ANSI/ASA S3.42-1992 (R2012)

Vendor Note: This standard describes techniques for characterizing the steady-state performance of hearing aids with a broad-band noisesignal. The need for such a standard arises from the importance of assessing the performance of hearing aids in environmentsmore nearly representing their real-world use. The noise test signal specified herein has been employed by the National Bureauof Standards for over 20 years in testing hearing aids. Among the tests described are noise saturation sound pressure level,noise gain, frequency response, family of frequency response curves and output versus input characteristic. Additionally, theappendix recommends use of the coherence function to indicate the validity of frequency response measures and distinguishesbetween use of random and pseudo-random noise and asynchronous versus synchronous analysis.