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公开(公告)号：AT424023T
公开(公告)日：2009-03-15
申请号：AT99967507
申请日：1999-12-21
Applicant: QUALCOMM INC
Inventor： MANJUNATH SHARATH , GARDNER WILLIAM
Abstract: A method and apparatus for the variable rate coding of a speech signal. An input speech signal is classified and an appropriate coding mode is selected based on this classification. For each classification, the coding mode that achieves the lowest bit rate with an acceptable quality of speech reproduction is selected. Low average bit rates arc achieved by only employing high fidelity modes (i.e., high bit rate, broadly applicable to different types of speech) during portions of the speech where this fidelity is required for acceptable output. Lower bit rate modes are used during portions of speech where these modes produce acceptable output. Input speech signal is classified into active and inactive regions. Active regions are further classified into voiced, unvoiced, and transient regions. Various coding modes are applied to active speech, depending upon the required level of fidelity. Coding modes may be utilized according to the strengths and weaknesses of each particular mode. The apparatus dynamically switches between these modes as the properties of the speech signal vary with time. And where appropriate, regions of speech arc modeled as pseudo-random noise, resulting in a significantly lower bit rate. This coding is used in a dynamic fashion whenever unvoiced speech or background noise is detected.
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公开(公告)号：DE69935859T2
公开(公告)日：2007-12-13
申请号：DE69935859
申请日：1999-07-19
Applicant: QUALCOMM INC
Inventor： NEVO RON , VAKULENKO MICHAEL , BRYGER BOAZ E , GARDNER WILLIAM , CASPI DROR , MENDELSON ASSAF , KOLOR SERGIO , NIZRI SHLOMO , KESSLER ILAN , LEVY ATAI , SHIDELMAN DROR , RIMONI YORAM
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公开(公告)号：CA2343218C
公开(公告)日：2006-01-03
申请号：CA2343218
申请日：1999-09-03
Applicant: QUALCOMM INC
Inventor： AGRAWAL AVNEESH , GARDNER WILLIAM , ZOU QIUZHEN , SIH GILBERT C , KANG INYUP
IPC: G01S19/30 , G01S1/00 , G01S1/04 , G01S5/00 , G01S5/14 , G01S19/23 , G01S19/24 , G01S19/25 , G01S19/29 , G01S19/37 , H04Q7/32 , H04Q7/34 , H04Q7/36 , H04Q7/38
Abstract: The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment comprises a method for performing position location i n a wireless communication system using a set of signals transmitted from a set of satellites including the steps of receiving signal samples, rotating an acquisition code by a first rotation amount yielding a rotated acquisition code, despreading said signal samples using rotated acquisition code yielding despread data, accumulating said despread data over a first duration yielding partially accumulated data , rotating said partially accumulated data by a second rotation amount yielding rotated data and accumulating said rotated data.
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公开(公告)号：DE69928288D1
公开(公告)日：2005-12-15
申请号：DE69928288
申请日：1999-12-21
Applicant: QUALCOMM INC
Inventor： MANJUNATH SHARATH , GARDNER WILLIAM
Abstract: A method and apparatus for coding a quasi-periodic speech signal. The speech signal is represented by a residual signal generated by filtering the speech signal with a Linear Predictive Coding (LPC) analysis filter. The residual signal is encoded by extracting a prototype period from a current frame of the residual signal. A first set of parameters is calculated which describes how to modify a previous prototype period to approximate the current prototype period. One or more codevectors are selected which, when summed, approximate the error between the current prototype period and the modified previous prototype. A multi-stage codebook is used to encode this error signal. A second set of parameters describe these selected codevectors. The decoder synthesizes an output speech signal by reconstructing a current prototype period based on the first and second set of parameters, and the previous reconstructed prototype period. The residual signal is then interpolated over the region between the current and previous reconstructed prototype periods. The decoder synthesizes output speech based on the interpolated residual signal.
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公开(公告)号：AU769854B2
公开(公告)日：2004-02-05
申请号：AU5111499
申请日：1999-07-19
Applicant: QUALCOMM INC
Inventor： NEVO RON , VAKULENKO MICHAEL , BRYGER BOAZ E , GARDNER WILLIAM , CASPI DROR , MENDELSON ASSAF , KOLOR SERGIO , NIZRI SHLOMO , KESSLER ILAN , LEVY ATAI , SHIDELMAN DROR , RIMONI YORAM
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Patent Agency Ranking
公开(公告)号：MXPA02008721A
公开(公告)日：2003-04-14
申请号：MXPA02008721
申请日：2001-03-07
Applicant: QUALCOMM INC
Inventor： GARDNER WILLIAM
Abstract: Un sistema de telecomunicaciones inalambricas moviles que incluye estaciones base de un primer tipo que operan de acuerdo con una primera interfase aerea, y estaciones base de un segundo tipo que operan de acuerdo con una segunda interfase aerea. Se proporcionan metodos y aparatos para transmitir a una estacion movil en el sistema desde una primera estacion base, la cual es del primer tipo, a una segunda estacion base, la cual es del segundo tipo. El enlace de comunicaciones es establecido por la primera interfase aerea entre la estacion movil, y la primera estacion base. Los datos recibidos de la estacion movil en respuesta a la senal recibida por la estacion movil, por la segunda interfase aerea desde la segunda estacion base, sin romper substancialmente el enlace de comunicacion con la primera estacion base. La estacion movil es transmitida de la primera a la segunda estacion base en respuesta a los datos recibidos de la misma. En particular, se proporciona un metodo para conducir la transmision intersistema para un sistema transmisor multiple a un sistema disperso directo. La sincronizacion de tiempo tambien se hace disponible de una manera ventajosa a traves de la estacion movil.
