Patent claim: A system for adaptively processing audio commands supplied by a user in an aircraft cabin comprising the steps of one or more audio input devices adapted to receive ambient noise in the aircraft cabin and supply ambient noise signals representative thereof and to at least selectively receive audio and ambient noise and supply audio signals representative thereof and a processing system in operable communication with the one or more audio input devices the processing system configured to i sample and analyze the received ambient noise and based on the analysis implement one or more filter functions and adjust one or more filter parameters associated with the one or more selected filter functions and ii filter through the selected one or more filter functions the audio and ambient noise supplied to the one or more audio input devices to thereby supply filtered audio.

Related passage: In an exemplary embodiment the voice command recognition process 200 continues by receiving or otherwise sensing an audio input indicative of a desired voice command from the audio input device task 208.In this regard the audio input device 104 receives or otherwise senses sound and converts the sound to a corresponding electrical signal.In an exemplary embodiment the audio input device 104 generates an analog signal in response to receiving or otherwise sensing a sound and provides the analog signal to the processing system 108 which in turn converts the analog signal to a corresponding digital signal.In an exemplary embodiment the voice command recognition process 200 continues by filtering the audio input in a manner that is influenced by the identified operating state by filtering the audio input based on the acoustic noise model corresponding to the identified operating state task 210.In this regard in an exemplary embodiment the processing system 108 implements a digital filter based on the selected acoustic noise model for the identified flight phase andor operating state.For example the processing system 108 may identify particular frequencies of the acoustic noise model having relatively larger signal levels compared to surrounding frequencies e.g.peak frequencies or pole frequencies and implement a digital filter with zeros corresponding to the identified peak frequencies from the selected acoustic noise model.In this manner the received audio input signal is filtered based on the current flight phase andor operating state of the aircraft 122 resulting in a filtered audio input signal.In an exemplary embodiment the characteristics e.g.gainattenuation bandwidth roll off and the like of the digital filter are chosen such that the digital filter achieves a desired signaltonoise ratio SNR for the bandwidth corresponding to human speech e.g.100 Hz3 kHz.In other embodiments the processing system 108 may be configured to process the received audio input using noise cancelling techniques in conjunction with the acoustic noise model for the identified flight phase to obtain the filtered audio input signal.By the filtering the audio input based on the flight phase andor operating state the processing system 108 is capable of identifying or otherwise recognizing command words from the received audio input signal with increased accuracy andor reliability as described in greater detail below.