Digital signal processing software and hardware exclusively in the field of audio with use of one to multiple microphones to ensure noise reduction and audio signal for headsets; headsets for offices and call center use; headsets for use with computers; headsets for use with mobile phones and desk phones; headphones; earphones; speaker phones for use with computers, desk phones and mobile phones; accessories for the aforesaid goods, namely bottom cables for headsets, headset base stations, he...