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special purpose average (SPA)

The test procedures for hearing aids are explained in DINIEC 60118. In addition to the average value for the sound pressure or gain, the High Frequency Average

(HFA), there is also the special average value. These two values differ in that the three frequencies are specified

inthe standard

for the HFA value, whereas they are specified by the manufacturer for the special purpose average (SPA). In addition to the characteristic value for the specialpurpose

average, there is also an average value for high frequencies, the high frequency average (HFA).

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Englisch: special purpose average - SPA
Updated at: 19.04.2016
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