Patents by Inventor Renato Ambrosio

Renato Ambrosio 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).

  • Digital phase-locked loop circuits with storage of clock error signal
    Patent number: 4763342
    Abstract: The digital phase-locked loop circuit extracts the clock signal from a serial flow of coded data by operating so as to determine the phase of the received signal and comparing this phase with that of a locally-generated signal. The error signal obtained from the comparison is digitally filtered and used to correct the phase of local signal. The error with respect to the signal extracted from a prior data stream is stored and used to effect corrections even in the absence of the data flow at the input or in presence of long zero sequences.
    Type: Grant
    Filed: November 24, 1986
    Date of Patent: August 9, 1988
    Assignee: Cselt--Centro Studi e Laboratori Telecomunicazioni S.P.A.
    Inventors: Renato Ambrosio, Carlo M. Bruno
  • Echo canceller for bidirectional digital transmission
    Patent number: 4755984
    Abstract: The echo canceller for bidirectional digital transmission systems cancels the echo queues of a desired number N of digital symbols, transmitted on the line in the last N signalling periods. It consists of a part which effects very simply the summation of the last N transmitted symbols, so as to ease the system implementation by an integrated circuit, and of a part which computes the estimated sample of the echo-channel pulse response. The results of the two parts are multiplied by one another and the estimated echo signal is obtained.
    Type: Grant
    Filed: March 16, 1987
    Date of Patent: July 5, 1988
    Assignee: SIP-Societa' Italiana per l'Esercizio delle Telecomunicazioni P.A.
    Inventors: Renato Ambrosio, Carlo Bruno, Giorgio Paschetta, Adler Tofanelli
  • Bidirectional digital transmission system with echo-cancellation
    Patent number: 4713803
    Abstract: A bidirectional digital transmission system with echo-cancellation allows the measurement of the received data signal and the automatic adaptation of the attenuator and of the line equalizer. They are implemented by using circuits already present in a conventional system, in addition to auxiliary circuits.
    Type: Grant
    Filed: May 8, 1986
    Date of Patent: December 15, 1987
    Assignee: SIP--Societa Italiana per l'Esercizio Telefonico p.a.
    Inventors: Renato Ambrosio, Alberto Brosio, Alfredo Fausone, Adler Tofanelli