公开(公告)号：DE69530066D1

公开(公告)日：2003-04-30

申请号：DE69530066

申请日：1995-08-01

Applicant: QUALCOMM INC

Inventor： DEJACO P ,  GARDNER R

IPC: G10L19/24 ,  G10L19/00 ,  G10L19/04 ,  G10L19/14 ,  G10L21/02 ,  G10L25/78 ,  H03M7/30

Abstract: A method of adding hangover frames to a plurality of frames encoded by a vocoder, the method comprising: detecting that a predefined number of successive frames has been encoded at a first rate; determining that a next successive frame should be encoded at a second rate that is less than the first rate; and selecting a number of successive hangover frames beginning with the next successive frame to encode at the first rate, the numbering dependent upon an estimate of a background noise level.

公开(公告)号：DE60024236D1

公开(公告)日：2005-12-29

申请号：DE60024236

申请日：2000-02-08

Applicant: QUALCOMM INC

Inventor： BI NING ,  CHANG CHIENCHUNG ,  DEJACO P

IPC: G10L25/78 ,  G10L11/02 ,  G10L15/04 ,  G10L25/84

Abstract: An apparatus for accurate endpointing of speech in the presence of noise includes a processor and a software module. The processor executes the instructions of the software module to compare an utterance with a first signal-to-noise-ratio (SNR) threshold value to determine a first starting point and a first ending point of the utterance. The processor then compares with a second SNR threshold value a part of the utterance that predates the first starting point to determine a second starting point of the utterance. The processor also then compares with the second SNR threshold value a part of the utterance that postdates the first ending point to determine a second ending point of the utterance. The first and second SNR threshold values are recalculated periodically to reflect changing SNR conditions. The first SNR threshold value advantageously exceeds the second SNR threshold value.

公开(公告)号：DE60011051T2

公开(公告)日：2005-06-02

申请号：DE60011051

申请日：2000-02-14

Applicant: QUALCOMM INC

Inventor： DEJACO P

IPC: G10L19/12 ,  G10L19/14 ,  H03M7/30 ,  H03M7/36 ,  H04B14/04

Abstract: A method and apparatus for CELP-based to CELP-based vocoder packet translation. The apparatus includes a formant parameter translator and an excitation parameter translator. The formant parameter translator includes a model order converter and a time base converter. The method includes the steps of translating the formant filter coefficients of the input packet from the input CELP format to the output CELP format and translating the pitch and codebook parameters of the input speech packet from the input CELP format to the output CELP format. The step of translating the formant filter coefficients includes the steps of converting the model order of the formant filter coefficients from the model order of the input CELP format to the model order of the output CELP format and converting the time base of the resulting coefficients from the input CELP format time base to the output CELP format time base.

公开(公告)号：DE60014583D1

公开(公告)日：2004-11-11

申请号：DE60014583

申请日：2000-02-04

Applicant: QUALCOMM INC

Inventor： DEJACO P ,  WALTERS P ,  GARUDADRI HARINATH

IPC: G10L15/28 ,  G10L15/00 ,  G10L15/06 ,  G10L15/22

Abstract: An apparatus for testing user interface integrity of speech-enabled devices includes a processor and a storage medium coupled to the processor. A set of voiced utterances is stored in the storage medium. A software module is executed by the processor to determine a state of the voice recognizer and provide a response to the voice recognizer in accordance with the determined state. The response may be to produce at least one voiced utterance in accordance with the state. The apparatus may be acoustically coupled to the voice recognizer. The apparatus may also, or in the alternative, be electrically coupled by a cable to the voice recognizer. The set of voiced utterances may include multiple sets of voiced utterances, each set having been spoken by a different person. The set of voiced utterances may also, or in the alternative, include multiple sets of voiced utterances, each set of voiced utterances having been spoken under different background noise conditions. The software module may also be executable to monitor the performance of the voice recognizer.

公开(公告)号：DE69727578D1

公开(公告)日：2004-03-18

申请号：DE69727578

申请日：1997-07-31

Applicant: QUALCOMM INC

Inventor： DEJACO P ,  BI NING

IPC: G10L19/12 ,  G10L20060101 ,  G10L15/02 ,  G10L19/00

Abstract: A method for selecting a code vector in an algebraic codebook wherein the analysis window for the coder is extended beyond the length of the target speech frame. By extending the analysis window, the two dimensional impulse response matrix can be stored as a one dimensional autocorrelation matrix greatly saving on the computational complexity and memory required for the search.

