Dynamic Sound Adjustment

Abstract

Among other things, one or more non-transitory machine-readable media storing instructions are described. The stored instructions are executable by one or more processing devices to perform operations comprising analyzing an effect of noise in a spatial unit on sound in the spatial unit, at least part of the sound being produced by audio signals; selecting an adjustment curve among a group of adjustment curves based on one or more characteristics of the noise; and determining an amount of adjustment to be made to the audio signals based on the analyzed effect and the selected adjustment curve.

What is claimed is: 
     
         1 . One or more non-transitory machine-readable media storing instructions that are executable by one or more processing devices to perform operations comprising:
 obtaining a first signal that is present in a cabin of a vehicle comprising a first unwanted noise signal and a second desired audio signal that is produced by a vehicle audio system of the vehicle provided with an input signal;   adaptively filtering the first obtained signal to form an estimate of the first unwanted noise signal;   comparing a first measurement in a first frequency band of the estimated first unwanted noise signal with a second measurement in a second frequency band of the estimated first unwanted noise signal, the second frequency band being different from the first frequency band;   determining a first operating condition of the vehicle;   selecting, based on both the comparison and the determined first operating condition, a first gain to be applied to the vehicle audio system input signal to compensate for noise interference, and;   applying the first gain to one or more first signal components of the vehicle audio system input signal.   
     
     
         2 . The one or more non-transitory machine-readable media of  claim 1 , wherein comparing the first noise measurement with the second noise measurement comprises calculating a ratio of the first noise measurement in the first frequency band and the second noise measurement in the second frequency band. 
     
     
         3 . The one or more non-transitory machine-readable media of  claim 1 , further comprising:
 determining a second gain value based on the first comparison; and   applying the second gain value to one or more second signal components of the vehicle audio system input signal.   
     
     
         4 . The one or more non-transitory machine-readable media of  claim 3 , wherein the one or more first signal components are in a low frequency band, and the one or more second signal components are in a high frequency band. 
     
     
         5 . The one or more non-transitory machine-readable media of  claim 3 , wherein determining the second gain value comprises:
 based on the comparison of the first and second measurements of the estimated first unwanted noise signal and the determined first operating condition of the vehicle;   calculating a signal to noise ratio (SNR); and   determining the second gain value based on the calculated SNR and the determined first operating condition.   
     
     
         6 . The one or more non-transitory machine-readable media of  claim 3 , further comprising:
 determining a third gain value based on the first comparison; and   applying the third gain value to one or more third signal components of the vehicle audio system input signal.   
     
     
         7 . The one or more non-transitory machine-readable media of  claim 6 , wherein the one or more first signal components are in a low frequency band, the one or more second signal components are in a high frequency band, and wherein the one or more third signal components are in a mid-frequency band, at least some frequencies of the one or more third signal components being lower than frequencies of the high frequency band and higher than frequencies of the low frequency band. 
     
     
         8 . The one or more non-transitory machine-readable media of  claim 6 , wherein determining the third gain value comprises:
 based on the comparison of the first and second measurements of the estimated first unwanted noise signal and the determined first vehicle operating condition;   calculating a signal to noise ratio (SNR); and   determining the third gain value based on the calculated SNR and the determined first vehicle operating condition.   
     
     
         9 . The one or more non-transitory machine-readable media of  claim 1  further comprising:
 a second comparison comparing a third measurement in the first frequency band of the estimated first unwanted noise signal with a fourth measurement in the second frequency band of the estimated first unwanted noise signal; 
 determining a second operating condition of the vehicle; 
 selecting, based on both the determined second operating condition and the second comparison a fourth gain to be applied to the vehicle audio system input signal to compensate for noise interference, wherein the fourth gain may differ from the first gain, even if results of the first and second comparisons are the same. 
 
     
     
         10 . The one or more non-transitory machine-readable media of  claim 9 , wherein comparing the third noise measurement with the fourth noise measurement comprises calculating a ratio of the third noise measurement in the first frequency band and the fourth noise measurement in the second frequency band. 
     
     
         11 . The one or more non-transitory machine-readable media of  claim 1 , wherein the first measurement of the estimated first unwanted noise signal comprises first noise energy in the first frequency band, and the second measurement of the estimated first unwanted noise signal comprises second noise energy in the second frequency band. 
     
     
         12 . A controller comprising:
 a processor; and   a storage device that stores a program for execution by the processor, the program comprising instructions configured to cause the processor to perform operations comprising:   comparing a first measurement of an estimated first unwanted noise signal in a first frequency band with a second measurement of the estimated first unwanted noise signal in a second frequency band, the second frequency band being different from the first frequency band;   selecting, based on the comparison, a predetermined adjustment map, wherein the predetermined adjustment map relates a gain to be applied to an input signal of a vehicle audio system of a vehicle to compensate for noise interference to a first signal to noise ratio, wherein the first signal to noise ratio relates an audio signal produced by the vehicle audio system to the estimated first unwanted noise signal, wherein the adjustment map was predetermined for a first set of operating conditions of the vehicle;   determining a first gain value based on the signal to noise ratio and the selected map; and   applying the first gain value to one or more first signal components of the input signal of the vehicle audio system of the vehicle.   
     
     
         13 . The controller of  claim 12 , wherein the operations of comparing the first measurement the estimated first unwanted noise signal with the second measurement the estimated first unwanted noise signal comprise operations of calculating a ratio of the first measurement in the first frequency band and the second measurement in the second frequency band. 
     
     
         14 . The controller of  claim 12 , wherein the operations of identifying the first adjustment map comprise interpolating the first adjustment map from a first predefined set of adjustment maps. 
     
     
         15 . The controller of  claim 12 , further comprising instructions configured to cause the processor to perform operations comprising:
 determining a second gain value based on the comparison; and   applying the second gain value to one or more second signal components of the input signal of the vehicle audio system of the vehicle.   
     
     
         16 . The controller of  claim 15 , wherein the one or more first signal components are in a low frequency band, and the one or more second signal components are in a high frequency band. 
     
     
         17 . The controller of  claim 15 , wherein operations of determining the second gain value comprise:
 identifying a second adjustment map based on the comparison of the first and second measurements of the estimated first unwanted noise signal;   calculating a signal to noise ratio (SNR); and   determining the second gain value based on the calculated SNR and the second adjustment map.   
     
     
         18 . The controller of  claim 15 , further comprising instructions configured to cause the processor to perform operations comprising:
 determining a third gain value based on the comparison; and   applying the third gain value to one or more third signal components of the input signal of the vehicle audio system of the vehicle.   
     
     
         19 . The controller of  claim 18 , wherein the one or more first signal components are in a low frequency band, the one or more second signal components are in a high frequency band, and wherein the one or more third signal components are in a mid-frequency band, at least some frequencies of the one or more third signal components being lower than frequencies of the high frequency band and higher than frequencies of the low frequency band. 
     
     
         20 . The controller of  claim 18 , wherein operations of determining the third gain value comprise:
 identifying a third adjustment map based on the comparison of the first and second measurements of the estimated first unwanted noise signal;   calculating a signal to noise ratio (SNR); and   determining the third gain value based on the calculated SNR and the third adjustment map.