Multi-Overlap Window Sequencing for Low-Delay Audio Coding

The patent segments the window sequence into multiple distinct window types (first window, second window, third window) with different overlap characteristics. This segmentation allows the system to select appropriate window segments based on transient detection, providing fine-grained adaptability to different signal conditions without requiring a completely complex system redesign.

The patent implements dynamic window sequence selection that adapts to detected transients. The system transitions from static binary overlap choices to dynamic multi-window sequencing based on transient location detection. This dynamic adaptation allows the overlap width to be adjusted in real-time according to signal characteristics, resolving the contradiction between simplicity and adaptability.

The patent implements dynamic transform length selection that switches between long transforms (for stationary signals) and short transforms (for transient regions). This dynamic adaptation allows the system to maintain long overlap for coding efficiency during stationary periods while reducing overlap and look-ahead delay when transients are detected, thus resolving the time-efficiency contradiction.

The patent applies different transform lengths and overlap widths locally according to signal characteristics. Instead of using a uniform transform length throughout the signal, the system identifies transient regions and applies short transforms locally in those regions while maintaining long transforms in stationary regions. This local adaptation optimizes both coding efficiency and transient handling without requiring global parameter changes.

The patent segments the signal processing into distinct transform types (long and short) that can be selectively applied. This segmentation allows the system to use short transforms only in specific transient regions where they are most beneficial, rather than applying them globally. The structured segmentation of transform types simplifies the switching logic compared to arbitrary transform length changes.

The patent changes the transform length parameter adaptively based on detected transient locations. By systematically varying this key parameter (transform length) in response to signal characteristics, the system reduces pre-echo noise in transient regions while maintaining coding efficiency in stationary regions. The parameter change is driven by objective transient detection rather than subjective decision-making, reducing switching overhead.