Patent ID: 8207439

Claim:
A musical tone signal processing apparatus, the apparatus comprising: input means for inputting a musical tone signal, the musical tone signal comprising a signal for each of a plurality of input channels; dividing means for dividing the signal into a plurality of frequency bands; level calculation means for calculating a level for each of the input channels based on the frequency bands; localization information calculation means for calculating localization information, which indicates an output direction of the musical tone signal with respect to a reference point that has been set in advance, for each of the frequency bands based on the level; setting means for setting a direction range; judgment means for judging whether the output direction of the musical tone signal is within the direction range; extraction means for extracting an extraction signal, the extraction signal comprising the signal of each of the input channels in the frequency band corresponding to the localization information having the output direction that is judged to be within the direction range; signal processing means for processing the extraction signal into a post-processed extraction signal for each of the direction ranges; synthesis means for synthesizing each of the post-processed extraction signals into a synthesized signal for each output channel that has been set in advance for each of the direction ranges, each output channel corresponding to one of the plurality of input channels; conversion means for converting each of the synthesized signals into a time domain signal; and output means for outputting the time domain signal to each of the output channels.