-
公开(公告)号：DE3016371C2
公开(公告)日：1989-01-05
申请号：DE3016371
申请日：1980-04-28
Abstract: Data in the form of multi-value symbols is transmitted at a symbol rate 1/ DELTA T. At the receiver a decision circuit supplies estimates of the transmitted symbols on the basis of the received symbols. The present invention concerns compensating phase noise after equalization if any of the received symbols and before application of the received symbols to the decision circuit (38, 39). The received symbols are in complex form with in-phase and quadrature components yk' and yk'' respectively. Phase noise is compensated by complex multiplication in a multiplier (36) of the received symbols by a complex coefficient. The invention is particularly applicable to quadrature modulation systems, but if only one channel is transmitted the quadrature channel can be simulated using the Hilbert transform of the one channel.
-
公开(公告)号：DE2646216C2
公开(公告)日：1986-12-11
申请号：DE2646216
申请日：1976-10-13
Inventor： GAURIAT, GILLES, PARIS, FR , VERNEZY, JACQUES, VIROFLAY, FR , BARIGOT, JEAN-CLAUDE, BRIE COMTE ROBERT, FR
Abstract: PCM telephone transmission apparatus and particularly the use of several extra binary positions in a multiplex frame. These positions are used in one or several units auxiliary to the main unit which processes PCM telephone signals. The auxiliary unit(s) include(s) a signalling time base identical to the signalling time base of the main unit. The counting signals for this auxiliary time base are at a lower rate than the counting signals of the main unit, but they are applied in such a way that a part of the auxiliary time base counts at the same rate as the corresponding part of the time base in the main unit. This structure enables an evolutive use of the extra bits without modification of the main unit.
-
公开(公告)号：DE2534720C2
公开(公告)日：1986-07-10
申请号：DE2534720
申请日：1975-08-04
IPC: G03B27/50 , G03G15/22 , H04N1/00 , H04N1/04 , H04N1/10 , H04N1/12 , H04N1/16 , G03G15/04 , G03G15/00 , G02B26/10
Abstract: Copying and telecopying device using a mechanism ensuring the analysis of a document by a scanning beam which, transmitted from the document, is sent to a drum coated with selenium. According to the invention, the equipment is completed by a laser source whose beam can be directed along two parallel incident paths, to a helical mirror, one of the beams being used for the analysis of the document and the transmission of the information at a distance, the other beam being modulated by a facsimile signal and being directed onto the drum coated with selenium.
-
公开(公告)号：DE2549842C2
公开(公告)日：1985-05-30
申请号：DE2549842
申请日：1975-11-06
Inventor： ROCTON, LUCIEN, MALAKOFF, FR
Abstract: The invention relates to a connector for optical fibres. The connector between two fibres comprises a pressing assembly formed by three rolls inside a flexible casing and two cones partly engaged inside the pressing assembly, at its respective ends, and a means for actuating one of the cones in a linear movement to control the opening and closing of the pressing assembly on the ends of the fibres. The invention applies to the transmitting of data by a light beam.
-
公开(公告)号：DE2628907C2
公开(公告)日：1984-12-20
申请号：DE2628907
申请日：1976-06-28
Inventor： GAURIAT, GILLES, PARIS, FR , VERNEZY, JACQUES, VIROFLAY, FR , BARIGOT, JEAN-CLAUDE, BRIE COMTE ROBERT, FR
Abstract: A main pulse train at a main frequency and at least two derived pulse trains at submultiples of the main frequency are transmitted over a transmission path, from a transmitter to a receiver, in the form of pulses of alternating polarity. A first one of the derived pulse trains is transmitted as a single violation of bipolarity in the main pulse train while a second one of the derived pulse trains is transmitted as two successive violations of bipolarity in the main pulse train. The system is applicable to multiple synchronization (bit, frame etc . . . ) in a PCM digital transmission or switching system.
-
Patent Agency Ranking
公开(公告)号：DE2509619C2
公开(公告)日：1984-07-12
申请号：DE2509619
申请日：1975-03-05
Inventor： YVARD, MARCEL, 91290 ARPAJON, FR
IPC: H01Q13/02
-
公开(公告)号：DE2554443C2
公开(公告)日：1984-01-12
申请号：DE2554443
申请日：1975-12-03
Inventor： PARENT, GUY, LE PLESSIS ROBINSON, FR
-
公开(公告)号：DE2437355C2
公开(公告)日：1982-12-30
申请号：DE2437355
申请日：1974-08-02
Abstract: In a facsimile receiver wherein the printing bar is mounted for reciprocal movement between an operative position against the drum carrying the printing helix and an inactive position remote therefrom, means is provided for automatically displacing the printing bar toward its operative position upon rotation of said drum. In this regard a mechanical locking means is included for maintaining said printing bar in its operative position and a release mechanism serves to release the printing bar upon termination of the printing operation.
-
公开(公告)号：DE2125940C3
公开(公告)日：1982-03-25
申请号：DE2125940
申请日：1971-05-25
Inventor： MIONET, HUBERT, ANTONY, FR , BRONNER, FRANCOIS, FONTENAY-LE-FLEURY, FR , FRUTEAU, PIERRE, PARIS, FR
Abstract: A frequency source including an input circuit connected to receive an input pulse stream and arranged to direct alternate pulses into respective first and second amplifier systems whose outputs are combined in a summation element, and first and second logic circuits connected to receive the outputs of the respective amplifier systems and control signals from the input circuit and arranged to respond to a fault in the respective amplifier system by causing all the input pulses to pass to the other system.
-
公开(公告)号：DE2029712C2
公开(公告)日：1982-03-25
申请号：DE2029712
申请日：1970-06-16
-
-
-
-
-
-
-
-
-
Search Results
315
records
(took 0.032 seconds)
