Device, system and process for audio signal processing

A system for noise-dependent audio signal processing, the system comprising:

• a gas mask or a helmet or a helmet and gas mask, the gas mask or the helmet or the helmet and gas mask having an area intended for an ear of a user of the gas mask;
• and
• a device for noise-dependent audio signal processing, the device comprising:
• a correction microphone arranged in an immediate vicinity of the area intended for an ear of a user of the device, the correction microphone being configured to pick up acoustic signals in the area intended for the ear and to output a correction signal corresponding to the picked up acoustic signals;
• a reference microphone arranged and configured to pick up surrounding noises from a surrounding area of the gas mask or the helmet or the helmet and gas mask and to output a reference signal corresponding to the pick up surrounding noises;
• a classification unit configured to receive the reference signal and to split the reference signal corresponding to a reference signal spectrum of the reference signal and a reference signal amplitude of the reference signal into signal components of at least one first class and at least one second class and to output a classified signal;
• an active noise cancellation unit configured to receive the correction signal to process the correction signal based on the classified signal and to output a corresponding audio signal;
• a speaker configured to receive the audio signal and to provide a corresponding acoustic signal output in the area intended for an ear of a user of the gas mask, wherein
• the classification unit is configured to output the reference signal in signal components of more than two classes;
• and
• the classes comprise at least one of the following groups of signals and/or noises:
• siren signals, vehicle noises, voice signals, pump noises, ventilation noises, fire noises.

A process for noise-dependent audio signal processing, the process comprising the steps of:

• picking up of acoustic signals in an area intended for an ear of a user of this process and forwarding a corresponding correction signal;
• picking up of noises surrounding a user and forwarding a corresponding reference signal;
• receiving the reference signal and splitting the reference signal corresponding to a reference signal spectrum and a reference signal amplitude into signal components of at least one first class and at least one second class and outputting of a corresponding classified signal;
• receiving the correction signal and processing the correction signal, based on the classified signal, by a provided active noise cancellation unit and outputting a corresponding audio signal from the provided active noise cancellation unit;
• and
• receiving of the audio signal and providing a corresponding acoustic signal output.