-
公开(公告)号：JP2000201087A
公开(公告)日：2000-07-18
申请号：JP32551399
申请日：1999-11-16
Applicant: MOTOROLA INC
Inventor： VINGGAARD NIELS , BATRA ASHISH , ROBERTSON BRETT , CLASSON BRIAN KEITH
Abstract: PROBLEM TO BE SOLVED: To use information related with a discontinuous transmission state by detecting a defective frame when a window error is beyond a defective frame threshold, and changing the defective frame threshold based on whether a receiver is in a continuous transmission mode or a discontinuous transmission mode. SOLUTION: A defective frame threshold is set in a defective frame detector 318 (shown by a figure with a graph in the detector 318). The threshold is varied according to the judgment of whether or not a transceiver is in a discontinuous transmission (DTX) mode. In the case of the discontinuous transmission state, the rate of the defective frame to be reported as a satisfactory frame to be transmitted to a voice decoder can be reduced. A defective frame index is generated in the diagonal line part of the graph in the detector 318. A lenient threshold in the non-discontinuous transmission mode is set so as to be 37. A rigid threshold in the discontinuous transmission mode is set so as to be 65. When the sum (Σlj) of lj is smaller than 100, the frame is detected as a defective frame.
-
公开(公告)号：AU2003281567A1
公开(公告)日：2004-02-09
申请号：AU2003281567
申请日：2003-06-26
Applicant: MOTOROLA INC
Inventor： SARTORI PHILIPPE JEAN-MARC , BAUM KEVIN LYNN , CLASSON BRIAN KEITH
Abstract: In accordance with the preferred embodiment of the present invention, excess power is distributed to certain streams in order to increase the stream's signal quality, and thus, its encoding rate. Although certain streams will have their overall power, and thus their signal quality reduced, in the preferred embodiment of the present invention the reduction in signal quality is limited so that the encoding rate for these streams remains unchanged.
-
公开(公告)号：GB2365291B
公开(公告)日：2002-11-20
申请号：GB0103078
申请日：2001-02-07
Applicant: MOTOROLA INC
Inventor： CLASSON BRIAN KEITH , SCHAFFNER TERRY M , DESAI VIPUL A , BAKER JAMES C , FRIEND DANIEL M
-
公开(公告)号：AU5301401A
公开(公告)日：2001-12-11
申请号：AU5301401
申请日：2001-03-30
Applicant: MOTOROLA INC
Inventor： BAUM KEVIN LYNN , CLASSON BRIAN KEITH , SARTORI PHILIPPE JEAN-MARC , FRY THERESA ANN
-
公开(公告)号：GB2365290B
公开(公告)日：2002-11-20
申请号：GB0103075
申请日：2001-02-07
Applicant: MOTOROLA INC
Inventor： CLASSON BRIAN KEITH , SCHAFFNER TERRY M
Abstract: Decoding signals represented by a trellis of block length N divided into windows of length L includes a step of decoding a forward recursion from a point P that is before the beginning of a window up to the beginning of the window. P is chosen at a sufficient distance from the beginning of the window such that forward recursion determines a known state metric at the beginning of the window. A next step includes decoding the window using forward recursion from the known state at the beginning of the window up to the end of the window to define a set of known forward recursion state metrics which are stored. A next step includes decoding using backward recursion starting from a known state at the end of the window and moving backward. A next step includes calculating a soft output at each stage of the backward recursion using the stored forward recursion state metrics, and branch metrics at each stage, and outputting the soft output for that stage in a LIFO format.
-
Patent Agency Ranking
公开(公告)号：GB2365289B
公开(公告)日：2002-11-13
申请号：GB0102720
申请日：2001-02-05
Applicant: MOTOROLA INC
Inventor： DESAI VIPUL A , CLASSON BRIAN KEITH
Abstract: Optimal decoding of signals represented by a trellis of block length N divided into windows of length L includes a step of decoding a backward recursion from a point N that is at the end of the block back to the end of the window, and storing the determined state metrics at the end of each window. A next step includes decoding the window using backward recursion from the known state at the end of the window back to the beginning of the window to define a set of known backward recursion state metrics which are stored. A next step includes decoding using forward recursion starting from a known state at the beginning of the window and moving forward. A next step includes calculating a soft output at each stage of the forward recursion using the stored backward recursion state metrics, and branch metrics at each state, and outputting the soft output for that stage.
-
公开(公告)号：GB2365290A
公开(公告)日：2002-02-13
申请号：GB0103075
申请日：2001-02-07
Applicant: MOTOROLA INC
Inventor： CLASSON BRIAN KEITH , SCHAFFNER TERRY M
Abstract: Decoding signals represented by a trellis of block length N divided into windows of length L includes a step of decoding a forward recursion from a point P that is before the beginning of a window up to the beginning of the window. P is chosen at a sufficient distance from the beginning of the window such that forward recursion determines a known state metric at the beginning of the window. A next step includes decoding the window using forward recursion from the known state at the beginning of the window up to the end of the window to define a set of known forward recursion state metrics which are stored. A next step includes decoding using backward recursion starting from a known state at the end of the window and moving backward. A next step includes calculating a soft output at each stage of the backward recursion using the stored forward recursion state metrics, and branch metrics at each stage, and outputting the soft output for that stage in a LIFO format.
-
公开(公告)号：GB2365291A
公开(公告)日：2002-02-13
申请号：GB0103078
申请日：2001-02-07
Applicant: MOTOROLA INC
Inventor： CLASSON BRIAN KEITH , SCHAFFNER TERRY M , DESAI VIPUL A , BAKER JAMES C , FRIEND DANIEL M
Abstract: Decoding signals represented by a trellis of block length N divided into windows of length L includes a step of decoding a backward recursion from a point P that is after the end of a window back to the end of the window. P is chosen at a sufficient distance from the end of the window such that backward recursion determines a known state metric at the end of the window. A next step includes decoding the window using backward recursion from the known state at the end of the window back to the beginning of the window to define a set of known backward recursion state metrics which are stored. A next step includes decoding using forward recursion starting from a known state at the beginning of the window and moving forward. A next step includes calculating a soft output at each stage of the forward recursion using the stored backward recursion state metrics, and branch metrics at each stage, and outputting the soft output for that stage.
-
公开(公告)号：GB2345830A
公开(公告)日：2000-07-19
申请号：GB9926071
申请日：1999-11-03
Applicant: MOTOROLA INC
Inventor： VINGGAARD NIELS , BATRA ASHISH , ROBERTSON BRETT , CLASSON BRIAN KEITH
Abstract: A receiver (200) capable of operating in a discontinuous transmit mode includes a soft decision decode (210) producing a soft output and generating window error signals. A window error detector (214) is coupled to the soft decision decoder for detecting a bad frame when the window error exceeds a bad frame threshold, wherein the threshold is altered based on the discontinuous transmit mode. The soft decision decoder may be a turbo decoder which stops iterative processing of the data associated with a window when the window error detector detects that the window does not result in a bad frame indication.
-
公开(公告)号：DE19954256A1
公开(公告)日：2000-05-31
申请号：DE19954256
申请日：1999-11-11
Applicant: MOTOROLA INC
Inventor： VINGGAARD NIELS , BATRA ASHISH , ROBERTSON BRETT , CLASSON BRIAN KEITH
Abstract: The arrangement has a soft decision decoder (210) that produces a soft output and window error signals and a detector (214) coupled to the decoder to detect a bad frame if a window error exceeds a threshold for a bad frame that can be altered based on whether the receiver is in continuous or discontinuous mode.
-
-
-
-
-
-
-
-
-
Search Results
16
records
(took 0.021 seconds)
