System for determining the listening habits of wave signal receiver users

Claim 1

APPARATUS FOR MONITORING THE OPERATING CONDITION OF A PLURALITY OF WAVE SIGNAL RECEIVERS, COMPRISING A PLURALITY OF RECEIVER ATTACHMENTS RESPECTIVELY CONNECTED TO SAID RECEIVERS AND SEPARATED INTO FIRST AND SECOND GROUPS, A PLURALITY OF CODING MEANS RESPECTIVELY PROVIDED IN SAID ATTACHMENTS FOR PRODUCING OUTPUT SIGNALS INDICATIVE OF THE OPERATION OF THE ASSOCIATED RECEIVER, A CENTRAL OFFICE, A FIRST CIRCUIT CONNECTED BETWEEN SAID CENTRAL OFFICE AND SAID FIRST GROUP OF SAID ATTACHMENTS, A SECOND CIRCUIT CONNECTED BETWEEN SAID CENTRAL OFFICE AND SAID SECOND GROUP OF SAID ATTACHMENTS, MEANS IN SAID RECEIVER ATTACHMENTS TO CONNECT AND DISCONNECT THE OPERATING CONDITION SIGNALS FROM SAID CODING MEANS TO SAID CIRCUITS IN A PREDETERMINED SEQUENCE, A PLURALITY OF RECORDERS EACH CONNECTED TO ONE OF SAID FIRST AND SECOND CIRCUITS AND RESPONSIVE TO THE OPERATING CONDITION SIGNALS CONCURRENTLY RECEIVED FROM SAID CIRCUITS FOR RECORDING THE INDIVIDUAL OPERATING CONDITIONS OF SAID RECEIVERS IN THE FIRST AND SECOND GROUPS, AND ANOTHER RECORDER RESPONSIVE TO SAID OPERATING CONDITION SIGNALS FROM BOTH OF THE FIRST AND SECOND CIRCUITS FOR RECORDING THE TOTAL NUMBER OF SAID RECEIVERS OPERATING IN EACH OF A PLURALITY OF PREDETERMINED OPERATING CONDITIONS.