公开(公告)号：WO2007027291A1

公开(公告)日：2007-03-08

申请号：PCT/US2006/025629

申请日：2006-06-29

Applicant: MOTOROLA, INC. ,  CRUZ-ZENO, Edgardo, M. ,  ASHLEY, James, P.

Inventor： CRUZ-ZENO, Edgardo, M. ,  ASHLEY, James, P.

IPC: G10L19/00

CPC classification number: G10L19/012 ,  G10L19/005

Abstract: A method that may be used in variety of electronic devices for generating comfort noise includes receiving a plurality of information frames indicative of speech plus background noise, estimating (325) one or more background noise characteristics based on the plurality of information frames, and generating a comfort noise signal (330) based on the one or more background noise characteristics. The method may further include generating a speech signal from the plurality of information frames, and generating an output signal by switching (335) between the comfort noise signal and the speech signal based on a voice activity detection.

Abstract translation: 可以用于各种电子设备中用于产生舒适噪声的方法包括：接收指示语音加背景噪声的多个信息帧，基于多个信息帧估计（325）一个或多个背景噪声特性，以及生成 基于一个或多个背景噪声特性的舒适噪声信号（330）。 该方法还可以包括从多个信息帧生成语音信号，并且通过基于语音活动检测在舒适噪声信号和语音信号之间切换（335）来生成输出信号。

公开(公告)号：WO2005045808A1

公开(公告)日：2005-05-19

申请号：PCT/US2004/035757

申请日：2004-10-26

Applicant: MOTOROLA, INC., A CORPORATION OF THE STATE OF DELAWARE ,  MITTAL, Udar ,  ASHLEY, James, P.

Inventor： MITTAL, Udar ,  ASHLEY, James, P.

IPC: G10L19/00

CPC classification number: G10L21/0364 ,  G10L21/0264

Abstract: To address the need for choosing values of harmonic noise weighting (HNW) coefficient (ε p ) so that the amount of harmonic noise weighting can be optimizex, a method and apparatus for performing harmonic noise weighting in digital spech coders is provided herein. During operation, received speech is analyzed (503) to determine a pitch period. HNW coefficients are then chosen (505) based on the pitch period, and a perceptual noise weighting filter ( C(z) ) is determined (507) based on the harmonic-noise weighting (HNW) coefficients (ε p ).

Abstract translation: 为了解决需要选择谐波噪声加权（HNW）系数（εp）的值，使得谐波噪声加权量可以是优化的，本文提供了一种用于在数字频率编码器中执行谐波噪声加权的方法和装置。 在操作期间，分析接收的语音（503）以确定音调周期。 然后基于音调周期选择（505）HNW系数，并且基于谐波噪声加权（HNW）系数（εp）确定感知噪声加权滤波器（C（z））（507）。

公开(公告)号：WO1998033311A1

公开(公告)日：1998-07-30

申请号：PCT/US1997020079

申请日：1997-11-04

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  ASHLEY, James, P. ,  PROCTOR, Lee, M.

IPC: H04M09/00

CPC classification number: H04M9/082 ,  H04B3/23

Abstract: An improved non-linear processor used in echo cancellation eliminates a comfort noise source (214) and instead inputs a control signal (224) directly into a noise suppression system (403). The noise suppression system (403) uses the control signal (224) to inhibit the iterative update of the background noise estimate when the control signal (224) is active, which prevents any residual echo from biasing the noise estimate provided by the noise suppression system (403). Additionally, the control signal (224) is used by a gain calculator (533) within the noise suppression system (403) to attenuate each frequency band to the maximum allowable amount plus the current residual channel signal-to-noise ratio (SNR). Depending on the implementation, the noise suppression system (403) models the background noise of either a user of the PSTN or a user of a mobile station.

Abstract translation: 用于回波消除的改进的非线性处理器消除了舒适噪声源（214），并且将控制信号（224）直接输入到噪声抑制系统（403）中。 当控制信号（224）有效时，噪声抑制系统（403）使用控制信号（224）来禁止背景噪声估计的迭代更新，这防止任何残留回波偏置由噪声抑制系统提供的噪声估计 （403）。 此外，控制信号（224）由噪声抑制系统（403）内的增益计算器（533）使用，以将每个频带衰减到最大允许量加上当前的残余信道信噪比（SNR）。 根据实现，噪声抑制系统（403）模拟PSTN的用户或移动台的用户的背景噪声。

公开(公告)号：EP1922718A2

公开(公告)日：2008-05-21

申请号：EP06785795.3

申请日：2006-06-29

Applicant: Motorola, Inc.

Inventor： ASHLEY, James, P. ,  MITTAL, Udar

IPC: G10L11/04

CPC classification number: G10L19/09 ,  G10L21/00 ,  G10L21/06

Abstract: In a speech encoder/decoder (200/300) a pitch delay contour endpoint modifier (208) is employed to shift the endpoints of a pitch delay interpolation curve up or down. Particularly, the endpoints of the pitch delay interpolation curve are shifted based on a variation and/or a standard deviation in pitch delay.

