Patents by Inventor Maurice G. Bellanger

Maurice G. Bellanger 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).

  • Patent number: 4485272
    Abstract: An electroacoustic transducer apparatus which prevents oscillations as a result of acoustic coupling between an acoustic-wave transmitter and a receiver. The transmitter and receiver each comprise an electro-acoustic transducer network. The transducers in each network are arranged so that the phase and amplitude of the signals applied to the transmitter transducers and the signals supplied to an adder circuit by the receiver network transducers (25) to (30) of the receiver network are such that in the oscillation frequency band the radiation pattern of the transmitter network and the directivity pattern of the receiver network are zero in at least one direction. The two networks are arranged relative to each other so that the directions of minimum radiation and directivity correspond to the directions of maximum coupling between the transducers of the two networks.
    Type: Grant
    Filed: March 3, 1982
    Date of Patent: November 27, 1984
    Assignee: Telecommunications Radioelectriques et Telephoniques T.R.T.
    Inventors: Tuan K. Duong, Emmanuel Lefort, Maurice G. Bellanger
  • Patent number: 4320362
    Abstract: In a filter in which, in order to obtain the desired filter characteristic, a weighted sum of different signals is formed, it is proposed in accordance with the invention that for the formation of said sum means are employed which are constituted by capacitor circuits, which during a first time interval are each charged by said signals, and by a connection circuit for the formation, during a second time interval, of the equivalent of a single capacitor across whose plates the weighted-sum signal appears.The invention is used for the filtration of sampled analog signals.
    Type: Grant
    Filed: July 18, 1979
    Date of Patent: March 16, 1982
    Assignee: Telecommunications Radioelectriques et Telephoniques T.R.T.
    Inventors: Maurice G. Bellanger, Jean Gaillard
  • Patent number: 4312062
    Abstract: System for digitally converting baseband channel signals into a frequency-division multiplex signal. The system comprises at its input converter circuits by each of which the sequence of codewords of the digital signal which correspond to each signal to be converted is divided into two interlaced sequences. The two devices required for processing each of the two digital signals supplied by the input circuits in the form of converters are combined so as to use in cascade a Fourier transformation device, a set of arithmetic units in the form of digital filters and a time-division multiplexer which supplies the desired multiplex signal. Use: multiplex transmission of speech signals.
    Type: Grant
    Filed: June 20, 1975
    Date of Patent: January 19, 1982
    Assignee: Telecommunications Radioelectriques et Telephoniques
    Inventors: Maurice G. Bellanger, Jacques L. Daguet