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公开(公告)号：ES2240121T3
公开(公告)日：2005-10-16
申请号：ES00947533
申请日：2000-07-19
Applicant: QUALCOMM INC
Inventor： MANJUNATH SHARATH , DEJACO ANDREW P
Abstract: Procedimiento para mantener una cadencia media de bits determinada para un codificador de voz (100, 106, 200, 500), codificador (100, 106, 200, 500) que está configurado para codificar una serie de fotogramas de diversas cadencias codificadoras, procedimiento que comprende: la codificación (400 a 416) de un fotograma a un ritmo de codificación preseleccionado; el cálculo(600) de una cadencia media de bits en servicio para un número predefinido de fotogramas codificados; la sustracción(602) de la cadencia media de bits en servicio de una cadencia media de bits determinada para obtener un valor diferencial; la división (602) del valor diferencial por el tipo de codificación preseleccionada para obtener un valor cociente.
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公开(公告)号：DE60017763D1
公开(公告)日：2005-03-03
申请号：DE60017763
申请日：2000-07-19
Applicant: QUALCOMM INC
Inventor： MANJUNATH SHARATH , DEJACO P
Abstract: A method and apparatus for maintaining a target bit rate in a speech coder includes a speech coder for encoding a frame at a preselected encoding rate, computing a running average bit rate for a predefined number of encoded frames, subtracting the running average bit rate from a predefined target average bit rate, and dividing the difference by the preselected encoding rate. If the quotient value is negative, a predefined number of possible occurrence counts of speech coder performance threshold values that are less than a current performance threshold value is accumulated, the accumulated number being greater than the absolute value of the quotient. The product of a decrement-per-occurrence-count-value and the predefined number of occurrence counts is subtracted from the current performance threshold value to obtain a new performance threshold value. If the quotient value is positive, a predefined number of possible occurrence counts of speech coder performance threshold values that are greater than the current performance threshold value is accumulated, the accumulated number being greater than the quotient. The product of an increment-per-occurrence-count-value and the predefined number of occurrence counts is added to the current performance threshold value to obtain a new performance.
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公开(公告)号：AU2003293438A1
公开(公告)日：2004-06-30
申请号：AU2003293438
申请日：2003-12-04
Applicant: QUALCOMM INC
Abstract: Techniques are presented herein to provide tandem-free operation between two wireless terminals through two otherwise incompatible wireless networks. Specifically, embodiments provide tandem-free operation between a wireless terminal communicating through a continuous transmission (CTX) wireless channel to a wireless terminal communicating through a discontinuous transmission (DTX) wireless channel. In a first aspect, inactive speech frames are translated between DTX and CTX formats. In a second aspect, each wireless terminal includes an active speech decoder that is compatible with the active speech encoder on the opposite end of the mobile-to-mobile connection.
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公开(公告)号：CA2494956A1
公开(公告)日：2004-02-19
申请号：CA2494956
申请日：2003-08-08
Applicant: QUALCOMM INC
Abstract: Methods and apparatus are presented for determining the type of acoustic signal and the type of frequency spectrum exhibited by the acoustic signal i n order to selectively delete parameter information before vector quantization . (430) The bits that would otherwise be allocated to the deleted parameters c an then be re-allocated to the quantization of the remaining parameters, which results in an improvement of the perceptual quality of the synthesized acoustic signal. (450) Alternatively, the bits that would have been allocate d to the deleted parameters are dropped, resulting in an overall bit-rate reduction (440).
