Managing characteristics of active noise reduction

A method for configuring an active noise reduction (ANR) headphone worn by a user based at least in part on a response of an ear of the user, the method comprising:

• receiving a first input signal captured by one or more sensors associated with an audio signal delivered to the ANR headphone;
• computing, by one or more processing devices, a frequency domain representation of the first input signal for a set of discrete frequencies, wherein the frequency domain representation of the first input signal is indicative of the response of the ear of the user to the audio signal;
• generating, by the one or more processing devices based on the frequency domain representation of the input signal, a set of parameters for a digital filter disposed in an ANR signal flow path of the ANR headphone, the set of parameters being such that a loop gain of the ANR signal flow path substantially matches a target loop gain, wherein generating the set of parameters comprises:
• accessing a nominal set of two or more parameters for the digital filter,
• determining, based on the frequency domain representation of the first input signal indicative of the response of the ear of the user to the audio signal, a set of two or more correction parameters, and
• generating the set of parameters as a combination of the nominal set of parameters and corresponding parameters in the set of correction parameters;
• and
• processing a second input signal in the ANR signal flow path using the generated set of parameters to generate an output signal for driving the electroacoustic transducer of the ANR headphone.