The record first. On August 16, 2022, Synaptics Incorporated was granted US11418878B1, "Secondary path identification for active noise cancelling systems and methods" (CPC H04R 3/02 and H04R 1/1016). Named inventors include Wensen Liu and Govind Kannan. The method identifies the secondary acoustic path — the route from the cancelling speaker back to the error mic — which must be characterized for ANC to work robustly.
Follow the merchant-silicon model. Most consumer-audio brands buy their ANC capability as a chip-plus-firmware bundle from a merchant supplier rather than developing it. That model only works if the supplier owns the hard algorithmic IP — path identification, adaptation, stability — and ships it as a turnkey block. A secondary-path grant is the supplier fencing exactly that turnkey value.
The business framing is who captures the ANC margin. When a no-name earbud advertises "active noise cancelling," the capability and its margin often sit with the silicon supplier, not the brand. Owning the calibration IP lets the supplier sell a higher-value block and resist being commoditized into a bare DSP. That stickiness is the revenue-durability story.
Comparability discipline applies. "ANC" spans the brands that build their own (a few) and the many that license it. The filing pins this claim to a foundational calibration step that turnkey suppliers must own — useful for distinguishing the suppliers that enable ANC at scale from the brands that merely badge it.
What the document does not disclose is the economics. It is a method claim, not a content figure. It will not tell you design wins, ASPs, or share. The grant establishes a turnkey-enabling position; the revenue is undisclosed.
For investors, the throughline is this: most consumer ANC is merchant silicon wearing a brand, and the patent record shows which suppliers own the turnkey capability the brands rely on.