one-third-octave band meaning in English

一三八波带

Verification regulation of octave - band and one - third - octave band filters
倍频程和1 3倍频程滤波器检定规程
Electroacoustics - instruments for measurement of aircraft noise - performance requirements for systems to measure one - third - octave band sound pressure levels in noise certification of transport - category aircraft
电声学.航空噪声测量.运输机噪声检定测量三分之一带宽倍频声压级装置性能要求
Electroacoustics - instruments for measurement of aircraft noise - performance requirements for systems to measure one - third - octave band sound pressure levels in noise certification of transport - category aeroplanes
电声学.航空噪声测量仪器.在运输机噪声鉴定中测量三分之一带宽倍频声压级装置的性能要求