公开(公告)号：EP1092294B1

公开(公告)日：2004-05-12

申请号：EP99917565.6

申请日：1999-04-16

Applicant: MOTOROLA, INC.

Inventor： LOVE, Robert, T. ,  ASHLEY, James, P. ,  PROCTOR, Lee ,  BAROT, Anil ,  COHEN, Arnie

IPC: H04L1/00 ,  H04B7/005

CPC classification number: H04L1/0021 ,  H04L1/0009 ,  H04L1/0025 ,  H04W52/30

公开(公告)号：EP1922718B1

公开(公告)日：2010-01-27

申请号：EP06785795.3

申请日：2006-06-29

Applicant: Motorola, Inc.

Inventor： ASHLEY, James, P. ,  MITTAL, Udar

IPC: G10L19/08 ,  G10L11/04

CPC classification number: G10L19/09 ,  G10L21/00 ,  G10L21/06

公开(公告)号：EP1112625A1

公开(公告)日：2001-07-04

申请号：EP99943854.2

申请日：1999-08-24

Applicant: MOTOROLA, INC.

Inventor： ASHLEY, James, P. ,  PENG, Weimin

IPC: H04B7/216

CPC classification number: G10L19/12 ,  H03M7/30

Abstract: To achieve high quality speech reconstruction at low bit rates, constraints on position combinations among two or more pulses (403) are implemented. By placing constraints on position combinations, certain combinations of pulses are prohibited which allows the most significant pulses to always be coded, thereby improving speech quality. After all valid combinations are considered, a list of pulse pairs (codebook) which can be indexed using a single, predetermined bit length codeword is produced. The codeword is transmitted to a destination where it is used by a decoder to reconstruct the original information signal.

公开(公告)号：EP0979506A1

公开(公告)日：2000-02-16

申请号：EP98901181.2

申请日：1998-01-05

Applicant: MOTOROLA, INC.

Inventor： ASHLEY, James, P.

IPC: G10L9/00

CPC classification number: G10L19/18 ,  G10L25/78

Abstract: To accurately determine rate and voice activity in moderate-to-low signal-to-noise ratios (item 703) (SNRs) to maximize voice quality, system capacity and/or battery life, parameters from a noise suppression system are used as inputs to the rate determination function. Voice metrics are compared to thresholds (item 715) and rates are determined (items 721, 727, 730).

Abstract translation: 为了准确地确定在中低信噪比（项目703）（SNR）下的速率和语音活动以最大化语音质量，系统容量和/或电池寿命，来自噪声抑制系统的参数被用作 速率确定功能。 将语音指标与阈值（项目715）进行比较，并确定费率（项目721,727,730）。

公开(公告)号：EP0974206A1

公开(公告)日：2000-01-26

申请号：EP98906535.4

申请日：1998-02-18

Applicant: MOTOROLA, INC.

Inventor： DECLERK, Daniel, J. ,  ASHLEY, James, P.

IPC: H04B7/216 ,  H04Q7/00

CPC classification number: H04W36/0094

Abstract: A mobile station (106) in a code division multiple access (CDMA) communication system (100) implements scanning of pilot channels on a different frequency by reserving a periodic frame on the forward channel to allow the mobile station (106) to change frequencies and scan for other pilot channels. To preserve some aspects of voice quality, both the base station (102) and mobile station (106) voice encode speech at a maximum of half rate and transmit the information as secondary traffic prior to the frame where the mobile station (106) scans the alternate frequency. To maximize the trade-off between voice quality and frequency of the scan, the base station (102) indicates to the mobile station (106) the period between other frequency scans via messaging. To ensure compatibility, this method can be negotiated via known service configuration negotiation techniques.

公开(公告)号：EP0895688B1

公开(公告)日：2006-02-15

申请号：EP97950580.7

申请日：1997-11-04

Applicant: MOTOROLA, INC.

Inventor： ASHLEY, James, P. ,  PROCTOR, Lee, M.

IPC: H04M9/00 ,  H04M11/00 ,  H04B3/20 ,  H04M9/08 ,  H04B3/23

CPC classification number: H04M9/082 ,  H04B3/23

Abstract: An improved non-linear processor used in echo cancellation eliminates a comfort noise source (214) and instead inputs a control signal (224) directly into a noise suppression system (403). The noise suppression system (403) uses the control signal (224) to inhibit the iterative update of the background noise estimate when the control signal (224) is active, which prevents any residual echo from biasing the noise estimate provided by the noise suppression system (403). Additionally, the control signal (224) is used by a gain calculator (533) within the noise suppression system (403) to attenuate each frequency band to the maximum allowable amount plus the current residual channel signal-to-noise ratio (SNR). Depending on the implementation, the noise suppression system (403) models the background noise of either a user of the PSTN or a user of a mobile station.