K. Abe et al [6]. In their work, they developed a sound classification method based on timefrequency image processing. They classified sound in four different classes: “Speech”, “Noise”, “Speech in Noise” and “Classical Music”. The initial idea was to develop a system that could calibrate the hearing aids automatically according to the acoustic environmental changes. Their algorithm generates images from the sounds that are coming to hearing aids. According to the characteristics of the images, sound is classified into four classes. The authors state that the proposed method has a possibility to establish a sound classification in hearing aid system as the first and rough trial.