The historical filing leaders in this dataset include Nokia, Philips, Microsoft, MH Acoustics, Qualcomm and Harman Becker, based on assignee volume across the corpus. Notably, all six show zero filings in the most recent year tracked, which suggests their core patent positions were built out earlier rather than being actively expanded now. Newer or smaller entrants may be filing at a steadier pace, but the largest historical volume sits with these incumbents.

Not on the evidence here. Filings peaked at 208 in 2019, and the 2022 midpoint already shows a lower count of 139, indicating a flat-to-declining trend rather than continued growth. Publication lag of roughly 18 months means the most recent one to two years are undercounted in any trend chart, so the true recent-year total is somewhat higher than reported, but the multi-year direction before that lag window is clearly downward from the 2019 peak.

H04R covers loudspeakers, microphones and other audio transducers — the physical hardware side of a microphone array — and accounts for 1,756 records in this corpus. G10L covers speech and audio analysis and synthesis, the algorithmic side including noise suppression and direction-of-arrival processing, with 1,031 records. A single patent family can and often does touch both classes when it claims an array alongside its processing pipeline.

Filing density is comparatively thin in multi-modal audio-visual direction of arrival, automotive cabin far-field pickup, video-conferencing signal selection gating, acoustic source tracking under occlusion, and positioning-integrated array calibration. These sit adjacent to the dense core of beamforming and echo-cancellation claims rather than replacing them, and each pulls in classes outside the main H04R/G10L pairing, such as G01S positioning or H04N video. A first claim in these areas would typically need to combine an array or transducer element with a specific downstream use case rather than claiming the acoustic method alone.

This Biamp Systems filing, published January 2024, claims a conferencing device that runs beamforming, echo cancellation and post-processing as a single pipeline, then gates signal selection based on far-end activity. It is a useful marker of how recent claims bundle previously separate functions — array steering, echo removal and transmission selection — into one integrated system claim. Companies designing conferencing hardware should check whether their own pipeline architecture overlaps with this specific sequencing and gating logic, rather than assuming standalone beamforming or echo-cancellation claims are the only risk.