Masking level difference adaptor for audiometers

Details Masking level difference adaptor for audiometers Masking level difference adaptor for audiometers

1978-10-05

1980-09-23

Morrison, Malcolm A.

A61B 512

Patent

active

042244684

ABSTRACT:
An adaptor is disclosed for use with audiometers to enable the measurement of the masking level difference (MLD) in a person's hearing capability. The adaptor comprises a signal channel and a noise (masker) channel which are connected respectively with the audiometer outputs and the earphones. Means are provided to apply the signal voltage and the noise voltage to respective mixers in the two channels and for selectively inverting the phase of the signal voltage at one of the mixers and for selectively inverting the phase of noise voltage at one of the misers. Various MLD test conditions can be established including binaural and monaural conditions and adjustable intensity at one ear.

REFERENCES:
patent: 2875278 (1959-02-01), Lueders
patent: 3784750 (1974-01-01), Stearns et al.
patent: 3809811 (1974-05-01), Delisle et al.
patent: 3959735 (1976-05-01), Grosjean
patent: 4112377 (1978-09-01), Tanner et al.
Olsen et al., "Masking Level Differences," Audiology, vol. 15, pp. 287-301, 1976.

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