Patent ID: 8064866

Claim:
A passive processing device for: a first audio signal path connecting a first audio signal source to an audio signal processing means of a device and a second audio signal path connecting a second audio signal source to said audio signal processing means, wherein the passive processing device is arranged to be interfaced on said first and second paths in a fully integrated way between said first and second audio signal sources and said audio signal processing means, respectively, wherein the passive processing device comprises: a first protection means for rejecting electrostatic discharges on said first path; a first rejection means for rejecting radio signals at least at a chosen frequency band on said first path; and a first AC-coupling means for interfacing voltage levels between said first audio signal source and said audio signal processing means; a second protection means for rejecting electrostatic discharges on said second path; a second rejection means for rejecting radio signals on said second path; and a second AC-coupling means for interfacing voltage levels between said second audio signal source and said audio signal processing means, wherein said first and second audio signal sources are positive and negative outputs of said device, respectively.