A Monaural Comparison of Two Circumaural Earphones with a Standard Audiometric Earphone

摘要

A new procedure is described for determining the real-ear frequency response of an earphone when it is coupled to a human head. The air-conducted output of a standard and of a new earphone are successively adjusted to equal loudness with the constant reference loudness of a bone-conducted tone. Differences in voltages between the two earphones, at equal loudness, constitute a transfer function from the old to the new phone. The problem to the sujbect is a simple one of monaural loudness discrimination; the transfer function is determined with about twice the precision and in no more than one-fourth the time of the usual alternate interaural loudness balancing with 'ear-reversal' to allow for audiometric differences between the two ears. (Author)