AES 110th Convention Heyser Lecture



Dr. Per Bruel New York, March, 2001-The Audio Engineering Society's Richard C. Heyser Memorial Lecture Series taking place Sunday, May 15 during 110th AES Convention in Amsterdam, will feature an address by distinguished lecturer, inventor, and mentor of acoustic measurements, Dr. Per Bruel of Bruel Acoustics.

Dr. Bruel's lecture, "Acoustics in Small Studios," will address how acoustics of small studios can best be evaluated. In 1942 it was found that the acoustics in radio studios should not be evaluated by famous conductors, or well-known critics, but by the performers using the space. Acoustics intended for the listeners could be obtained by changing the position of the microphones. Today we are able to use RASTI for evaluating clearness-RASTI with a head & torso microphone, as opposed to the present omni-directional microphone. Dr. Bruel will share his thoughts on artificial reverberation and discuss which weighing curve should be used for testing the sound level, A-B-C or D.

Dr. Bruel has made many significant contributions to the world of audio and acoustics. He was the assistant to the famous Professor P.O. Pederson, who worked with Valdemar Poulsen to create the first tape recorder. This same team produced the first continuous radio waves with a hydrogen-arch, which enabled them to speak via radio link in 1915. In 1939 Dr. Bruel constructed the first acoustic analyzer with constant percentage bandwidth, and in 1941 in collaboration with Viggo Kjaer established Bruel and Kjaer, Danish company known for the excellence of acoustic and electronic instrumentation. In 40 years, the company grew to 3200 employees. In 1942 Dr. Br¸el established the first acoustical laboratory in Sweden at Chalmers Technical University in Gothenburg where he taught acoustics. During this period many acoustic instruments were developed e.g. condenser microphones, the well known Level Recorder, new Standing Wave Tubes, and the Tapping Machine which at a later time was standardized by ISO.

Dr. Bruel wrote over 100 articles, gave numerous lectures at international meetings and conferences, holds 18 patents on acoustic instrumentation and 2 on acoustic absorbers. He is an avid aviator who accumulated 8760 hours as pilot-in-command and held glider, single-engine, multi-engine up to 18,000 lbs, with instrument and aerobatic ratings.

Dr. Bruel has held several special appointments, including member of the Council to the Danish National Bank, Board of Appeal for the Danish Environment Tribunal and Vice President of the Federation Aeronautique in Paris. His many honors include Silver Medals from the Audio Engineering Society (USA), Acoustical Society of America (USA) and the Danish Design Guild; the Lord Raleigh Gold Medal (London); Member of the National Academy of Engineering (USA) and Tissander Diplome (Paris).

Based in Holte, Denmark, his current company Bruel Acoustics helps organizations solve acoustical problems, lending to enhanced communication potential and a more effective working climate.

The AES Technical Council and Board of Governors introduced the Richard C. Heyser Memorial Lecture in May 1999 to honor the memory of Richard Heyser, a former AES Governor and Silver Medal recipient. A scientist at the Jet Propulsion Laboratory, Mr. Heyser was awarded nine patents in audio and communication techniques and was widely known for his ability to clearly present new and complex technical ideas.

For more information on the 110th Convention, please visit the AES website at or telephone +32 2 345 7971.

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AES - Audio Engineering Society