RF Noise, Hums and Buzzes in Audio Systems
Jim Brown, Audio systems Group, Chicago, Il USA
Duran Audio Training Center Let op: Dit is niet bij de fabriek in Zaltbommel !!!!!!!!!!!!!!!!
Engelen ('s Hertogenbosch)
20:00 uur (vanaf 19:30 koffie, om 19:45 toelichting op de avond)
Moeilijk, de dichtstbijzijnde bushalte is 15 min lopen. Zie verder http://www.9292ov.nl/
Op de A59, neem afslag 46, Engelen/ industrieterrein "de Vutter". Neem de 2e weg rechts, volgen tot in Engelen. In Engelen wederom de 2e rechts (de Vlacie). De Achterstraat is de 2e straat rechts.
Zie verder ANWB routeplanner (let op, zoek onder 's Hertogenbosch, niet onder Engelen)
Ben Kok, zie bestuur
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Vanavond heeft Duran Audio hun nieuwe trainingslokaal ter beschikking gesteld. Tevens spelen zij in op het onderwerp van vanavond met wat demonstratieopstellingen welke tijdens de pauze bezichtigd kunnen worden.
De lezing: For most of the past four years, Jim Brown has been engaged in research into the causes of RF interference to audio systems. Most of that work builds on the work of Neil Muncy. In a series of AES papers Mr. Brown has shown that the natural behavior of audio cables as antennas, pin 1 problems, inadequate RF filtering at equipment inputs and outputs, and a cable defect called "shield-current-induced noise" (SCIN) are the primary causes of RF interference to sound systems. His most recent paper, presented in New York last fall, showed how simple ferrite chokes can be used to eliminate interference.
Mr. Brown's presentation will focus on understanding, preventing, and eliminating hum, buzz, and RF interference to audio systems.
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.
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 several AES Standards Committee's Working Groups.