KoREMA - Croatian Society for Communications, Computing, Electronics, Measurement and Control
Abstract
This paper describes the implementation of composed audio test signal (CATS) based test system for evaluation of electroacoustic performance of hearing aids. The system applies a frequency-shaped CATS sequence to a hearing aid as an acoustic stimulus and measures the acoustic response of the aid in IEC standard occluded-ear stimulator. The frequency response can then be found by taking the discrete Fourier Transform of the impulse response. This method has several advantages over traditional noise-based methods regard measurements in the absence or presence of the external interference noise.U članku je opisana primjena složenog audio test signala (CATS) pri određivanju elektroakustičkih svojstava slušnih pomagala. Test sustav primjenjuje frekvencijski ugođenu CATS sekvenciju kao akustičku pobudu za mjerenje akustičkog odziva slušnog pomagala u stimulatoru po IEC standardu. Frekvencijski odziv se dobiva iz impulsnog odziva pomoću diskretne Fourierove transformacije. Ta metoda (CATS) ima znatne prednosti spram uobičajene mjerne metode sa šumnim signalom, pri mjerenju u prisutnosti ili odsutnosti vanjskog interferirajućeg šuma
