Multi-Channel Acoustic Echo Cancellation for CPU-Limited Voice Commands

The patent segments the multi-channel acoustic echo cancellation process into multiple parallel filter banks, where each filter bank processes a specific frequency range or channel independently. This segmentation divides the computationally intensive task into smaller, more manageable units that can be processed in parallel, reducing the overall computational burden on the CPU while maintaining the signal-to-noise ratio enhancement.

The patent applies partial action by implementing acoustic echo cancellation only for specific frequency ranges or channels where it is most needed, rather than processing the entire audio spectrum uniformly. This selective approach reduces computational requirements while still achieving effective voice command enhancement in the critical frequency ranges.

The patent implements periodic action by processing audio signals in discrete frames or time windows, where acoustic echo cancellation is applied periodically rather than continuously in real-time. This approach allows the system to allocate computational resources in bursts, ensuring voice command recognition accuracy while providing opportunities for other system functions to execute between processing intervals.

The patent applies partial action by focusing computational resources only on the specific audio channels or frequency ranges containing voice commands, rather than processing all audio streams equally. This selective processing improves voice command recognition accuracy while minimizing the impact on system throughput for other functions.