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公开(公告)号：ES2276690T3
公开(公告)日：2007-07-01
申请号：ES00950431
申请日：2000-07-18
Applicant: QUALCOMM INC
Inventor： MANJUNATH SHARATH , DEJACO ANDREW P , ANANTHAPADMANABHAN ARASANIPALA , HUANG PENGJUN , CHOY EDDIE LUN TIK
Abstract: Un método de segmentación del espectro de frecuencia de un prototipo de un marco, el método comprende: Dividir (604) el espectro de frecuencia en una pluralidad de segmentos; Asignar (606) una pluralidad de bandas de frecuencia a cada segmento; y Establecer, para cada segmento, un conjunto de anchos de banda para la pluralidad de bandas de la frecuencia fundamental; Seleccionar (610) cuándo establecer el conjunto de anchos de banda mediante: Asignar (614) anchos de banda fijos uniformes para todas las bandas en un segmento particular; o Asignar (624) anchos de banda fijos no uniformes para la pluralidad de bandas en un segmento particular; o Asignar (626 a 640) anchos de banda variable a la pluralidad de bandas en un segmento particular; y Asignar los anchos de banda de conformidad con la selección, En donde, si el conjunto de anchos de banda es establecido mediante asignar anchos de banda variable (626 a 640) a la pluralidad de bandas en un segmento particular, entonces asignar comprende:Establecer (626) un ancho de banda objetivo; Buscar (628 a 632), para cada banda, un vector de amplitud del prototipo para determinar el número armónico máximo de la frecuencia fundamental en la banda, excluyendo de la búsqueda los rangos cubiertos por cualquier borde de banda previamente establecido; y Posicionar (634), para cada banda, los bordes de banda alrededor del número armónico máximo de modo que el número total de armónicos de la frecuencia fundamental localizada entre los bordes de banda sea igual al ancho de banda objetivo dividido por la frecuencia fundamental.
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公开(公告)号：ES2264420T3
公开(公告)日：2007-01-01
申请号：ES00950441
申请日：2000-07-19
Applicant: QUALCOMM INC
Inventor： ANANTHAPADMANABHAN ARASANIPALA , MANJUNATH SHARATH
Abstract: Un codificador de voz (200) que comprende: un filtro predictivo lineal (206) configurado para analizar un marco y generar un vector de codificación de información espectral de línea basado en esto; y un discretizador (210) acoplado al filtro predictivo lineal y configurado para discretizar vectorialmente (504) el vector de información espectral de línea con una primera técnica de discretización vectorial que usa un esquema de discretización vectorial basada en predicciones de media no móvil, en donde el discretizador (210) es además configurado para calcular (510) vectores de codificación de media móvil equivalentes para la primera técnica, actualizar (512) con los vectores de codificación de media móvil equivalentes una memoria de un código cifrado de media móvil de vectores de codificación para un número predefinido de marcos que fueron previamente procesados por el codificador de voz, calcular (502) un vector de discretización objetivo para la segunda técnica basado en la memoria actualizada de código cifrado de media móvil, discretizar vectorialmente (506) el vector de discretización objetivo con una segunda técnica de discretización vectorial para generar un vector de codificación objetivo discretizado, la segunda técnica de discretización vectorial que usa un esquema basado en predicciones de media móvil, actualizar (512) la memoria del código cifrado de media móvil con el vector de codificación objetivo discretizado, y calcular (508) vectores de información espectral de línea discretizados del vector de codificación objetivo discretizado.
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公开(公告)号：BR0207182A
公开(公告)日：2006-01-17
申请号：BR0207182
申请日：2002-02-06
Applicant: QUALCOMM INC
Inventor： CHOY EDDIE-LUN TIK , ANANTHAPADMANABHAN ARASANIPALA , DEJACO ANDREW P
Abstract: A method and apparatus for enhancing coding efficiency by reducing illegal or other undesirable packet generation while encoding a signal, The probability of generating illegal or other undesirable packets while encoding a signal is reduced by first analyzing a history of the frequency of codebook values selected while quantizing speech parameters. Codebook entries are then positioned so that the index/indices that create illegal or other undesirable packets contain the least frequently used entry/entries. Positioning multiple codebooks for various parameters further reduces the probability, that an illegal or other undesirable packet will be created during signal encoding. The method and apparatus may be applied to reduce the probability of generating illegal null traffic channel data packets while encoding eight rate speech.
