Microphones and earphones for speech communications Ingestion-build-47786 slag or glass

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Who is this BS 8233 - Guidance on sound insulation and noise reduction for buildings for

BS EN 14531-1 on railway vehicle braking is useful for:

Microphones and earphones for speech communications Ingestion-build-47786 slag or glass1 Scope This standard applies to the microphone part and earphone part of handsets, headsets or earsets for speech communications, and also to the microphone units and earphone units of built in handsets, headsets or earsets. The object of this standard is to establish definitions relating to these electroacoustic transducers, and to standardize the characteristics to be specified and the relevant methods of measurement. This does not exclude the use