Patent ID: 6999828

Claim:
A portable audio device having a signal processing device for performing digital audio decoding comprising: a distribution section which divides a first digital signal framed for each predetermined time interval to (N×t+i)th frame signals (i and t are integers, N is a natural number greater than 1, and 0≦i<N) and distributes said frame signals for each frame interval one after another; first to Nth sub signal processing sections each of which is given said frame signals from said distributing section, and each of which completes a first process within a period (N×T) (T is a real number); a selection section which selects one of a processed signal outputted from said first to Nth sub signal processing sections for each frame interval one after another; and a main signal processing section which converts a signal inputted from said selection section into a second digital signal by completing a second process within a period T; wherein said first digital signal is a compressed and encoded signal of an audio signal; said second digital signal is a PCM signal of an audio signal; said first process contains a process picking out information from the compressed and encoded signal to convert the information into information of a frequency spectrum; and said second process contains a process converting said information of said frequency spectrum into said PCM signal having a time basis.