英語翻譯
Predefined signals recognition:Each predefined signal is emitted by loudspeaker A.Robots
have to signal any detected sound immediately.After a short break,the signal is emitted
by loudspeaker B,and after another short break it is emitted by loudspeaker A and B
simultaneously.Afterwards,this sequence is repeated once.The overall sequence is
the same for each predefined signal.So for two predefined signals it would look like
A,B,AB,A,B,AB,A’,B’,A’B’,A’,B’,A’B’ where ’ denotes the second predefined signal.