| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain acceleration of a reaction speed by suppressing or intensifying an input signal in accordance with a change in the character of the relevant signal. <P>SOLUTION: The input signal is converted into a discrete frequency domain signal x(ωn) for each frame and divided into a plurality of groups so as to include one or more signals, an average root AX of total power sums of input signals within the frame is determined, an amplitude average AHm of signals within the group is determined for each group, and magnitudes of a first target amplitude TX and AX are compared. If AX is greater, a first standardized average value AHm×TX/AX is determined and the magnitude of the standardized average value is compared with that of amplitudes ¾x(ωn)¾ of signals in that group. If ¾x(ωn)¾ is greater, a first compression function is applied to that amplitude and the signal is output after the amplitude is suppressed to become closer to TX. If ¾x(ωn)¾ is not greater, the signal is output while keeping its amplitude as it is, and the entire output signal is converted into a time domain signal. <P>COPYRIGHT: (C)2007,JPO&INPIT |
