Filter Generation Device for Out-of-Head Localization

The patent applies parameter changes by modifying the frequency characteristics parameters through smoothing processing. The system detects peaks and dips in the measured frequency characteristics and applies smoothing to reduce their magnitude, transforming the parameter values to eliminate signal clipping while preserving the essential spatial acoustic transfer characteristics for out-of-head localization

The patent converts the harmful effect of steep peaks and dips (which cause signal clipping) into a benefit by using smoothing processing to reshape the frequency characteristics. The harmful variability in measured characteristics is transformed into a controlled, clipped-free signal that still maintains the individualized spatial acoustic transfer characteristics needed for accurate out-of-head localization

The patent implements universality by creating a measurement and processing system that works across multiple playback devices (headphones, speakers, earphones). The system measures frequency characteristics for each device and applies appropriate smoothing, making the out-of-head localization function universally applicable to various playback devices without requiring device-specific hardware modifications

The patent applies preliminary action by performing frequency characteristic measurement and smoothing processing in advance before actual out-of-head localization reproduction. The system pre-processes the spatial acoustic transfer characteristics for each playback device, storing the smoothed characteristics for later use, so that when the user switches devices, the appropriate pre-processed characteristics are already available