January Meeting Notice

January 2007 Meeting Notice

Description

Radio interference is coupled into sound systems by four basic mechanisms. Solutions are straightforward and generally have minimal cost impact if implemented at the design stage. On the other hand, fixing problems after the fact can be costly, involving the work of skilled troubleshooters and lots of field labor.

This talk begins with a clear explanation of the coupling mechanisms, outlines design principles that cause them and others that avoid them, and provides strategies for troubleshooting and fixing problems that arise in the field with legacy equipment. The focus is on both the design of equipment and systems.

About the Speaker

Jim Brown got interested in music and radio as a teenager, falling in love with jazz and Bach, and qualifying for an amateur radio license before his 14th birthday. Three years later he received Amateur Extra Class and First Class Radiotelephone licenses, and entered the Electrical Engineering program at the University of Cincinnati. He received the BSEE in 1964 and has worked in broadcasting and professional audio since 1960. Since 1985, his consulting practice has specialized in the design of sound systems for worship, performance, and sports facilities. More recently, his focus has expanded to include research and consulting on EMC issues. During 2006, he relocated to Santa Cruz.

Mr. Brown is a Fellow of the AES, and a member of the Acoustical Society of America, the Society of Broadcast Engineers, and the Society of Motion Picture and Television Engineers, and has presented invited papers to all of those societies. He is a member of the AES Technical Committee on Acoustics and Sound Reinforcement, and the AES Standards Committee's Working Groups on Microphones, Intelligibility, Acoustic and Sound Source Modeling, Digital Audio Transmission, and Audio Connectors, and is Vice-Chair of the Standards Working Group on EMC and Chair of the AES Technical Committee on EMC. He is active on the ham bands as K9YC.

Address

DeAnza 3 Auditorium
Apple R&D Campus
10500 N DeAnza Blvd, Cupertino, CA, USA

Directions
Finding De Anza 3 Auditorium

De Anza 3 Auditorium is on the BACK side of the ground floor of Apple's De Anza 3 Building. De Anza 3 is a slightly older building located on the opposite side of Marianni Avenue from Infinity One and the Apple Campus Complex. (It is on the opposite side of the street if you are standing on the grass between Buildings 1 & 2.)

If you are arriving from 280, you have turned South on De Anza and are driving parallel to the Apple Campus, (Buildings 1-6), you will turn Left onto Marianni Avenue. Instead of turning into Apple Campus (Infinity Loop) on the left, instead turn right into the first driveway on the right, and drive to the back of the building around the right end, parking in the back parking lot. A set of double glass doors at the back of the building is the correct access - you will enter the glass doors and then go immediately right through the doors into the auditorium.