IP Library › Granted Patent US 10,524,078
Granted Patent B2
US 10,524,078 · App. 16/138,893 · Granted Dec 31, 2019

Crosstalk cancellation b-chain

Inventor: Zachary Seldess (San Diego, CA)
Assignee: Boomcloud 360, Inc.
H04S7/303H04R3/04H04R3/14H04R5/02H04R5/04H04S1/007H04S2400/13
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Quick Facts
Patent No.
US 10,524,078
App. No.
16/138,893
Granted
Dec 31, 2019
Kind
B2
Abstract

Embodiments relate to b-chain processing for a spatially enhanced audio signal. A system includes a b-chain processor. The b-chain processor determines asymmetries between the left speaker and the right speaker in frequency response, time alignment, and signal level for a listening position; and generates a left output channel for the left speaker and a right output channel for the right speaker by: applying an N-band equalization to the spatially enhanced signal to adjust for the asymmetry in the frequency response; applying a delay to the spatially enhanced signal to adjust for the asymmetry in the time alignment; and applying a gain to the spatially enhanced signal to adjust for the asymmetry in the signal level.

Claims (57)

1. A system for enhancing an input audio signal for a left speaker and a right speaker, comprising:

a spatial enhancement processor configured to generate a spatially enhanced signal by gain adjusting spatial components and nonspatial components of the input audio signal; and

a b-chain processor, configured to:

determine asymmetries between the left speaker and the right speaker in frequency response, time alignment, and signal level for a listening position; and

generate a left output channel for the left speaker and a right output channel for the right speaker by:

applying an N-band equalization to the spatially enhanced signal to adjust for the asymmetry in the frequency response;

applying a delay to the spatially enhanced signal to adjust for the asymmetry in the time alignment; and

applying a gain to the spatially enhanced signal to adjust for the asymmetry in the signal level.

2. The system of claim 1 , wherein the b-chain processor configured to apply the N-band equalization includes the b-chain processor being configured to apply one or more filters to at least one of a left spatially enhanced channel and a right spatially enhanced channel of the spatially enhanced signal.

3. The system of claim 2 , wherein the one or more filters balance frequency responses of the left speaker and the right speaker.

4. The system of claim 2 , wherein the one or more filters include at least one of:

a low-shelf filter and a high shelf filter;

a band-pass filter;

a band-stop filter;

a peak-notch filter; and

a low-pass filter and a high-pass filter.

5. The system of claim 1 , wherein the b-chain processor configured to apply the delay to the spatially enhanced signal includes the b-chain processor being configured to apply the delay to one of a left spatially enhanced channel or a right spatially enhanced channel of the spatially enhanced signal.

6. The system of claim 1 , wherein the b-chain processor configured to apply the gain to the spatially enhanced signal includes the b-chain processor being configured to apply the gain to one of a left spatially enhanced channel or a right spatially enhanced channel of the spatially enhanced signal.

7. The system of claim 1 , wherein the b-chain processor is further configured to adjust at least one of the delay and the gain according to a change in the listening position.

8. The system of claim 1 , wherein the delay and the gain adjust for the listening position being a non-equivalent distance from the left speaker and the right speaker.

9. The system of claim 1 , wherein the spatial enhancement processor is further configured apply a crosstalk compensation and a crosstalk cancellation to the input audio signal to generate the spatially enhanced audio signal.

10. A non-transitory computer readable medium storing instructions that, when executed by a processor, configure the processor to:

generate a spatially enhanced signal by gain adjusting spatial components and nonspatial components of an input audio signal including a left input channel for a left speaker and a right input channel for a right speaker;

determine asymmetries between the left speaker and the right speaker in frequency response, time alignment, and signal level for a listening position; and

generate a left output channel for the left speaker and a right output channel for the right speaker by:

applying an N-band equalization to the spatially enhanced signal to adjust for the asymmetry in the frequency response;

applying a delay to the spatially enhanced signal to adjust for the asymmetry in the time alignment; and

applying a gain to the spatially enhanced signal to adjust for the asymmetry in the signal level.

11. The non-transitory computer readable medium of claim 10 , wherein the instructions that configure the processor to apply the N-band equalization further include instructions that configure the processor to apply one or more filters to at least one of a left spatially enhanced channel and a right spatially enhanced channel of the spatially enhanced signal.

12. The non-transitory computer readable medium of claim 11 , wherein the one or more filters balance frequency responses of the left speaker and the right speaker.

13. The non-transitory computer readable medium of claim 11 , wherein the one or more filters include at least one of:

a low-shelf filter and a high shelf filter;

a band-pass filter;

a band-stop filter;

a peak-notch filter; and

a low-pass filter and a high-pass filter.

14. The non-transitory computer readable medium of claim 10 , wherein the instructions that configure the processor to apply the delay to the spatially enhanced signal further include instructions that configure the processor to apply the delay to one of a left spatially enhanced channel or a right spatially enhanced channel of the spatially enhanced signal.

15. The non-transitory computer readable medium of claim 10 , wherein the instructions that configure the processor to apply the gain to the spatially enhanced signal further include instructions that configure the processor to apply the gain to one of a left spatially enhanced channel or a right spatially enhanced channel of the spatially enhanced signal.

16. The non-transitory computer readable medium of claim 10 , further comprising instructions that configure the processor to adjust at least one of the delay and the gain according to a change in the listening position.

17. The non-transitory computer readable medium of claim 10 , wherein the delay and the gain adjust for the listening position being a non-equivalent distance from the left speaker and the right speaker.

18. The non-transitory computer readable medium of claim 10 , further comprising instructions that configure the processor to apply a crosstalk compensation and a crosstalk cancellation to the input audio signal to generate the spatially enhanced audio signal.

19. A method for enhancing an input audio signal for a left speaker and a right speaker, comprising:

generating a spatially enhanced signal by gain adjusting spatial components and nonspatial components of the input audio signal including a left input channel for the left speaker and a right input channel for the right speaker;

determining asymmetries between the left speaker and the right speaker in frequency response, time alignment, and signal level for a listening position; and

generating a left output channel for the left speaker and a right output channel for the right speaker by:

applying an N-band equalization to the spatially enhanced signal to adjust for the asymmetry in the frequency response;

applying a delay to the spatially enhanced signal to adjust for the asymmetry in the time alignment; and

applying a gain to the spatially enhanced signal to adjust for the asymmetry in the signal level.

20. The method of claim 19 , wherein applying the N-band equalization includes applying one or more filters to at least one of a left spatially enhanced channel and a right spatially enhanced channel of the spatially enhanced signal.

21. The method of claim 20 , wherein the one or more filters balance frequency responses of the left speaker and the right speaker.

22. The method of claim 20 , wherein the one or more filters include at least one of:

a low-shelf filter and a high shelf filter;

a band-pass filter;

a band-stop filter;

a peak-notch filter; and

a low-pass filter and a high-pass filter.

23. The method of claim 19 , further comprising adjusting at least one of the delay and the gain according to a change in the listening position.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 21, 2018
From: SELDESS, ZACHARY
To: BOOMCLOUD 360, INC.
Reel/Frame 046944/0268 →
Continuity (2)
Provisional Application 62592304 · Nov 29, 2017
Related Publication 20190166447A1 · May 30, 2019