Experimental wide-band hearing aid
Mead C. Killion · The Journal of the Acoustical Society of America · 1976
A simple bridged-T equalization network and the “6-kHz earmold” described elsewhere have been used in conjunction with recently introduced wide-band transducers to construct an experimental behind-the-ear hearing aid with extended bandwidth. The resulting frequency response is smooth and (after correcting for head and ear-diffraction effects) approximately uniform up 1500 Hz, with a 10-dB boost in the 2–6-kHz region. A comparison of the frequency responses obtained on the 2-cc coupler, on “KEMAR”, and by subjective tests,indicates good agreement with previous head and ear-diffraction studies. [Work supported by Industrial Research Products, Inc., Elk Grove Village, IL and Central Institute for the Deaf, St. Louis, MO.]