IP Library › Granted Patent US 12,267,654
Granted Patent B2
US 12,267,654 · App. 18/307,713 · Granted Apr 1, 2025

Index scheming for filter parameters

Inventors: Remi Samuel Audfray (San Francisco, CA); Jean-Marc Jot (Aptos, CA); Samuel Charles Dicker (San Francisco, CA)
Assignee: Magic Leap, Inc.
H04R3/04H04R29/001H04R2430/01
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Quick Facts
Patent No.
US 12,267,654
App. No.
18/307,713
Filed
Apr 26, 2023
Granted
Apr 1, 2025
Kind
B2
Examiner
TRAN, CON P
Art Unit
2695
USPC
381/57
Abstract

A method of processing an audio signal is disclosed. According to embodiments of the method, magnitude response information of a prototype filter is determined. The magnitude response information includes a plurality of gain values, at least one of which includes a first gain corresponding to a first frequency. The magnitude response information of the prototype filter is stored. The magnitude response information of the prototype filter at the first frequency is retrieved. Gains are computed for a plurality of control frequencies based on the retrieved magnitude response information of the prototype filter at the first frequency, and the computed gains are applied to the audio signal.

Claims (89)

1. A method comprising:

determining magnitude response information for a filter, the magnitude response information comprising a plurality of gain values, at least one of the plurality of gain values including a first gain corresponding to a first frequency;

at a first time, storing the magnitude response information for the filter;

determining one or more properties of an environment of a wearable head device;

determining a target magnitude response based on the one or more properties of the environment, the target magnitude response comprising one or more control frequencies and further comprising a target gain corresponding to a control frequency of the one or more control frequencies;

at a second time later than the first time, retrieving the magnitude response information for the filter;

determining an audio signal based on a selected portion of the magnitude response information, wherein the selected portion is selected based on the target gain; and

presenting the audio signal to a user of the wearable head device.

2. The method of claim 1 , further comprising:

presenting a test signal via the one or more speakers of the wearable head device;

detecting a response signal via one or more sensors of the wearable head device; and

determining a relationship between the test signal and the response signal, wherein the audio signal is determined based on the relationship.

3. The method of claim 1 , further comprising:

determining a magnitude response information of a high-shelving equalizer,

scaling the magnitude response information of the high-shelving equalizer, and

shifting the scaled magnitude response information of the high-shelving equalizer along a frequency axis by a predetermined frequency amount.

4. The method of claim 1 , further comprising:

determining a magnitude response information of a low-shelving equalizer,

scaling the magnitude response information of the low-shelving equalizer, and

shifting the scaled magnitude response information of the low-shelving equalizer along a frequency axis by a predetermined frequency amount.

5. The method of claim 1 , further comprising:

determining an index associated with the first frequency;

determining a lookup table index based on the index associated with the first frequency and further based on an output of one or more sensors of the wearable head device; and

accessing a lookup table via the lookup table index.

6. The method of claim 1 , further comprising:

detecting an action of the user of the wearable head device via one or more sensors of the wearable head device;

determining a parameter associated with the environment of the wearable head device, the parameter based on the detected action;

determining a lookup table index based on the index associated with the first frequency and further based on the output of the one or more sensors; and

accessing a lookup table via the lookup table index.

7. A wearable system comprising:

a wearable head device comprising one or more sensors and one or more speakers; and

one or more processors configured to perform a method comprising:

determining magnitude response information for a filter, the magnitude response information comprising a plurality of gain values, at least one of the plurality of gain values including a first gain corresponding to a first frequency;

at a first time, storing the magnitude response information for the filter;

determining one or more properties of an environment of a wearable head device;

determining a target magnitude response based on the one or more properties of the environment, the target magnitude response comprising one or more control frequencies and further comprising a target gain corresponding to a control frequency of the one or more control frequencies;

at a second time later than the first time, retrieving the magnitude response information for the filter;

determining an audio signal based on a selected portion of the magnitude response information, wherein the selected portion is selected based on the target gain; and

presenting the audio signal to a user of the wearable head device.

8. The wearable system of claim 7 , wherein the method further comprises:

presenting a test signal via one or more speakers of the wearable head device;

detecting a response signal via one or more sensors of the wearable head device; and

determining a relationship between the test signal and the response signal, wherein the audio signal is determined based on the relationship.

9. The wearable system of claim 7 , wherein the method further comprises:

determining a magnitude response information of a high-shelving equalizer,

scaling the magnitude response information of the high-shelving equalizer, and

shifting the scaled magnitude response information of the high-shelving equalizer along a frequency axis by a predetermined frequency amount.

