Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Patent
1994-08-02
1997-05-06
Lee, Michael H.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Plural or compound reproducers
381189, 181129, 181130, H04R 2500
Patent
active
056279027
ABSTRACT:
A headset is provided for an audio and video system that is compatible with the strong magnetic fields generated by Magnetic Resonance Imaging equipment. In the system, the audio portion of the signal is passed through an amplifier and appropriate RF filters and chokes, and fed into a pneumatic transducer inside the magnet room. A headset having an inner set (portion) connects the output of the pneumatic transducer to the patient's ear, while an outer set covers the patient's ear to block out gradient knocking noises.
REFERENCES:
patent: Re34219 (1993-04-01), Lederer
patent: 3810525 (1974-05-01), Crenna
patent: 4170275 (1979-10-01), Larsen
patent: 4347911 (1982-09-01), Bertagna et al.
patent: 4542803 (1985-09-01), Houng
patent: 4588868 (1986-05-01), Bertagna et al.
patent: 5076275 (1991-12-01), Bechor et al.
patent: 5277184 (1994-01-01), Messana
Cover page, selected pages of General Electric parts list and Operator Intercom Assembly diagram (oversize copy), dated 1986.
AMP Incorporated RF Filter specification, dated Apr. 19, 1987.
"Simple Music/Audio System for Patients Having MR Imaging," written by Alan T. Miyamoto and R. Tim Kasson of Glendale Adventist Medical Center, Nov. 1988 edition of the American Journal of Roentgenology.
Copy of Oct. 5, 1994 jury verdict form in Magnacoustics, Inc., Vs. Resonance Technology Co., Mokhtar Ziarati and Susana Ziarati, holding invalid claims 6, 9 and 12 of U.S. Pat. No. 34,219 to Lederer in view of the above prior art and applicant's prior sale activities.
Lee Michael H.
Resonance Technology, Inc.
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