Audio equalization of audio environment
An example method of operation may include determining a frequency response to a measured chirp signal detected from one or more speakers, determining an average value of the frequency response based on a high limit value and a low limit value, subtracting a measured response from a target response, and the target response is based on one or more filter frequencies; determining a frequency limited target filter with audible parameters based on the subtraction, and applying an infinite impulse response (IIR) biquad filter based on an area defined by the frequency limited target filter to equalize the frequency response of the one or more speakers.
1. A method, comprising:
determining a frequency response to a measured chirp signal detected from one or more speakers;
determining an average value of the frequency response based on a high limit value and a low limit value;
subtracting a measured frequency response from the one or more speakers from a target response, wherein the target response is based on one or more filter frequencies;
determining a frequency limited target filter with audible parameters based on the subtraction; and
applying an infinite impulse response (IIR) biquad filter based on an area defined by the frequency limited target filter to equalize the frequency response of the one or more speakers.
2. The method of claim 1 , wherein the average value is set to zero decibels.
3. The method of claim 1 , wherein the target response is based on the one or more frequencies associated with one or more biquad filters.
4. The method of claim 3 , wherein the determining the target filter based on the target response comprises determining target zero crossings and target filter derivative zeros.
5. The method of claim 1 , comprising
limiting decibels of the target filter based on detected amplitude peaks to create a limited filter; and
adding the limited filter to a filter set.
6. The method of claim 5 , comprising
adding unlimited equalization filters to the measured response to provide an unlimited corrected response.
7. The method of claim 6 , comprising
subtracting the unlimited corrected response from the target response to provide a new target filter.
8. An apparatus, comprising:
a processor configured to
determine a frequency response to a measured chirp signal detected from one or more speakers;
determine an average value of the frequency response based on a high limit value and a low limit value;
subtract a measured frequency response from the one or more speakers from a target response, wherein the target response is based on one or more filter frequencies;
determine a frequency limited target filter with audible parameters based on the subtraction; and
apply an infinite impulse response (IIR) biquad filter based on an area defined by the frequency limited target filter to equalize the frequency response of the one or more speakers.
9. The apparatus of claim 8 , wherein the average value is set to zero decibels.
10. The apparatus of claim 8 , wherein the target response is based on the one or more frequencies associated with one or more biquad filters.
11. The apparatus of claim 10 , wherein the target filter is determined based on the target response by the processor being configured to determine target zero crossings and target filter derivative zeros.
12. The apparatus of claim 8 , wherein the processor is further configured to
limit decibels of the target filter based on detected amplitude peaks to create a limited filter; and
add the limited filter to a filter set.
13. The apparatus of claim 12 , wherein the processor is further configured to
add unlimited equalization filters to the measured response to provide an unlimited corrected response.
14. The apparatus of claim 13 , wherein the processor is further configured to
subtract the unlimited corrected response from the target response to provide a new target filter.
15. A non-transitory computer readable storage medium configured to store instructions that when executed cause a processor to perform:
determining a frequency response to a measured chirp signal detected from one or more speakers;
determining an average value of the frequency response based on a high limit value and a low limit value;
subtracting a measured frequency response from the one or more speakers from a target response, wherein the target response is based on one or more filter frequencies;
determining a frequency limited target filter with audible parameters based on the subtraction; and
applying an infinite impulse response (IIR) biquad filter based on an area defined by the frequency limited target filter to equalize the frequency response of the one or more speakers.
16. The non-transitory computer readable storage medium of claim 15 , wherein the average value is set to zero decibels.
17. The non-transitory computer readable storage medium of claim 15 , wherein the target response is based on the one or more frequencies associated with one or more biquad filters.
18. The non-transitory computer readable storage medium of claim 17 , wherein the determining the target filter based on the target response comprises determining target zero crossings and target filter derivative zeros.
19. The non-transitory computer readable storage medium of claim 15 , wherein the processor is further configured to perform:
limiting decibels of the target filter based on detected amplitude peaks to create a limited filter; and
adding the limited filter to a filter set.
20. The non-transitory computer readable storage medium of claim 19 , wherein the processor is further configured to perform:
adding unlimited equalization filters to the measured response to provide an unlimited corrected response; and
subtracting the unlimited corrected response from the target response to provide a new target filter.