Society. 

 

Other Business: Dinner (optional, but please RSVP) will begin at 6:30pm. Contact Giles Davis (gilesdavis@motorola.com) by Tuesday, May 29th if you would like to join us. Pizza and salad from Lou Malnati's will be provided. Please let Giles know if you have a preference for vegetarian, gluten-free, etc. Price is $10 for non-members and $8 for members and students (please bring cash).


Posted: Wednesday, May 16, 2018

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Past Event: "Auralization as a Design Tool" at Threshold Acoustics LLC

The National Arts Centre, Southam Hall Credit: Diamond Schmitt Architects (rendering and architectural design), Fisher Dachs Theatre Consultants, Engineering Harmonics, and Threshold Acoustics

The National Arts Centre, Southam Hall Credit: Diamond Schmitt Architects (rendering and architectural design), Fisher Dachs Theatre Consultants, Engineering Harmonics, and Threshold Acoustics

March 28, 2018 at 7:30 pm

Location: Threshold Acoustics LLC 141 West Jackson Blvd, Suite 2080 Chicago, IL 60604

Moderated by: Scott Pfeiffer

Speaker(s): Scott Pfeiffer, Nick Dulworth, and John Strong

NOTE: Due to space, this event will be limited to 36 participants. Attendees must RSVP to request a spot. Please send an email to Giles Davis (gilesdavis@motorola.com) to be added to the list. Please RSVP by March 26 (event may fill before then).

DESCRIPTION:

Auralization is used regularly in acoustic design, and is often over-hyped. It is not like hearing it before you build it, or a miracle of real-world fidelity. It is however, a way to bring musicians, owners, architects, and others into the conversation. Instead of discussing STC, RT, Clarity, Bass Ratio, Running Liveliness, or EDT, now we can listen together and explore – understand how changes in design become audible and meaningful.

We put the controls in the hands of the users. We present the capability and the shortcomings of the techniques, and we share all of the decisions we make on the way to the final outcome – there is no salesmanship in our technique.

John Strong, Nick Dulworth, and Scott Pfeiffer, with support from others on the team, will share the auralization process as implemented by Threshold Acoustics, you’ll get a chance to hear some auralizations that have moved projects toward their successful completion, and be invited to share your critiques and ideas for how it could be improved.

 


ABOUT THE PRESENTERS:
Scott Pfeiffer
For over two decades, Scott has participated in virtually every aspect of the acoustical consulting profession, from modeling and measurements to leading the design of complex rooms, audio and video installations, and electronic enhancement systems. He entered the field with a Bachelor of Science in Physics with Honors in Music from Moravian College, and then moved on to graduate studies in the Acoustics Laboratory at the Technical University of Denmark. Scott has been honored as a Fellow in the Acoustical Society of America for his accomplishments in the design of worship and performing arts spaces. He was keynote speaker at the University of Michigan’s 2013 Saturday Morning Physics conference, lecturing a rapt audience of 1,000 on physics, perception, and uniqueness.

Nick Dulworth
Nick has a background in classical recording, music composition, and mechanical design. As a recording engineer, he has recorded over 200 concerts including performances by the Emerson String Quartet, Emanuel Ax, Zuill Bailey, Pierre-Laurent Aimard, and Daniil Trifonov. Nick holds a master’s degree in Acoustics as well as bachelor’s degrees in Music Composition and Recording Arts from The Peabody Institute of the Johns Hopkins University. 

John Strong
John’s career in acoustics comprises design of facilities for performing and recording arts, education, and worship, across the US and internationally. He holds Bachelor’s degrees in electrical engineering and music theory from the University of Notre Dame, a Master’s degree in architectural acoustics from Rensselaer Polytechnic Institute, and lifelong experience as a performer in numerous musical genres. As a multi-instrumentalist, science lover, and compulsive tinkerer, he finds perpetual inspiration at the intersection of art and technology. He has presented to the Acoustical Society of America, Audio Engineering Society, and American Institute of Architects, and is a guest lecturer at the University of Notre Dame.

 

 


MAILING LIST:

Feel free to drop us a note at chicago.aes@gmail.com if you'd like any changes to how you receive our meeting announcements. As always, both members and non-members are welcome.

Other Business: Dinner (optional) will begin at 6:30 pm. Pizza and salad from Lou Malnati's will be provided. In your RSVP, please let Giles know if you will join us for dinner and if you have any dietary restrictions (vegetarian, gluten-free, etc). Price is $10 for non-members and $8 for members and students (please bring cash).

View Official Meeting Report


Posted: Sunday, March 11, 2018

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Past Event: Structural Acoustics: A Technical Review (or, "What Do You Mean That Partition Is Actually a Loudspeaker!?!?")

Structural Acoustics: A Technical Review (or, "What Do You Mean That Partition Is Actually a Loudspeaker!?!?")

January 31, 2018 at 7:30 pm

Location: Shure Incorporated, 5800 W. Touhy Ave, Niles, IL 60714

Moderated by: Steve Rittmueller

Speaker(s): Masonite

 DESCRIPTION:

 

Structural acoustics is the study of how sound is transmitted to and within structures, both airborne and structure-born. The presentation includes 1) a review of the mechanisms of the propagation of sound within the built environment (primarily air-borne), 2) the derivation of the first-order as well as some more advanced approximations to the acoustical performance of structures, and 3) a review of published data for some common construction configurations, including comparisons to theoretical results.

ABOUT THE PRESENTER:
Steve Rittmueller is an acoustical engineer with 20+ years of experience across various fields of acoustics. He started his career in acoustics working for US Robotics with a focus on the interaction between the mechanical design and the performance effectiveness of speakerphones. This was preceded by a stint in the automotive world where he worked on analog electronics and DSP algorithms (noise cancellation, acoustic echo cancellation, speech recognition, etc.) to improve the in-vehicle experience for Motorola and a startup in Southeast Michigan. Steve spent several years developing acoustic transducers and methods of quantifying their performance for Knowles Electronics.  Steve is currently a research engineer for acoustics for Masonite, the leading supplier of doors to various markets with a wide variety of acoustically rated products. Steve is active within the ASTM and is currently the chair of subcommittee E33.07, “Definitions and Editorial” within E33, “On Building and Environmental Acoustics”.

 

Other Business: Dinner (optional, but please RSVP) will begin at 6:30pm. Contact Giles Davis (gilesdavis@motorola.com) by Tuesday, January 30th if you would like to join us. Pizza and salad from Lou Malnati's will be provided. Please let Giles know if you have a preference for vegetarian, gluten-free, etc. Price is $10 for non-members and $8 for members and students (please bring cash).

View Official Meeting Report


Posted: Wednesday, January 24, 2018

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AES - Audio Engineering Society