NOISE SIGNAL ANALYZER, NOISE SIGNAL SYNTHESIZER, NOISE SIGNAL ANALYZING METHOD, AND NOISE SIGNAL SYNTHESIZING METHOD

摘要

An FFT section (102) converts a windowed input noise signal to a frequency spectrum. A spectrum model storage section (103) holds model information concerning a spectrum model. A spectrum model sequence calculating section (104) calculates a spectrum model number sequence corresponding to the amplitude spectrum sequence of the input noise signal by using model information stored in the spectrum model storage section (103). A continuation length model/transition probability calculating section (105) outputs a model parameter by using a spectrum model number sequence calculated by the spectrum model sequence calculating section (104). Thus, a background noise signal with high auditory quality is synthesized.