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IEC 60225:1966 ed1.0

Заменен
Octave, half-octave and third-octave band filters intended for the analysis of sounds and vibrations — 9 стр.
Applies to band filters commonly known as octave, half-octave and third-octave band filters of the passive or active type, the latter including amplifier elements.
ICS
17.140.50 Electroacoustics. Including sound level meters / Электроакустика. Включая слуховые аппараты и шумомеры