公开(公告)号：DE69429270T2

公开(公告)日：2002-07-25

申请号：DE69429270

申请日：1994-09-08

Applicant: QUALCOMM INC

Inventor： GARDNER R ,  JACOBS E ,  PADOVANI ROBERTO ,  ZIV A ,  LAM KATHERINE ,  DEJACO P

IPC: H04B7/26 ,  H04L1/00 ,  H04L12/00 ,  H04L12/56 ,  H04Q11/04 ,  H04W24/00 ,  H04W28/22 ,  H04L1/12 ,  H04Q7/38

Abstract: A method and apparatus are described for controlling the data rates for communications to and from a base station and a plurality of remote users. The usage of the communications resource whether the forward link resource (from base station to remote users) or reverse link resource (from remote users to base station) is measured. The measured usage value is compared against at least one predetermined threshold value and the data rates of communications or a subset of communications on said communications resource is modified in accordance with said comparisons.

公开(公告)号：DE60032006T2

公开(公告)日：2007-06-21

申请号：DE60032006

申请日：2000-10-26

Applicant: QUALCOMM INC

Inventor： MANJUNATH SHARATH ,  DEJACO P ,  ANANTHAPADMANABHAN K ,  CHOY LUN

IPC: G10L19/04 ,  G10L19/14 ,  G10L19/00 ,  G10L19/12 ,  H03M7/36

Abstract: A method and apparatus for using coding scheme selection patterns in a predictive speech coder to reduce sensitivity to frame error conditions includes a speech coder configured to select from among various predictive coding modes. After a predefined number of speech frames have been predictively coded, the speech coder codes one frame with a nonpredictive coding mode or a mildly predictive coding mode. The predefined number of frames can be determined in advance from the subjective standpoint of a listener. The predefined number of frames may be varied periodically. An average coding bit rate may be maintained for the speech coder by ensuring that an average coding bit rate is maintained for each successive pattern, or group, of predictively coded speech frames including at least one nonpredictively coded or mildly predictively coded speech frame.

公开(公告)号：DE60030997T2

公开(公告)日：2007-06-06

申请号：DE60030997

申请日：2000-07-18

Applicant: QUALCOMM INC

Inventor： MANJUNATH SHARATH ,  DEJACO P ,  ANANTHAPADMANABHAN K ,  HUANG PENGJUN ,  CHOY LUN

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

公开(公告)号：DE60032006D1

公开(公告)日：2007-01-04

申请号：DE60032006

申请日：2000-10-26

Applicant: QUALCOMM INC

Inventor： MANJUNATH SHARATH ,  DEJACO P ,  ANANTHAPADMANABHAN K ,  CHOY LUN

IPC: G10L19/04 ,  G10L19/14 ,  G10L19/00 ,  G10L19/12 ,  H03M7/36

Abstract: A method and apparatus for using coding scheme selection patterns in a predictive speech coder to reduce sensitivity to frame error conditions includes a speech coder configured to select from among various predictive coding modes. After a predefined number of speech frames have been predictively coded, the speech coder codes one frame with a nonpredictive coding mode or a mildly predictive coding mode. The predefined number of frames can be determined in advance from the subjective standpoint of a listener. The predefined number of frames may be varied periodically. An average coding bit rate may be maintained for the speech coder by ensuring that an average coding bit rate is maintained for each successive pattern, or group, of predictively coded speech frames including at least one nonpredictively coded or mildly predictively coded speech frame.

公开(公告)号：DE60024236T2

公开(公告)日：2006-08-17

申请号：DE60024236

申请日：2000-02-08

Applicant: QUALCOMM INC

Inventor： BI NING ,  CHANG CHIENCHUNG ,  DEJACO P

IPC: G10L11/02 ,  G10L25/78 ,  G10L15/04 ,  G10L25/84

Abstract: An apparatus for accurate endpointing of speech in the presence of noise includes a processor and a software module. The processor executes the instructions of the software module to compare an utterance with a first signal-to-noise-ratio (SNR) threshold value to determine a first starting point and a first ending point of the utterance. The processor then compares with a second SNR threshold value a part of the utterance that predates the first starting point to determine a second starting point of the utterance. The processor also then compares with the second SNR threshold value a part of the utterance that postdates the first ending point to determine a second ending point of the utterance. The first and second SNR threshold values are recalculated periodically to reflect changing SNR conditions. The first SNR threshold value advantageously exceeds the second SNR threshold value.