Patents Assigned to Etat Francais, Represente Par Le Secretariat D'etat Aux Post Es Et Telecommunications (Centre National D'etudes Des Telecommunications)
  • Method of digital sound broadcasting in television channels with spectrum interlacing
    Patent number: 4884139
    Abstract: Digital broadcasting of a sound program takes place in a channel of a set of channels. In each channel other than that dedicated to digital broadcasting, the television channel has a spectrum of spectral lines separated by low spectral power density intervals. Digital broadcast is achieved by digital modulation (for instance OFDM) of the transmission with frequency multiplexing using a spectrum interlaced with that of the television. The digital signal is recovered by comb filtering on reception.
    Type: Grant
    Filed: December 23, 1987
    Date of Patent: November 28, 1989
    Assignee: Etat Francais, Represente Par Le Secretariat D'etat Aux Post Es Et Telecommunications (Centre National D'etudes Des Telecommunications)
    Inventor: Daniel Pommier