US 11,889,267 B2Granted

Noise cancellation enabled audio system and method for adjusting a target transfer function of a noise cancellation enabled audio system

AssigneeAms AG

InventorsMartin Denda, Martin Schörkmaier, Philipp Hack, Siegfried Selberherr

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Abstract

A noise cancellation enabled audio system for tonal tinnitus treatment using ambient noise comprises an audio processor (PROC) and at least one filter having an adjustable filter function. An ear mountable playback device (HP) further comprises a speaker (SP) and at least one feedforward microphone (FF_MIC). The audio processor (PROC) is configured to receive an input signal (Z(s)) from the feedforward microphone (FF_MIC) indicative of ambient noise and determine a filter transfer function (HF(s)) to realize a predetermined target transfer function (HT(s)), wherein the target transfer function (HT(s)) is configured to attenuate and/or amplify the input signal (Z(s)) in a predetermined frequency range. The filter function is adjusted depending on the filter transfer function (HF(s). The filter is configured to provide a system output signal (Y(s)) by filtering the input signal (Z(s)) depending on the filter function.

Claims11

Dependent claims

A noise cancellation enabled audio system for tonal tinnitus treatment using ambient noise, comprising:

an audio processor,
at least one filter having an adjustable filter function,
an ear mountable playback device further comprising a speaker and at least one feedforward microphone, and
an amplifier coupled between the audio processor and the speaker,
wherein the audio processor is configured to:
receive an input signal from the feedforward microphone indicative of ambient noise,
determine a filter transfer function to realize a predetermined target transfer function, wherein the target transfer function is configured to attenuate and/or amplify the input signal in a predetermined frequency range, and
adjusting the filter function depending on the filter transfer function;
and
wherein the filter is configured to:
provide a system output signal by filtering the input signal depending on the filter function, and,
wherein:
the audio processor is provided with acoustic transfer functions between an ambient sound source creating the ambient noise and an eardrum exposed to the speaker, and
the audio processor is configured to determine the filter transfer function by compensating for the acoustic transfer functions, and
wherein the acoustic transfer functions comprise:
a first acoustic transfer function of the feedforward microphone, denoted HM(s),
a second acoustic transfer function of the amplifier, denoted HA(s),
a third acoustic transfer function of the speaker, denoted HS(s),
a fourth acoustic transfer function of the ear mountable playback device, denoted HH(s);
and wherein:
the filter transfer function, denoted HF(s), is determined as
H
F
(
s
)
=
H
T
(
s
)
-
H
H
(
s
)
H
M
(
s
)
·
H
A
(
s
)
·
H
S
(
s
)
wherein HT(s) denotes the target transfer function.

53 more elements

A method for adjusting a target transfer function of a noise cancellation enabled audio system comprising an audio processor and an ear mountable playback device further comprising a speaker and at least one feedforward microphone, the method comprising:

receiving using the feedforward microphone an input signal from a feedforward microphone, the input signal being indicative of ambient noise, and, using the audio processor:
determining a filter transfer function to realize a predetermined target transfer function, wherein the target transfer function is configured to attenuate and/or amplify the input signal in a predetermined frequency range,
adjusting a filter function of at least one filter of the noise cancellation enabled audio system depending on the filter transfer function,
providing acoustic transfer functions between an ambient sound source creating the ambient noise and an eardrum exposed to the speaker, and
determining the filter transfer function by compensating for the acoustic transfer functions, and
wherein the acoustic transfer functions comprise:
a first acoustic transfer function of the feedforward microphone, denoted H_M(s),
a second acoustic transfer function of an amplifier, denoted H_A(s),
a third acoustic transfer function of the speaker, denoted H_S(s),
a fourth acoustic transfer function of the ear mountable playback device, denoted H_H(s);
and wherein:
the filter transfer function, denoted H_F(s), is determined as
H
F
(
s
)
=
H
T
(
s
)
-
H
H
(
s
)
H
M
(
s
)
·
H
A
(
s
)
·
H
S
(
s
)
wherein H_T(s) denotes the target transfer function.

44 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/424,589Filed 23 Jan 2020
Priority: EP 1915379425 Jan 2019
Published: US 2022/0086574 A117 Mar 2022
Granted: 30 Jan 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04R 25/505
Customised settings for obtaining desired overall acoustical characteristics: using digital signal processing
H04R 1/1083
Earpieces; Attachments therefor ; Earphones; Monophonic headphones: reduction of ambient noise
H04R 25/353
Using translation techniques: frequency, e.g. frequency shift or compression
H04R 25/558
Using an external connection, either wireless or wired: remote control, e.g. of amplification, frequency