Override for OEM audio signal equalizer
Apparatus and methods for processing an audio signal. The apparatus may include a digital signal processor (“DSP”) configured to receive an audio signal from a vehicular audio signal line. The audio signal may include a flat component and a compensatory component. The flat component may correspond to the audio signal in a state before combination with the compensatory component. The compensatory component may include an OEM EQ component. The apparatus may include a microprocessor in electronic communication with the DSP. The microprocessor may be configured to retrieve from the memory a restorative signal component. The microprocessor may be configured to instruct the DSP to apply the restorative signal component to the audio signal to reduce the audio signal to the flat component.
1. An apparatus for processing an audio signal, the apparatus comprising:
a processor configured to:
determine a restorative signal component for an audio signal on an audio signal line within a vehicle, the audio signal including a flat component and a compensatory component, the compensatory component including an equalization component applied by an equalizer included in the vehicle; and
apply the restorative signal component to the audio signal to acquire the flat component of the audio signal.
2. The apparatus of claim 1 , wherein the processor is configured to apply the restorative signal to the audio signal via a digital signal processor receiving the audio signal.
3. The apparatus of claim 1 , wherein the processor is configured to determine the restorative signal component by
determining a restorative function based on vehicle data of the vehicle, and
retrieving the restorative signal component from a machine-readable memory in electronic communication with the processor based on the restorative function.
4. The apparatus of claim 1 , wherein the processor is configured to determine the restorative signal component based on vehicle data, the vehicle data including at least one selected from a group consisting of a vehicle configuration parameter, a vehicle state value, and a vehicle transfer function.
5. The apparatus of claim 4 , wherein the vehicle configuration parameter includes at least one selected from a group consisting of a vehicle year, a vehicle make, and a vehicle model.
6. The apparatus of claim 4 , wherein the vehicle state value includes one of a plurality of audio volume control settings.
7. The apparatus of claim 4 , wherein the vehicle transfer function includes a transfer function applied by the equalizer included in the vehicle.
8. The apparatus of claim 1 , wherein the restorative signal component includes one or more weightings for one or more frequencies.
9. The apparatus of claim 8 , wherein the processor is configured to acquire the flat component of the audio signal by reducing one or more weightings of the compensatory component via the one or more weightings of the restorative signal component.
10. The apparatus of claim 8 , wherein the processor is configured to acquire the flat component of the audio signal by nullifying one or more weightings of the compensatory component via the one or more weightings of the restorative signal component.
11. The apparatus of claim 1 , wherein the restorative signal component includes one or more phase shifts for one or more frequencies.
12. The apparatus of claim 11 , wherein the processor is configured to acquire the flat component of the audio signal by reducing one or more phase shifts of the compensatory component via the one or more phase shifts of the restorative signal component.
13. The apparatus of claim 11 , wherein the processor is configured to acquire the flat component of the audio signal by nullifying one or more phase shifts of the compensatory component via the one or more phase shifts of the restorative signal component.
14. The apparatus of claim 1 , wherein the equalization component is a first equalization component and wherein processor is further configured to determine a second equalization component and apply the second equalization component to the flat component after applying the restorative signal component to the audio signal.
15. The apparatus of claim 14 , wherein the processor is configured to determine the second equalization component based on vehicle data, the vehicle data including at least one selected from a group consisting of a vehicle configuration parameter and a vehicle state value.
16. A method for providing an audio signal, the method comprising:
determining a restorative function based on vehicle data of a vehicle;
determining, based on the restorative function, a restorative signal component for an audio signal on an audio signal line within the vehicle, the audio signal including a flat component and a compensatory component, the compensatory component including an equalization component applied by an equalizer included in the vehicle; and
applying the restorative signal component to the audio signal to enhance the flat component of the audio signal.
17. The method of claim 16 , wherein applying the restorative signal to the audio signal to enhance the flat component of the audio signal includes applying the restorative signal to the audio signal to acquire the flat component of the audio signal.
18. The method of claim 16 , wherein applying the restorative signal to the audio signal to enhance the flat component of the audio signal includes instructing a digital signal processor receiving the audio signal to apply the restorative signal to the audio signal.
19. The method of claim 16 , wherein determining the restorative function based on the vehicle data includes determining the restorative function based on at least one selected from a group consisting of a vehicle configuration parameter, a vehicle state value, and a vehicle transfer function.
20. The method of claim 16 , wherein applying the restorative signal component to the audio signal to enhance the flat component includes applying one selected from a group consisting of a weighting and a phase shift included in the restorative signal component for one or more frequencies to the audio signal to reduce or nullify the compensatory component of the audio signal.