Electronic device and method for testing and teaching

Claim 1

A TEACHING DEVICE FOR USE WITH A RECORD MEMBER HAVING STORED THEREON A COMPOSITE SIGNAL REPRESENTING QUESTIONS AND THE LIKE IN THE FORM OF AN AUDIO SIGNAL FOR QUESTIONS AND THE LIKE IN THE FORM OF AN AUDIO SIGNAL FOR VERBAL REPRODUCTION WHICH ALTERNATES WITH ANSWERS IN THE OF A SELECTED FREQUENCY, AND IN WHICH THE AUDIO SIGNAL HAS REMOVED THEREFROM AT LEAST A NARROW FREQUENCY BAND CENTERED ABOUT SAID SELECTED FREQUENCY, SAID TEACHING DEVICE COMPRISING: COMPOSITE SIGNAL REPRODUCING MEANS INCLUDING A DRIVE MEANS FOR REPRODUCING SAID COMPOSITE SIGNAL STORED UPON SAID RECORD MEMBER WHEN SAID DRIVE MEANS ADVANCES SAID RECORD MEMBER; GATING MEANS FOR GATING SAID COMPOSITE SIGNAL; FILTER MEANS FOR REMOVING SAID AUDIO SIGNAL FROM SAID COMPOSITE SIGNAL; SPEAKER MEANS RESPONSIVE TO SAID GATED COMPOSITE SIGNAL FOR AUDIBLY REPRODUCING SAID AUDIO SIGNAL; DELAY MEANS RESPONSIVE TO SAID FILTERED COMPOSITE SIGNAL AND OPERATIVE RESPONSIVE A DELAY PULSE AFTER BEING TRIGGERED BY THE FIRST CODE SIGNAL, THE TIME DELAY BETWEEN THE FIRST CODE SIGNAL AND SAID DELAYED PULSE BETWEEN THE FIRST CODE SIGNAL AND SAID DELAYED PULSE BESEQUENCE COMPRISING THE MAXIMUM NUMBER OF CODE SIGNALS TO SAID DELAY MEANS; DRIVE SWITCH MEANS ASSOCIATED WITH SAID DRIVE MEANS AND RESPONSIVE TO SAID DELAYED PULSE, SAID DRIVE SWITCH MEANS TURNING SAID DRIVE MEANS OFF IN RESPONSE TO SAID DELAYED PULSE; SERIAL DECODER MEANS RESPOONSIVE TO SAID CODE SIGNALS OF SAID FILTERED COMPOSITE SIGNAL AND OPERATIVE TO ADVANCE ITS OUTPUT POSITION BY ONE STEP WITH EACH APPLIED CODE SIGNAL, FROM A RESET POSITION, EACH POSITION HAVING AN OUTPUT TERMINAL AND THE OUTPUT TERMINAL