01300nam a22001457a 4500999001700000245019200017250000800209260006400217300001000281505072900291650002201020650001701042942000701059952008801066  c16221d16221  aIEC 60318-5:2006-Electroacoustics - Simulators of human head and ear - Part 5: b2 cm3 coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts  a1.0  aGeneva :bInternational Electrotechnical Commission,c2006.  a27 p.  aDescribes an acoustic coupler for loading an earphone or hearing aid with a specified acoustic impedance when determining its physical performance characteristics, in the frequency range 125 Hz to 8 kHz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e.g. ear moulds or similar devices. The sound pressure developed by an earphone is not, in general, the same in the coupler as in a person's ear. However, it can be used as a simple and ready means for the exchange of specifications and of physical data on hearing aids and for the calibration of specified insert earphones used in audiometry. This first edition of IEC 60318-5 cancels and replaces IEC 60126:1973.
  aElectroacoustics   aHearing aids  cST  00104070aAIISHbAIISHd2020-06-22l0pST007r2020-06-22 00:00:00w2020-06-22yST