公开(公告)号：DE69930929D1

公开(公告)日：2006-05-24

申请号：DE69930929

申请日：1999-04-28

Applicant: ERICSSON TELEFON AB L M

Inventor： EKUDDEN ERIK ,  SVENSSON TOMAS ,  SUNDQVIST JIM

IPC: G10L19/12 ,  H04L12/56 ,  G10L19/00 ,  H04L1/00 ,  H04L1/22 ,  H04L12/64

Abstract: A decoder improves delayed packet concealment in a packet network by using two decoder sections. A first decoder section bases its decoding during the concealment phase on erroneous filter states and a set of speech parameters, whereas a second decoder section bases its decoding on saved and updated filter states and the same speech parameters. The outputs of the two decoder sections are thereafter combined to form the final speech signal. This decoding strategy produces a speech signal with smooth transitions from delayed to non-delayed packets and uses information from the most recent packets for speech generation.

公开(公告)号：SE0002016L

公开(公告)日：2001-12-01

申请号：SE0002016

申请日：2000-05-31

Applicant: ERICSSON TELEFON AB L M

Inventor： SUNDQVIST JIM ,  LENNESTAAL HAAKAN ,  NOHLGREN ANDERS ,  LINDQVIST MORGAN ,  WANG WEI

IPC: H04L12/64

Abstract: The present invention relates to a receiver system in a communication system supporting packet-based communicatior (e.g., an IP-network), including a receiver, speech decoder ( 40 ) and a jitter buffer ( 20 ) for handling delay variations in the reception of a speech signal consisting of packets containing frames with encoded speech. A jitter buffer controller ( 50 ) is provided for keeping information about the functional size of the jitter buffer ( 20 ) and for providing the speech decoder ( 40 ) with control information, such that the speech decoder ( 40 ), based on that information. provides a dynamic adaptation of the size of the jitter buffer ( 20 ) using the received encoded, packetized speech signal. The invention also relates to a method of adapting the functional size of the jitter buffer of a receiver system.

公开(公告)号：AU6744100A

公开(公告)日：2001-04-30

申请号：AU6744100

申请日：2000-08-11

Applicant: ERICSSON TELEFON AB L M

Inventor： SUNDQVIST JIM ,  HARASZTI ZSOLT ,  SVANBRO KRISTER ,  JONSSON LARS-ERIK ,  AYADURAI VICKNESAN

IPC: H04L29/06 ,  H04L12/56 ,  H04L12/801 ,  H04L12/00

Abstract: In packet communication paths that include header compression, header fields of packets to be communicated are altered. The alteration of the header fields does not disturb their functionality, and is transparent to the header compression scheme of the packet communication path. The altered header fields are provided for compression by the header compression scheme, resulting in improved performance of the header compression scheme. Performance improvements can also be achieved in packet communication paths that do not use header compression, by violating the integrity of header fields in packets to be transmitted over the packet communication path.

公开(公告)号：AU7326500A

公开(公告)日：2001-04-10

申请号：AU7326500

申请日：2000-09-01

Applicant: ERICSSON TELEFON AB L M

Inventor： SUNDQVIST JIM ,  FRANKKILA TOMAS ,  NOHLGREN ANDERS

IPC: H04J3/06 ,  G10L13/00

公开(公告)号：SE9903223D0

公开(公告)日：1999-09-09

申请号：SE9903223

申请日：1999-09-09

Applicant: ERICSSON TELEFON AB L M

Inventor： SUNDQVIST JIM ,  NOHLGREN ANDERS ,  FRANKKILA TOMAS

IPC: H04J3/06 ,  G01L

公开(公告)号：CA2363591C

公开(公告)日：2009-10-06

申请号：CA2363591

申请日：2000-02-25

Applicant: ERICSSON TELEFON AB L M

Inventor： SUNDQVIST JIM ,  WESTBERG LARS ,  SVANBRO KRISTER

IPC: H04L1/00 ,  H04L29/06 ,  H04L12/56

Abstract: The soft state of a header compression scheme in a communication system carrying packet traffic including a real time communication signal can be updated (63) during periods of communication signal inactivity (62), during which there is no need to transmit the communication signal. The header compression soft state can also be updated by stealing bits (83, 84) from the communication signal to carry the header update information (73). If the communication signal includes source encoded data, the header compression soft state can be updated selectively (126) based on the bit rate (122, 124) of a codec that produced the source encoded data.

