Consistency of Electroacoustic Characteristics Across Components of FM Systems In the absence of national or international electroacoustic standards for the evaluation of Frequency Modulated (FM) amplification systems, it becomes important to know the variability one may expect across similar models. Evaluation of thirty FM systems of the same model obtained from three different educational sites was performed to determine ... Research Article
Research Article  |   June 01, 1991
Consistency of Electroacoustic Characteristics Across Components of FM Systems
 
Author Affiliations & Notes
  • Linda M. Thibodeau
    University of Texas at Austin
  • Kathryn A. Saucedo
    University of Texas at Austin
  • Requests for reprints should be sent to Linda M. Thibodeau, PhD, Department of Speech Communication, University of Texas at Austin, Jesse H. Jones Communication Center, Austin, TX 787121089.
  • Currently affiliated with Methodist Hospital/Baylor College of Medicine
    Currently affiliated with Methodist Hospital/Baylor College of Medicine×
Article Information
Hearing / Research Articles
Research Article   |   June 01, 1991
Consistency of Electroacoustic Characteristics Across Components of FM Systems
Journal of Speech, Language, and Hearing Research, June 1991, Vol. 34, 628-635. doi:10.1044/jshr.3403.628
History: Received March 5, 1990 , Accepted June 12, 1990
 
Journal of Speech, Language, and Hearing Research, June 1991, Vol. 34, 628-635. doi:10.1044/jshr.3403.628
History: Received March 5, 1990; Accepted June 12, 1990

In the absence of national or international electroacoustic standards for the evaluation of Frequency Modulated (FM) amplification systems, it becomes important to know the variability one may expect across similar models. Evaluation of thirty FM systems of the same model obtained from three different educational sites was performed to determine the variability that may occur as a result of the receiver, lapel microphone, or neckloop. There was a range as great as 20 dB in high frequency average saturation sound pressure level and equivalent input noise across receivers, lapel microphones, and neckloops. These results highlight the need for regular electroacoustic monitoring of not only the FM transmitter and receiver, but also the individual components, such as the lapel microphone and the neckloop.

Acknowledgments
The authors gratefully acknowledge the audiologists, Jacalyn Breslford, Samye May, and Karen Wright, for providing the FM systems and the electroacoustic evaluation equipment. Mary Roberts and Fred Martin contributed helpful comments on previous versions of this manuscript.
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