公开(公告)号：DE3374109D1

公开(公告)日：1987-11-19

申请号：DE3374109

申请日：1983-10-28

Applicant: IBM ,  IBM FRANCE

Inventor： CALLENS PAUL ,  GALAND CLAUDE ,  PLATEL GUY ,  VERMOT-GAUCHY ROBERT

IPC: G11C11/41 ,  G10L19/02 ,  G11C11/411 ,  H03K3/286 ,  H04B1/66 ,  H04L1/00

Abstract: Input to a controller (42) is demodulated by a double-sideband quadrature-carrier modem supplying bits to a microprocessor (70) with a buffer memory (50) for a given number of packets. A validation device (52) checks the content and number of each packet for arrival in the correct sequence. The contents of each valid packet are distributed among the decoders via demultiplexers (11) sepg. signal data from HF band energy and partial autocorrelation coefft. data. The signal in each subband of coded sequences on either side of a missing sequence is analysed and used to conserve periodicity while avoiding abrupt transitions between received and reconstituted signals.

公开(公告)号：DE3479468D1

公开(公告)日：1989-09-21

申请号：DE3479468

申请日：1984-05-23

Applicant: IBM ,  IBM FRANCE

Inventor： CALLENS PAUL ,  NOAILLY PHILIPPE ,  GALAND CLAUDE ,  SECONDO PIERRE ,  GERGAUD CLAUDE

IPC: H04M3/00 ,  H04J3/17 ,  H04L12/64 ,  H04L11/20

Abstract: A method of transmitting digitized voice signals as packets of bits in a digital transmission network to which a plurality of terminals acting as sources of voice signals are attached. The method includes, at the transmitting end and for each source, the steps of: a dividing the signal into successive, digitally-coded segments; performing a so-called source activity detection; and assembling the bits resulting from the coding operation into packets, each packet being provided with a header containing, in particular, a parity bit whose logic value is modified whenever an inactivity or long pause is detected. At the receiving end, detection of a change in the value of said parity bit causes the delivery of a packet of bits to the decoder/synthesizer to be delayed by a given time interval called retention delay.

公开(公告)号：DE3276651D1

公开(公告)日：1987-07-30

申请号：DE3276651

申请日：1982-11-26

Applicant: IBM ,  IBM FRANCE

Inventor： GALAND CLAUDE ,  DAULASIM KHAMPHUC

IPC: H03M1/12 ,  G06T9/00 ,  H03M7/30 ,  H04B1/66 ,  H04B14/04

公开(公告)号：DE3171990D1

公开(公告)日：1985-10-03

申请号：DE3171990

申请日：1981-04-30

Applicant: IBM ,  IBM FRANCE

Inventor： BERAUD JEAN-PAUL ,  ESTEBAN DANIEL ,  GALAND CLAUDE

IPC: H03M3/02 ,  H03M7/30 ,  H04B1/66 ,  H04B14/04

Abstract: This improved speech signal Block Coded PCM (BCPCM) system reduces the number of bits allocated to transmitting the scale factor, thereby releasing bits for allocation to coding samples in the associated block of samples. The scale factor (c) is calculated for every 16 millisecond block of samples. However, the scale factor will be transmitted only once per 32 millisecond block if there is no significant difference between the two sequential values. The original speech signal is split into 16 frequency subbands, each subband initials sampled and 12-bit coded, then requantized in BCPCM at dynamically variable bit rates depending on the scale factor transmission rate.

公开(公告)号：DE3167257D1

公开(公告)日：1985-01-03

申请号：DE3167257

申请日：1981-02-27

Applicant: IBM ,  IBM FRANCE

Inventor： BERAUD JEAN-PAUL ,  GALAND CLAUDE

IPC: H04B1/66 ,  H04B3/20 ,  H04B14/04

公开(公告)号：DE3370423D1

公开(公告)日：1987-04-23

申请号：DE3370423

申请日：1983-06-07

Applicant: IBM ,  IBM FRANCE

Inventor： DESBLACHE ANDRE ,  GALAND CLAUDE ,  VERMOT-GAUCHY ROBERT

IPC: G10L11/02 ,  H04J3/16 ,  H04J3/17

公开(公告)号：DE3270212D1

公开(公告)日：1986-05-07

申请号：DE3270212

申请日：1982-04-30

Applicant: IBM ,  IBM FRANCE

Inventor： CALLENS PAUL ,  GALAND CLAUDE

IPC: H03M7/30 ,  H04B1/66 ,  H04B14/04 ,  H04J3/00

Abstract: This coder dispatches the bits resulting from the coding operation of a speech signal into a format for transmission at a rate chosen from a plurality of predetermined transmission rates. More specifically, the contents of at least part of the speech signal frequency bandwidth is split into several sub-bands. Said sub-bands are regrouped into sub-groups, each of said sub-groups corresponding to at least one of said possible transmission rates, i.e. to at least one sub-group coding bit rate. The signal samples belonging to each sub-group are recoded through a dynamical allocation of requantizing steps between the sub-bands. The obtained bits resulting from the recoding are dispatched into a multirate frame according to the sub-group which they belong to.

公开(公告)号：DE3267481D1

公开(公告)日：1986-01-02

申请号：DE3267481

申请日：1982-02-09

Applicant: IBM ,  IBM FRANCE

Inventor： GALAND CLAUDE

IPC: G10L13/00 ,  G10L19/00 ,  H03M7/30 ,  H04B1/66 ,  H04B14/04 ,  H04J3/17 ,  H04J3/22

Abstract: In a TASI system using dynamic subband allocation and BCPCM (Block Companded PCM), losses due to freeze-out or delay are avoided by use of a multi-rate macro-frame format, wherein switching to a lower rate (24, 16, or 8 Kbs) for one or more of the input channels is accommodated by simply dropping one or more sections of each signal frame, since the lower rate bits are distributed over the entire frame.

公开(公告)号：DE3174560D1

公开(公告)日：1986-06-12

申请号：DE3174560

申请日：1981-07-28

Applicant: IBM ,  IBM FRANCE

Inventor： GALAND CLAUDE ,  NUSSBAUMER HENRI

IPC: G10L19/02 ,  H03M7/30 ,  H04B1/66 ,  H04B14/04 ,  H04J99/00 ,  H04M11/00 ,  H04M11/06

Abstract: The method allows voice and data information to be concentrated over a reduced number of telephone lines. It consists mainly in processing each voice signal to extract therefrom a so-called analog base band signal and digitally coded characteristic parameters. Said parameters are then multiplexed with pure data and submitted to a modulation operation. The analog signal resulting from the modulation is then added to the base band before being transmitted over a telephone line.

公开(公告)号：DE60130844T2

公开(公告)日：2008-07-17

申请号：DE60130844

申请日：2001-07-05

Applicant: IBM

Inventor： GALAND CLAUDE ,  LE PENNEC JEAN-FRANCOIS

IPC: H04L45/02

Abstract: Data communication system of the type wherein a plurality of contiguous transmission networks constitute an Autonomous System (AS) using the Open Shortest Path First (OSPF) protocol for the exchange of information. The system is divided into several areas including an area 0 or backbone responsible for distributing routing information between the other areas. The backbone is divided into two sub-areas and comprises at least a pair of adjacent splitting routers. The first splitting router is included in one sub-area and the second splitting router is included in the other sub-area. The topological data base of each splitting router is configured to define a high metric for the link between the splitting routers in order to prevent any type of data traffic other than link-state messages (LSA) from being transmitted between the splitting routers.