Patents by Inventor Gilbert Marie Marcel Ferrieu

Gilbert Marie Marcel Ferrieu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Transversal digital filter for delta coded signals
    Patent number: 3968354
    Abstract: A transversal digital filter including a shift register provided with a number of stages to which level control devices are connected by means of taps, the level control devices being connected to a feedback circuit which is connected through a combination device to the input of the shift register, a delta modulator being incorporated between the combination device and the input of the shift register, and a feedback circuit associated with the delta modulator forming part of the filter.
    Type: Grant
    Filed: July 17, 1974
    Date of Patent: July 6, 1976
    Assignee: T.R.T. Telecommunications Radioelectriques
    Inventor: Gilbert Marie Marcel Ferrieu
  • Vocoder system using delta modulation
    Patent number: 3952164
    Abstract: A speech transmission system employing a semi-vocoder comprising a spectral analyzer and a spectral synthesizer for the upper frequency range of the speech signal. The speech signal in the low frequency range base band is transmitted by using delta modulation and the delta-modulated base band signal is used directly in the receiver as a voice excitation signal for the spectral synthesizer.
    Type: Grant
    Filed: July 18, 1974
    Date of Patent: April 20, 1976
    Assignees: Telecommunications Radioelectriques et Telephoniques T.R.T., Etat Francais
    Inventors: Guy Albert Jules David, Gilbert Marie Marcel Ferrieu, Pierre Lorand, Michel Cartier