US 12,354,581 B2
Method for automatically designing a feedforward filter
Fotios Kontomichos, Patras (GR); and Wessel Harm Lubberhuizen, Hengelo (NL)
Assigned to Renesas Design Netherlands B.V., 's-Hertogenbosch (NL)
Filed by Dialog Semiconductor B.V., 's-Hertogenbosch (NL)
Filed on Aug. 31, 2022, as Appl. No. 17/900,236.
Prior Publication US 2024/0071350 A1, Feb. 29, 2024
Int. Cl. G10K 11/16 (2006.01); H04R 1/10 (2006.01)
CPC G10K 11/16 (2013.01) [H04R 1/1083 (2013.01); G10K 2210/3027 (2013.01)] 17 Claims
OG exemplary drawing
 
14. A computer system comprising a module configured as an automatic feedforward filter design tool for designing a feedforward filter of an audio device, the audio device comprising the feedforward filter and a feedback filter, the tool being configured to optimize the feedforward filter for an audio transparency mode of operation wherein, optimization of the feedforward filter is dependent on the feedback filter;
wherein:
optimizing the feedforward filter comprises determining one or more properties of the feedforward filter, the one or more properties of the feedforward filter comprising a feedforward filter transfer function;
a property of the feedback filter comprises a feedback filter transfer function, and the determination of the feedforward filter transfer function is dependent on the feedback filter transfer function;
the audio device comprises:
i) a speaker driver;
ii) a feedforward path comprising the feedforward filter and a feedforward microphone;
iii) a feedback path comprising the feedback filter and a feedback microphone; and
iv) a first transfer function, the first transfer function being a passive frequency response of the audio device on a listener's ear; and
the feedforward filter transfer function is designed to compensate for the first transfer function, thereby optimizing the feedforward filter for the audio transparency mode of operation.