01152nam a22001097a 4500245019200000250000800192260006400200300001000264505072900274650002201003650001701025  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