公开(公告)号：AT367038T

公开(公告)日：2007-08-15

申请号：AT01937059

申请日：2001-05-22

Applicant: ERICSSON TELEFON AB L M

Inventor： SUNDQVIST JIM ,  LENNESTAL HAKAN ,  NOHLGREN ANDERS ,  LINDQVIST MORGAN ,  WANG WEI

IPC: H04L12/64

Abstract: The present invention relates to a receiver system in a communication system supporting packet-based communicatior (e.g., an IP-network), including a receiver, speech decoder ( 40 ) and a jitter buffer ( 20 ) for handling delay variations in the reception of a speech signal consisting of packets containing frames with encoded speech. A jitter buffer controller ( 50 ) is provided for keeping information about the functional size of the jitter buffer ( 20 ) and for providing the speech decoder ( 40 ) with control information, such that the speech decoder ( 40 ), based on that information. provides a dynamic adaptation of the size of the jitter buffer ( 20 ) using the received encoded, packetized speech signal. The invention also relates to a method of adapting the functional size of the jitter buffer of a receiver system.

公开(公告)号：DE60034493D1

公开(公告)日：2007-05-31

申请号：DE60034493

申请日：2000-02-25

Applicant: ERICSSON TELEFON AB L M

Inventor： WESTBERG LARS ,  SVANBRO KRISTER ,  SUNDQVIST JIM

IPC: H04L1/00 ,  H04L29/06 ,  H04L12/56

Abstract: The soft state of a header compression scheme in a communication system carrying packet traffic including a real time communication signal can be updated (63) during periods of communication signal inactivity (62), during which there is no need to transmit the communication signal. The header compression soft state can also be updated by stealing bits (83, 84) from the communication signal to carry the header update information (73). If the communication signal includes source encoded data, the header compression soft state can be updated selectively (126) based on the bit rate (122, 124) of a codec that produced the source encoded data.

公开(公告)号：AT360321T

公开(公告)日：2007-05-15

申请号：AT05017668

申请日：2000-02-25

Applicant: ERICSSON TELEFON AB L M

Inventor： WESTBERG LARS ,  SVANBRO KRISTER ,  SUNDQVIST JIM

IPC: H04L1/00 ,  H04L12/56 ,  H04L29/06

Abstract: The soft state of a header compression scheme in a communication system carrying packet traffic including a real time communication signal can be updated (63) during periods of communication signal inactivity (62), during which there is no need to transmit the communication signal. The header compression soft state can also be updated by stealing bits (83, 84) from the communication signal to carry the header update information (73). If the communication signal includes source encoded data, the header compression soft state can be updated selectively (126) based on the bit rate (122, 124) of a codec that produced the source encoded data.

公开(公告)号：MY126392A

公开(公告)日：2006-09-29

申请号：MYPI9701655

申请日：1997-04-16

Applicant: ERICSSON TELEFON AB L M

Inventor： EKUDDEN ERIK ,  SUNDQVIST JIM ,  MINDE TOR BJORN ,  HELLWIG KARL

IPC: H04L1/20 ,  H04B7/005 ,  H04L1/00

Abstract: A SOURCE/CHANNEL ENCODING MODE CONTROL METHOD IN A TDMA RADIO COMMUNICATION SYSTEM DETERMINES (20) THE CURRENT TYPE OF SOURCE SIGNAL TO BE ENCODED AND TRANSMITTED, RESTRICTS (22) ENCODING TO A CLASS OF SOURCE/CHANNEL ENCODING MODES COMPATIBLE WITH THE DETERMINED TYPE OF SOURCE SIGNAL, DETERMINES (24) A QUALITY MEASURE FOR PREVIOUSLY TRANSMITTED SIGNALS THAT HAVE BEEN RECEIVED AND DECODED, AND SELECTS (30), BASED ON THE QUALITY MEASURE, THE MOST SUITABLE SOURCE/CHANNEL ENCODING MODE FOR THE DETERMINED CLASS.(FIG. 8)