公开(公告)号：DE60221645D1

公开(公告)日：2007-09-20

申请号：DE60221645

申请日：2002-02-06

Applicant: QUALCOMM INC

Inventor： CHOY EDDIE-LUN TIK ,  ANANTHAPADMANABHAN ARASANIPALA ,  DEJACO ANDREW P

IPC: G10L19/14 ,  G01L19/14 ,  G10L19/02

Abstract: A method and apparatus for enhancing coding efficiency by reducing illegal or other undesirable packet generation while encoding a signal, The probability of generating illegal or other undesirable packets while encoding a signal is reduced by first analyzing a history of the frequency of codebook values selected while quantizing speech parameters. Codebook entries are then positioned so that the index/indices that create illegal or other undesirable packets contain the least frequently used entry/entries. Positioning multiple codebooks for various parameters further reduces the probability, that an illegal or other undesirable packet will be created during signal encoding. The method and apparatus may be applied to reduce the probability of generating illegal null traffic channel data packets while encoding eight rate speech.

公开(公告)号：AT341073T

公开(公告)日：2006-10-15

申请号：AT00950431

申请日：2000-07-18

Applicant: QUALCOMM INC

Inventor： MANJUNATH SHARATH ,  DEJACO ANDREW P ,  ANANTHAPADMANABHAN ARASANIPALA ,  HUANG PENGJUN ,  CHOY EDDIE LUN TIK

IPC: G10L19/02 ,  G10L19/00 ,  G10L19/04 ,  G10L19/12 ,  H03M7/36

公开(公告)号：HK1064492A1

公开(公告)日：2005-01-28

申请号：HK04107251

申请日：2004-09-21

Applicant: QUALCOMM INC

Inventor： EL-MALEH KHALED H ,  ANANTHAPADMANABHAN ARASANIPALA ,  DEJACO ANDREW P

IPC: G10L19/012 ,  G10L13/00 ,  H04B14/04 ,  H04J3/00 ,  H04J13/00 ,  G01L ,  H04Q ,  H04J

Abstract: The disclosed embodiments provide a method and apparatus for interoperability between CTX and DTX communications systems during transmissions of silence or background noise. Continuous eight rate encoded noise frames are translated to discontinuous SID frames for transmission to DTX systems (402-410). Discontinuous SID frames are translated to continuous eight rate encoded noise frames for decoding by a CTX system (602-606). Applications of CTX to DTX interoperability comprise CDMA and GSM interoperability (narrowband voice transmission systems), CDMA next generation vocoder (The Selectable Mode Vocoder) interoperability with the new ITU-T 4 kbps vocoder operating in DTX-mode for Voice Over IP applications, future voice transmission systems that have a common speech encoder/decoder but operate in differing CTX or DTX modes during speech non-activity, and CDMA wideband voice transmission system interoperability with other wideband voice transmission systems with common wideband vocoders but with different modes of operation (DTX or CTX) during voice non-activity).

公开(公告)号：HK1062348A1

公开(公告)日：2004-10-29

申请号：HK04105225

申请日：2004-07-16

Applicant: QUALCOMM INC

Inventor： EL-MALEH KHALED H ,  ANANTHAPADMANABHAN ARASANIPALA ,  DEJACO ANDREW P

IPC: G10L13/00 ,  G10L19/14 ,  G10L25/93 ,  H04B20060101

Abstract: Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.

公开(公告)号：BR0012540A

公开(公告)日：2004-06-29

申请号：BR0012540

申请日：2000-07-19

Applicant: QUALCOMM INC

Inventor： ANANTHAPADMANABHAN ARASANIPALA ,  MANJUNATH SHARATH

IPC: G10L19/06 ,  G10L19/00 ,  G10L19/04 ,  H03M7/30

Abstract: A method and apparatus for interleaving line spectral information quantization methods in a speech coder includes quantizing line spectral information with two vector quantization techniques, the first technique being a non-moving-average prediction-based technique, and the second technique being a moving-average prediction-based technique. A line spectral information vector is vector quantized with the first technique. Equivalent moving average codevectors for the first technique are computed. A memory of a moving average codebook of codevectors is updated with the equivalent moving average codevectors for a predefined number of frames that were previously processed by the speech coder. A target quantization vector for the second technique is calculated based on the updated moving average codebook memory. The target quantization vector is vector quantized with the second technique to generate a quantized target codevector. The memory of the moving average codebook is updated with the quantized target codevector. Quantized line spectral information vectors are derived from the quantized target codevector.