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公开(公告)号：MXPA01000672A
公开(公告)日：2002-07-22
申请号：MXPA01000672
申请日：1999-07-19
Applicant: QUALCOMM INC
Inventor： GARDNER WILLIAM
Abstract: Un sistema movil de telecomunicaciones inalambricas incluye estaciones base de un primer tipo que operan de acuerdo con una primera interfaz aerea, y estaciones base de un segundo tipo que operan de acuerdo con una segunda interfaz aerea. Se proporcionan metodos y aparatos para transferir una estacion movil en el sistema desde una primera estacion base, que es del primer tipo, a una segunda estacion base, que es del segundo tipo. Se establece un enlace de comunicaciones sobre la primera interfaz aerea entre la estacion movil y la primera estacion base. Se reciben datos de la estacion movil en respuesta a una senal recibida por la estacion movil sobre la segunda interfaz desde la segunda estacion base, sin romper sustancialmente el enlace de comunicaciones con la primera estacion base. La estacion movil se transfiere desde la primera a la segunda estacion base en respuesta a los datos recibidos de la misma.
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公开(公告)号：AU2377500A
公开(公告)日：2000-07-12
申请号：AU2377500
申请日：1999-12-21
Applicant: QUALCOMM INC
Inventor： MANJUNATH SHARATH , GARDNER WILLIAM
Abstract: A method and apparatus for the variable rate coding of a speech signal. An input speech signal is classified and an appropriate coding mode is selected based on this classification. For each classification, the coding mode that achieves the lowest bit rate with an acceptable quality of speech reproduction is selected. Low average bit rates arc achieved by only employing high fidelity modes (i.e., high bit rate, broadly applicable to different types of speech) during portions of the speech where this fidelity is required for acceptable output. Lower bit rate modes are used during portions of speech where these modes produce acceptable output. Input speech signal is classified into active and inactive regions. Active regions are further classified into voiced, unvoiced, and transient regions. Various coding modes are applied to active speech, depending upon the required level of fidelity. Coding modes may be utilized according to the strengths and weaknesses of each particular mode. The apparatus dynamically switches between these modes as the properties of the speech signal vary with time. And where appropriate, regions of speech arc modeled as pseudo-random noise, resulting in a significantly lower bit rate. This coding is used in a dynamic fashion whenever unvoiced speech or background noise is detected.
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公开(公告)号：AT309601T
公开(公告)日：2005-11-15
申请号：AT99967508
申请日：1999-12-21
Applicant: QUALCOMM INC
Inventor： MANJUNATH SHARATH , GARDNER WILLIAM
Abstract: A method and apparatus for coding a quasi-periodic speech signal. The speech signal is represented by a residual signal generated by filtering the speech signal with a Linear Predictive Coding (LPC) analysis filter. The residual signal is encoded by extracting a prototype period from a current frame of the residual signal. A first set of parameters is calculated which describes how to modify a previous prototype period to approximate the current prototype period. One or more codevectors are selected which, when summed, approximate the error between the current prototype period and the modified previous prototype. A multi-stage codebook is used to encode this error signal. A second set of parameters describe these selected codevectors. The decoder synthesizes an output speech signal by reconstructing a current prototype period based on the first and second set of parameters, and the previous reconstructed prototype period. The residual signal is then interpolated over the region between the current and previous reconstructed prototype periods. The decoder synthesizes output speech based on the interpolated residual signal.
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公开(公告)号：DE69904957T2
公开(公告)日：2004-01-08
申请号：DE69904957
申请日：1999-09-03
Applicant: QUALCOMM INC
Inventor： GARDNER WILLIAM , AGRAWAL AVNEESH , SIH C , ZOU QIUZHEN , KANG INYUP
IPC: G01S19/30 , G01S1/00 , G01S5/00 , G01S5/14 , G01S19/23 , G01S19/24 , G01S19/25 , G01S19/29 , G01S19/37 , H04Q7/34 , H04Q7/38 , G01S1/04
Abstract: The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment comprises a method for performing position location in a wireless communication system using a set of signals transmitted from a set of satellites including the steps of receiving signal samples, rotating an acquisition code by a first rotation amount yielding a rotated acquisition code, despreading said signal samples using rotated acquisition code yielding despread data, accumulating said despread data over a first duration yielding partially accumulated data, rotating said partially accumulated data by a second rotation amount yielding rotated data and accumulating said rotated data.
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