Multiband compressor

Abstract

In a multiband compressor 100, a level calculation unit 121 calculates a signal level inputted for each of bands, a gain calculation unit 122 calculates a gain value from the calculated signal level, and a gain limitation unit 130 limits a gain value by comparison with a gain value of the other band in a compressor for each band. With this configuration, provided is a multiband compressor capable of achieving a balance between the quality of sound and the effect of enhancing the sound level at a high level.

1 . A multiband compressor that splits an audio signal by plural frequency bands, subjects the audio signal to a dynamics compression process for each of the frequency bands, synthesizes the subjected audio signal, and outputs the synthesized audio signal, comprising
 a level calculation unit that calculates a signal level inputted for each of the bands;   a gain calculation unit that calculates a gain value from the calculated signal level; and   a gain limitation unit that limits the gain value by comparison with a gain value of the other band in a compressor of each of the bands,   wherein the gain limitation unit selects the minimum gain value from among the gain value of the band to be processed and the gain value of a nearby band.   
     
     
         2 . A multiband compressor that splits an audio signal by plural frequency bands, subjects the audio signal to a dynamics compression process for each of the frequency bands, synthesizes the subjected audio signal, and outputs the synthesized audio signal, comprising
 a level calculation unit that calculates a signal level inputted for each of the bands;   a gain calculation unit that calculates a gain value from the calculated signal level; and   a gain limitation unit that limits the gain value by comparison with a gain value of the other band in a compressor of each of the bands,   wherein the gain limitation unit limits the gain value on a high frequency band side in such a manner that the gain value on the high frequency band side is less than or equal to the gain value on a lower frequency band side.   
     
     
         3 . The multiband compressor according  claim 1 , wherein the gain limitation unit multiplies a difference in the gain values between the band to be processed and a nearby band by a weight coefficient, obtain a sum total thereof, and adds the sum total to the gain value of the band to be processed. 
     
     
         4 . The multiband compressor according to  claim 1 , wherein the gain limitation unit limits the gain value on a high frequency band side in such a manner that the gain value on the high frequency band side is less than or equal to the gain value on a lower frequency band side. 
     
     
         5 . A multiband compressor that splits an audio signal by plural frequency bands, subjects the audio signal to a dynamics compression process for each of the frequency bands, synthesizes the subjected audio signal, and outputs the synthesized audio signal, comprising
 a level calculation unit that calculates a signal level inputted for each of the bands;   a gain calculation unit that calculates a gain value from the calculated signal level; and   a gain limitation unit that limits the gain value by comparison with a gain value of the other band in a compressor of each of the bands,   wherein the gain limitation unit limits the gain value to a lower frequency band,   wherein the gain limitation unit limits the gain value to a higher frequency band, and   wherein the gain limitation unit limits the gain value of a middle frequency band as a function of the limitation applied to a lower frequency band.