公开(公告)号：US11206004B1

公开(公告)日：2021-12-21

申请号：US17023340

申请日：2020-09-16

Applicant: Apple Inc.

Inventor： Navneet Gandhi

IPC: H04R1/10 ,  H04R3/00 ,  G10K11/16 ,  H03G5/16 ,  G10K11/178

Abstract: Automatic equalization for consistent headphone may take place in a playback mode of operation in which ANC is turned off and there is no direct feedback from an internal microphone (to the input of a speaker). An automatic user content equalization process is active during that mode of operation which adapts a filter AEQ to restore a flat or other desired frequency response at the output of the speaker despite variation in headphone fit. An estimate of a transfer function of a path S is determined, wherein the path S is from i) the input of the speaker of the headphone to the internal microphone signal. The filter AEQ is adapted based on the estimate of the transfer function of the path S while it filters user content audio that drives the input of the speaker of the headphone. Other embodiments are also described and claimed.

公开(公告)号：US11250833B1

公开(公告)日：2022-02-15

申请号：US17023278

申请日：2020-09-16

Applicant: Apple Inc.

Inventor： Vladan Bajic ,  Hanchi Chen ,  Vasu Iyengar ,  Yang Lu ,  Navneet Gandhi ,  Thomas M. Jensen

IPC: G10K11/178 ,  H04R1/10

Abstract: A method performed by an audio system that includes a headset with a left headset housing and a right headset housing. The method includes driving a speaker of the left headset housing with an audio signal, determining whether audio howl is present within the left headset housing by comparing spectral content from a first error microphone signal produced by a first error microphone of the left headset housing and spectral content from a second error microphone signal produced by a second error microphone of the right headset housing, and, in response to determining that audio howl is present, filtering the audio signal to mitigate the audio howl.

公开(公告)号：US11688383B2

公开(公告)日：2023-06-27

申请号：US17460041

申请日：2021-08-27

Applicant: Apple Inc.

Inventor： Navneet Gandhi ,  Daniel S. Phillips ,  Jarrett B. Lagler

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/17854 ,  G10K11/17821 ,  G10K11/17881 ,  H04R1/1016 ,  H04R1/1083 ,  G10K2210/1081 ,  H04R2460/01

Abstract: A processor is configured to perform headphone playback with a playback audio signal. The processor produces a feedback signal from an internal microphone, compresses the feedback signal according to a variable compressor setting, and determines a context of usage of the headphone, as being one of running or jogging, transportation, and critical listening. In response, the processor changes the variable compressor setting and drives the headphone speaker with the compressed feedback signal combined with the playback audio signal. Other aspects are also described and claimed.

公开(公告)号：US20230060353A1

公开(公告)日：2023-03-02

申请号：US17460041

申请日：2021-08-27

Applicant: Apple Inc.

Inventor： Navneet Gandhi ,  Daniel S. Phillips ,  Jarrett B. Lagler

IPC: G10K11/178 ,  H04R1/10

Abstract: A processor is configured to perform headphone playback with a playback audio signal. The processor produces a feedback signal from an internal microphone, compresses the feedback signal according to a variable compressor setting, and determines a context of usage of the headphone, as being one of running or jogging, transportation, and critical listening. In response, the processor changes the variable compressor setting and drives the headphone speaker with the compressed feedback signal combined with the playback audio signal. Other aspects are also described and claimed.

公开(公告)号：US11355096B1

公开(公告)日：2022-06-07

申请号：US17023314

申请日：2020-09-16

Applicant: Apple Inc.

Inventor： Navneet Gandhi

IPC: G10K11/178

Abstract: An internal microphone signal of a headphone is filtered by i) a first filter G that, as part of an acoustic noise cancellation, ANC, subsystem, produces an anti-noise audio signal, and ii) a second filter C to produce a feedback audio signal. An estimate of a transfer function of a path S is determined, wherein the path S is from i) an input of a speaker of the headphone to ii) the internal microphone signal. The second filter C is adapted based on the estimate of the transfer function of the path S drives an input of a speaker of the headphone. Other embodiments are also described.