Patent ID: 8170256

Claim:
A desktop telecommunication terminal comprising: a loudspeaker; a directional microphone including a front acoustical input port and a rear acoustical input port; a housing provided for encapsulating the directional microphone; an acoustic waveguide disposed in the housing to extend from the rear acoustical port of the microphone to a waveguide inlet on an upper surface of the telecommunication terminal, a length and a direction of the waveguide being tuned to reduce an acoustic distance between the loudspeaker and the rear acoustical input port of the microphone, approximating a free field acoustic distance, and the length and direction of the waveguide also being tuned to increase an acoustic distance between the rear acoustical input port and a sound source relative to the free field acoustic distance; and a facing surface configured to admit sound to the front acoustical input port of the microphone, the facing surface having at least one opening.