The Voice Tracker™ I array microphone is ideal for this since its 8 always on microphone elements use beamforming to create a “listening beam” that is automatically and electronically steered toward the active talker, creating an improved signal to noise ratio.
The Voice Tracker™ I is effective at ranges of 30 ft with a 360 degree field of view.
The Voice Tracker™ I has been used by more than 400 Universities since 2002 and has proven to be extremely reliable and easy to use.
See some user comments from it use with the following products:
Several Voice Trackers can be combined with a mixer or simple 3.5mm Y to increase pick range and sound quality. For example, two were combined to provide a 60 ft pickup range.
The Voice Tracker™ I can be placed on a table or podium, or it can be mounted on a wall or ceiling using its built in ceiling mount.