Systems and methods for blind sensitivity matching for microphone capsules in a microphone array

A system for sensitivity matching of microphone capsules in a microphone array, the system comprising:

• a processor;
• and
• a memory including instructions that, when executed by the processor, cause the processor to:
• determine, for at least two microphone capsules in a microphone array, an average raw sound exposure amplitude value;
• calculate an average error value for the at least two microphone capsules based on the average raw sound exposure amplitude value and respective sensitivity-adjusted exposure values for each microphone capsule of the at least two microphone capsules;
• determine, based on the average error value, a gain for at least one microphone capsule of the at least two microphone capsules;
• determine, based on a minimum gain value and a maximum gain value, a gain step value for each microphone capsule of the at least one microphone capsule of the at least two microphone capsules;
• adjust the gain of the at least one microphone capsule based on the gain step value;
• set a control value associated with the minimum gain value and the maximum gain value;
• and
• set the control value to a first control value during a startup phase and setting the control value to a second control value after the startup phase.

An apparatus for sensitivity matching of microphone capsules in a microphone array, the apparatus comprising:

• a vehicle controller configured to:
• receive, for each microphone capsule of at least two microphone capsules of a microphone array, a microphone input signal;
• determine an absolute value for each microphone input signal;
• determine, for the at least two microphone capsules, an average raw sound exposure amplitude value based on the absolute value based of each microphone input signal;
• calculate an average error value for the at least two microphone capsules based on the average raw sound exposure amplitude value and respective sensitivity-adjusted exposure values for each microphone capsule of the at least two microphone capsules, wherein the respective sensitivity-adjusted exposure values are based on the microphone input signal for each of the at least two microphone capsules;
• determine, based on the average error value, a gain for at least one microphone capsule of the at least two microphone capsules;
• determine, based on a minimum gain value and a maximum gain value, a gain step value for each microphone capsule of the at least one microphone capsule of the at least two microphone capsules;
• adjust the gain of the at least one microphone capsule based on the gain step value;
• set a control value associated with the minimum gain value and the maximum gain value;
• and
• set the control value to a first control value during a startup phase and setting the control value to a second control value after the startup phase.