Patents Assigned to Totsu Co. Ltd.
  • System for conducting a television audience survey
    Patent number: 3947624
    Abstract: A method and apparatus for conducting a television audience survey in which a channel switch position detector and a television receiver on/off detector is attached to each television receiver in a sampled household and the information obtained from the channel switch position detectors is transmitted as a pulse train signal via a transmission media to a survey center. At the survey center, the pulse train signal is demodulated to recover the transmitted information which is processed in a computer as statistical data.
    Type: Grant
    Filed: November 1, 1974
    Date of Patent: March 30, 1976
    Assignee: Totsu Co. Ltd.
    Inventor: Nobuo Miyake