Details

Autor(en) / Beteiligte

• Egolf, D P
• Haley, B T
• Bauer, K M
• Howell, H C
• Larson, V D

Titel

Experimental determination of cascade parameters of a hearing-aid microphone via the two-load method

Ist Teil von

• The Journal of the Acoustical Society of America, 1988-06, Vol.83 (6), p.2439-2446

Ort / Verlag

United States

Erscheinungsjahr

1988

Quelle

MEDLINE

Beschreibungen/Notizen

• Presented in this article is a computer-aided experimental method for obtaining the cascade parameters of the two-port model of a miniature hearing-aid microphone. The method is an adaptation of the "two-load" method [D.P. Egolf and R.G. Leonard, J. Acoust. Soc. Am. 62, 1013-1023 (1977)] to acoustoelectric, rather than electroacoustic, transducers. The cascade parameters of a particular microphone, determined by this method, were within 2.5 dB of the manufacturer's published open-circuit sensitivity data. In an attempt to further verify the numerical cascade-parameter data, a two-port model of the microphone was used to simulate experimental voltages developed across two different complex electrical load impedances attached to the microphone. The results showed experimental/simulation differences of no greater than 3.0 dB at any frequency. The two-port microphone model and associated cascade parameters are currently being incorporated into a computer-based plan for mathematical simulation of an entire in situ hearing aid.