It is known that many real signals, such as speech are non-stationary processes express theirfeature through changes in parameters over time. By observing shorter time intervals, the property ofstationarity can be notice. This characteristic enables application of techniques for adaptation to local signalcharacteristics signal processing algorithms. Many these algorithms described by standards,...

Education is very important in the growth of children, including children with special needs such as people visual impairments. Not only at school can also develop their potential learning anywhere and anytime. One most processes reading writing. People impairments carry out writing activities using Braille. The problem lack family knowledge about braille, so accompanying blind cannot be conduc...