Patent ID: 11942069
Assignee: RENESAS DESIGN NETHERLANDS B.V.
Field: Other consumer goods (Other fields)
Classification: CPC G | IPC G

Claim 7:
8. The method of claim 1, wherein, defining the target transfer function comprises:
i) modelling an active noise cancelling headset comprising:
a first signal path from an ambient noise source to a user's ear;

a second signal path from the ambient noise source to a feedforward microphone;
a third signal path from the feedforward microphone to a speaker driver; and
a fourth signal path from the speaker driver to the user's ear;
ii) determining a transfer function of each of the first, second and fourth signal paths, wherein the transfer function of a signal path represents a gain and a phase change of the signal path;
iii) defining the target transfer function as the negative of the transfer function of the first signal path, divided by the dot product of the transfer function of the second and fourth signal paths.