| 摘要 |
<P>PROBLEM TO BE SOLVED: To correct audio signals so as not to generate distorted sound corresponding to a sound volume when a signal level of the audio signals is high. <P>SOLUTION: A dynamic frequency correction device 3 includes: first correction value calculation means for calculating a first correction value (control signal C) in an inverse proportion to the signal level of band-based signals (output 1-output n) divided into respective bands by band division means 7-1 to 7-n; entire band correction value calculation means for calculating a correction value (offset signal) of the entire band in inverse proportion to the signal level of entire band signals (output n+1); second correction value calculation means for calculating a second correction value by adding the correction value of the entire band to the first correction value; weighting means for weighting the band-based signals by multiplying the second correction value with the band-based signals for each band; composition means for combining the weighted band-based signals for each band; and second correction value change means for changing the second correction value to be equal to or smaller than a prescribed upper limit value. <P>COPYRIGHT: (C)2012,JPO&INPIT |
