Patents Assigned to France Telecom & Telediffusion De France TDF
  • Digital time signal filtering method and device for transmission channel echo correction
    Patent number: 5768165
    Abstract: A method for filtering a time signal (e(t)) sampled in blocks of N samples (e(n),e(k)) uses a transfer function defined in the frequency domain by LN samples (H(K)). The transfer function is filtered by a time window (g1) of width N, and a frequency subsampling of ratio N is performed to give a partial transfer function defined over N samples (H1(k)). The method enables the complexity of circuits operating in real time to be optimized. The technique is particularly suitable for correcting long echoes in television picture receivers.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: June 16, 1998
    Assignee: France Telecom & Telediffusion De France TDF
    Inventors: Jacques Palicot, Moise Djoko Kouam, Jacques Veillard