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85.发明专利
公开(公告)号：HK1055174A1
公开(公告)日：2003-12-24
申请号：HK03107440
申请日：2003-10-15
Applicant: QUALCOMM INC
Inventor： MANJUNATH SHARATH , HUANG PENJUNG , CHOY EDDIE-LUN TIK
Abstract: A frame erasure compensation method in a variable-rate speech coder includes quantizing, with a first encoder, a pitch lag value for a current frame and a first delta pitch lag value equal to the difference between the pitch lag value for the current frame and the pitch lag value for the previous frame. A second, predictive encoder quantizes only a second delta pitch lag value for the previous frame (equal to the difference between the pitch lag value for the previous frame and the pitch lag value for the frame prior to that frame). If the frame prior to the previous frame is processed as a frame erasure, the pitch lag value for the previous frame is obtained by subtracting the first delta pitch lag value from the pitch lag value for the current frame. The pitch lag value for the erasure frame is then obtained by subtracting the second delta pitch lag value from the pitch lag value for the previous frame. Additionally, a waveform interpolation method may be used to smooth discontinuities caused by changes in the coder pitch memory.
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Patent Agency Ranking
公开(公告)号：DE69621620T2
公开(公告)日：2003-02-06
申请号：DE69621620
申请日：1996-08-01
Applicant: QUALCOMM INC
Inventor： GARDNER R , MANJUNATH SHARATH , MONTA PETER
Abstract: A novel and improved method and apparatus for encoding line predictive coding (LPC) data in a speech compression system using line spectral square root values is disclosed. A novel and computationally efficient procedure for determining the set of quantization sensitivities for the line spectral square root values is disclosed, which results in a computationally efficient error measure for use in vector quantization of the line spectral square root values. A novel method of weighting the quantization error is disclosed, which accumulates the quantization error in each line spectral square root value and weights that error by the sensitivity of that line spectral square root value.\!
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公开(公告)号：HK1044614A1
公开(公告)日：2002-10-25
申请号：HK02106115
申请日：2002-08-21
Applicant: QUALCOMM INC
Inventor： DAS AMITAVA , MANJUNATH SHARATH
Abstract: A multipulse interpolative coder for transition speech frames includes an extractor configured to represent a first frame of transitional speech samples by a subset of the samples of the frame. The coder also includes an interpolator configured to interpolate the subset of samples and a subset of samples extracted from an earlier-received frame to synthesize other samples of the first frame that are not included in the subset. The subset of samples is further simplified by selecting a set of pulses from the subset and assigning zero values to unselected pulses. In the alternative, a portion of the unselected pulses may be quantized. The set of pulses may be the pulses having the greatest absolute amplitudes in the subset. In the alternative, the set of pulses may be the most perceptually significant pulses of the subset.
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公开(公告)号：AU5710201A
公开(公告)日：2001-11-07
申请号：AU5710201
申请日：2001-04-18
Applicant: QUALCOMM INC
Inventor： MANJUNATH SHARATH , HUANG PENJUNG , CHOY EDDIE-LUN TIK
Abstract: A frame erasure compensation method in a variable-rate speech coder includes quantizing, with a first encoder, a pitch lag value for a current frame and a first delta pitch lag value equal to the difference between the pitch lag value for the current frame and the pitch lag value for the previous frame. A second, predictive encoder quantizes only a second delta pitch lag value for the previous frame (equal to the difference between the pitch lag value for the previous frame and the pitch lag value for the frame prior to that frame). If the frame prior to the previous frame is processed as a frame erasure, the pitch lag value for the previous frame is obtained by subtracting the first delta pitch lag value from the pitch lag value for the current frame. The pitch lag value for the erasure frame is then obtained by subtracting the second delta pitch lag value from the pitch lag value for the previous frame. Additionally, a waveform interpolation method may be used to smooth discontinuities caused by changes in the coder pitch memory.
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公开(公告)号：AU5375201A
公开(公告)日：2001-11-07
申请号：AU5375201
申请日：2001-04-20
Applicant: QUALCOMM INC
Inventor： ANANTHAPADMANABHAN ARASANIPALA , MANJUNATH SHARATH , HUANG PENGJUN , CHOY EDDIE-LUN TIK , DEJACO ANDREW P
Abstract: 13. A computer-readable medium comprising instructions that upon execution in a processor cause the processor to perform the methods as recited in any of claims 5 to 8.
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公开(公告)号：AU6353700A
公开(公告)日：2001-02-05
申请号：AU6353700
申请日：2000-07-18
Applicant: QUALCOMM INC
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