how to synthesize sound the sound image localization information is not a multi-channel signal and apparatus are disclosed . Sound field reproduction apparatus synthesis signal classifying unit for classifying multi-channel signals to a main signal (Primary Signal) and the additional signal (Ambient Signal); The sound localization and sound localization information of the main signal information for estimating the sound localization information of said additional signal estimator ; And the main signal and said additional information signal in the sound localization of sound localization information and environment information to the listener based on the main signal and the addition may include a rendering for rendering the signal .
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