HATS<\/strong><\/span><\/a>) Type 5128 has been authorised by the ITU-T (International Telecommunication Union \u2013 Telecommunication Standardisation Sector) and ensures makers of products such as mobile phones, headsets (including ear buds that include a microphone) and in-vehicle infotainment systems that provide hands-free communication capabilities, that their goods are also in line with official standards.<\/p>\nThese tests \u2013 specified by regional, national, and global standards \u2013 are defined by organisations such as 3GPP, IEC and IEEE, and they all refer to P.58 for the authorised equipment to be used in the testing required before products are sold for use, and are typically performed both by vendors of communication devices and network providers.<\/p>\n
What makes Type 5128 unique is that it is the first and only device to accurately measure over the full human audio frequency range. All previous devices are based on an acoustic coupler design referred to as the \u2018type 711 coupler\u2019 (from the original standard IEC 711, now IEC 60318-4), which is only qualified for frequencies up to 8 kHz. With the advent of super-wideband and fullband standards, which define responses to 14 kHz and 20 kHz respectively, the market was struggling to be able to evaluate their products with the approved devices.<\/p>\n