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公开(公告)号：HK1040807A1
公开(公告)日：2002-06-21
申请号：HK02102211
申请日：2002-03-22
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：HK1040806A1
公开(公告)日：2002-06-21
申请号：HK02102093
申请日：2002-03-19
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：BR9912271A
公开(公告)日：2002-02-13
申请号：BR9912271
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：AU4010801A
公开(公告)日：2001-09-17
申请号：AU4010801
申请日：2001-03-07
Applicant: QUALCOMM INC
Inventor： GRILLI FRANCESCO , JAIN AVINASH , GARDNER WILLIAM
Abstract: A mobile wireless telecommunications system includes base stations of a first type operating according to a first air interface, and base stations of a second type operating according to a second air interface. Methods and apparatus are provided for handing over a mobile station in the system from a first base station, which is of the first type, to a second base station, which is of the second type. A communications link is established over the first air interface between the mobile station and the first base station. Data are received from the mobile station responsive to a signal received by the mobile station over the second air interface from the second base station, substantially without breaking the communications link with the first base station. The mobile station is handed over from the first to the second base station responsive to the data received therefrom. In particular, a method of conducting intersystem handover from a multicarrier system to a direct spread system is provided. Timing synchronization is also advantageously made available through the mobile station.
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Patent Agency Ranking
公开(公告)号：AU2377600A
公开(公告)日：2000-07-12
申请号：AU2377600
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：AU5908399A
公开(公告)日：2000-03-27
申请号：AU5908399
申请日：1999-09-03
Applicant: QUALCOMM INC
Inventor： GARDNER WILLIAM , AGRAWAL AVNEESH , SIH GILBERT 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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公开(公告)号：CA2338083A1
公开(公告)日：2000-01-27
申请号：CA2338083
申请日：1999-07-19
Applicant: QUALCOMM INC
Inventor： NIZRI SHLOMO , KESSLER ILAN , SHIDELMAN DROR , RIMONI YORAM , LEVY ATAI , MENDELSON ASSAF , CASPI DROR , KOLOR SERGIO , VAKULENKO MICHAEL , NEVO RON , BRYGER BOAZ E , GARDNER WILLIAM
Abstract: A mobile wireless telecommunication system includes base stations of a first type operating according to a first air interface, and base stations of a second type operating according to a second air interface. Methods and apparatus are provided for handing over a mobile station in the system from a first base station, which is of the first type, to a second base station, which is of the second type. A communications link is established over the first air interface between the mobile station and the first base station. Data are received from the mobile station responsive to a signal received by the mobile station over the second air interface from the second base statio n, substantially without breaking the communications link with the first base station. The mobile station is handed over from the first to the second base station responsive to the data received therefrom.
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公开(公告)号：WO0167788A3
公开(公告)日：2002-03-14
申请号：PCT/US0107390
申请日：2001-03-07
Applicant: QUALCOMM INC
Inventor： GRILLI FRANCESCO , JAIN AVINASH , GARDNER WILLIAM
Abstract: A mobile wireless telecommunications system includes base stations of a first type operating according to a first air interface, and base stations of a second type operating according to a second air interface. Methods and apparatus are provided for handing over a mobile station in the system from a first base station, which is of the first type, to a second base station, which is of the second type. A communications link is established over the first air interface between the mobile station and the first base station. Data are received from the mobile station responsive to a signal received by the mobile station over the second air interface from the second base station, substantially without breaking the communications link with the first base station. The mobile station is handed over form the first to the second base station responsive to the data received therefrom. In particular, a method of conducting intersystem handover from a multicarrier system to a direct spread system is provided. Timing synchronization is also advantageously made available through the mobile station.
Abstract translation: 移动无线电信系统包括根据第一空中接口操作的第一类型的基站和根据第二空中接口操作的第二类型的基站。 提供了将系统中的移动台从第一类型的第一基站切换到第二类型的第二基站的方法和装置。 在移动台和第一基站之间的第一空中接口建立通信链路。 响应于移动台通过第二空中接口从第二基站接收的信号，从移动台接收数据，基本上不破坏与第一基站的通信链路。 响应于从其接收的数据，移动台从第一基站切换到第二基站。 特别地，提供了从多载波系统到直接扩展系统进行系统间切换的方法。 有利地通过移动台可用定时同步。
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公开(公告)号：WO0004729A2
公开(公告)日：2000-01-27
申请号：PCT/US9916250
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
CPC classification number: H04W36/12 , H04W36/0066 , H04W36/18
Abstract: A mobile wireless telecommunication system includes base stations of a first type operating according to a first air interface, and base stations of a second type operating according to a second air interface. Methods and apparatus are provided for handing over a mobile station in the system from a first base station, which is of the first type, to a second base station, which is of the second type. A communications link is established over the first air interface between the mobile station and the first base station. Data are received from the mobile station responsive to a signal received by the mobile station over the second air interface from the second base station, substantially without breaking the communications link with the first base station. The mobile station is handed over from the first to the second base station responsive to the data received therefrom.
Abstract translation: 移动无线电信系统包括根据第一空中接口操作的第一类型的基站和根据第二空中接口操作的第二类型的基站。 提供了将系统中的移动台从第一类型的第一基站切换到第二类型的第二基站的方法和装置。 在移动台和第一基站之间的第一空中接口建立通信链路。 响应于移动台通过第二空中接口从第二基站接收的信号，从移动台接收数据，基本上不破坏与第一基站的通信链路。 响应于从其接收的数据，移动台从第一基站切换到第二基站。
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