Patents Examined by M. Haseman
  • Decoder for a frequency-keyed signal, particularly an FSK-video text signal
    Patent number: 4649551
    Abstract: Decoder for a frequency keyed signal, particularly an FSK videotext signal. To avoid isochronous distortions, precise matching of the decoder is necessary. Due to the provision of a additional AFC circuit (11) to regulate the natural frequency of the VCO (5) in the PLL loop (3-5) of the decoder, such matching is no longer required.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: March 10, 1987
    Assignee: Telefunken Fernseh und Rundfunk GmbH
    Inventors: Hans-Dieter Sander, Wulf-Christian Streckenbach