公开(公告)号：NO20032496A

公开(公告)日：2003-07-31

申请号：NO20032496

申请日：2003-06-03

Applicant: QUALCOMM INC

Inventor： EL-MALEH KHALED H ,  CHOY EDDIE-LUN TIK ,  ANANTHAPADMANABHAN ARASANIPALA ,  DEJACO ANDREW P ,  HUANG PENGJUN

IPC: H04B7/26 ,  H04L1/00 ,  H04L1/08 ,  H04L29/08 ,  H04L

CPC classification number: H04L1/08 ,  H04L1/0046 ,  H04L1/201

Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.

公开(公告)号：AU2002235512A1

公开(公告)日：2002-08-28

申请号：AU2002235512

申请日：2002-01-30

Applicant: QUALCOMM INC

Inventor： DEJACO ANDREW P ,  EL-MALEH KHALED H ,  ANANTHAPADMANABHAN ARASANIPALA

IPC: G10L19/012 ,  G10L13/00 ,  H04B14/04 ,  H04J3/00 ,  H04J13/00 ,  G10L19/14 ,  H04Q7/30 ,  G10L19/00

Abstract: The disclosed embodiments provide a method and apparatus for interoperability between CTX and DTX communications systems during transmissions of silence or background noise. Continuous eight rate encoded noise frames are translated to discontinuous SID frames for transmission to DTX systems (402-410). Discontinuous SID frames are translated to continuous eight rate encoded noise frames for decoding by a CTX system (602-606). Applications of CTX to DTX interoperability comprise CDMA and GSM interoperability (narrowband voice transmission systems), CDMA next generation vocoder (The Selectable Mode Vocoder) interoperability with the new ITU-T 4 kbps vocoder operating in DTX-mode for Voice Over IP applications, future voice transmission systems that have a common speech encoder/decoder but operate in differing CTX or DTX modes during speech non-activity, and CDMA wideband voice transmission system interoperability with other wideband voice transmission systems with common wideband vocoders but with different modes of operation (DTX or CTX) during voice non-activity).

公开(公告)号：CA2380992A1

公开(公告)日：2001-01-25

申请号：CA2380992

申请日：2000-07-18

Applicant: QUALCOMM INC

Inventor： ANANTHAPADMANABHAN ARASANIPALA ,  DEJACO ANDREW P ,  MANJUNATH SHARATH ,  HUANG PENGJUN ,  CHOY EDDIE LUN TIK

IPC: G10L19/02 ,  G10L19/00 ,  G10L19/04 ,  G10L19/12 ,  H03M7/36

Abstract: A method and apparatus for identifying frequency bands to compute linear pha se shifts between frame prototypes in a speech coder includes partitioning the frequency spectrum of a prototype of a frame by dividing the frequency spectrum into segments, assigning one or more bands to each segment, and establishing, for each segment, a set of bandwidths for the bands. The bandwidths may be fixed and uniformly distributed in any given segment. The bandwidths may be fixed and non-uniformly distributed in any segment. The bandwidths may be variable and non-uniformly distributed in any given segmen t.

公开(公告)号：AU2002219914B2

公开(公告)日：2006-11-16

申请号：AU2002219914

申请日：2001-11-29

Applicant: QUALCOMM INC

Inventor： CHOY EDDIE-LUN TIK ,  HUANG PENGJUN ,  DEJACO ANDREW P ,  EL-MALEH KHALED H ,  ANANTHAPADMANABHAN ARASANIPALA

IPC: H04L1/00 ,  H04B7/26 ,  H04L1/08 ,  H04L29/08

Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.

公开(公告)号：AT322068T

公开(公告)日：2006-04-15

申请号：AT00950441

申请日：2000-07-19

Applicant: QUALCOMM INC

Inventor： ANANTHAPADMANABHAN ARASANIPALA ,  MANJUNATH SHARATH

IPC: G10L19/06 ,  G10L19/00 ,  G10L19/04 ,  H03M7/30

Abstract: A method and apparatus for interleaving line spectral information quantization methods in a speech coder includes quantizing line spectral information with two vector quantization techniques, the first technique being a non-moving-average prediction-based technique, and the second technique being a moving-average prediction-based technique. A line spectral information vector is vector quantized with the first technique. Equivalent moving average codevectors for the first technique are computed. A memory of a moving average codebook of codevectors is updated with the equivalent moving average codevectors for a predefined number of frames that were previously processed by the speech coder. A target quantization vector for the second technique is calculated based on the updated moving average codebook memory. The target quantization vector is vector quantized with the second technique to generate a quantized target codevector. The memory of the moving average codebook is updated with the quantized target codevector. Quantized line spectral information vectors are derived from the quantized target codevector.