10. The wearable system of claim 7 , wherein the method further comprises:

determining a magnitude response information of a low-shelving equalizer,

scaling the magnitude response information of the low-shelving equalizer, and

shifting the scaled magnitude response information of the low-shelving equalizer along a frequency axis by a predetermined frequency amount.

11. The wearable system of claim 7 , wherein the method further comprises:

determining an index associated with the first frequency;

determining a lookup table index based on the index associated with the first frequency and further based on an output of one or more sensors of the wearable head device; and

accessing a lookup table via the lookup table index.

12. The wearable system of claim 7 , wherein the method further comprises:

detecting an action of the user of the wearable head device via the one or more sensors;

determining a parameter associated with the environment of the wearable head device, the parameter based on the detected action;

determining a lookup table index based on the index associated with the first frequency and further based on the output of the one or more sensors; and

accessing a lookup table via the lookup table index.

13. A non-transitory computer-readable medium storing instructions which, when executed by one or more processors, cause the one or more processors to perform a method comprising:

determining magnitude response information for a filter, the magnitude response information comprising a plurality of gain values, at least one of the plurality of gain values including a first gain corresponding to a first frequency;

at a first time, storing the magnitude response information for the filter;

determining one or more properties of an environment of a wearable head device;

determining a target magnitude response based on the one or more properties of the environment, the target magnitude response comprising one or more control frequencies and further comprising a target gain corresponding to a control frequency of the one or more control frequencies;

at a second time later than the first time, retrieving the magnitude response information for the filter;

determining an audio signal based on a selected portion of the magnitude response information, wherein the selected portion is selected based on the target gain; and

presenting the audio signal to a user of the wearable head device.

14. The non-transitory computer-readable medium of claim 13 , wherein the method further comprises:

presenting a test signal via one or more speakers of the wearable head device;

detecting a response signal via one or more sensors of the wearable head device; and

determining a relationship between the test signal and the response signal, wherein the audio signal is determined based on the relationship.

15. The non-transitory computer-readable medium of claim 13 , wherein the method further comprises:

determining a magnitude response information of a high-shelving equalizer,

scaling the magnitude response information of the high-shelving equalizer, and

shifting the scaled magnitude response information of the high-shelving equalizer along a frequency axis by a predetermined frequency amount.

16. The non-transitory computer-readable medium of claim 13 , wherein the method further comprises:

determining a magnitude response information of a low-shelving equalizer,

scaling the magnitude response information of the low-shelving equalizer, and

shifting the scaled magnitude response information of the low-shelving equalizer along a frequency axis by a predetermined frequency amount.

17. The non-transitory computer-readable medium of claim 13 , wherein the method further comprises:

determining an index associated with the first frequency;

determining a lookup table index based on the index associated with the first frequency and further based on an output of one or more sensors of the wearable head device; and

accessing a lookup table via the lookup table index.

18. The non-transitory computer-readable medium of claim 13 , wherein the method further comprises:

detecting an action of the user of the wearable head device via the one or more sensors;

determining a parameter associated with the environment of the wearable head device, the parameter based on the detected action;

determining a lookup table index based on the index associated with the first frequency and further based on the output of the one or more sensors; and

accessing a lookup table via the lookup table index.

Assignments (3)
SECURITY INTEREST Recorded Oct 31, 2025
From: MAGIC LEAP, INC.; MENTOR ACQUISITION ONE, LLC; MOLECULAR IMPRINTS, INC.
To: CITIBANK, N.A., AS COLLATERAL AGENT
Reel/Frame 073422/0549 →
SECURITY INTEREST Recorded Oct 15, 2025
From: MAGIC LEAP, INC.; MENTOR ACQUISITION ONE, LLC; MOLECULAR IMPRINTS, INC.
To: CITIBANK, N.A., AS COLLATERAL AGENT
Reel/Frame 073109/0238 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 7, 2023
From: AUDFRAY, REMI SAMUEL; JOT, JEAN-MARC; DICKER, SAMUEL CHARLES
To: MAGIC LEAP, INC.
Reel/Frame 064832/0165 →
Continuity (5)
Continuation 17111318 · Dec 3, 2020
Continuation 16985941 · Aug 5, 2020
Continuation 16427315 · May 30, 2019
Provisional Application 62678259 · May 30, 2018
Related Publication 20230396923A1 · Dec 7, 2023
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