ISO 389-7. Acoustics - Reference zero for the calibration of audometric equipment. Part 7: Reference threshold of hearing under free-field and diffuse-field listeneing considitons
ISO 389-7. Acoustics - Reference zero for the calibration of audometric equipment. Part 7: Reference threshold of hearing under free-field and diffuse-field listeneing considitons Amendment 1: Reference thereshold of hearing at 20 Hz and 18 000 Hz under free-field listeneing conditions and at 20 Hz under diffuse-field listening conditions
- Geneva International Standards Association 2016