Binaural MPEG Surround Decoding With HRTF Subband Synthesis

The patent creates a virtual copy of the multi-channel speaker system effect through binaural synthesis. Instead of physically implementing multiple speakers, the system synthesizes spatial audio cues that mimic what would be heard from a multi-channel system, delivering the spatial experience through standard stereo headphones or speakers.

The patent replaces the mechanical multi-channel speaker system with a signal processing-based binaural synthesis system. By substituting physical acoustic reproduction with computational audio processing (HRTF filtering and binaural synthesis), the system achieves spatial audio effects without requiring complex hardware configurations.

The patent segments the audio signal and HRTF data into subbands for processing. By dividing the frequency spectrum into multiple subbands and processing them separately, the system reduces the computational complexity of full-band convolution while maintaining spatial audio quality, making binaural synthesis feasible for mobile devices.

The patent applies partial action by selectively processing only the necessary frequency subbands rather than the entire spectrum. This approach reduces computational load while preserving the essential spatial cues needed for 3D audio perception, balancing quality and complexity.