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44.发明专利
公开(公告)号：MXPA05004447A
公开(公告)日：2005-07-26
申请号：MXPA05004447
申请日：2003-10-28
Applicant: QUALCOMM INC
Inventor： ANANTHAPADMANABHAN ARASANIPALA
Abstract: Se presentan metodos y aparatos para brindar soporte a la transmision de cuadros de vocodificador de velocidad variable a traves de canales de comunicacion no compatibles. Los cuadros de vocodificador de velocidad variable se vuelven a formatear como carga en cuadros de vocodificador de velocidad variable. En el receptor, se efectua una determinacion respecto a si el cuadro de vocodificador de velocidad variable recibido porta o no una carga de cuadro de vocodificador de velocidad variable. Si un cuadro de vocodificador de velocidad variable es carga, entonces se hace una determinacion del tipo de cuadro. Se presentan diversas modalidades para transportar informacion de carga.
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公开(公告)号：NO20032496L
公开(公告)日：2003-07-31
申请号：NO20032496
申请日：2003-06-03
Applicant: QUALCOMM INC
Inventor： EL-MALEH KHALED H , CHOY EDDIE-LUN TIK , ANANTHAPADMANABHAN ARASANIPALA , DEJACO ANDREW P , HUANG PENGJUN
Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.
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Patent Agency Ranking
公开(公告)号：NO20032496D0
公开(公告)日：2003-06-03
申请号：NO20032496
申请日：2003-06-03
Applicant: QUALCOMM INC
Inventor： EL-MALEH KHALED H , CHOY EDDIE-LUN TIK , ANANTHAPADMANABHAN ARASANIPALA , DEJACO ANDREW P , HUANG PENGJUN
Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.
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公开(公告)号：AU2002240028A1
公开(公告)日：2002-08-06
申请号：AU2002240028
申请日：2002-01-23
Applicant: QUALCOMM INC
Inventor： EL-MALEH KHALED H , ANANTHAPADMANABHAN ARASANIPALA , DEJACO ANDREW P
Abstract: Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.
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公开(公告)号：AU1991402A
公开(公告)日：2002-06-18
申请号：AU1991402
申请日：2001-11-29
Applicant: QUALCOMM INC
Inventor： EL-MALEH KHALED H , CHOY EDDIE-LUN TIK , ANANTHAPADMANABHAN ARASANIPALA , DEJACO ANDREW P , HUANG PENGJUN
Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.
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49.发明专利
公开(公告)号：AU1576001A
公开(公告)日：2001-05-08
申请号：AU1576001
申请日：2000-10-26
Applicant: QUALCOMM INC
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.
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50.发明专利
公开(公告)号：AU6354600A
公开(公告)日：2001-02-05
申请号：AU6354600
申请日：2000-07-19
Applicant: QUALCOMM INC
Inventor： ANANTHAPADMANABHAN ARASANIPALA , MANJUNATH SHARATH
Abstract: A method and apparatus for interleaving line spectral information quantization methods in a speech coder includes quantizing line spectral information with two vector quantization techniques, the first technique being a non-moving-average prediction-based technique, and the second technique being a moving-average prediction-based technique. A line spectral information vector is vector quantized with the first technique. Equivalent moving average codevectors for the first technique are computed. A memory of a moving average codebook of codevectors is updated with the equivalent moving average codevectors for a predefined number of frames that were previously processed by the speech coder. A target quantization vector for the second technique is calculated based on the updated moving average codebook memory. The target quantization vector is vector quantized with the second technique to generate a quantized target codevector. The memory of the moving average codebook is updated with the quantized target codevector. Quantized line spectral information vectors are derived from the quantized target codevector.
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