Aperture Science Announcement System

The Aperture Science Announcement System of masculine voice, is the main public address system used throughout the Aperture Science Enrichment Center in Portal 2.

In the beginning of the singleplayer campaign in Portal 2, Chell; a test subject of the enrichment center, is accompanied by the automated announcement system. The announcer tries to calm Chell throughout the ruined test chambers, assuring that she has to continue with the testing as she is the "future-starter". The announcer's primary role within the Test Chambers is to maintain testing until society has been rebuilt during what is supposedly an apocalypse, when in actuality, the facility was in ruins only because Chell had destroyed GLaDOS at the end of Portal.

It would appear that the announcer has a role outside the testing areas as well, where it detects GLaDOS as a corrupted core that is in charge of the facility. It proposes Wheatley as a substitute core and even allows the transfer process to impeach GLaDOS from her power over the entire facility.

The announcer remains throughout the entire game, implying that it is not a replacement of GLaDOS after her destruction in Portal. Given it's priority over GLaDOS and the ability to detect general facility conditions, the announcer would have supposedly existed since the first game, as it's duty over the enrichment center is clearly more than just an emergency backup guide for test subjects within testing areas.

Trivia

 * The announcer is programmed to detect sarcasm, as seen in Test Chamber 06 as GLaDOS sarcastically thanks you for murdering her. However it could not detect sarcasm from Wheatley when the announcer asks for a permission to impeach him, claiming Wheatley's response as a vague answer and interprets it as an agreement.