公开(公告)号：AT373458B

公开(公告)日：1984-01-25

申请号：AT299878

申请日：1978-04-26

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GANDINI FRANCESCO ,  GIANDONATO GIUSEPPE ,  IMPALLOMENI ENRICO ,  MONTAGNA ROBERTO

IPC: H04M11/06 ,  H04L27/00 ,  H04L27/18 ,  H04M11/00 ,  H04L5/00 ,  H04Q3/54

公开(公告)号：ATA299878A

公开(公告)日：1983-05-15

申请号：AT299878

申请日：1978-04-26

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GANDINI FRANCESCO ,  GIANDONATO GIUSEPPE ,  IMPALLOMENI ENRICO ,  MONTAGNA ROBERTO

IPC: H04M11/06 ,  H04L27/00 ,  H04L27/18 ,  H04M11/00 ,  H04L5/00 ,  H04Q3/54

公开(公告)号：DE69028434T2

公开(公告)日：1997-02-20

申请号：DE69028434

申请日：1990-05-02

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MONTAGNA ROBERTO ,  OMOLOGO MAURIZIO ,  SERENO DANIELE

IPC: G10L19/002 ,  G10L19/02 ,  G10L19/10 ,  G10L19/113 ,  G10L19/12 ,  G10L25/06 ,  H04B1/66 ,  G10L9/14

公开(公告)号：IT1119567B

公开(公告)日：1986-03-10

申请号：IT6917379

申请日：1979-11-08

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： IMPALLOMENI ENRICO ,  MONTAGNA ROBERTO

IPC: H04L25/03 ,  H04B

Abstract: A signal receiver of a QPSK data-transmission system comprises two noncoherent demodulators feeding digitized in-phase and quadrature components to a pair of transversal filters whose coefficients are read out, during successive keying intervals, from a read/write memory accessed by an arithmetic unit which generates corrective terms updating these coefficients. A comparator in the output of each filter detects estimated phase jumps between delayed and undelayed filtered samples of each signal component and delivers them to a decision circuit as well as to an error detector which also receives quantized output signals from the decision circuit to produce two error signals fed to the arithmetic unit; the latter further receives the delayed and undelayed filtered samples as well as ancillary data temporarily stored in these filters to calculate the corrective terms.

公开(公告)号：IT1082802B

公开(公告)日：1985-05-21

申请号：IT6796777

申请日：1977-05-02

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GANDINI FRANCESCO ,  GIANDONATO GIUSEPPE ,  IMPALLOMENI ENRICO ,  MONTAGNA ROBERTO

IPC: H04M11/06 ,  H04L27/00 ,  H04L27/18 ,  H04M11/00 ,  H04B

公开(公告)号：CA1106977A

公开(公告)日：1981-08-11

申请号：CA301762

申请日：1978-04-24

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GANDINI FRANCESCO ,  GIANDONATO GIUSEPPE ,  IMPALLOMENI ENRICO ,  MONTAGNA ROBERTO

IPC: H04M11/06 ,  H04L27/00 ,  H04L27/18 ,  H04M11/00 ,  G06F3/00

Abstract: The invention provides data sets for connecting a data terminal to an exchange of data network using ordinary telephone lines and links, the sets being used at either end of the line or link and comprising interface and modem functions implemented by a unit comprising a processing unit, which processes, organises, modulates and demodulates incoming and outgoing signals under the control of a control unit providing instructions from a stored program in response to timing signals provided by a timing unit. At the exchange end of the line the timing unit is slaved to the exchange clock, and at the data terminal the timing unit is phase and frequency locked to synchronizing signals received from the exchange.