Audio signal correction and calibration for a room environment

Patent metadata

Field	Value
Publication number	US-10028055-B2
Application number	US-201715641271-A
Country	US
Kind code	B2
Filing date	Jul 4, 2017
Priority date	Dec 11, 2012
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

Disclosed are an apparatus and method of processing an audio signal to optimize audio for a room environment. One example method of operation may include recording the audio signal generated within a particular room environment and processing the audio signal to create an original frequency response based on the audio signal. The method may also include identifying a target sub-region of the frequency response which has a predetermined area percentage of a total area under a curve generated by the frequency response, determining whether the target sub-region is a narrow energy region, creating a filter to adjust the frequency response, and applying the filter to the audio signal.

First claim

What is claimed is:

1. A method, comprising:
identifying a target sub-region of a frequency response that is determined to be a narrow energy region;
creating a new flattened sub-region based on the target sub-region;
adjusting the frequency response, via at least one filter that includes at least one parameter based on the flattened sub-region; and
applying the at least one filter to an audio signal.

2. The method of claim 1 , further comprising:
calculating a frequency, a quality factor (Q) and a gain (G) of the target sub-region;
determining whether the Q is greater than a predefined Q threshold and whether the G is less than a predefined G threshold; and
if the Q is greater than the predefined Q threshold and the G is less than the predefined G threshold then determining that the target sub-region is the narrow energy region.

3. The method of claim 1 , wherein the target sub-region of the frequency response has a predetermined area percentage of a total area under a curve generated by the frequency response.

4. The method of claim 2 , further comprising creating at least one filter based on a new frequency, Q value and G value of the flattened sub-region.

5. The method of claim 1 , further comprising creating a new frequency response based on the target sub-region and the at least one filter.

6. The method of claim 5 , further comprising subtracting the frequency response from the new frequency response.

7. The method of claim 2 , wherein the predefined Q threshold is 10 and the predefined G threshold is 0.5.

8. An apparatus, comprising:
a memory; and
a processor configured to:
identify a target sub-region of a frequency response that is determined to be a narrow energy region;
create a new flattened sub-region based on the target sub-region;
adjust the frequency response, via at least one filter that includes at least one parameter based on the flattened sub-region; and
apply the at least one filter to an audio signal.

9. The apparatus of claim 8 , wherein the processor is further configured to:
calculate a frequency, a quality factor (Q) and a gain (G) of the target sub-region;
determine whether the Q is greater than a predefined Q threshold and whether the G is less than a predefined G threshold; and
if the Q is greater than the predefined Q threshold and the G is less than the predefined G threshold then determine that the target sub-region is the narrow energy region.

10. The apparatus of claim 8 , wherein the target sub-region of the frequency response has a predetermined area percentage of a total area under a curve generated by the frequency response.

11. The apparatus of claim 9 , wherein the filter is also configured to create the at least one filter based on a new frequency, Q value and G value of the flattened sub-region.

12. The apparatus of claim 8 , wherein the processor is also configured to create a new frequency response based on the target sub-region and the at least one filter.

13. The apparatus of claim 12 , wherein the processor is also configured to subtract the frequency response from the new frequency response.

14. The apparatus of claim 9 , wherein the predefined Q threshold is 10 and the predefined G threshold is 0.5.

15. A non-transitory computer readable storage medium comprising instruction that when read by a processor perform:
identifying a target sub-region of a frequency response that is determined to be a narrow energy region;
creating a new flattened sub-region based on the target sub-region;
adjusting the frequency response, via at least one filter that includes at least one parameter based on the flattened sub-region; and
applying the at least one filter to an audio signal.

16. The non-transitory computer readable storage medium of claim 15 , wherein the processor is further configured to perform:
calculating a frequency, a quality factor (Q) and a gain (G) of the target sub-region;
determining whether the Q is greater than a predefined Q threshold and whether the G is less than a predefined G threshold; and
if the Q is greater than the predefined Q threshold and the G is less than the predefined G threshold then determining that the target sub-region is the narrow energy region.

17. The non-transitory computer readable storage medium of claim 15 , wherein the target sub-region of the frequency response has a predetermined area percentage of a total area under a curve generated by the frequency response.

18. The non-transitory computer readable storage medium of claim 16 , wherein the processor is further configured to perform creating the at least one filter based on a new frequency, Q value and G value of the flattened sub-region.

19. The non-transitory computer readable storage medium of claim 15 , wherein the processor is further configured to perform creating a new frequency response based on the target sub-region and the at least one filter.

20. The non-transitory computer readable storage medium of claim 16 , wherein the processor is further configured to perform subtracting the frequency response from the new frequency response, and wherein the predefined Q threshold is 10 and the predefined G threshold is 0.5.

Assignees

• Amx Llc

Inventors

• Nackvi Fawad

Classifications

• H04R25/48

  using constructional means for obtaining a desired frequency response (H04R25/652 takes precedence) · CPC title

• H04R9/18

  Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency · CPC title

• H03G5/165

  Equalizers; Volume or gain control in limited frequency bands · CPC title

• H04R1/26

  Spatial arrangements of separate transducers responsive to two or more frequency ranges · CPC title

• H03F2200/429

  Two or more amplifiers or one amplifier with filters for different frequency bands are coupled in parallel at the input or output · CPC title