公开(公告)号：CA2286179A1

公开(公告)日：1998-10-22

申请号：CA2286179

申请日：1998-02-18

Applicant: MOTOROLA INC

Inventor： DECLERCK DANIEL J ,  ASHLEY JAMES P

IPC: H04W28/06 ,  H04W36/08 ,  H04B7/216 ,  H04Q7/00

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：CA2093744A1

公开(公告)日：1993-10-14

申请号：CA2093744

申请日：1993-04-08

Applicant: MOTOROLA INC

Inventor： ASHLEY JAMES P ,  NGUYEN QUOC

IPC: H04B3/23 ,  H04B7/015 ,  H04B3/20 ,  H04B3/21

公开(公告)号：CA2542137C

公开(公告)日：2012-06-26

申请号：CA2542137

申请日：2004-10-26

Applicant: MOTOROLA INC

Inventor： MITTAL UDAR ,  ASHLEY JAMES P

IPC: G10L19/00 ,  G10L19/02 ,  G10L21/02 ,  G10L25/90

Abstract: To address the need for choosing values of harmonic noise weighting (HNW) coefficient (.epsilon.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 (.epsilon.p).

公开(公告)号：DE602006012061D1

公开(公告)日：2010-03-18

申请号：DE602006012061

申请日：2006-06-29

Applicant: MOTOROLA INC

Inventor： ASHLEY JAMES P ,  MITTAL UDAR

IPC: G10L25/90

Abstract: In a speech encoder/decoder a pitch delay contour endpoint modifier 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：AU2003291397A1

公开(公告)日：2004-06-03

申请号：AU2003291397

申请日：2003-11-06

Applicant: MOTOROLA INC

Inventor： MITTAL UDAR ,  JASIUK MARK A ,  ASHLEY JAMES P

IPC: G10L19/08 ,  G10L19/04

Abstract: A speech coder that performs analysis-by-synthesis coding of a signal determines gain parameters for each constituent component of multiple constituent components of a synthetic excitation signal. The speech coder generates a target vector based on an input signal. The speech coder further generates multiple constituent components associated with the synthetic excitation signal, wherein one constituent component of the multiple constituent components is based on a shifted version of another constituent component of the multiple constituent components. The speech coder further evaluates an error criteria based on the target vector and the multiple constituent components to determine a gain associated with each constituent component of the multiple constituent components.

公开(公告)号：BR9911627A

公开(公告)日：2001-03-20

申请号：BR9911627

申请日：1999-04-16

Applicant: MOTOROLA INC

Inventor： LOVE ROBERT T ,  ASHLEY JAMES P ,  PROCTOR LEE ,  BAROT ANIL ,  COHEN ARNIE

IPC: H04B7/005 ,  H04J3/16 ,  H04L1/00 ,  H04W52/30 ,  H04J3/22 ,  H04B7/216 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

Abstract: Forward link communication capacity of a communication system, which is providing from a base station to a number of mobile stations a number of forward communication links corresponding to the plurality of mobile stations, is controlled by receiving gain setting associated with at least one of the forward communication links, comparing the gain setting with a gain threshold, and adjusting a first encoding rate of at least one of the forward communication links to a second encoding rate based on the comparing. A gain offset attunes the gain threshold to update the gain threshold according to a latest condition of the communication system. The gain offset further is used to determine blocking of an incoming call to the communication system.

公开(公告)号：BR9807369A

公开(公告)日：2000-03-14

申请号：BR9807369

申请日：1998-01-05

Applicant: MOTOROLA INC

Inventor： ASHLEY JAMES P

IPC: G10L21/02 ,  G10L11/02 ,  G10L19/00 ,  G10L19/14 ,  H04B14/04 ,  H04J3/00 ,  H04L29/08 ,  G10L9/00

Abstract: To accurately determine rate and voice activity in moderate-to-low signal-to-noise ratios (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. Using this method, more of the speech is extracted from the background noise and a lower number of false onsets during fluctuating noise conditions compared with conventional systems are detected. The method is beneficial for voice activity detection (VAD) as well as rate determination (RDA) and unlike other RDA/VAD implementations, is independent of the type of speech coder employed (IS-127, CDG-27, IS-96 and GSM).

公开(公告)号：BR9709148A

公开(公告)日：1999-08-03

申请号：BR9709148

申请日：1997-11-04

Applicant: MOTOROLA INC

Inventor： ASHLEY JAMES P ,  PROCTOR LEE M

IPC: H04M1/60 ,  H04B3/23 ,  H04M9/08 ,  A01B69/00

公开(公告)号：CA2281696A1

公开(公告)日：1998-09-03

申请号：CA2281696

申请日：1998-01-05

Applicant: MOTOROLA INC

Inventor： ASHLEY JAMES P

IPC: G10L21/02 ,  G10L11/02 ,  G10L19/00 ,  G10L19/14 ,  H04B14/04 ,  H04J3/00 ,  H04L29/08 ,  G10L9/00

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).

公开(公告)号：AU689403B2

公开(公告)日：1998-03-26

申请号：AU1758497

申请日：1996-09-04

Applicant: MOTOROLA INC

Inventor： ASHLEY JAMES P

IPC: H04B1/10 ,  G10L21/02 ,  H04B15/00 ,  H04Q7/20

Abstract: A noise suppression system implemented in communication system provides an improved update decision during instances of sudden increase in background noise level. The noise suppression system, inter alia, generates an update by continually monitoring the deviation of spectral energy and forcing an update based on a predetermined threshold criterion. The spectral energy deviation is determined by utilizing an element which has the past values of the power spectral components exponentially weighted. The exponential weighting is a function of the current input energy, which means the higher the input signal energy the longer the exponential window. Conversely, the lower the signal energy the shorter the exponential window. The noise suppression system also inhibits a forced update during periods of continuous, non-stationary input signals (such as "music-on-hold").