A radio paging receiver operates upon receipt of a predetermined, sequential paging signal having at least first and second code signals. The receiver receives and decodes the first predetermined code signal to produce a first decoded signal indicating the nature of a desired page. A second decoded signal...http://www.google.de/patents/US4330780?utm_source=gb-gplus-sharePatent US4330780 - Radio paging receiver having pre-recorded voice messages which are selected by address codes and read out responsive to a suffix code
